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-rw-r--r--kernel/exit.c10
-rw-r--r--kernel/signal.c35
-rw-r--r--security/selinux/hooks.c4
3 files changed, 27 insertions, 22 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index 2d39ccc367e..537394b25e8 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -547,7 +547,7 @@ static inline void reparent_thread(task_t *p, task_t *father, int traced)
if (p->pdeath_signal)
/* We already hold the tasklist_lock here. */
- group_send_sig_info(p->pdeath_signal, (void *) 0, p);
+ group_send_sig_info(p->pdeath_signal, SEND_SIG_NOINFO, p);
/* Move the child from its dying parent to the new one. */
if (unlikely(traced)) {
@@ -591,8 +591,8 @@ static inline void reparent_thread(task_t *p, task_t *father, int traced)
int pgrp = process_group(p);
if (will_become_orphaned_pgrp(pgrp, NULL) && has_stopped_jobs(pgrp)) {
- __kill_pg_info(SIGHUP, (void *)1, pgrp);
- __kill_pg_info(SIGCONT, (void *)1, pgrp);
+ __kill_pg_info(SIGHUP, SEND_SIG_PRIV, pgrp);
+ __kill_pg_info(SIGCONT, SEND_SIG_PRIV, pgrp);
}
}
}
@@ -727,8 +727,8 @@ static void exit_notify(struct task_struct *tsk)
(t->signal->session == tsk->signal->session) &&
will_become_orphaned_pgrp(process_group(tsk), tsk) &&
has_stopped_jobs(process_group(tsk))) {
- __kill_pg_info(SIGHUP, (void *)1, process_group(tsk));
- __kill_pg_info(SIGCONT, (void *)1, process_group(tsk));
+ __kill_pg_info(SIGHUP, SEND_SIG_PRIV, process_group(tsk));
+ __kill_pg_info(SIGCONT, SEND_SIG_PRIV, process_group(tsk));
}
/* Let father know we died
diff --git a/kernel/signal.c b/kernel/signal.c
index 9d1512dcf17..1f7b2aaa4a3 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -651,8 +651,9 @@ static int check_kill_permission(int sig, struct siginfo *info,
if (!valid_signal(sig))
return error;
error = -EPERM;
- if ((!info || ((unsigned long)info != 1 &&
- (unsigned long)info != 2 && SI_FROMUSER(info)))
+ if ((info == SEND_SIG_NOINFO ||
+ (info != SEND_SIG_PRIV && info != SEND_SIG_FORCED
+ && SI_FROMUSER(info)))
&& ((sig != SIGCONT) ||
(current->signal->session != t->signal->session))
&& (current->euid ^ t->suid) && (current->euid ^ t->uid)
@@ -789,7 +790,7 @@ static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
* fast-pathed signals for kernel-internal things like SIGSTOP
* or SIGKILL.
*/
- if ((unsigned long)info == 2)
+ if (info == SEND_SIG_FORCED)
goto out_set;
/* Real-time signals must be queued if sent by sigqueue, or
@@ -801,19 +802,19 @@ static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
pass on the info struct. */
q = __sigqueue_alloc(t, GFP_ATOMIC, (sig < SIGRTMIN &&
- ((unsigned long) info < 2 ||
+ (info < SEND_SIG_FORCED ||
info->si_code >= 0)));
if (q) {
list_add_tail(&q->list, &signals->list);
switch ((unsigned long) info) {
- case 0:
+ case (unsigned long) SEND_SIG_NOINFO:
q->info.si_signo = sig;
q->info.si_errno = 0;
q->info.si_code = SI_USER;
q->info.si_pid = current->pid;
q->info.si_uid = current->uid;
break;
- case 1:
+ case (unsigned long) SEND_SIG_PRIV:
q->info.si_signo = sig;
q->info.si_errno = 0;
q->info.si_code = SI_KERNEL;
@@ -825,14 +826,15 @@ static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
break;
}
} else {
- if (sig >= SIGRTMIN && info && (unsigned long)info != 1
+ if (sig >= SIGRTMIN
+ && info != SEND_SIG_NOINFO && info != SEND_SIG_PRIV
&& info->si_code != SI_USER)
/*
* Queue overflow, abort. We may abort if the signal was rt
* and sent by user using something other than kill().
*/
return -EAGAIN;
- if (((unsigned long)info > 1) && (info->si_code == SI_TIMER))
+ if ((info > SEND_SIG_PRIV) && (info->si_code == SI_TIMER))
/*
* Set up a return to indicate that we dropped
* the signal.
@@ -858,7 +860,7 @@ specific_send_sig_info(int sig, struct siginfo *info, struct task_struct *t)
BUG();
assert_spin_locked(&t->sighand->siglock);
- if (((unsigned long)info > 2) && (info->si_code == SI_TIMER))
+ if ((info > SEND_SIG_FORCED) && (info->si_code == SI_TIMER))
/*
* Set up a return to indicate that we dropped the signal.
*/
@@ -914,7 +916,7 @@ force_sig_specific(int sig, struct task_struct *t)
t->sighand->action[sig-1].sa.sa_handler = SIG_DFL;
sigdelset(&t->blocked, sig);
recalc_sigpending_tsk(t);
- specific_send_sig_info(sig, (void *)2, t);
+ specific_send_sig_info(sig, SEND_SIG_FORCED, t);
spin_unlock_irqrestore(&t->sighand->siglock, flags);
}
@@ -1050,7 +1052,7 @@ __group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p)
assert_spin_locked(&p->sighand->siglock);
handle_stop_signal(sig, p);
- if (((unsigned long)info > 2) && (info->si_code == SI_TIMER))
+ if ((info > SEND_SIG_FORCED) && (info->si_code == SI_TIMER))
/*
* Set up a return to indicate that we dropped the signal.
*/
@@ -1285,10 +1287,13 @@ send_sig_info(int sig, struct siginfo *info, struct task_struct *p)
return ret;
}
+#define __si_special(priv) \
+ ((priv) ? SEND_SIG_PRIV : SEND_SIG_NOINFO)
+
int
send_sig(int sig, struct task_struct *p, int priv)
{
- return send_sig_info(sig, (void*)(long)(priv != 0), p);
+ return send_sig_info(sig, __si_special(priv), p);
}
/*
@@ -1308,7 +1313,7 @@ send_group_sig_info(int sig, struct siginfo *info, struct task_struct *p)
void
force_sig(int sig, struct task_struct *p)
{
- force_sig_info(sig, (void*)1L, p);
+ force_sig_info(sig, SEND_SIG_PRIV, p);
}
/*
@@ -1333,13 +1338,13 @@ force_sigsegv(int sig, struct task_struct *p)
int
kill_pg(pid_t pgrp, int sig, int priv)
{
- return kill_pg_info(sig, (void *)(long)(priv != 0), pgrp);
+ return kill_pg_info(sig, __si_special(priv), pgrp);
}
int
kill_proc(pid_t pid, int sig, int priv)
{
- return kill_proc_info(sig, (void *)(long)(priv != 0), pid);
+ return kill_proc_info(sig, __si_special(priv), pid);
}
/*
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index bb62838be49..295ac472faf 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2713,8 +2713,8 @@ static int selinux_task_kill(struct task_struct *p, struct siginfo *info, int si
if (rc)
return rc;
- if (info && ((unsigned long)info == 1 ||
- (unsigned long)info == 2 || SI_FROMKERNEL(info)))
+ if (info != SEND_SIG_NOINFO && (info == SEND_SIG_PRIV ||
+ info == SEND_SIG_FORCED || SI_FROMKERNEL(info)))
return 0;
if (!sig)
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-19 11:54:27 +0000