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-rw-r--r--include/uapi/linux/ptrace.h12
-rw-r--r--kernel/ptrace.c80
2 files changed, 92 insertions, 0 deletions
diff --git a/include/uapi/linux/ptrace.h b/include/uapi/linux/ptrace.h
index 022ab186a812..52ebcc89f306 100644
--- a/include/uapi/linux/ptrace.h
+++ b/include/uapi/linux/ptrace.h
@@ -5,6 +5,7 @@
/* has the defines to get at the registers. */
+#include <linux/types.h>
#define PTRACE_TRACEME 0
#define PTRACE_PEEKTEXT 1
@@ -52,6 +53,17 @@
#define PTRACE_INTERRUPT 0x4207
#define PTRACE_LISTEN 0x4208
+#define PTRACE_PEEKSIGINFO 0x4209
+
+struct ptrace_peeksiginfo_args {
+ __u64 off; /* from which siginfo to start */
+ __u32 flags;
+ __s32 nr; /* how may siginfos to take */
+};
+
+/* Read signals from a shared (process wide) queue */
+#define PTRACE_PEEKSIGINFO_SHARED (1 << 0)
+
/* Wait extended result codes for the above trace options. */
#define PTRACE_EVENT_FORK 1
#define PTRACE_EVENT_VFORK 2
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index acbd28424d81..17ae54da0ec2 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -24,6 +24,7 @@
#include <linux/regset.h>
#include <linux/hw_breakpoint.h>
#include <linux/cn_proc.h>
+#include <linux/compat.h>
static int ptrace_trapping_sleep_fn(void *flags)
@@ -618,6 +619,81 @@ static int ptrace_setsiginfo(struct task_struct *child, const siginfo_t *info)
return error;
}
+static int ptrace_peek_siginfo(struct task_struct *child,
+ unsigned long addr,
+ unsigned long data)
+{
+ struct ptrace_peeksiginfo_args arg;
+ struct sigpending *pending;
+ struct sigqueue *q;
+ int ret, i;
+
+ ret = copy_from_user(&arg, (void __user *) addr,
+ sizeof(struct ptrace_peeksiginfo_args));
+ if (ret)
+ return -EFAULT;
+
+ if (arg.flags & ~PTRACE_PEEKSIGINFO_SHARED)
+ return -EINVAL; /* unknown flags */
+
+ if (arg.nr < 0)
+ return -EINVAL;
+
+ if (arg.flags & PTRACE_PEEKSIGINFO_SHARED)
+ pending = &child->signal->shared_pending;
+ else
+ pending = &child->pending;
+
+ for (i = 0; i < arg.nr; ) {
+ siginfo_t info;
+ s32 off = arg.off + i;
+
+ spin_lock_irq(&child->sighand->siglock);
+ list_for_each_entry(q, &pending->list, list) {
+ if (!off--) {
+ copy_siginfo(&info, &q->info);
+ break;
+ }
+ }
+ spin_unlock_irq(&child->sighand->siglock);
+
+ if (off >= 0) /* beyond the end of the list */
+ break;
+
+#ifdef CONFIG_COMPAT
+ if (unlikely(is_compat_task())) {
+ compat_siginfo_t __user *uinfo = compat_ptr(data);
+
+ ret = copy_siginfo_to_user32(uinfo, &info);
+ ret |= __put_user(info.si_code, &uinfo->si_code);
+ } else
+#endif
+ {
+ siginfo_t __user *uinfo = (siginfo_t __user *) data;
+
+ ret = copy_siginfo_to_user(uinfo, &info);
+ ret |= __put_user(info.si_code, &uinfo->si_code);
+ }
+
+ if (ret) {
+ ret = -EFAULT;
+ break;
+ }
+
+ data += sizeof(siginfo_t);
+ i++;
+
+ if (signal_pending(current))
+ break;
+
+ cond_resched();
+ }
+
+ if (i > 0)
+ return i;
+
+ return ret;
+}
#ifdef PTRACE_SINGLESTEP
#define is_singlestep(request) ((request) == PTRACE_SINGLESTEP)
@@ -748,6 +824,10 @@ int ptrace_request(struct task_struct *child, long request,
ret = put_user(child->ptrace_message, datalp);
break;
+ case PTRACE_PEEKSIGINFO:
+ ret = ptrace_peek_siginfo(child, addr, data);
+ break;
+
case PTRACE_GETSIGINFO:
ret = ptrace_getsiginfo(child, &siginfo);
if (!ret)