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task_work: Call tracehook_notify_signal from get_signal on all architectures

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Always handle TIF_NOTIFY_SIGNAL in get_signal.  With commit 35d0b389f3
("task_work: unconditionally run task_work from get_signal()") always
calling task_work_run all of the work of tracehook_notify_signal is
already happening except clearing TIF_NOTIFY_SIGNAL.

Factor clear_notify_signal out of tracehook_notify_signal and use it in
get_signal so that get_signal only needs one call of task_work_run.

To keep the semantics in sync update xfer_to_guest_mode_work (which
does not call get_signal) to call tracehook_notify_signal if either
_TIF_SIGPENDING or _TIF_NOTIFY_SIGNAL.

Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lkml.kernel.org/r/20220309162454.123006-8-ebiederm@xmission.com
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2022-02-09 09:51:14 -06:00
parent 7f62d40d9c
commit 8ba62d3794
7 changed files with 18 additions and 29 deletions
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2
include/linux/entry-common.h
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@ -257,7 +257,7 @@ static __always_inline void arch_exit_to_user_mode(void) { }
*
* Invoked from exit_to_user_mode_loop().
*/
void arch_do_signal_or_restart(struct pt_regs *regs, bool has_signal);
void arch_do_signal_or_restart(struct pt_regs *regs);
/**
* exit_to_user_mode - Fixup state when exiting to user mode