diff options
| -rw-r--r-- | include/uapi/linux/ptrace.h | 12 | ||||
| -rw-r--r-- | kernel/ptrace.c | 80 |
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) |