130 lines
4.6 KiB
Diff
130 lines
4.6 KiB
Diff
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 4272521..a85fb41 100644
|
|
--- a/include/linux/ptrace.h
|
|
+++ b/include/linux/ptrace.h
|
|
@@ -105,6 +105,7 @@ 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 ce160d6..5e7cc95 100644
|
|
--- a/include/linux/sched.h
|
|
+++ b/include/linux/sched.h
|
|
@@ -2030,6 +2030,7 @@ 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 10db010..c78b2f4 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 f34d798..8049cb5 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 bded651..6d13d9f 100644
|
|
--- a/kernel/signal.c
|
|
+++ b/kernel/signal.c
|
|
@@ -1521,7 +1521,7 @@ 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;
|
|
@@ -1791,7 +1791,7 @@ 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);
|