#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/regset.h>
+#include <linux/tracehook.h>
#include <linux/user.h>
#include <linux/elf.h>
#include <linux/security.h>
REGSET_GENERAL,
REGSET_FP,
REGSET_XFP,
+ REGSET_IOPERM64 = REGSET_XFP,
REGSET_TLS,
+ REGSET_IOPERM32,
};
/*
#define FLAG_MASK FLAG_MASK_32
-static long *pt_regs_access(struct pt_regs *regs, unsigned long regno)
+static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno)
{
BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0);
- regno >>= 2;
- if (regno > FS)
- --regno;
- return ®s->bx + regno;
+ return ®s->bx + (regno >> 2);
}
static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
if (offset != offsetof(struct user_regs_struct, gs))
retval = *pt_regs_access(task_pt_regs(task), offset);
else {
- retval = task->thread.gs;
if (task == current)
- savesegment(gs, retval);
+ retval = get_user_gs(task_pt_regs(task));
+ else
+ retval = task_user_gs(task);
}
return retval;
}
break;
case offsetof(struct user_regs_struct, gs):
- task->thread.gs = value;
if (task == current)
- /*
- * The user-mode %gs is not affected by
- * kernel entry, so we must update the CPU.
- */
- loadsegment(gs, value);
+ set_user_gs(task_pt_regs(task), value);
+ else
+ task_user_gs(task) = value;
}
return 0;
return 0;
}
-#ifdef X86_BTS
+/*
+ * These access the current or another (stopped) task's io permission
+ * bitmap for debugging or core dump.
+ */
+static int ioperm_active(struct task_struct *target,
+ const struct user_regset *regset)
+{
+ return target->thread.io_bitmap_max / regset->size;
+}
-static int ptrace_bts_get_size(struct task_struct *child)
+static int ioperm_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
{
- if (!child->thread.ds_area_msr)
+ if (!target->thread.io_bitmap_ptr)
return -ENXIO;
- return ds_get_bts_index((void *)child->thread.ds_area_msr);
+ return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ target->thread.io_bitmap_ptr,
+ 0, IO_BITMAP_BYTES);
}
-static int ptrace_bts_read_record(struct task_struct *child,
- long index,
+#ifdef CONFIG_X86_PTRACE_BTS
+static int ptrace_bts_read_record(struct task_struct *child, size_t index,
struct bts_struct __user *out)
{
- struct bts_struct ret;
- int retval;
- int bts_end;
- int bts_index;
-
- if (!child->thread.ds_area_msr)
- return -ENXIO;
+ const struct bts_trace *trace;
+ struct bts_struct bts;
+ const unsigned char *at;
+ int error;
- if (index < 0)
- return -EINVAL;
+ trace = ds_read_bts(child->bts);
+ if (!trace)
+ return -EPERM;
- bts_end = ds_get_bts_end((void *)child->thread.ds_area_msr);
- if (bts_end <= index)
- return -EINVAL;
+ at = trace->ds.top - ((index + 1) * trace->ds.size);
+ if ((void *)at < trace->ds.begin)
+ at += (trace->ds.n * trace->ds.size);
- /* translate the ptrace bts index into the ds bts index */
- bts_index = ds_get_bts_index((void *)child->thread.ds_area_msr);
- bts_index -= (index + 1);
- if (bts_index < 0)
- bts_index += bts_end;
+ if (!trace->read)
+ return -EOPNOTSUPP;
- retval = ds_read_bts((void *)child->thread.ds_area_msr,
- bts_index, &ret);
- if (retval < 0)
- return retval;
+ error = trace->read(child->bts, at, &bts);
+ if (error < 0)
+ return error;
- if (copy_to_user(out, &ret, sizeof(ret)))
+ if (copy_to_user(out, &bts, sizeof(bts)))
return -EFAULT;
- return sizeof(ret);
-}
-
-static int ptrace_bts_clear(struct task_struct *child)
-{
- if (!child->thread.ds_area_msr)
- return -ENXIO;
-
- return ds_clear((void *)child->thread.ds_area_msr);
+ return sizeof(bts);
}
static int ptrace_bts_drain(struct task_struct *child,
long size,
struct bts_struct __user *out)
{
- int end, i;
- void *ds = (void *)child->thread.ds_area_msr;
+ const struct bts_trace *trace;
+ const unsigned char *at;
+ int error, drained = 0;
- if (!ds)
- return -ENXIO;
+ trace = ds_read_bts(child->bts);
+ if (!trace)
+ return -EPERM;
- end = ds_get_bts_index(ds);
- if (end <= 0)
- return end;
+ if (!trace->read)
+ return -EOPNOTSUPP;
- if (size < (end * sizeof(struct bts_struct)))
+ if (size < (trace->ds.top - trace->ds.begin))
return -EIO;
- for (i = 0; i < end; i++, out++) {
- struct bts_struct ret;
- int retval;
+ for (at = trace->ds.begin; (void *)at < trace->ds.top;
+ out++, drained++, at += trace->ds.size) {
+ struct bts_struct bts;
+ int error;
- retval = ds_read_bts(ds, i, &ret);
- if (retval < 0)
- return retval;
+ error = trace->read(child->bts, at, &bts);
+ if (error < 0)
+ return error;
- if (copy_to_user(out, &ret, sizeof(ret)))
+ if (copy_to_user(out, &bts, sizeof(bts)))
return -EFAULT;
}
- ds_clear(ds);
+ memset(trace->ds.begin, 0, trace->ds.n * trace->ds.size);
+
+ error = ds_reset_bts(child->bts);
+ if (error < 0)
+ return error;
+
+ return drained;
+}
+
+static int ptrace_bts_allocate_buffer(struct task_struct *child, size_t size)
+{
+ child->bts_buffer = alloc_locked_buffer(size);
+ if (!child->bts_buffer)
+ return -ENOMEM;
- return end;
+ child->bts_size = size;
+
+ return 0;
+}
+
+static void ptrace_bts_free_buffer(struct task_struct *child)
+{
+ free_locked_buffer(child->bts_buffer, child->bts_size);
+ child->bts_buffer = NULL;
+ child->bts_size = 0;
}
static int ptrace_bts_config(struct task_struct *child,
const struct ptrace_bts_config __user *ucfg)
{
struct ptrace_bts_config cfg;
- int bts_size, ret = 0;
- void *ds;
+ unsigned int flags = 0;
if (cfg_size < sizeof(cfg))
return -EIO;
if (copy_from_user(&cfg, ucfg, sizeof(cfg)))
return -EFAULT;
- if ((int)cfg.size < 0)
- return -EINVAL;
-
- bts_size = 0;
- ds = (void *)child->thread.ds_area_msr;
- if (ds) {
- bts_size = ds_get_bts_size(ds);
- if (bts_size < 0)
- return bts_size;
+ if (child->bts) {
+ ds_release_bts(child->bts);
+ child->bts = NULL;
}
- cfg.size = PAGE_ALIGN(cfg.size);
- if (bts_size != cfg.size) {
- ret = ptrace_bts_realloc(child, cfg.size,
- cfg.flags & PTRACE_BTS_O_CUT_SIZE);
- if (ret < 0)
- goto errout;
+ if (cfg.flags & PTRACE_BTS_O_SIGNAL) {
+ if (!cfg.signal)
+ return -EINVAL;
- ds = (void *)child->thread.ds_area_msr;
+ return -EOPNOTSUPP;
+
+ child->thread.bts_ovfl_signal = cfg.signal;
}
- if (cfg.flags & PTRACE_BTS_O_SIGNAL)
- ret = ds_set_overflow(ds, DS_O_SIGNAL);
- else
- ret = ds_set_overflow(ds, DS_O_WRAP);
- if (ret < 0)
- goto errout;
+ if ((cfg.flags & PTRACE_BTS_O_ALLOC) &&
+ (cfg.size != child->bts_size)) {
+ int error;
+
+ ptrace_bts_free_buffer(child);
+
+ error = ptrace_bts_allocate_buffer(child, cfg.size);
+ if (error < 0)
+ return error;
+ }
if (cfg.flags & PTRACE_BTS_O_TRACE)
- child->thread.debugctlmsr |= ds_debugctl_mask();
- else
- child->thread.debugctlmsr &= ~ds_debugctl_mask();
+ flags |= BTS_USER;
if (cfg.flags & PTRACE_BTS_O_SCHED)
- set_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
- else
- clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
+ flags |= BTS_TIMESTAMPS;
- ret = sizeof(cfg);
+ child->bts = ds_request_bts(child, child->bts_buffer, child->bts_size,
+ /* ovfl = */ NULL, /* th = */ (size_t)-1,
+ flags);
+ if (IS_ERR(child->bts)) {
+ int error = PTR_ERR(child->bts);
-out:
- if (child->thread.debugctlmsr)
- set_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
- else
- clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
+ ptrace_bts_free_buffer(child);
+ child->bts = NULL;
- return ret;
+ return error;
+ }
-errout:
- child->thread.debugctlmsr &= ~ds_debugctl_mask();
- clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
- goto out;
+ return sizeof(cfg);
}
static int ptrace_bts_status(struct task_struct *child,
long cfg_size,
struct ptrace_bts_config __user *ucfg)
{
- void *ds = (void *)child->thread.ds_area_msr;
+ const struct bts_trace *trace;
struct ptrace_bts_config cfg;
if (cfg_size < sizeof(cfg))
return -EIO;
- memset(&cfg, 0, sizeof(cfg));
-
- if (ds) {
- cfg.size = ds_get_bts_size(ds);
+ trace = ds_read_bts(child->bts);
+ if (!trace)
+ return -EPERM;
- if (ds_get_overflow(ds) == DS_O_SIGNAL)
- cfg.flags |= PTRACE_BTS_O_SIGNAL;
+ memset(&cfg, 0, sizeof(cfg));
+ cfg.size = trace->ds.end - trace->ds.begin;
+ cfg.signal = child->thread.bts_ovfl_signal;
+ cfg.bts_size = sizeof(struct bts_struct);
- if (test_tsk_thread_flag(child, TIF_DEBUGCTLMSR) &&
- child->thread.debugctlmsr & ds_debugctl_mask())
- cfg.flags |= PTRACE_BTS_O_TRACE;
+ if (cfg.signal)
+ cfg.flags |= PTRACE_BTS_O_SIGNAL;
- if (test_tsk_thread_flag(child, TIF_BTS_TRACE_TS))
- cfg.flags |= PTRACE_BTS_O_SCHED;
- }
+ if (trace->ds.flags & BTS_USER)
+ cfg.flags |= PTRACE_BTS_O_TRACE;
- cfg.bts_size = sizeof(struct bts_struct);
+ if (trace->ds.flags & BTS_TIMESTAMPS)
+ cfg.flags |= PTRACE_BTS_O_SCHED;
if (copy_to_user(ucfg, &cfg, sizeof(cfg)))
return -EFAULT;
return sizeof(cfg);
}
-
-static int ptrace_bts_write_record(struct task_struct *child,
- const struct bts_struct *in)
+static int ptrace_bts_clear(struct task_struct *child)
{
- int retval;
+ const struct bts_trace *trace;
- if (!child->thread.ds_area_msr)
- return -ENXIO;
+ trace = ds_read_bts(child->bts);
+ if (!trace)
+ return -EPERM;
- retval = ds_write_bts((void *)child->thread.ds_area_msr, in);
- if (retval)
- return retval;
+ memset(trace->ds.begin, 0, trace->ds.n * trace->ds.size);
- return sizeof(*in);
+ return ds_reset_bts(child->bts);
}
-static int ptrace_bts_realloc(struct task_struct *child,
- int size, int reduce_size)
+static int ptrace_bts_size(struct task_struct *child)
{
- unsigned long rlim, vm;
- int ret, old_size;
-
- if (size < 0)
- return -EINVAL;
+ const struct bts_trace *trace;
- old_size = ds_get_bts_size((void *)child->thread.ds_area_msr);
- if (old_size < 0)
- return old_size;
-
- ret = ds_free((void **)&child->thread.ds_area_msr);
- if (ret < 0)
- goto out;
-
- size >>= PAGE_SHIFT;
- old_size >>= PAGE_SHIFT;
-
- current->mm->total_vm -= old_size;
- current->mm->locked_vm -= old_size;
-
- if (size == 0)
- goto out;
-
- rlim = current->signal->rlim[RLIMIT_AS].rlim_cur >> PAGE_SHIFT;
- vm = current->mm->total_vm + size;
- if (rlim < vm) {
- ret = -ENOMEM;
-
- if (!reduce_size)
- goto out;
-
- size = rlim - current->mm->total_vm;
- if (size <= 0)
- goto out;
- }
+ trace = ds_read_bts(child->bts);
+ if (!trace)
+ return -EPERM;
- rlim = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur >> PAGE_SHIFT;
- vm = current->mm->locked_vm + size;
- if (rlim < vm) {
- ret = -ENOMEM;
+ return (trace->ds.top - trace->ds.begin) / trace->ds.size;
+}
- if (!reduce_size)
- goto out;
+static void ptrace_bts_fork(struct task_struct *tsk)
+{
+ tsk->bts = NULL;
+ tsk->bts_buffer = NULL;
+ tsk->bts_size = 0;
+ tsk->thread.bts_ovfl_signal = 0;
+}
- size = rlim - current->mm->locked_vm;
- if (size <= 0)
- goto out;
+static void ptrace_bts_untrace(struct task_struct *child)
+{
+ if (unlikely(child->bts)) {
+ ds_release_bts(child->bts);
+ child->bts = NULL;
+
+ /* We cannot update total_vm and locked_vm since
+ child's mm is already gone. But we can reclaim the
+ memory. */
+ kfree(child->bts_buffer);
+ child->bts_buffer = NULL;
+ child->bts_size = 0;
}
+}
- ret = ds_allocate((void **)&child->thread.ds_area_msr,
- size << PAGE_SHIFT);
- if (ret < 0)
- goto out;
-
- current->mm->total_vm += size;
- current->mm->locked_vm += size;
-
-out:
- if (child->thread.ds_area_msr)
- set_tsk_thread_flag(child, TIF_DS_AREA_MSR);
- else
- clear_tsk_thread_flag(child, TIF_DS_AREA_MSR);
-
- return ret;
+static void ptrace_bts_detach(struct task_struct *child)
+{
+ /*
+ * Ptrace_detach() races with ptrace_untrace() in case
+ * the child dies and is reaped by another thread.
+ *
+ * We only do the memory accounting at this point and
+ * leave the buffer deallocation and the bts tracer
+ * release to ptrace_bts_untrace() which will be called
+ * later on with tasklist_lock held.
+ */
+ release_locked_buffer(child->bts_buffer, child->bts_size);
}
+#else
+static inline void ptrace_bts_fork(struct task_struct *tsk) {}
+static inline void ptrace_bts_detach(struct task_struct *child) {}
+static inline void ptrace_bts_untrace(struct task_struct *child) {}
+#endif /* CONFIG_X86_PTRACE_BTS */
-void ptrace_bts_take_timestamp(struct task_struct *tsk,
- enum bts_qualifier qualifier)
+void x86_ptrace_fork(struct task_struct *child, unsigned long clone_flags)
{
- struct bts_struct rec = {
- .qualifier = qualifier,
- .variant.jiffies = jiffies_64
- };
+ ptrace_bts_fork(child);
+}
- ptrace_bts_write_record(tsk, &rec);
+void x86_ptrace_untrace(struct task_struct *child)
+{
+ ptrace_bts_untrace(child);
}
-#endif /* X86_BTS */
/*
* Called by kernel/ptrace.c when detaching..
#ifdef TIF_SYSCALL_EMU
clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
#endif
- if (child->thread.ds_area_msr) {
-#ifdef X86_BTS
- ptrace_bts_realloc(child, 0, 0);
-#endif
- child->thread.debugctlmsr &= ~ds_debugctl_mask();
- if (!child->thread.debugctlmsr)
- clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
- clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
- }
+ ptrace_bts_detach(child);
}
#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
return copy_regset_to_user(child, &user_x86_32_view,
REGSET_XFP,
0, sizeof(struct user_fxsr_struct),
- datap);
+ datap) ? -EIO : 0;
case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
return copy_regset_from_user(child, &user_x86_32_view,
REGSET_XFP,
0, sizeof(struct user_fxsr_struct),
- datap);
+ datap) ? -EIO : 0;
#endif
#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
/*
* These bits need more cooking - not enabled yet:
*/
-#ifdef X86_BTS
+#ifdef CONFIG_X86_PTRACE_BTS
case PTRACE_BTS_CONFIG:
ret = ptrace_bts_config
(child, data, (struct ptrace_bts_config __user *)addr);
break;
case PTRACE_BTS_SIZE:
- ret = ptrace_bts_get_size(child);
+ ret = ptrace_bts_size(child);
break;
case PTRACE_BTS_GET:
ret = ptrace_bts_drain
(child, data, (struct bts_struct __user *) addr);
break;
-#endif
+#endif /* CONFIG_X86_PTRACE_BTS */
default:
ret = ptrace_request(child, request, addr, data);
case PTRACE_GET_THREAD_AREA:
case PTRACE_SET_THREAD_AREA:
+#ifdef CONFIG_X86_PTRACE_BTS
+ case PTRACE_BTS_CONFIG:
+ case PTRACE_BTS_STATUS:
+ case PTRACE_BTS_SIZE:
+ case PTRACE_BTS_GET:
+ case PTRACE_BTS_CLEAR:
+ case PTRACE_BTS_DRAIN:
+#endif /* CONFIG_X86_PTRACE_BTS */
return arch_ptrace(child, request, addr, data);
default:
.size = sizeof(long), .align = sizeof(long),
.active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
},
+ [REGSET_IOPERM64] = {
+ .core_note_type = NT_386_IOPERM,
+ .n = IO_BITMAP_LONGS,
+ .size = sizeof(long), .align = sizeof(long),
+ .active = ioperm_active, .get = ioperm_get
+ },
};
static const struct user_regset_view user_x86_64_view = {
.active = regset_tls_active,
.get = regset_tls_get, .set = regset_tls_set
},
+ [REGSET_IOPERM32] = {
+ .core_note_type = NT_386_IOPERM,
+ .n = IO_BITMAP_BYTES / sizeof(u32),
+ .size = sizeof(u32), .align = sizeof(u32),
+ .active = ioperm_active, .get = ioperm_get
+ },
};
static const struct user_regset_view user_x86_32_view = {
#endif
}
-#ifdef CONFIG_X86_32
-
-void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code)
+void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
+ int error_code, int si_code)
{
struct siginfo info;
memset(&info, 0, sizeof(info));
info.si_signo = SIGTRAP;
- info.si_code = TRAP_BRKPT;
+ info.si_code = si_code;
/* User-mode ip? */
info.si_addr = user_mode_vm(regs) ? (void __user *) regs->ip : NULL;
force_sig_info(SIGTRAP, &info, tsk);
}
-/* notification of system call entry/exit
- * - triggered by current->work.syscall_trace
- */
-int do_syscall_trace(struct pt_regs *regs, int entryexit)
-{
- int is_sysemu = test_thread_flag(TIF_SYSCALL_EMU);
- /*
- * With TIF_SYSCALL_EMU set we want to ignore TIF_SINGLESTEP for syscall
- * interception
- */
- int is_singlestep = !is_sysemu && test_thread_flag(TIF_SINGLESTEP);
- int ret = 0;
-
- /* do the secure computing check first */
- if (!entryexit)
- secure_computing(regs->orig_ax);
- if (unlikely(current->audit_context)) {
- if (entryexit)
- audit_syscall_exit(AUDITSC_RESULT(regs->ax),
- regs->ax);
- /* Debug traps, when using PTRACE_SINGLESTEP, must be sent only
- * on the syscall exit path. Normally, when TIF_SYSCALL_AUDIT is
- * not used, entry.S will call us only on syscall exit, not
- * entry; so when TIF_SYSCALL_AUDIT is used we must avoid
- * calling send_sigtrap() on syscall entry.
- *
- * Note that when PTRACE_SYSEMU_SINGLESTEP is used,
- * is_singlestep is false, despite his name, so we will still do
- * the correct thing.
- */
- else if (is_singlestep)
- goto out;
- }
-
- if (!(current->ptrace & PT_PTRACED))
- goto out;
-
- /* If a process stops on the 1st tracepoint with SYSCALL_TRACE
- * and then is resumed with SYSEMU_SINGLESTEP, it will come in
- * here. We have to check this and return */
- if (is_sysemu && entryexit)
- return 0;
-
- /* Fake a debug trap */
- if (is_singlestep)
- send_sigtrap(current, regs, 0);
-
- if (!test_thread_flag(TIF_SYSCALL_TRACE) && !is_sysemu)
- goto out;
-
- /* the 0x80 provides a way for the tracing parent to distinguish
- between a syscall stop and SIGTRAP delivery */
- /* Note that the debugger could change the result of test_thread_flag!*/
- ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ? 0x80:0));
-
- /*
- * this isn't the same as continuing with a signal, but it will do
- * for normal use. strace only continues with a signal if the
- * stopping signal is not SIGTRAP. -brl
- */
- if (current->exit_code) {
- send_sig(current->exit_code, current, 1);
- current->exit_code = 0;
- }
- ret = is_sysemu;
-out:
- if (unlikely(current->audit_context) && !entryexit)
- audit_syscall_entry(AUDIT_ARCH_I386, regs->orig_ax,
- regs->bx, regs->cx, regs->dx, regs->si);
- if (ret == 0)
- return 0;
-
- regs->orig_ax = -1; /* force skip of syscall restarting */
- if (unlikely(current->audit_context))
- audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax);
- return 1;
-}
-
-#else /* CONFIG_X86_64 */
+#ifdef CONFIG_X86_32
+# define IS_IA32 1
+#elif defined CONFIG_IA32_EMULATION
+# define IS_IA32 test_thread_flag(TIF_IA32)
+#else
+# define IS_IA32 0
+#endif
-static void syscall_trace(struct pt_regs *regs)
+/*
+ * We must return the syscall number to actually look up in the table.
+ * This can be -1L to skip running any syscall at all.
+ */
+asmregparm long syscall_trace_enter(struct pt_regs *regs)
{
+ long ret = 0;
-#if 0
- printk("trace %s ip %lx sp %lx ax %d origrax %d caller %lx tiflags %x ptrace %x\n",
- current->comm,
- regs->ip, regs->sp, regs->ax, regs->orig_ax, __builtin_return_address(0),
- current_thread_info()->flags, current->ptrace);
-#endif
-
- ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
- ? 0x80 : 0));
/*
- * this isn't the same as continuing with a signal, but it will do
- * for normal use. strace only continues with a signal if the
- * stopping signal is not SIGTRAP. -brl
+ * If we stepped into a sysenter/syscall insn, it trapped in
+ * kernel mode; do_debug() cleared TF and set TIF_SINGLESTEP.
+ * If user-mode had set TF itself, then it's still clear from
+ * do_debug() and we need to set it again to restore the user
+ * state. If we entered on the slow path, TF was already set.
*/
- if (current->exit_code) {
- send_sig(current->exit_code, current, 1);
- current->exit_code = 0;
- }
-}
+ if (test_thread_flag(TIF_SINGLESTEP))
+ regs->flags |= X86_EFLAGS_TF;
-asmlinkage void syscall_trace_enter(struct pt_regs *regs)
-{
/* do the secure computing check first */
secure_computing(regs->orig_ax);
- if (test_thread_flag(TIF_SYSCALL_TRACE)
- && (current->ptrace & PT_PTRACED))
- syscall_trace(regs);
+ if (unlikely(test_thread_flag(TIF_SYSCALL_EMU)))
+ ret = -1L;
+
+ if ((ret || test_thread_flag(TIF_SYSCALL_TRACE)) &&
+ tracehook_report_syscall_entry(regs))
+ ret = -1L;
if (unlikely(current->audit_context)) {
- if (test_thread_flag(TIF_IA32)) {
+ if (IS_IA32)
audit_syscall_entry(AUDIT_ARCH_I386,
regs->orig_ax,
regs->bx, regs->cx,
regs->dx, regs->si);
- } else {
+#ifdef CONFIG_X86_64
+ else
audit_syscall_entry(AUDIT_ARCH_X86_64,
regs->orig_ax,
regs->di, regs->si,
regs->dx, regs->r10);
- }
+#endif
}
+
+ return ret ?: regs->orig_ax;
}
-asmlinkage void syscall_trace_leave(struct pt_regs *regs)
+asmregparm void syscall_trace_leave(struct pt_regs *regs)
{
if (unlikely(current->audit_context))
audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax);
- if ((test_thread_flag(TIF_SYSCALL_TRACE)
- || test_thread_flag(TIF_SINGLESTEP))
- && (current->ptrace & PT_PTRACED))
- syscall_trace(regs);
-}
+ if (test_thread_flag(TIF_SYSCALL_TRACE))
+ tracehook_report_syscall_exit(regs, 0);
-#endif /* CONFIG_X86_32 */
+ /*
+ * If TIF_SYSCALL_EMU is set, we only get here because of
+ * TIF_SINGLESTEP (i.e. this is PTRACE_SYSEMU_SINGLESTEP).
+ * We already reported this syscall instruction in
+ * syscall_trace_enter(), so don't do any more now.
+ */
+ if (unlikely(test_thread_flag(TIF_SYSCALL_EMU)))
+ return;
+
+ /*
+ * If we are single-stepping, synthesize a trap to follow the
+ * system call instruction.
+ */
+ if (test_thread_flag(TIF_SINGLESTEP) &&
+ tracehook_consider_fatal_signal(current, SIGTRAP, SIG_DFL))
+ send_sigtrap(current, regs, 0, TRAP_BRKPT);
+}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff