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signal: fill in si_code in prepare_kill_siginfo()

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So that do_tkill() can use this helper too. This also simplifies
the next patch.

TODO: perhaps we can kill prepare_kill_siginfo() and change the
callers to use SEND_SIG_NOINFO,  but this needs some changes in
__send_signal_locked() and TP_STORE_SIGINFO().

Reviewed-by: Tycho Andersen <tandersen@netflix.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Link: https://lore.kernel.org/r/20240209130620.GA8039@redhat.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Oleg Nesterov 2024-02-09 14:06:20 +01:00 committed by Christian Brauner
parent f0ece18e99
commit c044a95026
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 6 additions and 10 deletions
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16
kernel/signal.c
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@ -3793,12 +3793,13 @@ COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait_time32, compat_sigset_t __user *, uthese,
#endif
#endif
static inline void prepare_kill_siginfo(int sig, struct kernel_siginfo *info)
static void prepare_kill_siginfo(int sig, struct kernel_siginfo *info,
enum pid_type type)
{
clear_siginfo(info);
info->si_signo = sig;
info->si_errno = 0;
info->si_code = SI_USER;
info->si_code = (type == PIDTYPE_PID) ? SI_TKILL : SI_USER;
info->si_pid = task_tgid_vnr(current);
info->si_uid = from_kuid_munged(current_user_ns(), current_uid());
}
@ -3812,7 +3813,7 @@ SYSCALL_DEFINE2(kill, pid_t, pid, int, sig)
{
struct kernel_siginfo info;
prepare_kill_siginfo(sig, &info);
prepare_kill_siginfo(sig, &info, PIDTYPE_TGID);
return kill_something_info(sig, &info, pid);
}
@ -3925,7 +3926,7 @@ SYSCALL_DEFINE4(pidfd_send_signal, int, pidfd, int, sig,
(kinfo.si_code >= 0 || kinfo.si_code == SI_TKILL))
goto err;
} else {
prepare_kill_siginfo(sig, &kinfo);
prepare_kill_siginfo(sig, &kinfo, PIDTYPE_TGID);
}
/* TODO: respect PIDFD_THREAD */
@ -3970,12 +3971,7 @@ static int do_tkill(pid_t tgid, pid_t pid, int sig)
{
struct kernel_siginfo info;
clear_siginfo(&info);
info.si_signo = sig;
info.si_errno = 0;
info.si_code = SI_TKILL;
info.si_pid = task_tgid_vnr(current);
info.si_uid = from_kuid_munged(current_user_ns(), current_uid());
prepare_kill_siginfo(sig, &info, PIDTYPE_PID);
return do_send_specific(tgid, pid, sig, &info);
}