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[PATCH] cleanup the usage of SEND_SIG_xxx constants 

This patch simplifies some checks for magic siginfo values.  It should not
change the behaviour in any way.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Oleg Nesterov 2005-10-30 15:03:45 -08:00 committed by Linus Torvalds
parent b67a1b9e4b
commit 621d31219d
3 changed files with 13 additions and 13 deletions
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5
include/linux/sched.h
View File

@ -1084,6 +1084,11 @@ extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned lon
#define SEND_SIG_PRIV ((struct siginfo *) 1)
#define SEND_SIG_FORCED ((struct siginfo *) 2)
static inline int is_si_special(const struct siginfo *info)
{
return info <= SEND_SIG_FORCED;
}
/* True if we are on the alternate signal stack. */
static inline int on_sig_stack(unsigned long sp)

18
kernel/signal.c
View File

@ -651,9 +651,7 @@ static int check_kill_permission(int sig, struct siginfo *info,
if (!valid_signal(sig))
return error;
error = -EPERM;
if ((info == SEND_SIG_NOINFO ||
(info != SEND_SIG_PRIV && info != SEND_SIG_FORCED
&& SI_FROMUSER(info)))
if ((info == SEND_SIG_NOINFO || (!is_si_special(info) && SI_FROMUSER(info)))
&& ((sig != SIGCONT) ||
(current->signal->session != t->signal->session))
&& (current->euid ^ t->suid) && (current->euid ^ t->uid)
@ -802,7 +800,7 @@ 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 &&
(info < SEND_SIG_FORCED ||
(is_si_special(info) ||
info->si_code >= 0)));
if (q) {
list_add_tail(&q->list, &signals->list);
@ -825,16 +823,14 @@ static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
copy_siginfo(&q->info, info);
break;
}
} else {
if (sig >= SIGRTMIN
&& info != SEND_SIG_NOINFO && info != SEND_SIG_PRIV
&& info->si_code != SI_USER)
} else if (!is_si_special(info)) {
if (sig >= SIGRTMIN && 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 ((info > SEND_SIG_PRIV) && (info->si_code == SI_TIMER))
if (info->si_code == SI_TIMER)
/*
* Set up a return to indicate that we dropped
* the signal.
@ -860,7 +856,7 @@ specific_send_sig_info(int sig, struct siginfo *info, struct task_struct *t)
BUG();
assert_spin_locked(&t->sighand->siglock);
if ((info > SEND_SIG_FORCED) && (info->si_code == SI_TIMER))
if (!is_si_special(info) && (info->si_code == SI_TIMER))
/*
* Set up a return to indicate that we dropped the signal.
*/
@ -1052,7 +1048,7 @@ __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 ((info > SEND_SIG_FORCED) && (info->si_code == SI_TIMER))
if (!is_si_special(info) && (info->si_code == SI_TIMER))
/*
* Set up a return to indicate that we dropped the signal.
*/

3
security/selinux/hooks.c
View File

@ -2713,8 +2713,7 @@ static int selinux_task_kill(struct task_struct *p, struct siginfo *info, int si
if (rc)
return rc;
if (info != SEND_SIG_NOINFO && (info == SEND_SIG_PRIV ||
info == SEND_SIG_FORCED || SI_FROMKERNEL(info)))
if (info != SEND_SIG_NOINFO && (is_si_special(info) || SI_FROMKERNEL(info)))
return 0;
if (!sig)