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From: Oleg Nesterov <oleg@redhat.com>
[PATCH] signals: check ->group_stop_count after tracehook_get_signal()
Move the call to do_signal_stop() down, after tracehook call.
This makes ->group_stop_count condition visible to tracers before
do_signal_stop() will participate in this group-stop.
Currently the patch has no effect, tracehook_get_signal() always
returns 0.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Roland McGrath <roland@redhat.com>
---
include/linux/ptrace.h | 1 +
include/linux/sched.h | 1 +
include/linux/tracehook.h | 10 +++++-----
kernel/ptrace.c | 2 +-
kernel/signal.c | 4 ++--
5 files changed, 10 insertions(+), 8 deletions(-)
diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h
index 092a04f..619cdf0 100644
--- a/include/linux/ptrace.h
+++ b/include/linux/ptrace.h
@@ -106,6 +106,7 @@ extern int ptrace_traceme(void);
extern int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len);
extern int ptrace_writedata(struct task_struct *tsk, char __user *src, unsigned long dst, int len);
extern int ptrace_attach(struct task_struct *tsk);
+extern bool __ptrace_detach(struct task_struct *tracer, struct task_struct *tracee);
extern int ptrace_detach(struct task_struct *, unsigned int);
extern void ptrace_disable(struct task_struct *);
extern int ptrace_check_attach(struct task_struct *task, int kill);
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 2238745..09f26df 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2061,6 +2061,7 @@ extern int kill_pgrp(struct pid *pid, in
extern int kill_pid(struct pid *pid, int sig, int priv);
extern int kill_proc_info(int, struct siginfo *, pid_t);
extern int do_notify_parent(struct task_struct *, int);
+extern void do_notify_parent_cldstop(struct task_struct *, int);
extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
extern void force_sig(int, struct task_struct *);
extern int send_sig(int, struct task_struct *, int);
diff --git a/include/linux/tracehook.h b/include/linux/tracehook.h
index 3a2e66d..98917e9 100644
--- a/include/linux/tracehook.h
+++ b/include/linux/tracehook.h
@@ -134,7 +134,7 @@ static inline __must_check int tracehook
*/
static inline void tracehook_report_syscall_exit(struct pt_regs *regs, int step)
{
- if (step) {
+ if (step && (task_ptrace(current) & PT_PTRACED)) {
siginfo_t info;
user_single_step_siginfo(current, regs, &info);
force_sig_info(SIGTRAP, &info, current);
@@ -156,7 +156,7 @@ static inline int tracehook_unsafe_exec(
{
int unsafe = 0;
int ptrace = task_ptrace(task);
- if (ptrace & PT_PTRACED) {
+ if (ptrace) {
if (ptrace & PT_PTRACE_CAP)
unsafe |= LSM_UNSAFE_PTRACE_CAP;
else
@@ -178,7 +178,7 @@ static inline int tracehook_unsafe_exec(
*/
static inline struct task_struct *tracehook_tracer_task(struct task_struct *tsk)
{
- if (task_ptrace(tsk) & PT_PTRACED)
+ if (task_ptrace(tsk))
return rcu_dereference(tsk->parent);
return NULL;
}
@@ -386,7 +386,7 @@ static inline void tracehook_signal_hand
const struct k_sigaction *ka,
struct pt_regs *regs, int stepping)
{
- if (stepping)
+ if (stepping && (task_ptrace(current) & PT_PTRACED))
ptrace_notify(SIGTRAP);
}
@@ -492,7 +492,7 @@ static inline int tracehook_get_signal(s
*/
static inline int tracehook_notify_jctl(int notify, int why)
{
- return notify ?: (current->ptrace & PT_PTRACED) ? why : 0;
+ return notify ?: task_ptrace(current) ? why : 0;
}
/**
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 99bbaa3..84d9f8f 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -270,7 +270,7 @@ static int ignoring_children(struct sigh
* reap it now, in that case we must also wake up sub-threads sleeping in
* do_wait().
*/
-static bool __ptrace_detach(struct task_struct *tracer, struct task_struct *p)
+bool __ptrace_detach(struct task_struct *tracer, struct task_struct *p)
{
__ptrace_unlink(p);
diff --git a/kernel/signal.c b/kernel/signal.c
index 4e3cff1..b74324d 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1522,7 +1522,7 @@ int do_notify_parent(struct task_struct
return ret;
}
-static void do_notify_parent_cldstop(struct task_struct *tsk, int why)
+void do_notify_parent_cldstop(struct task_struct *tsk, int why)
{
struct siginfo info;
unsigned long flags;
@@ -1794,7 +1794,7 @@ static int do_signal_stop(int signr)
static int ptrace_signal(int signr, siginfo_t *info,
struct pt_regs *regs, void *cookie)
{
- if (!task_ptrace(current))
+ if (!(task_ptrace(current) & PT_PTRACED))
return signr;
ptrace_signal_deliver(regs, cookie);
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