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Fixed sigaction() for SIGKILL and SIGSTOP. Reading the old action now

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succeeds.  Writing an action now succeeds iff the handler isn't changed.
(POSIX allows attempts to change the handler to be ignored or cause an
error.  Changing other parts of the action is allowed (except attempts
to mask unmaskable signals are silently ignored as usual).)

Found by:	NIST-PCTS
This commit is contained in:
Bruce Evans 1996-11-29 18:01:55 +00:00
parent 035c873e99
commit e6eeb36daf
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=20028
1 changed files with 9 additions and 5 deletions
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14
sys/kern/kern_sig.c
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@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)kern_sig.c 8.7 (Berkeley) 4/18/94
* $Id: kern_sig.c,v 1.25 1996/07/09 18:12:37 ache Exp $
* $Id: kern_sig.c,v 1.26 1996/10/19 01:06:20 davidg Exp $
*/
#include "opt_ktrace.h"
@ -108,8 +108,7 @@ sigaction(p, uap, retval)
int bit, error;
signum = uap->signum;
if (signum <= 0 || signum >= NSIG ||
signum == SIGKILL || signum == SIGSTOP)
if (signum <= 0 || signum >= NSIG)
return (EINVAL);
sa = &vec;
if (uap->osa) {
@ -135,6 +134,9 @@ sigaction(p, uap, retval)
if ((error = copyin((caddr_t)uap->nsa, (caddr_t)sa,
sizeof (vec))))
return (error);
if ((signum == SIGKILL || signum == SIGSTOP) &&
sa->sa_handler != SIG_DFL)
return (EINVAL);
setsigvec(p, signum, sa);
}
return (0);
@ -343,8 +345,7 @@ osigvec(p, uap, retval)
int bit, error;
signum = uap->signum;
if (signum <= 0 || signum >= NSIG ||
signum == SIGKILL || signum == SIGSTOP)
if (signum <= 0 || signum >= NSIG)
return (EINVAL);
sv = &vec;
if (uap->osv) {
@ -372,6 +373,9 @@ osigvec(p, uap, retval)
if ((error = copyin((caddr_t)uap->nsv, (caddr_t)sv,
sizeof (vec))))
return (error);
if ((signum == SIGKILL || signum == SIGSTOP) &&
sv->sv_handler != SIG_DFL)
return (EINVAL);
#ifdef COMPAT_SUNOS
sv->sv_flags |= SA_USERTRAMP;
#endif