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ptrace: Return the signal to continue with from ptrace_stop

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The signal a task should continue with after a ptrace stop is
inconsistently read, cleared, and sent.  Solve this by reading and
clearing the signal to be sent in ptrace_stop.

In an ideal world everything except ptrace_signal would share a common
implementation of continuing with the signal, so ptracers could count
on the signal they ask to continue with actually being delivered.  For
now retain bug compatibility and just return with the signal number
the ptracer requested the code continue with.

Link: https://lkml.kernel.org/r/875yoe7qdp.fsf_-_@email.froward.int.ebiederm.org
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman
2022-01-27 12:19:13 -06:00
parent 336d4b814b
commit 6487d1dab8
2 changed files with 25 additions and 19 deletions
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12
include/linux/ptrace.h
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@@ -60,7 +60,7 @@ extern int ptrace_writedata(struct task_struct *tsk, char __user *src, unsigned
extern void ptrace_disable(struct task_struct *);
extern int ptrace_request(struct task_struct *child, long request,
unsigned long addr, unsigned long data);
extern void ptrace_notify(int exit_code, unsigned long message);
extern int ptrace_notify(int exit_code, unsigned long message);
extern void __ptrace_link(struct task_struct *child,
struct task_struct *new_parent,
const struct cred *ptracer_cred);
@@ -419,21 +419,21 @@ extern void sigaction_compat_abi(struct k_sigaction *act, struct k_sigaction *oa
static inline int ptrace_report_syscall(unsigned long message)
{
int ptrace = current->ptrace;
int signr;
if (!(ptrace & PT_PTRACED))
return 0;
ptrace_notify(SIGTRAP | ((ptrace & PT_TRACESYSGOOD) ? 0x80 : 0), message);
signr = ptrace_notify(SIGTRAP | ((ptrace & PT_TRACESYSGOOD) ? 0x80 : 0),
message);
/*
* 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;
}
if (signr)
send_sig(signr, current, 1);
return fatal_signal_pending(current);
}