http://marc.info/?l=user-mode-linux-user&m=120223044125132&q=raw
diff --git a/arch/um/include/as-layout.h b/arch/um/include/as-layout.h
index a5cdf95..90ee798 100644
--- a/arch/um/include/as-layout.h
+++ b/arch/um/include/as-layout.h
@@ -17,6 +17,7 @@
#define ASM_STUB_CODE (UML_CONFIG_TOP_ADDR - 2 * UM_KERN_PAGE_SIZE)
#define ASM_STUB_DATA (UML_CONFIG_TOP_ADDR - UM_KERN_PAGE_SIZE)
#define ASM_STUB_START ASM_STUB_CODE
+#define ASM_STUB_END UML_CONFIG_TOP_ADDR
/*
* This file is included by the assembly stubs, which just want the
@@ -27,6 +28,7 @@
#define STUB_CODE ((unsigned long) ASM_STUB_CODE)
#define STUB_DATA ((unsigned long) ASM_STUB_DATA)
#define STUB_START ((unsigned long) ASM_STUB_START)
+#define STUB_END ((unsigned long) ASM_STUB_END)
#include "sysdep/ptrace.h"
diff --git a/arch/um/include/os.h b/arch/um/include/os.h
index 6f0d1c7..f1c26f5 100644
--- a/arch/um/include/os.h
+++ b/arch/um/include/os.h
@@ -168,7 +168,7 @@ extern int os_fchange_dir(int fd);
/* start_up.c */
extern void os_early_checks(void);
-extern int can_do_skas(void);
+extern void can_do_skas(void);
extern void os_check_bugs(void);
extern void check_host_supports_tls(int *supports_tls, int *tls_min);
diff --git a/arch/um/include/siginfo_segv.h b/arch/um/include/siginfo_segv.h
new file mode 100644
index 0000000..c000267
--- /dev/null
+++ b/arch/um/include/siginfo_segv.h
@@ -0,0 +1,133 @@
+/*
+ * Copyright (C) 2002- 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SIGINFO_SIGSEGV_H_
+#define __SIGINFO_SIGSEGV_H_
+
+/*
+ * Provide signal.h, except for replacing siginfo_t with one that has
+ * the CPU trap number and error code in the SIGSEGV case.
+ */
+
+#include <time.h>
+
+/* Rename the signal.h siginfo and siginfo_t out of the way */
+#define siginfo old_siginfo
+#define siginfo_t old_siginfo_t
+
+#include <signal.h>
+
+#undef siginfo
+#undef siginfo_t
+
+#define __ARCH_SI_TRAPNO
+#define __ARCH_SI_ERROR
+
+/* The new siginfo_t, plus associated definitions */
+
+/*
+ * This is the size (including padding) of the part of the
+ * struct siginfo that is before the union.
+ */
+#ifndef __ARCH_SI_PREAMBLE_SIZE
+#define __ARCH_SI_PREAMBLE_SIZE (3 * sizeof(int))
+#endif
+
+#define SI_MAX_SIZE 128
+#ifndef SI_PAD_SIZE
+#define SI_PAD_SIZE ((SI_MAX_SIZE - __ARCH_SI_PREAMBLE_SIZE) / sizeof(int))
+#endif
+
+#ifndef __ARCH_SI_UID_T
+#define __ARCH_SI_UID_T uid_t
+#endif
+
+/*
+ * The default "si_band" type is "long", as specified by POSIX.
+ * However, some architectures want to override this to "int"
+ * for historical compatibility reasons, so we allow that.
+ */
+#ifndef __ARCH_SI_BAND_T
+#define __ARCH_SI_BAND_T long
+#endif
+
+#define __user
+
+typedef struct siginfo {
+ int si_signo;
+ int si_errno;
+ int si_code;
+
+ union {
+ int _pad[SI_PAD_SIZE];
+
+ /* kill() */
+ struct {
+ pid_t _pid; /* sender's pid */
+ __ARCH_SI_UID_T _uid; /* sender's uid */
+ } _kill;
+
+ /* POSIX.1b timers */
+ struct {
+ timer_t _tid; /* timer id */
+ int _overrun; /* overrun count */
+ char _pad[sizeof( __ARCH_SI_UID_T) - sizeof(int)];
+ sigval_t _sigval; /* same as below */
+ int _sys_private; /* not to be passed to user */
+ } _timer;
+
+ /* POSIX.1b signals */
+ struct {
+ pid_t _pid; /* sender's pid */
+ __ARCH_SI_UID_T _uid; /* sender's uid */
+ sigval_t _sigval;
+ } _rt;
+
+ /* SIGCHLD */
+ struct {
+ pid_t _pid; /* which child */
+ __ARCH_SI_UID_T _uid; /* sender's uid */
+ int _status; /* exit code */
+ clock_t _utime;
+ clock_t _stime;
+ } _sigchld;
+
+ /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
+ struct {
+ void __user *_addr; /* faulting insn/memory ref. */
+#ifdef __ARCH_SI_TRAPNO
+ int _trapno; /* TRAP # which caused the signal */
+#endif
+#ifdef __ARCH_SI_ERROR
+ int _error; /* CPU error code */
+#endif
+ } _sigfault;
+
+ /* SIGPOLL */
+ struct {
+ __ARCH_SI_BAND_T _band; /* POLL_IN, POLL_OUT, POLL_MSG */
+ int _fd;
+ } _sigpoll;
+ } _sifields;
+} siginfo_t;
+
+#ifdef __ARCH_SI_TRAPNO
+#define si_trapno _sifields._sigfault._trapno
+#endif
+#ifdef __ARCH_SI_ERROR
+#define si_error _sifields._sigfault._error
+#endif
+
+#undef si_addr
+#define si_addr _sifields._sigfault._addr
+
+#define GET_FAULTINFO_FROM_SI(fi, si) \
+ { \
+ (fi).cr2 = (unsigned long) (si).si_addr; \
+ (fi).error_code = (si).si_error; \
+ (fi).trap_no = (si).si_trapno; \
+ }
+
+#endif
diff --git a/arch/um/include/skas/mm_id.h b/arch/um/include/skas/mm_id.h
index 48dd098..a2e7643 100644
--- a/arch/um/include/skas/mm_id.h
+++ b/arch/um/include/skas/mm_id.h
@@ -7,7 +7,7 @@
#define __MM_ID_H
struct mm_id {
- union {
+ struct {
int mm_fd;
int pid;
} u;
diff --git a/arch/um/include/skas/skas.h b/arch/um/include/skas/skas.h
index b073f8a..6cc9e2a 100644
--- a/arch/um/include/skas/skas.h
+++ b/arch/um/include/skas/skas.h
@@ -6,18 +6,72 @@
#ifndef __SKAS_H
#define __SKAS_H
+#ifndef __KERNEL__
+#include <unistd.h>
+#include <sys/syscall.h>
+#endif
+#include "uml-config.h"
+
+#ifdef UML_CONFIG_X86_32
+#define __NR_new_mm 325
+#define __NR_switch_mm 326
+#else
+#define __NR_new_mm 286
+#define __NR_switch_mm 287
+#endif
+
+#define PTRACE_SWITCH_MM 33
+
+#ifndef __ASSEMBLY__
+
#include "sysdep/ptrace.h"
+#define STUB_ADDR(x) (STUB_CODE + (unsigned long) (x) - \
+ (unsigned long) &__syscall_stub_start)
+
extern int userspace_pid[];
extern int proc_mm, ptrace_faultinfo, ptrace_ldt;
extern int skas_needs_stub;
+extern int have_switch_mm;
+extern int have_ptrace_switch_mm;
+extern int have_siginfo_segv;
+extern int self_mm_fd;
+
extern int user_thread(unsigned long stack, int flags);
extern void new_thread_handler(void);
extern void handle_syscall(struct uml_pt_regs *regs);
-extern int new_mm(unsigned long stack);
+extern int make_new_mm(unsigned long stack);
extern void get_skas_faultinfo(int pid, struct faultinfo * fi);
extern long execute_syscall_skas(void *r);
extern unsigned long current_stub_stack(void);
+#ifndef __KERNEL__
+#include <errno.h>
+
+static inline long new_mm(void)
+{
+ int ret = syscall(__NR_new_mm, 0, 0, 0, 0, 0, 0);
+
+ if (ret < 0)
+ return -errno;
+
+ return ret;
+}
+
+static inline long switch_mm(int mm_fd, unsigned long *save_regs,
+ unsigned long *new_regs, unsigned long ip,
+ unsigned long sp)
+{
+ int ret = syscall(__NR_switch_mm, mm_fd, save_regs, new_regs, ip, sp, 0);
+
+ if (ret < 0)
+ return -errno;
+
+ return 0;
+}
+#endif
+
+#endif
+
#endif
diff --git a/arch/um/include/skas_ptrace.h b/arch/um/include/skas_ptrace.h
index cd2327d..6b55c52 100644
--- a/arch/um/include/skas_ptrace.h
+++ b/arch/um/include/skas_ptrace.h
@@ -7,7 +7,9 @@
#define __SKAS_PTRACE_H
#define PTRACE_FAULTINFO 52
-#define PTRACE_SWITCH_MM 55
+#ifndef OLD_PTRACE_SWITCH_MM
+#define OLD_PTRACE_SWITCH_MM 55
+#endif
#include "sysdep/skas_ptrace.h"
diff --git a/arch/um/kernel/ptrace.c b/arch/um/kernel/ptrace.c
index 47b57b4..25721bf 100644
--- a/arch/um/kernel/ptrace.c
+++ b/arch/um/kernel/ptrace.c
@@ -192,7 +192,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
}
#endif
#ifdef CONFIG_PROC_MM
- case PTRACE_SWITCH_MM: {
+ case OLD_PTRACE_SWITCH_MM: {
struct mm_struct *old = child->mm;
struct mm_struct *new = proc_mm_get_mm(data);
@@ -292,3 +292,14 @@ void syscall_trace(struct uml_pt_regs *regs, int entryexit)
current->exit_code = 0;
}
}
+
+int ptrace_to_pt_regs(struct pt_regs *to, struct user_regs __user *from)
+{
+ memcpy(to, &from->regs, sizeof(from->regs));
+ return 0;
+}
+
+int pt_regs_to_ptrace(struct user_regs __user *to, struct pt_regs *from)
+{
+ return copy_to_user(&to->regs, &from->regs.gp, sizeof(from->regs.gp));
+}
diff --git a/arch/um/kernel/reboot.c b/arch/um/kernel/reboot.c
index 04cebcf..0a5468e 100644
--- a/arch/um/kernel/reboot.c
+++ b/arch/um/kernel/reboot.c
@@ -11,7 +11,7 @@ void (*pm_power_off)(void);
static void kill_off_processes(void)
{
- if(proc_mm)
+ if(proc_mm || have_switch_mm)
/*
* FIXME: need to loop over userspace_pids
*/
diff --git a/arch/um/kernel/skas/mmu.c b/arch/um/kernel/skas/mmu.c
index f859ec3..2672829 100644
--- a/arch/um/kernel/skas/mmu.c
+++ b/arch/um/kernel/skas/mmu.c
@@ -65,6 +65,9 @@ static int init_stub_pte(struct mm_struct *mm, unsigned long proc,
return -ENOMEM;
}
+extern int copy_context_skas4(struct mm_id *id);
+extern int get_new_mm(void);
+
int init_new_context(struct task_struct *task, struct mm_struct *mm)
{
struct mm_context *from_mm = NULL;
@@ -101,14 +104,28 @@ int init_new_context(struct task_struct *task, struct mm_struct *mm)
from_mm = ¤t->mm->context;
if (proc_mm) {
- ret = new_mm(stack);
+ ret = make_new_mm(stack);
if (ret < 0) {
printk(KERN_ERR "init_new_context_skas - "
- "new_mm failed, errno = %d\n", ret);
+ "make_new_mm failed, errno = %d\n", ret);
goto out_free;
}
to_mm->id.u.mm_fd = ret;
}
+ else if (have_switch_mm) {
+ to_mm->id.u.mm_fd = get_new_mm();
+ if(to_mm->id.u.mm_fd < 0) {
+ ret = to_mm->id.u.mm_fd;
+ goto out_free;
+ }
+
+ ret = copy_context_skas4(&to_mm->id);
+ if (ret < 0) {
+ os_close_file(to_mm->id.u.mm_fd);
+ to_mm->id.u.mm_fd = -1;
+ goto out_free;
+ }
+ }
else {
if (from_mm)
to_mm->id.u.pid = copy_context_skas0(stack,
@@ -136,11 +153,15 @@ void destroy_context(struct mm_struct *mm)
{
struct mm_context *mmu = &mm->context;
- if (proc_mm)
+ if (proc_mm || have_switch_mm)
os_close_file(mmu->id.u.mm_fd);
- else
+ else {
os_kill_ptraced_process(mmu->id.u.pid, 1);
+ if (have_switch_mm)
+ os_close_file(mmu->id.u.mm_fd);
+ }
+
if (!proc_mm || !ptrace_faultinfo) {
free_page(mmu->id.stack);
pte_lock_deinit(virt_to_page(mmu->last_page_table));
diff --git a/arch/um/kernel/skas/process.c b/arch/um/kernel/skas/process.c
index fce389c..e5e8613 100644
--- a/arch/um/kernel/skas/process.c
+++ b/arch/um/kernel/skas/process.c
@@ -9,7 +9,7 @@
#include "os.h"
#include "skas.h"
-int new_mm(unsigned long stack)
+int make_new_mm(unsigned long stack)
{
int fd;
@@ -49,7 +49,7 @@ int __init start_uml(void)
{
stack_protections((unsigned long) &cpu0_irqstack);
set_sigstack(cpu0_irqstack, THREAD_SIZE);
- if (proc_mm)
+ if (proc_mm || have_switch_mm)
userspace_pid[0] = start_userspace(0);
init_new_thread_signals();
diff --git a/arch/um/kernel/syscall.c b/arch/um/kernel/syscall.c
index b9d92b2..9e6c11a 100644
--- a/arch/um/kernel/syscall.c
+++ b/arch/um/kernel/syscall.c
@@ -151,3 +151,13 @@ int kernel_execve(const char *filename, char *const argv[], char *const envp[])
return ret;
}
+
+extern long do_switch_mm(int fd, long __user *save, long __user *new,
+ unsigned long ip, unsigned long sp,
+ struct pt_regs *regs);
+
+long sys_switch_mm(int fd, long __user *save, long __user *new,
+ unsigned long ip, unsigned long sp)
+{
+ return do_switch_mm(fd, save, new, ip, sp, ¤t->thread.regs);
+}
diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index f1c7139..d92108b 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -271,7 +271,9 @@ int __init linux_main(int argc, char **argv)
can_do_skas();
- if (proc_mm && ptrace_faultinfo)
+ if (have_switch_mm)
+ mode = "SKAS4";
+ else if (proc_mm && ptrace_faultinfo)
mode = "SKAS3";
else
mode = "SKAS0";
diff --git a/arch/um/os-Linux/skas/mem.c b/arch/um/os-Linux/skas/mem.c
index 484e68f..19ff668 100644
--- a/arch/um/os-Linux/skas/mem.c
+++ b/arch/um/os-Linux/skas/mem.c
@@ -6,6 +6,7 @@
#include <stddef.h>
#include <unistd.h>
#include <errno.h>
+#include <signal.h>
#include <string.h>
#include <sys/mman.h>
#include "init.h"
@@ -22,7 +23,7 @@
#include "sysdep/stub.h"
#include "uml-config.h"
-extern unsigned long batch_syscall_stub, __syscall_stub_start;
+extern unsigned long batch_syscall_stub, switch_mm_stub, __syscall_stub_start;
extern void wait_stub_done(int pid);
@@ -41,34 +42,63 @@ static unsigned long syscall_regs[MAX_REG_NR];
static int __init init_syscall_regs(void)
{
get_safe_registers(syscall_regs);
- syscall_regs[REGS_IP_INDEX] = STUB_CODE +
- ((unsigned long) &batch_syscall_stub -
- (unsigned long) &__syscall_stub_start);
+
+ syscall_regs[REGS_IP_INDEX] = STUB_ADDR(&batch_syscall_stub);
return 0;
}
__initcall(init_syscall_regs);
-extern int proc_mm;
+static int syscall_stub_done(unsigned long stack)
+{
+ unsigned long *syscall, *data, offset;
+ int ret, n;
-int single_count = 0;
-int multi_count = 0;
-int multi_op_count = 0;
+ /*
+ * When the stub stops, we find the following values on the
+ * beginning of the stack:
+ * (long) return_value
+ * (long) offset to failed sycall data (0 if no error)
+ */
+ ret = *((unsigned long *) stack);
+ offset = *((unsigned long *) stack + 1);
+ if (offset == 0)
+ return 0;
-static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr)
+ data = (unsigned long *)(stack + offset - STUB_DATA);
+ printk(UM_KERN_ERR "syscall_stub_done : ret = %d, offset = %ld, "
+ "data = %p\n", ret, offset, data);
+ syscall = (unsigned long *)((unsigned long)data + data[0]);
+ printk(UM_KERN_ERR "syscall_stub_done : syscall %ld failed, "
+ "return value = 0x%x, expected return value = 0x%lx\n",
+ syscall[0], ret, syscall[7]);
+ printk(UM_KERN_ERR " syscall parameters: "
+ "0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
+ syscall[1], syscall[2], syscall[3],
+ syscall[4], syscall[5], syscall[6]);
+ for (n = 1; n < data[0]/sizeof(long); n++) {
+ if (n == 1)
+ printk(UM_KERN_ERR " additional syscall "
+ "data:");
+ if (n % 4 == 1)
+ printk("\n" UM_KERN_ERR " ");
+ printk(" 0x%lx", data[n]);
+ }
+ if (n > 1)
+ printk("\n");
+
+ return ret;
+}
+
+static long do_syscall_stub(struct mm_id *mm_idp, void **addr)
{
- int n, i;
- long ret, offset;
- unsigned long * data;
- unsigned long * syscall;
- int err, pid = mm_idp->u.pid;
+ long ret;
+ int n, i, err, pid = mm_idp->u.pid;
if (proc_mm)
/* FIXME: Need to look up userspace_pid by cpu */
pid = userspace_pid[0];
- multi_count++;
-
n = ptrace_setregs(pid, syscall_regs);
if (n < 0) {
printk(UM_KERN_ERR "Registers - \n");
@@ -85,52 +115,71 @@ static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr)
wait_stub_done(pid);
- /*
- * When the stub stops, we find the following values on the
- * beginning of the stack:
- * (long )return_value
- * (long )offset to failed sycall-data (0, if no error)
- */
- ret = *((unsigned long *) mm_idp->stack);
- offset = *((unsigned long *) mm_idp->stack + 1);
- if (offset) {
- data = (unsigned long *)(mm_idp->stack + offset - STUB_DATA);
- printk(UM_KERN_ERR "do_syscall_stub : ret = %ld, offset = %ld, "
- "data = %p\n", ret, offset, data);
- syscall = (unsigned long *)((unsigned long)data + data[0]);
- printk(UM_KERN_ERR "do_syscall_stub: syscall %ld failed, "
- "return value = 0x%lx, expected return value = 0x%lx\n",
- syscall[0], ret, syscall[7]);
- printk(UM_KERN_ERR " syscall parameters: "
- "0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
- syscall[1], syscall[2], syscall[3],
- syscall[4], syscall[5], syscall[6]);
- for (n = 1; n < data[0]/sizeof(long); n++) {
- if (n == 1)
- printk(UM_KERN_ERR " additional syscall "
- "data:");
- if (n % 4 == 1)
- printk("\n" UM_KERN_ERR " ");
- printk(" 0x%lx", data[n]);
- }
- if (n > 1)
- printk("\n");
- }
- else ret = 0;
+ ret = syscall_stub_done(mm_idp->stack);
+
+ *addr = check_init_stack(mm_idp, NULL);
+
+ return ret;
+}
+
+long do_syscall_stub_skas4(struct mm_id *mm_idp, void **addr, unsigned long ip,
+ unsigned long sp)
+{
+ long ret;
+ unsigned long return_regs[MAX_REG_NR], *ptr;
+ int err;
+ sigset_t sigs, old;
+
+ ptr = (unsigned long *) (mm_idp->stack + UM_KERN_PAGE_SIZE -
+ sizeof(long));
+ *ptr = (unsigned long) return_regs;
+ *(ptr - 1) = self_mm_fd;
+
+ sigfillset(&sigs);
+ sigprocmask(SIG_SETMASK, &sigs, &old);
+ err = switch_mm(mm_idp->u.mm_fd, return_regs, NULL, ip, sp);
+ sigprocmask(SIG_SETMASK, &old, NULL);
+
+ ret = syscall_stub_done(mm_idp->stack);
*addr = check_init_stack(mm_idp, NULL);
return ret;
}
-long run_syscall_stub(struct mm_id * mm_idp, int syscall,
+static int flush_syscalls(struct mm_id *mm_idp, void **addr, int extra)
+{
+ unsigned long *stack = check_init_stack(mm_idp, *addr);
+ int current, end;
+
+ current = ((unsigned long) stack) & ~UM_KERN_PAGE_MASK;
+ end = UM_KERN_PAGE_SIZE;
+
+ if(have_switch_mm)
+ end -= 2 * sizeof(long);
+
+ if (current + (10 + extra) * sizeof(long) < end)
+ return 0;
+
+ if (have_switch_mm)
+ return do_syscall_stub_skas4(mm_idp, addr,
+ STUB_ADDR(&switch_mm_stub), 0);
+ else
+ return do_syscall_stub(mm_idp, addr);
+}
+
+long run_syscall_stub(struct mm_id *mm_idp, int syscall,
unsigned long *args, long expected, void **addr,
int done)
{
- unsigned long *stack = check_init_stack(mm_idp, *addr);
+ unsigned long *stack;
+ int ret;
- if (done && *addr == NULL)
- single_count++;
+ ret = flush_syscalls(mm_idp, addr, 0);
+ if (ret)
+ return ret;
+
+ stack = check_init_stack(mm_idp, *addr);
*stack += sizeof(long);
stack += *stack / sizeof(long);
@@ -144,45 +193,39 @@ long run_syscall_stub(struct mm_id * mm_idp, int syscall,
*stack++ = args[5];
*stack++ = expected;
*stack = 0;
- multi_op_count++;
- if (!done && ((((unsigned long) stack) & ~UM_KERN_PAGE_MASK) <
- UM_KERN_PAGE_SIZE - 10 * sizeof(long))) {
+ if (!done) {
*addr = stack;
return 0;
}
- return do_syscall_stub(mm_idp, addr);
+ if (have_switch_mm)
+ return do_syscall_stub_skas4(mm_idp, addr,
+ STUB_ADDR(&switch_mm_stub), 0);
+ else
+ return do_syscall_stub(mm_idp, addr);
+
+ *addr = stack;
+ return 0;
}
-long syscall_stub_data(struct mm_id * mm_idp,
- unsigned long *data, int data_count,
- void **addr, void **stub_addr)
+long syscall_stub_data(struct mm_id *mm_idp, unsigned long *data,
+ int data_count, void **addr, void **stub_addr)
{
unsigned long *stack;
- int ret = 0;
+ int ret;
- /*
- * If *addr still is uninitialized, it *must* contain NULL.
- * Thus in this case do_syscall_stub correctly won't be called.
- */
- if ((((unsigned long) *addr) & ~UM_KERN_PAGE_MASK) >=
- UM_KERN_PAGE_SIZE - (10 + data_count) * sizeof(long)) {
- ret = do_syscall_stub(mm_idp, addr);
- /* in case of error, don't overwrite data on stack */
- if (ret)
- return ret;
- }
+ ret = flush_syscalls(mm_idp, addr, data_count);
+ if (ret)
+ return ret;
stack = check_init_stack(mm_idp, *addr);
- *addr = stack;
-
- *stack = data_count * sizeof(long);
+ *stack++ = data_count * sizeof(long);
- memcpy(stack + 1, data, data_count * sizeof(long));
+ memcpy(stack, data, data_count * sizeof(long));
- *stub_addr = (void *)(((unsigned long)(stack + 1) &
- ~UM_KERN_PAGE_MASK) + STUB_DATA);
+ *stub_addr = (void *)(((unsigned long) stack & ~UM_KERN_PAGE_MASK) +
+ STUB_DATA);
return 0;
}
diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index e8b7a97..d4da448 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -3,6 +3,9 @@
* Licensed under the GPL
*/
+/* Include this first, before anything else includes <signal.h> */
+#include "siginfo_segv.h"
+
#include <stdlib.h>
#include <unistd.h>
#include <sched.h>
@@ -91,11 +94,23 @@ bad_wait:
extern unsigned long current_stub_stack(void);
+#ifndef PTRACE_GETSIGINFO
+#define PTRACE_GETSIGINFO 0x4202
+#endif
+
void get_skas_faultinfo(int pid, struct faultinfo * fi)
{
+ siginfo_t si;
int err;
- if (ptrace_faultinfo) {
+ if(have_siginfo_segv){
+ err = ptrace(PTRACE_GETSIGINFO, pid, 0, &si);
+ if(err)
+ printk("PTRACE_GETSIGINFO failed, err = %d\n", errno);
+
+ GET_FAULTINFO_FROM_SI(*fi, si);
+ }
+ else if (ptrace_faultinfo) {
err = ptrace(PTRACE_FAULTINFO, pid, 0, fi);
if (err)
panic("get_skas_faultinfo - PTRACE_FAULTINFO failed, "
@@ -212,12 +227,9 @@ static int userspace_tramp(void *stack)
}
}
}
- if (!ptrace_faultinfo && (stack != NULL)) {
+ if (!ptrace_faultinfo) {
struct sigaction sa;
-
- unsigned long v = STUB_CODE +
- (unsigned long) stub_segv_handler -
- (unsigned long) &__syscall_stub_start;
+ unsigned long v = STUB_ADDR(stub_segv_handler);
set_sigstack((void *) STUB_DATA, UM_KERN_PAGE_SIZE);
sigemptyset(&sa.sa_mask);
@@ -256,7 +268,7 @@ int start_userspace(unsigned long stub_stack)
sp = (unsigned long) stack + UM_KERN_PAGE_SIZE - sizeof(void *);
flags = CLONE_FILES;
- if (proc_mm)
+ if (proc_mm || have_switch_mm)
flags |= CLONE_VM;
else
flags |= SIGCHLD;
@@ -369,8 +381,14 @@ void userspace(struct uml_pt_regs *regs)
printk(UM_KERN_ERR "userspace - child stopped "
"with signal %d\n", sig);
}
- pid = userspace_pid[0];
+
+ /*
+ * userspace_pid can change in in_interrupt since
+ * PTRACE_SWITCH_MM can cause a process to change
+ * address spaces
+ */
interrupt_end();
+ pid = userspace_pid[0];
/* Avoid -ERESTARTSYS handling in host */
if (PT_SYSCALL_NR_OFFSET != PT_SYSCALL_RET_OFFSET)
@@ -385,9 +403,7 @@ static int __init init_thread_regs(void)
{
get_safe_registers(thread_regs);
/* Set parent's instruction pointer to start of clone-stub */
- thread_regs[REGS_IP_INDEX] = STUB_CODE +
- (unsigned long) stub_clone_handler -
- (unsigned long) &__syscall_stub_start;
+ thread_regs[REGS_IP_INDEX] = STUB_ADDR(stub_clone_handler);
thread_regs[REGS_SP_INDEX] = STUB_DATA + UM_KERN_PAGE_SIZE -
sizeof(void *);
#ifdef __SIGNAL_FRAMESIZE
@@ -458,6 +474,56 @@ int copy_context_skas0(unsigned long new_stack, int pid)
return pid;
}
+extern unsigned long switch_mm_stub;
+extern long task_size;
+
+static void unmap_new_as(void)
+{
+ void (*p)(void);
+ void *addr;
+ unsigned long stack = (unsigned long) &stack & ~(UM_KERN_PAGE_SIZE - 1);
+ unsigned long long data_offset, code_offset;
+ int fd = phys_mapping(to_phys((void *) stack), &data_offset);
+
+ addr = mmap((void *) STUB_DATA, UM_KERN_PAGE_SIZE,
+ PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, fd,
+ data_offset);
+ if (addr == MAP_FAILED)
+ panic("Failed to remap stack");
+
+ fd = phys_mapping(to_phys(&__syscall_stub_start), &code_offset);
+ addr = mmap((void *) STUB_CODE, UM_KERN_PAGE_SIZE,
+ PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, fd,
+ code_offset);
+ if (addr == MAP_FAILED)
+ panic("Failed to remap code");
+
+ p = (void (*)(void)) (STUB_ADDR(&switch_mm_stub));
+ (*p)();
+}
+
+extern long do_syscall_stub_skas4(struct mm_id *mm_idp, void **addr,
+ unsigned long ip, unsigned long sp);
+
+int copy_context_skas4(struct mm_id *id)
+{
+ void *data = NULL;
+ int err;
+
+ err = unmap(id, 0, STUB_START, 0, &data);
+ if (err)
+ return err;
+
+ if (STUB_END < task_size) {
+ err = unmap(id, STUB_END, task_size - STUB_END, 0, &data);
+ if (err)
+ return err;
+ }
+
+ return do_syscall_stub_skas4(id, &data, (unsigned long) unmap_new_as,
+ id->stack + UM_KERN_PAGE_SIZE / 2);
+}
+
/*
* This is used only, if stub pages are needed, while proc_mm is
* available. Opening /proc/mm creates a new mm_context, which lacks
@@ -612,11 +678,18 @@ void __switch_mm(struct mm_id *mm_idp)
/* FIXME: need cpu pid in __switch_mm */
if (proc_mm) {
- err = ptrace(PTRACE_SWITCH_MM, userspace_pid[0], 0,
+ err = ptrace(OLD_PTRACE_SWITCH_MM, userspace_pid[0], 0,
mm_idp->u.mm_fd);
if (err)
- panic("__switch_mm - PTRACE_SWITCH_MM failed, "
+ panic("__switch_mm - OLD_PTRACE_SWITCH_MM failed, "
"errno = %d\n", errno);
}
+ else if (have_ptrace_switch_mm) {
+ err = ptrace(PTRACE_SWITCH_MM, userspace_pid[0], 0,
+ mm_idp->u.mm_fd);
+ if (err)
+ panic("__switch_mm - PTRACE_SWITCH_MM "
+ "failed, errno = %d\n", errno);
+ }
else userspace_pid[0] = mm_idp->u.pid;
}
diff --git a/arch/um/os-Linux/start_up.c b/arch/um/os-Linux/start_up.c
index 7b81f6c..9e866b4 100644
--- a/arch/um/os-Linux/start_up.c
+++ b/arch/um/os-Linux/start_up.c
@@ -3,6 +3,9 @@
* Licensed under the GPL
*/
+/* Include this first, before anything else includes <signal.h> */
+#include "siginfo_segv.h"
+
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
@@ -23,7 +26,9 @@
#include "mem_user.h"
#include "ptrace_user.h"
#include "registers.h"
+#include "skas.h"
#include "skas_ptrace.h"
+#include "sysdep/sigcontext.h"
static int ptrace_child(void)
{
@@ -141,14 +146,36 @@ static int stop_ptraced_child(int pid, int exitcode, int mustexit)
}
/* Changed only during early boot */
-int ptrace_faultinfo = 1;
-int ptrace_ldt = 1;
-int proc_mm = 1;
-int skas_needs_stub = 0;
+int ptrace_faultinfo;
+static int disable_ptrace_faultinfo;
+
+int ptrace_ldt;
+static int disable_ptrace_ldt;
+
+int proc_mm;
+static int disable_proc_mm;
+
+int have_switch_mm;
+static int disable_switch_mm;
+
+int have_siginfo_segv;
+static int disable_siginfo_segv;
+
+int have_ptrace_switch_mm;
+static int disable_ptrace_switch_mm;
+
+int skas_needs_stub;
static int __init skas0_cmd_param(char *str, int* add)
{
- ptrace_faultinfo = proc_mm = 0;
+ disable_ptrace_faultinfo = 1;
+ disable_ptrace_ldt = 1;
+ disable_proc_mm = 1;
+
+ disable_switch_mm = 1;
+ disable_siginfo_segv = 1;
+ disable_ptrace_switch_mm = 1;
+
return 0;
}
@@ -158,15 +185,12 @@ static int __init mode_skas0_cmd_param(char *str, int* add)
__attribute__((alias("skas0_cmd_param")));
__uml_setup("skas0", skas0_cmd_param,
- "skas0\n"
- " Disables SKAS3 usage, so that SKAS0 is used, unless \n"
- " you specify mode=tt.\n\n");
+"skas0\n"
+" Disables SKAS3 and SKAS4 usage, so that SKAS0 is used\n\n");
__uml_setup("mode=skas0", mode_skas0_cmd_param,
- "mode=skas0\n"
- " Disables SKAS3 usage, so that SKAS0 is used, unless you \n"
- " specify mode=tt. Note that this was recently added - on \n"
- " older kernels you must use simply \"skas0\".\n\n");
+"mode=skas0\n"
+" Disables SKAS3 and SKAS4 usage, so that SKAS0 is used.\n\n");
/* Changed only during early boot */
static int force_sysemu_disabled = 0;
@@ -341,6 +365,8 @@ static void __init check_coredump_limit(void)
void __init os_early_checks(void)
{
+ int pid;
+
/* Print out the core dump limits early */
check_coredump_limit();
@@ -350,11 +376,15 @@ void __init os_early_checks(void)
* kernel is running.
*/
check_tmpexec();
+
+ pid = start_ptraced_child();
+ init_registers(pid);
+ stop_ptraced_child(pid, 1, 1);
}
static int __init noprocmm_cmd_param(char *str, int* add)
{
- proc_mm = 0;
+ disable_proc_mm = 1;
return 0;
}
@@ -366,7 +396,7 @@ __uml_setup("noprocmm", noprocmm_cmd_param,
static int __init noptracefaultinfo_cmd_param(char *str, int* add)
{
- ptrace_faultinfo = 0;
+ disable_ptrace_faultinfo = 1;
return 0;
}
@@ -378,7 +408,7 @@ __uml_setup("noptracefaultinfo", noptracefaultinfo_cmd_param,
static int __init noptraceldt_cmd_param(char *str, int* add)
{
- ptrace_ldt = 0;
+ disable_ptrace_ldt = 1;
return 0;
}
@@ -398,20 +428,18 @@ static inline void check_skas3_ptrace_faultinfo(void)
n = ptrace(PTRACE_FAULTINFO, pid, 0, &fi);
if (n < 0) {
- ptrace_faultinfo = 0;
if (errno == EIO)
non_fatal("not found\n");
else
perror("not found");
}
+ else if (disable_ptrace_faultinfo)
+ non_fatal("found but disabled on command line\n");
else {
- if (!ptrace_faultinfo)
- non_fatal("found but disabled on command line\n");
- else
- non_fatal("found\n");
+ ptrace_faultinfo = 1;
+ non_fatal("found\n");
}
- init_registers(pid);
stop_ptraced_child(pid, 1, 1);
}
@@ -435,38 +463,32 @@ static inline void check_skas3_ptrace_ldt(void)
else {
perror("not found");
}
- ptrace_ldt = 0;
}
+ else if (disable_ptrace_ldt)
+ non_fatal("found, but use is disabled\n");
else {
- if (ptrace_ldt)
- non_fatal("found\n");
- else
- non_fatal("found, but use is disabled\n");
+ ptrace_ldt = 1;
+ non_fatal("found\n");
}
stop_ptraced_child(pid, 1, 1);
-#else
- /* PTRACE_LDT might be disabled via cmdline option.
- * We want to override this, else we might use the stub
- * without real need
- */
- ptrace_ldt = 1;
#endif
}
static inline void check_skas3_proc_mm(void)
{
non_fatal(" - /proc/mm...");
- if (access("/proc/mm", W_OK) < 0) {
- proc_mm = 0;
+ if (access("/proc/mm", W_OK) < 0)
perror("not found");
- }
- else if (!proc_mm)
+ else if (disable_proc_mm)
non_fatal("found but disabled on command line\n");
- else non_fatal("found\n");
+ else {
+ proc_mm = 1;
+ non_fatal("found\n");
+ }
}
-int can_do_skas(void)
+static void can_do_skas3(void)
{
non_fatal("Checking for the skas3 patch in the host:\n");
@@ -476,8 +498,338 @@ int can_do_skas(void)
if (!proc_mm || !ptrace_faultinfo || !ptrace_ldt)
skas_needs_stub = 1;
+}
+
+static void *fault_address;
+
+static int check_fault_info(struct faultinfo *fi)
+{
+ return (FAULT_ADDRESS(*fi) == (unsigned long) fault_address) &&
+ FAULT_WRITE(*fi) && SEGV_IS_FIXABLE(fi);
+}
+
+static jmp_buf siginfo_buf;
+
+static void segv_handler(int sig, siginfo_t *si, void *foo)
+{
+ struct faultinfo fi;
+ int n;
+
+ GET_FAULTINFO_FROM_SI(fi, *si);
+ n = check_fault_info(&fi) ? 1 : 2;
+ longjmp(siginfo_buf, n);
+}
+
+static int fault(void)
+{
+ struct sigaction sa, old;
+ int err, n;
+
+ /*
+ * The cast is needed because the CPP manipulations of
+ * siginfo_t resulted in sa_sigaction having an old_siginfo_t
+ * parameter.
+ */
+ sa.sa_sigaction = (void (*)(int, old_siginfo_t *, void *)) segv_handler;
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = SA_SIGINFO | SA_NODEFER;
+
+ err = sigaction(SIGSEGV, &sa, &old);
+ if (err)
+ fatal_perror("sigaction");
+
+ /*
+ * Provide a guaranteed invalid address by mapping a page into
+ * a hole in the address space and then unmapping it.
+ */
+ fault_address = mmap(NULL, UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ if (fault_address == MAP_FAILED)
+ fatal_perror("mmap failed");
+
+ if (munmap(fault_address, UM_KERN_PAGE_SIZE) < 0)
+ fatal_perror("munmap failed");
+
+ n = setjmp(siginfo_buf);
+ if (n == 0)
+ *((unsigned long *) fault_address) = 0;
+
+ err = sigaction(SIGSEGV, &old, NULL);
+
+ return n;
+}
+
+static int __init nogetsiginfo_cmd_param(char *str, int *add)
+{
+ disable_siginfo_segv = 1;
+ return 0;
+}
+
+__uml_setup("nogetsiginfo", nogetsiginfo_cmd_param,
+"nogetsiginfo\n"
+" Turns off usage of PTRACE_GETSIGINFO to read page fault information\n"
+" from a child process, even if the host supports it.\n\n");
+
+#ifndef PTRACE_GETSIGINFO
+#define PTRACE_GETSIGINFO 0x4202
+#endif
+
+static int check_siginfo(void)
+{
+ siginfo_t si;
+ struct faultinfo fi;
+ int ok, pid, err, status;
+
+ non_fatal("\tFull CPU fault information in siginfo_t ... ");
+ ok = fault();
+ if (ok)
+ non_fatal("OK\n");
+ else {
+ non_fatal("Failed\n");
+ return 0;
+ }
+
+ non_fatal("\tFull CPU fault information in PTRACE_GETSIGINFO ... ");
+
+ pid = fork();
+ if (pid < 0)
+ fatal_perror("fork failed");
+ else if (pid == 0) {
+ ptrace(PTRACE_TRACEME, 0, 0, 0);
+ fault();
+ exit(1);
+ }
+
+ while(1){
+ err = waitpid(pid, &status, WUNTRACED);
+ if (err < 0)
+ fatal_perror("wait failed");
+
+ if (WIFSTOPPED(status) && (WSTOPSIG(status) == SIGSEGV))
+ break;
+ }
+
+ err = ptrace(PTRACE_GETSIGINFO, pid, 0, &si);
+ if (err < 0)
+ fatal_perror("PTRACE_GETSIGINFO failed");
+
+ ptrace(PTRACE_KILL, pid, 0, 0);
+
+ GET_FAULTINFO_FROM_SI(fi, si);
+ ok = check_fault_info(&fi);
+ if (ok)
+ non_fatal("OK\n");
+ else
+ non_fatal("Failed\n");
+
+ if (disable_siginfo_segv)
+ non_fatal("Extended PTRACE_GETSIGINFO disabled on command "
+ "line");
+ else
+ have_siginfo_segv = 1;
+
+ return ok;
+}
+
+static char *mm_stack;
+static unsigned long return_regs[MAX_REG_NR];
+int self_mm_fd;
+
+static int switch_mm_works;
+
+static void after_switch(void)
+{
+ /*
+ * If we are really in a new address space, setting this to
+ * zero won't affect the value of 1 already set in the old
+ * address space.
+ */
+ switch_mm_works = 0;
+
+ switch_mm(self_mm_fd, NULL, return_regs, 0, 0);
+}
+
+static int check_switch_mm(void)
+{
+ int err, there = -1;
+
+ non_fatal("\t/proc/self/mm ... ");
+ self_mm_fd = open("/proc/self/mm", O_RDONLY);
+ if (self_mm_fd < 0)
+ goto bad;
+ non_fatal("OK\n");
+
+ mm_stack = mmap(NULL, UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ if(mm_stack == MAP_FAILED)
+ goto bad;
+
+ non_fatal("\tnew_mm ... ");
+ there = new_mm();
+ if(there < 0)
+ goto bad;
+ non_fatal("OK\n");
+
+ switch_mm_works = 1;
+
+ non_fatal("\tswitching over ... ");
+ err = switch_mm(there, return_regs, NULL, (unsigned long) after_switch,
+ ((unsigned long) &mm_stack[UM_KERN_PAGE_SIZE]) -
+ sizeof(void *));
+ if (err < 0)
+ goto bad;
+ non_fatal("switched back ... ");
+ if(!switch_mm_works)
+ goto bad;
+ else
+ non_fatal("OK\n");
+
+ munmap(mm_stack, UM_KERN_PAGE_SIZE);
+ close(there);
+
+ if (disable_switch_mm)
+ non_fatal("switch_mm support disabled on command line\n");
+ else
+ have_switch_mm = 1;
+
+ return 1;
+ bad:
+ if (there > 0)
+ close(there);
+ munmap(mm_stack, UM_KERN_PAGE_SIZE);
+ non_fatal("Failed - \n");
+ perror("");
+ return 0;
+}
+
+static int ptrace_switch_mm_works;
+
+static int after_ptrace_switch(void)
+{
+ ptrace_switch_mm_works = 1;
+ exit(0);
+}
+
+static int check_ptrace_switch_mm(void)
+{
+ void *stack;
+ unsigned long regs[MAX_REG_NR];
+ int pid, here, err, status;
+
+ non_fatal("\tPTRACE_SWITCH_MM ... ");
+ pid = fork();
+ if(pid == 0){
+ ptrace(PTRACE_TRACEME, 0, 0, 0);
+ kill(getpid(), SIGSTOP);
+
+ exit(0);
+ }
+ else if(pid < 0)
+ goto bad;
+
+ stack = mmap(NULL, UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
+ MAP_SHARED | MAP_ANONYMOUS, -1, 0);
+ if(stack == MAP_FAILED)
+ goto bad;
+
+ here = open("/proc/self/mm", O_RDONLY);
+ if(here < 0)
+ goto bad_unmap;
+
+ err = waitpid(pid, &status, WUNTRACED);
+ if (err < 0)
+ goto bad_close;
+ else if (err != pid) {
+ non_fatal("waitpid returned %d, expected %d\n", err, pid);
+ goto bad_close;
+ }
+ else if (!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP)) {
+ non_fatal("waitpid returned status 0x%d\n", status);
+ goto bad_close;
+ }
+
+ err = ptrace(PTRACE_GETREGS, pid, 0, regs);
+ if (err < 0)
+ goto bad_close;
+
+ regs[REGS_IP_INDEX] = (unsigned long) after_ptrace_switch;
+ regs[REGS_SP_INDEX] = (unsigned long) stack + UM_KERN_PAGE_SIZE -
+ sizeof(void *);
+
+ if (ptrace(PTRACE_SETREGS, pid, 0, regs) < 0)
+ goto bad_close;
+
+ if (ptrace(PTRACE_SWITCH_MM, pid, NULL, here) < 0)
+ goto bad_close;
+
+ if (ptrace(PTRACE_CONT, pid, NULL, 0) < 0)
+ goto bad_close;
+
+ err = waitpid(pid, &status, WUNTRACED);
+ if (err < 0)
+ goto bad_close;
+ else if(err != pid) {
+ non_fatal("waitpid returned %d, expected %d\n", err, pid);
+ goto bad_close;
+ }
+ else if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
+ non_fatal("waitpid returned status 0x%d\n", status);
+ goto bad_close;
+ }
+
+ if (!ptrace_switch_mm_works)
+ goto bad_close;
+ else non_fatal("OK\n");
+
+ if (disable_ptrace_switch_mm)
+ non_fatal("PTRACE_SWITCH_MM support disabled on command "
+ "line\n");
+ else
+ have_ptrace_switch_mm = 1;
+
+ close(here);
+ munmap(stack, UM_KERN_PAGE_SIZE);
return 1;
+
+ bad_close:
+ close(here);
+ bad_unmap:
+ munmap(stack, UM_KERN_PAGE_SIZE);
+ bad:
+ non_fatal("Failed - \n");
+ perror("");
+ return 0;
+}
+
+static int can_do_skas4(void)
+{
+ int ret;
+
+ non_fatal("Checking for new_mm and switch_mm support in the host:\n");
+
+ ret = check_switch_mm() && check_ptrace_switch_mm() && check_siginfo();
+ if (ret)
+ skas_needs_stub = 1;
+
+ return ret;
+}
+
+void can_do_skas(void)
+{
+ if (!can_do_skas4())
+ can_do_skas3();
+}
+
+int get_new_mm(void)
+{
+ int err;
+
+ err = new_mm();
+ if (err < 0)
+ err = -errno;
+
+ return err;
}
int __init parse_iomem(char *str, int *add)
diff --git a/arch/um/sys-i386/ldt.c b/arch/um/sys-i386/ldt.c
index 67c0958..c06c66c 100644
--- a/arch/um/sys-i386/ldt.c
+++ b/arch/um/sys-i386/ldt.c
@@ -436,7 +436,7 @@ long init_new_ldt(struct mm_context *new_mm, struct mm_context *from_mm)
/*
* We have a valid from_mm, so we now have to copy the LDT of
* from_mm to new_mm, because using proc_mm an new mm with
- * an empty/default LDT was created in new_mm()
+ * an empty/default LDT was created in make_new_mm()
*/
copy = ((struct proc_mm_op) { .op = MM_COPY_SEGMENTS,
.u =
diff --git a/arch/um/sys-i386/stub.S b/arch/um/sys-i386/stub.S
index e730772..b7e893e 100644
--- a/arch/um/sys-i386/stub.S
+++ b/arch/um/sys-i386/stub.S
@@ -1,52 +1,60 @@
#include "uml-config.h"
#include "as-layout.h"
+#include "skas/skas.h"
+
+#define PROCESS_LIST \
+ /* load pointer to first operation */ \
+ mov $(ASM_STUB_DATA + 8), %esp; \
+1: \
+ /* load length of additional data */ \
+ mov 0x0(%esp), %eax; \
+ /* if(length == 0) : end of list */ \
+ /* write possible 0 to header */ \
+ mov %eax, ASM_STUB_DATA + 4; \
+ cmpl $0, %eax; \
+ jz 2f; \
+ /* save current pointer */ \
+ mov %esp, ASM_STUB_DATA + 4; \
+ /* skip additional data */ \
+ add %eax, %esp; \
+ /* load syscall-# */ \
+ pop %eax; \
+ /* load syscall params */ \
+ pop %ebx; \
+ pop %ecx; \
+ pop %edx; \
+ pop %esi; \
+ pop %edi; \
+ pop %ebp; \
+ /* execute syscall */ \
+ int $0x80; \
+ /* check return value */ \
+ pop %ebx; \
+ cmp %ebx, %eax; \
+ je 1b; \
+2: \
+ /* save return value */ \
+ mov %eax, ASM_STUB_DATA;
.globl syscall_stub
.section .__syscall_stub, "x"
.globl batch_syscall_stub
batch_syscall_stub:
- /* load pointer to first operation */
- mov $(ASM_STUB_DATA+8), %esp
-
-again:
- /* load length of additional data */
- mov 0x0(%esp), %eax
-
- /* if(length == 0) : end of list */
- /* write possible 0 to header */
- mov %eax, ASM_STUB_DATA+4
- cmpl $0, %eax
- jz done
-
- /* save current pointer */
- mov %esp, ASM_STUB_DATA+4
-
- /* skip additional data */
- add %eax, %esp
-
- /* load syscall-# */
- pop %eax
+ PROCESS_LIST
+ /* stop */
+ int3
- /* load syscall params */
- pop %ebx
- pop %ecx
- pop %edx
- pop %esi
- pop %edi
- pop %ebp
+ .globl switch_mm_stub
+switch_mm_stub:
+ PROCESS_LIST
- /* execute syscall */
+ mov $__NR_switch_mm, %eax
+ mov ASM_STUB_DATA + UM_KERN_PAGE_SIZE - 8, %ebx
+ xor %ecx, %ecx
+ mov ASM_STUB_DATA + UM_KERN_PAGE_SIZE - 4, %edx
+ xor %esi, %esi
+ xor %edi, %edi
int $0x80
- /* check return value */
- pop %ebx
- cmp %ebx, %eax
- je again
-
-done:
- /* save return value */
- mov %eax, ASM_STUB_DATA
-
- /* stop */
int3
diff --git a/arch/um/sys-x86_64/stub.S b/arch/um/sys-x86_64/stub.S
index 4afe204..20b682d 100644
--- a/arch/um/sys-x86_64/stub.S
+++ b/arch/um/sys-x86_64/stub.S
@@ -1,67 +1,68 @@
#include "uml-config.h"
#include "as-layout.h"
+#include "skas/skas.h"
- .globl syscall_stub
-.section .__syscall_stub, "x"
-syscall_stub:
- syscall
- /* We don't have 64-bit constants, so this constructs the address
- * we need.
- */
- movq $(ASM_STUB_DATA >> 32), %rbx
- salq $32, %rbx
- movq $(ASM_STUB_DATA & 0xffffffff), %rcx
- or %rcx, %rbx
- movq %rax, (%rbx)
- int3
+#define PROCESS_LIST \
+ mov $(ASM_STUB_DATA >> 32), %rbx; \
+ sal $32, %rbx; \
+ mov $(ASM_STUB_DATA & 0xffffffff), %rax; \
+ or %rax, %rbx; \
+ /* load pointer to first operation */ \
+ mov %rbx, %rsp; \
+ add $0x10, %rsp; \
+1: \
+ /* load length of additional data */ \
+ mov 0x0(%rsp), %rax; \
+ /* if(length == 0) : end of list */ \
+ /* write possible 0 to header */ \
+ mov %rax, 8(%rbx); \
+ cmp $0, %rax; \
+ jz 2f; \
+ /* save current pointer */ \
+ mov %rsp, 8(%rbx); \
+ /* skip additional data */ \
+ add %rax, %rsp; \
+ /* load syscall-# */ \
+ pop %rax; \
+ /* load syscall params */ \
+ pop %rdi; \
+ pop %rsi; \
+ pop %rdx; \
+ pop %r10; \
+ pop %r8; \
+ pop %r9; \
+ /* execute syscall */ \
+ syscall; \
+ /* check return value */ \
+ pop %rcx; \
+ cmp %rcx, %rax; \
+ je 1b; \
+2: \
+ /* save return value */ \
+ mov %rax, (%rbx); \
+.section .__syscall_stub, "x"
.globl batch_syscall_stub
batch_syscall_stub:
- mov $(ASM_STUB_DATA >> 32), %rbx
- sal $32, %rbx
- mov $(ASM_STUB_DATA & 0xffffffff), %rax
- or %rax, %rbx
- /* load pointer to first operation */
- mov %rbx, %rsp
- add $0x10, %rsp
-again:
- /* load length of additional data */
- mov 0x0(%rsp), %rax
-
- /* if(length == 0) : end of list */
- /* write possible 0 to header */
- mov %rax, 8(%rbx)
- cmp $0, %rax
- jz done
-
- /* save current pointer */
- mov %rsp, 8(%rbx)
-
- /* skip additional data */
- add %rax, %rsp
-
- /* load syscall-# */
- pop %rax
+ PROCESS_LIST
+ /* stop */
+ int3
- /* load syscall params */
- pop %rdi
- pop %rsi
- pop %rdx
- pop %r10
- pop %r8
- pop %r9
+ .globl switch_mm_stub
+switch_mm_stub:
+ PROCESS_LIST
- /* execute syscall */
+ mov $__NR_switch_mm, %rax
+ mov $(ASM_STUB_DATA >> 32), %rdi
+ sal $32, %rdi
+ mov $(ASM_STUB_DATA & 0xffffffff + 4096 - 8), %rsi
+ add %rdi, %rsi
+ mov (%rsi), %rdx
+ sub $8, %rsi
+ mov (%rsi), %rdi
+ xor %rsi, %rsi
+ xor %r10, %r10
+ xor %r8, %r8
syscall
- /* check return value */
- pop %rcx
- cmp %rcx, %rax
- je again
-
-done:
- /* save return value */
- mov %rax, (%rbx)
-
- /* stop */
int3
diff --git a/arch/um/sys-x86_64/syscall_table.c b/arch/um/sys-x86_64/syscall_table.c
index 71b2ae4..c2567dd 100644
--- a/arch/um/sys-x86_64/syscall_table.c
+++ b/arch/um/sys-x86_64/syscall_table.c
@@ -33,6 +33,7 @@
#define stub_rt_sigsuspend sys_rt_sigsuspend
#define stub_sigaltstack sys_sigaltstack
#define stub_rt_sigreturn sys_rt_sigreturn
+#define stub_switch_mm sys_switch_mm
#define __SYSCALL(nr, sym) extern asmlinkage void sym(void) ;
#undef _ASM_X86_64_UNISTD_H_
diff --git a/arch/um/sys-x86_64/syscalls.c b/arch/um/sys-x86_64/syscalls.c
index 86f6b18..1d52eb5 100644
--- a/arch/um/sys-x86_64/syscalls.c
+++ b/arch/um/sys-x86_64/syscalls.c
@@ -30,7 +30,7 @@ long arch_prctl(struct task_struct *task, int code, unsigned long __user *addr)
{
unsigned long *ptr = addr, tmp;
long ret;
- int pid = task->mm->context.id.u.pid;
+ int pid = userspace_pid[0];
/*
* With ARCH_SET_FS (and ARCH_SET_GS is treated similarly to
diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
index 6ea19c2..2f74adf 100644
--- a/arch/x86/ia32/ia32_signal.c
+++ b/arch/x86/ia32/ia32_signal.c
@@ -65,6 +65,8 @@ int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
err |= __put_user(from->_sifields._pad[0], &to->_sifields._pad[0]);
switch (from->si_code >> 16) {
case __SI_FAULT >> 16:
+ err |= __put_user(from->si_trapno, &to->si_trapno);
+ err |= __put_user(from->si_error, &to->si_error);
break;
case __SI_CHLD >> 16:
err |= __put_user(from->si_utime, &to->si_utime);
diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
index df588f0..2d97495 100644
--- a/arch/x86/ia32/ia32entry.S
+++ b/arch/x86/ia32/ia32entry.S
@@ -374,6 +374,7 @@ quiet_ni_syscall:
PTREGSCALL stub32_vfork, sys_vfork, %rdi
PTREGSCALL stub32_iopl, sys_iopl, %rsi
PTREGSCALL stub32_rt_sigsuspend, sys_rt_sigsuspend, %rdx
+ PTREGSCALL stub32_switch_mm, sys_switch_mm, %r9
ENTRY(ia32_ptregs_common)
popq %r11
@@ -726,4 +727,6 @@ ia32_sys_call_table:
.quad compat_sys_timerfd
.quad sys_eventfd
.quad sys32_fallocate
+ .quad sys_new_mm /* 325 */
+ .quad stub32_switch_mm
ia32_syscall_end:
diff --git a/arch/x86/ia32/ptrace32.c b/arch/x86/ia32/ptrace32.c
index 4a233ad..5c0caa4 100644
--- a/arch/x86/ia32/ptrace32.c
+++ b/arch/x86/ia32/ptrace32.c
@@ -38,7 +38,7 @@
#define R32(l,q) \
case offsetof(struct user32, regs.l): stack[offsetof(struct pt_regs, q)/8] = val; break
-static int putreg32(struct task_struct *child, unsigned regno, u32 val)
+int putreg32(struct task_struct *child, unsigned regno, u32 val)
{
int i;
__u64 *stack = (__u64 *)task_pt_regs(child);
@@ -139,7 +139,7 @@ static int putreg32(struct task_struct *child, unsigned regno, u32 val)
#define R32(l,q) \
case offsetof(struct user32, regs.l): *val = stack[offsetof(struct pt_regs, q)/8]; break
-static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
+int getreg32(struct task_struct *child, unsigned regno, u32 *val)
{
__u64 *stack = (__u64 *)task_pt_regs(child);
@@ -248,6 +248,7 @@ asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
case PTRACE_SETOPTIONS:
case PTRACE_SET_THREAD_AREA:
case PTRACE_GET_THREAD_AREA:
+ case PTRACE_SWITCH_MM:
return sys_ptrace(request, pid, addr, data);
default:
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 3a058bb..96abdf5 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -412,6 +412,7 @@ END(\label)
PTREGSCALL stub_rt_sigsuspend, sys_rt_sigsuspend, %rdx
PTREGSCALL stub_sigaltstack, sys_sigaltstack, %rdx
PTREGSCALL stub_iopl, sys_iopl, %rsi
+ PTREGSCALL stub_switch_mm, sys_switch_mm, %r9
ENTRY(ptregscall_common)
popq %r11
diff --git a/arch/x86/kernel/ptrace_32.c b/arch/x86/kernel/ptrace_32.c
index ff5431c..1f349e3 100644
--- a/arch/x86/kernel/ptrace_32.c
+++ b/arch/x86/kernel/ptrace_32.c
@@ -83,8 +83,7 @@ static inline int put_stack_long(struct task_struct *task, int offset,
return 0;
}
-static int putreg(struct task_struct *child,
- unsigned long regno, unsigned long value)
+int putreg(struct task_struct *child, unsigned long regno, unsigned long value)
{
switch (regno >> 2) {
case GS:
@@ -116,8 +115,7 @@ static int putreg(struct task_struct *child,
return 0;
}
-static unsigned long getreg(struct task_struct *child,
- unsigned long regno)
+unsigned long getreg(struct task_struct *child, unsigned long regno)
{
unsigned long retval = ~0UL;
@@ -715,3 +713,38 @@ out:
audit_syscall_exit(AUDITSC_RESULT(regs->eax), regs->eax);
return 1;
}
+
+int ptrace_to_pt_regs(struct pt_regs *regs, struct __user user_regs *ptrace)
+{
+ int i, err;
+
+ if (!access_ok(VERIFY_READ, ptrace, sizeof(*ptrace)))
+ return -EFAULT;
+
+ for (i = 0; i < FRAME_SIZE; i++){
+ unsigned long n;
+
+ if (__get_user(n, &ptrace->regs[i]))
+ return -EFAULT;
+ err = putreg(current, i * 4, n);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+int pt_regs_to_ptrace(struct __user user_regs *ptrace, struct pt_regs *regs)
+{
+ int i;
+
+ if (!access_ok(VERIFY_WRITE, ptrace, sizeof(*ptrace)))
+ return -EFAULT;
+
+ for (i = 0; i < FRAME_SIZE; i++){
+ unsigned long n = getreg(current, i * 4), err;
+ err = __put_user(n, &ptrace->regs[i]);
+ }
+
+ return 0;
+}
diff --git a/arch/x86/kernel/ptrace_64.c b/arch/x86/kernel/ptrace_64.c
index 607085f..915c291 100644
--- a/arch/x86/kernel/ptrace_64.c
+++ b/arch/x86/kernel/ptrace_64.c
@@ -226,8 +226,7 @@ void ptrace_disable(struct task_struct *child)
clear_singlestep(child);
}
-static int putreg(struct task_struct *child,
- unsigned long regno, unsigned long value)
+int putreg(struct task_struct *child, unsigned long regno, unsigned long value)
{
unsigned long tmp;
@@ -283,7 +282,7 @@ static int putreg(struct task_struct *child,
return 0;
}
-static unsigned long getreg(struct task_struct *child, unsigned long regno)
+unsigned long getreg(struct task_struct *child, unsigned long regno)
{
unsigned long val;
switch (regno) {
@@ -619,3 +618,91 @@ asmlinkage void syscall_trace_leave(struct pt_regs *regs)
&& (current->ptrace & PT_PTRACED))
syscall_trace(regs);
}
+
+extern int putreg32(struct task_struct *child, unsigned regno, u32 val);
+
+int ptrace_to_pt_regs(struct pt_regs *regs, struct user_regs *ptrace)
+{
+ int i, err;
+
+#ifdef CONFIG_IA32_EMULATION
+ if (test_thread_flag(TIF_IA32)) {
+ for (i = 0; i < MAX_REG32_NR; i++){
+ err = putreg32(current, i * 4, ptrace->u.regs32[i]);
+ if (err)
+ return err;
+ }
+
+ return 0;
+ }
+#endif
+ for (i = 0; i < MAX_REG_NR; i++){
+ err = putreg(current, i * 8, ptrace->u.regs64[i]);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+extern int getreg32(struct task_struct *child, unsigned regno, u32 *val);
+
+int pt_regs_to_ptrace(struct __user user_regs *ptrace, struct pt_regs *regs)
+{
+ int i, err;
+
+#ifdef CONFIG_IA32_EMULATION
+ if (test_thread_flag(TIF_IA32)) {
+ if (!access_ok(VERIFY_WRITE, &ptrace->u.regs32,
+ sizeof(&ptrace->u.regs32)))
+ return -EFAULT;
+
+ for (i = 0; i < ARRAY_SIZE(ptrace->u.regs32); i++){
+ u32 n;
+
+ err = getreg32(current, i * 4, &n);
+ if (err)
+ return err;
+
+ err = __put_user(n, &ptrace->u.regs32[i]);
+ if (err)
+ return err;
+ }
+
+ return 0;
+ }
+#endif
+ if (!access_ok(VERIFY_WRITE, &ptrace->u.regs64,
+ sizeof(ptrace->u.regs64)))
+ return -EFAULT;
+
+ for (i = 0; i < ARRAY_SIZE(ptrace->u.regs64); i++){
+ unsigned long n = getreg(current, i * 8);
+ err = __put_user(n, &ptrace->u.regs64[i]);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+#define RIP_INDEX (128 / sizeof(long))
+#define RSP_INDEX (152 / sizeof(long))
+
+unsigned long ptrace_ip(struct user_regs *regs)
+{
+#ifdef CONFIG_IA32_EMULATION
+ if (test_thread_flag(TIF_IA32))
+ return ptrace_ip32(regs->u.regs32);
+#endif
+ return regs->u.regs64[RIP_INDEX];
+}
+
+unsigned long ptrace_sp(struct user_regs *regs)
+{
+#ifdef CONFIG_IA32_EMULATION
+ if (test_thread_flag(TIF_IA32))
+ return ptrace_sp32(regs->u.regs32);
+#endif
+ return regs->u.regs64[RSP_INDEX];
+}
diff --git a/arch/x86/kernel/sys_i386_32.c b/arch/x86/kernel/sys_i386_32.c
index a86d26f..1953ffb 100644
--- a/arch/x86/kernel/sys_i386_32.c
+++ b/arch/x86/kernel/sys_i386_32.c
@@ -261,3 +261,14 @@ int kernel_execve(const char *filename, char *const argv[], char *const envp[])
: "0" (__NR_execve),"ri" (filename),"c" (argv), "d" (envp) : "memory");
return __res;
}
+
+extern long do_switch_mm(int fd, struct __user user_regs *save,
+ struct __user user_regs *new, unsigned long ip,
+ unsigned long sp, struct pt_regs *regs);
+
+asmlinkage long sys_switch_mm(struct pt_regs regs)
+{
+ return do_switch_mm(regs.ebx, (struct __user user_regs *) regs.ecx,
+ (struct __user user_regs *) regs.edx, regs.esi,
+ regs.edi, ®s);
+}
diff --git a/arch/x86/kernel/sys_x86_64.c b/arch/x86/kernel/sys_x86_64.c
index 907942e..80a0175 100644
--- a/arch/x86/kernel/sys_x86_64.c
+++ b/arch/x86/kernel/sys_x86_64.c
@@ -153,3 +153,14 @@ asmlinkage long sys_uname(struct new_utsname __user * name)
err |= copy_to_user(&name->machine, "i686", 5);
return err ? -EFAULT : 0;
}
+
+extern long do_switch_mm(int fd, struct __user user_regs *save,
+ struct __user user_regs *new, unsigned long ip,
+ unsigned long sp, struct pt_regs *regs);
+
+asmlinkage long sys_switch_mm(int fd, struct __user user_regs *save,
+ struct __user user_regs *new, unsigned long ip,
+ unsigned long sp, struct pt_regs *regs)
+{
+ return do_switch_mm(fd, save, new, ip, sp, regs);
+}
diff --git a/arch/x86/kernel/syscall_table_32.S b/arch/x86/kernel/syscall_table_32.S
index 8344c70..3346997 100644
--- a/arch/x86/kernel/syscall_table_32.S
+++ b/arch/x86/kernel/syscall_table_32.S
@@ -324,3 +324,5 @@ ENTRY(sys_call_table)
.long sys_timerfd
.long sys_eventfd
.long sys_fallocate
+ .long sys_new_mm
+ .long sys_switch_mm
diff --git a/arch/x86/mm/fault_32.c b/arch/x86/mm/fault_32.c
index a2273d4..0e7940d 100644
--- a/arch/x86/mm/fault_32.c
+++ b/arch/x86/mm/fault_32.c
@@ -211,6 +211,8 @@ static noinline void force_sig_info_fault(int si_signo, int si_code,
info.si_errno = 0;
info.si_code = si_code;
info.si_addr = (void __user *)address;
+ info.si_trapno = tsk->thread.trap_no;
+ info.si_error = tsk->thread.error_code;
force_sig_info(si_signo, &info, tsk);
}
diff --git a/arch/x86/mm/fault_64.c b/arch/x86/mm/fault_64.c
index 0e26230..9f5009e 100644
--- a/arch/x86/mm/fault_64.c
+++ b/arch/x86/mm/fault_64.c
@@ -501,6 +501,8 @@ bad_area_nosemaphore:
info.si_signo = SIGSEGV;
info.si_errno = 0;
/* info.si_code has been set above */
+ info.si_trapno = tsk->thread.trap_no;
+ info.si_error = tsk->thread.error_code;
info.si_addr = (void __user *)address;
force_sig_info(SIGSEGV, &info, tsk);
return;
@@ -576,6 +578,8 @@ do_sigbus:
info.si_signo = SIGBUS;
info.si_errno = 0;
info.si_code = BUS_ADRERR;
+ info.si_trapno = tsk->thread.trap_no;
+ info.si_error = tsk->thread.error_code;
info.si_addr = (void __user *)address;
force_sig_info(SIGBUS, &info, tsk);
return;
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 7411bfb..6dd8e34 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2187,6 +2187,34 @@ static int proc_pid_io_accounting(struct task_struct *task, char *buffer)
}
#endif
+static int proc_pid_mm_open(struct inode *inode, struct file *file)
+{
+ struct task_struct *task = pid_task(proc_pid(inode), PIDTYPE_PID);
+
+ if (task == NULL)
+ return -ENOENT;
+
+ if(task->mm != NULL)
+ atomic_inc(&task->mm->mm_users);
+ file->private_data = task->mm;
+ return 0;
+}
+
+static int proc_pid_mm_release(struct inode *inode, struct file *file)
+{
+ struct mm_struct *mm = file->private_data;
+
+ if(mm != NULL)
+ mmput(mm);
+
+ return 0;
+}
+
+const struct file_operations proc_pid_mm_operations = {
+ .open = proc_pid_mm_open,
+ .release = proc_pid_mm_release,
+};
+
/*
* Thread groups
*/
@@ -2250,6 +2278,7 @@ static const struct pid_entry tgid_base_stuff[] = {
#ifdef CONFIG_TASK_IO_ACCOUNTING
INF("io", S_IRUGO, pid_io_accounting),
#endif
+ REG("mm", S_IRUSR | S_IWUSR, pid_mm),
};
static int proc_tgid_base_readdir(struct file * filp,
diff --git a/include/asm-generic/siginfo.h b/include/asm-generic/siginfo.h
index 8786e01..b295e86 100644
--- a/include/asm-generic/siginfo.h
+++ b/include/asm-generic/siginfo.h
@@ -82,6 +82,9 @@ typedef struct siginfo {
#ifdef __ARCH_SI_TRAPNO
int _trapno; /* TRAP # which caused the signal */
#endif
+#ifdef __ARCH_SI_ERROR
+ int _error; /* CPU error code */
+#endif
} _sigfault;
/* SIGPOLL */
@@ -112,6 +115,9 @@ typedef struct siginfo {
#ifdef __ARCH_SI_TRAPNO
#define si_trapno _sifields._sigfault._trapno
#endif
+#ifdef __ARCH_SI_ERROR
+#define si_error _sifields._sigfault._error
+#endif
#define si_band _sifields._sigpoll._band
#define si_fd _sifields._sigpoll._fd
diff --git a/include/asm-um/processor-x86_64.h b/include/asm-um/processor-x86_64.h
index d946bf2..0528d9e 100644
--- a/include/asm-um/processor-x86_64.h
+++ b/include/asm-um/processor-x86_64.h
@@ -37,6 +37,7 @@ static inline void arch_flush_thread(struct arch_thread *thread)
static inline void arch_copy_thread(struct arch_thread *from,
struct arch_thread *to)
{
+ to->fs = from->fs;
}
#include "asm/arch/user.h"
diff --git a/include/asm-um/ptrace-generic.h b/include/asm-um/ptrace-generic.h
index 6aefcd3..86dc84c 100644
--- a/include/asm-um/ptrace-generic.h
+++ b/include/asm-um/ptrace-generic.h
@@ -34,6 +34,14 @@ struct pt_regs {
#define instruction_pointer(regs) PT_REGS_IP(regs)
+struct user_regs {
+ unsigned long regs[MAX_REG_NR];
+};
+
+extern int copyin_user_regs(struct user_regs *to, unsigned long __user *from);
+extern int ptrace_to_pt_regs(struct pt_regs *to, struct user_regs __user *from);
+extern int pt_regs_to_ptrace(struct user_regs __user *to, struct pt_regs *from);
+
struct task_struct;
extern long subarch_ptrace(struct task_struct *child, long request, long addr,
diff --git a/include/asm-um/ptrace-i386.h b/include/asm-um/ptrace-i386.h
index b2d24c5..9bec151 100644
--- a/include/asm-um/ptrace-i386.h
+++ b/include/asm-um/ptrace-i386.h
@@ -40,6 +40,12 @@
#define user_mode(r) UPT_IS_USER(&(r)->regs)
+#define pt_regs_ip(r) (r).regs.gp[EIP]
+#define pt_regs_sp(r) (r).regs.gp[UESP]
+
+#define ptrace_ip(r) (r)->regs[EIP]
+#define ptrace_sp(r) (r)->regs[UESP]
+
/*
* Forward declaration to avoid including sysdep/tls.h, which causes a
* circular include, and compilation failures.
diff --git a/include/asm-um/ptrace-x86_64.h b/include/asm-um/ptrace-x86_64.h
index 4c47535..9c5365e 100644
--- a/include/asm-um/ptrace-x86_64.h
+++ b/include/asm-um/ptrace-x86_64.h
@@ -62,6 +62,12 @@
#define PT_FIX_EXEC_STACK(sp) do ; while(0)
+#define pt_regs_ip(r) (r).regs.gp[RIP / sizeof(long)]
+#define pt_regs_sp(r) (r).regs.gp[RSP / sizeof(long)]
+
+#define ptrace_ip(r) (r)->regs[RIP / sizeof(long)]
+#define ptrace_sp(r) (r)->regs[RSP / sizeof(long)]
+
#define profile_pc(regs) PT_REGS_IP(regs)
static inline int ptrace_get_thread_area(struct task_struct *child, int idx,
diff --git a/include/asm-x86/ia32.h b/include/asm-x86/ia32.h
index 0190b7c..afc75c3 100644
--- a/include/asm-x86/ia32.h
+++ b/include/asm-x86/ia32.h
@@ -119,6 +119,8 @@ typedef struct compat_siginfo{
/* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
struct {
unsigned int _addr; /* faulting insn/memory ref. */
+ int _trapno; /* TRAP # which caused the signal */
+ int _error; /* CPU error code */
} _sigfault;
/* SIGPOLL */
diff --git a/include/asm-x86/ptrace.h b/include/asm-x86/ptrace.h
index 51ddb25..379b891 100644
--- a/include/asm-x86/ptrace.h
+++ b/include/asm-x86/ptrace.h
@@ -2,6 +2,7 @@
#define _ASM_X86_PTRACE_H
#include <linux/compiler.h> /* For __user */
+#include <asm/user.h>
#include <asm/ptrace-abi.h>
#ifndef __ASSEMBLY__
@@ -32,6 +33,21 @@ struct pt_regs {
#ifdef __KERNEL__
+struct user_regs {
+ unsigned long regs[FRAME_SIZE];
+};
+
+#define pt_regs_ip(r) (r).eip
+#define pt_regs_sp(r) (r).esp
+
+#define ptrace_ip(r) (r)->regs[EIP]
+#define ptrace_sp(r) (r)->regs[UESP]
+
+extern int ptrace_to_pt_regs(struct pt_regs *regs,
+ struct user_regs __user *ptrace);
+extern int pt_regs_to_ptrace(struct __user user_regs *ptrace,
+ struct pt_regs *regs);
+
#include <asm/vm86.h>
#include <asm/segment.h>
@@ -98,6 +114,39 @@ struct pt_regs {
#ifdef __KERNEL__
+#ifdef CONFIG_IA32_EMULATION
+#define MAX_REG32_NR 17
+
+#define EIP 12
+#define UESP 15
+
+#define ptrace_ip32(regs) (unsigned long) (regs)[EIP]
+#define ptrace_sp32(regs) (unsigned long) (regs)[UESP]
+
+#endif
+
+#define MAX_REG_NR (sizeof(struct user_regs_struct) / sizeof(long))
+
+struct user_regs {
+ union {
+ unsigned long regs64[MAX_REG_NR];
+#ifdef CONFIG_IA32_EMULATION
+ u32 regs32[MAX_REG32_NR];
+#endif
+ } u;
+};
+
+#define pt_regs_ip(regs) (regs).rip
+#define pt_regs_sp(regs) (regs).rsp
+
+extern unsigned long ptrace_ip(struct user_regs *regs);
+extern unsigned long ptrace_sp(struct user_regs *regs);
+
+extern int ptrace_to_pt_regs(struct pt_regs *regs,
+ struct user_regs __user *ptrace);
+extern int pt_regs_to_ptrace(struct __user user_regs *ptrace,
+ struct pt_regs *regs);
+
#define user_mode(regs) (!!((regs)->cs & 3))
#define user_mode_vm(regs) user_mode(regs)
#define instruction_pointer(regs) ((regs)->rip)
diff --git a/include/asm-x86/siginfo.h b/include/asm-x86/siginfo.h
index a477bea..59c8d37 100644
--- a/include/asm-x86/siginfo.h
+++ b/include/asm-x86/siginfo.h
@@ -5,6 +5,9 @@
# define __ARCH_SI_PREAMBLE_SIZE (4 * sizeof(int))
#endif
+#define __ARCH_SI_TRAPNO
+#define __ARCH_SI_ERROR
+
#include <asm-generic/siginfo.h>
#endif
diff --git a/include/asm-x86/unistd_32.h b/include/asm-x86/unistd_32.h
index 9b15545..87221d1 100644
--- a/include/asm-x86/unistd_32.h
+++ b/include/asm-x86/unistd_32.h
@@ -330,6 +330,8 @@
#define __NR_timerfd 322
#define __NR_eventfd 323
#define __NR_fallocate 324
+#define __NR_new_mm 325
+#define __NR_switch_mm 326
#ifdef __KERNEL__
diff --git a/include/asm-x86/unistd_64.h b/include/asm-x86/unistd_64.h
index 5ff4d3e..baf4c0c 100644
--- a/include/asm-x86/unistd_64.h
+++ b/include/asm-x86/unistd_64.h
@@ -635,6 +635,10 @@ __SYSCALL(__NR_timerfd, sys_timerfd)
__SYSCALL(__NR_eventfd, sys_eventfd)
#define __NR_fallocate 285
__SYSCALL(__NR_fallocate, sys_fallocate)
+#define __NR_new_mm 286
+__SYSCALL(__NR_new_mm, sys_new_mm)
+#define __NR_switch_mm 287
+__SYSCALL(__NR_switch_mm, stub_switch_mm)
#ifndef __NO_STUBS
#define __ARCH_WANT_OLD_READDIR
diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h
index 3ea5750..6758e86 100644
--- a/include/linux/ptrace.h
+++ b/include/linux/ptrace.h
@@ -21,6 +21,8 @@
#define PTRACE_SYSCALL 24
+#define PTRACE_SWITCH_MM 33
+
/* 0x4200-0x4300 are reserved for architecture-independent additions. */
#define PTRACE_SETOPTIONS 0x4200
#define PTRACE_GETEVENTMSG 0x4201
diff --git a/include/linux/sched.h b/include/linux/sched.h
index cc14656..9d11cca 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1652,6 +1652,7 @@ static inline int sas_ss_flags(unsigned long sp)
* Routines for handling mm_structs
*/
extern struct mm_struct * mm_alloc(void);
+extern struct mm_struct *dup_mm(struct task_struct *tsk);
/* mmdrop drops the mm and the page tables */
extern void FASTCALL(__mmdrop(struct mm_struct *));
diff --git a/include/linux/signalfd.h b/include/linux/signalfd.h
index 86f9b1e..71e3c45 100644
--- a/include/linux/signalfd.h
+++ b/include/linux/signalfd.h
@@ -26,6 +26,8 @@ struct signalfd_siginfo {
__u64 ssi_utime;
__u64 ssi_stime;
__u64 ssi_addr;
+ __u32 ssi_trap_no;
+ __u32 ssi_error_code;
/*
* Pad strcture to 128 bytes. Remember to update the
@@ -36,7 +38,7 @@ struct signalfd_siginfo {
* comes out of a read(2) and we really don't want to have
* a compat on read(2).
*/
- __u8 __pad[48];
+ __u8 __pad[40];
};
diff --git a/kernel/fork.c b/kernel/fork.c
index 8dd8ff2..bd9afde 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -491,7 +491,7 @@ void mm_release(struct task_struct *tsk, struct mm_struct *mm)
* Allocate a new mm structure and copy contents from the
* mm structure of the passed in task structure.
*/
-static struct mm_struct *dup_mm(struct task_struct *tsk)
+struct mm_struct *dup_mm(struct task_struct *tsk)
{
struct mm_struct *mm, *oldmm = current->mm;
int err;
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index c25db86..2f5cec0 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -366,6 +366,8 @@ static int ptrace_setsiginfo(struct task_struct *child, siginfo_t __user * data)
return error;
}
+extern int do_switch(struct task_struct *task, int fd);
+
int ptrace_request(struct task_struct *child, long request,
long addr, long data)
{
@@ -390,6 +392,9 @@ int ptrace_request(struct task_struct *child, long request,
case PTRACE_DETACH: /* detach a process that was attached. */
ret = ptrace_detach(child, data);
break;
+ case PTRACE_SWITCH_MM:
+ ret = do_switch(child, data);
+ break;
default:
break;
}
diff --git a/kernel/signal.c b/kernel/signal.c
index afa4f78..28813b1 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2088,7 +2088,7 @@ int copy_siginfo_to_user(siginfo_t __user *to, siginfo_t *from)
*/
err = __put_user(from->si_signo, &to->si_signo);
err |= __put_user(from->si_errno, &to->si_errno);
- err |= __put_user((short)from->si_code, &to->si_code);
+ err |= __put_user(from->si_code, &to->si_code);
switch (from->si_code & __SI_MASK) {
case __SI_KILL:
err |= __put_user(from->si_pid, &to->si_pid);
@@ -2108,6 +2108,9 @@ int copy_siginfo_to_user(siginfo_t __user *to, siginfo_t *from)
#ifdef __ARCH_SI_TRAPNO
err |= __put_user(from->si_trapno, &to->si_trapno);
#endif
+#ifdef __ARCH_SI_ERROR
+ err |= __put_user(from->si_error, &to->si_error);
+#endif
break;
case __SI_CHLD:
err |= __put_user(from->si_pid, &to->si_pid);
diff --git a/mm/Makefile b/mm/Makefile
index 5c0b0ea..9351c4e 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -4,8 +4,8 @@
mmu-y := nommu.o
mmu-$(CONFIG_MMU) := fremap.o highmem.o madvise.o memory.o mincore.o \
- mlock.o mmap.o mprotect.o mremap.o msync.o rmap.o \
- vmalloc.o
+ mlock.o mmap.o mmfs.o mprotect.o mremap.o msync.o \
+ rmap.o vmalloc.o
obj-y := bootmem.o filemap.o mempool.o oom_kill.o fadvise.o \
page_alloc.o page-writeback.o pdflush.o \
diff --git a/mm/mmfs.c b/mm/mmfs.c
new file mode 100644
index 0000000..12ac235
--- /dev/null
+++ b/mm/mmfs.c
@@ -0,0 +1,210 @@
+#define __FRAME_OFFSETS
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/mount.h>
+#include <linux/sched.h>
+#include <asm/mmu_context.h>
+#include <asm/ptrace.h>
+#include <asm/uaccess.h>
+#include <asm/user.h>
+
+static int release_mm(struct inode *inode, struct file *file)
+{
+ struct mm_struct *mm = file->private_data;
+
+ mmput(mm);
+ return 0;
+}
+
+#define MM_MAGIC 0xE0AAC500
+
+static int mm_get_sb(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data,
+ struct vfsmount *mnt)
+{
+ return get_sb_pseudo(fs_type, "mm:", NULL, MM_MAGIC, mnt);
+}
+
+static struct vfsmount *mm_mnt;
+
+static struct file_system_type mm_fs_type = {
+ .name = "mm",
+ .get_sb = mm_get_sb,
+ .kill_sb = kill_anon_super,
+};
+
+static int __init init_mm_fs(void)
+{
+ int err;
+
+ err = register_filesystem(&mm_fs_type);
+ if (err)
+ return err;
+
+ mm_mnt = kern_mount(&mm_fs_type);
+ if (IS_ERR(mm_mnt)) {
+ err = PTR_ERR(mm_mnt);
+ unregister_filesystem(&mm_fs_type);
+ }
+
+ return err;
+}
+
+static void __exit exit_mm_fs(void)
+{
+ unregister_filesystem(&mm_fs_type);
+ mntput(mm_mnt);
+}
+
+fs_initcall(init_mm_fs);
+module_exit(exit_mm_fs);
+
+static int mm_delete_dentry(struct dentry *dentry)
+{
+ /*
+ * At creation time, we pretended this dentry was hashed
+ * (by clearing DCACHE_UNHASHED bit in d_flags)
+ * At delete time, we restore the truth : not hashed.
+ * (so that dput() can proceed correctly)
+ */
+ dentry->d_flags |= DCACHE_UNHASHED;
+ return 0;
+}
+
+/*
+ * pipefs_dname() is called from d_path().
+ */
+static char *mm_dname(struct dentry *dentry, char *buffer, int buflen)
+{
+ return dynamic_dname(dentry, buffer, buflen, "mm:[%lu]",
+ dentry->d_inode->i_ino);
+}
+
+static struct dentry_operations mm_dentry_operations = {
+ .d_delete = mm_delete_dentry,
+ .d_dname = mm_dname,
+};
+
+static struct file_operations mm_fops = {
+ .release = release_mm,
+};
+
+asmlinkage long sys_new_mm(void)
+{
+ struct file *file;
+ struct mm_struct *mm;
+ struct inode *inode;
+ struct dentry *dentry;
+ struct qstr name = { .name = "" };
+ int err, fd;
+
+ mm = dup_mm(current);
+ if (mm == NULL)
+ return -ENOMEM;
+
+ fd = get_unused_fd();
+ if (fd < 0) {
+ err = fd;
+ goto out_free;
+ }
+
+ err = -ENOMEM;
+ dentry = d_alloc(mm_mnt->mnt_sb->s_root, &name);
+ if (dentry == NULL)
+ goto out_put;
+
+ dentry->d_op = &mm_dentry_operations;
+ dentry->d_flags &= ~DCACHE_UNHASHED;
+
+ inode = new_inode(mm_mnt->mnt_sb);
+ if (inode == NULL)
+ goto out_dput;
+
+ inode->i_mode = S_IRUSR;
+ inode->i_uid = current->fsuid;
+ inode->i_gid = current->fsgid;
+ inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+
+ d_instantiate(dentry, inode);
+
+ file = alloc_file(mm_mnt, dentry, FMODE_READ, &mm_fops);
+ if (file == NULL)
+ goto out_dput;
+
+ file->f_flags = O_RDONLY;
+ file->private_data = mm;
+
+ fd_install(fd, file);
+
+ return fd;
+
+ out_dput:
+ dput(dentry);
+ out_put:
+ put_unused_fd(fd);
+ out_free:
+ mmput(mm);
+ return err;
+}
+
+extern const struct file_operations proc_pid_mm_operations;
+
+int do_switch(struct task_struct *task, int fd)
+{
+ struct mm_struct *old = task->mm, *new;
+ struct file *file = fget(fd);
+ int err;
+
+ if (!file)
+ return -EBADF;
+
+ err = -EINVAL;
+ if ((file->f_op != &mm_fops) && (file->f_op != &proc_pid_mm_operations))
+ goto out;
+
+ new = file->private_data;
+
+ task_lock(task);
+
+ atomic_inc(&new->mm_users);
+ task->mm = new;
+ task->active_mm = new;
+
+ if(task == current)
+ switch_mm(old, task->mm, task);
+
+ task_unlock(task);
+
+ mmput(old);
+ err = 0;
+
+ out:
+ fput(file);
+ return err;
+}
+
+long do_switch_mm(int fd, struct __user user_regs *save,
+ struct __user user_regs *new, unsigned long ip,
+ unsigned long sp, struct pt_regs *regs)
+{
+ int ret;
+
+ if (current->mm == NULL)
+ return -EINVAL;
+
+ if ((save != NULL) && pt_regs_to_ptrace(save, regs))
+ return -EFAULT;
+
+ ret = do_switch(current, fd);
+ if (ret)
+ return ret;
+
+ if (new != NULL)
+ ret = ptrace_to_pt_regs(regs, new);
+ else {
+ pt_regs_ip(*regs) = ip;
+ pt_regs_sp(*regs) = sp;
+ }
+
+ return ret;
+}
