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nosys(): add kern.signosys tunable/sysctl to control SIGSYS

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(cherry picked from commit 5804a1623054d865618d77cfac86978f03b8111a)
This commit is contained in:
Konstantin Belousov 2023-09-25 19:36:04 +03:00
parent 45ebb15ab1
commit 3911b00c0a
1 changed files with 5 additions and 1 deletions
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6
sys/kern/kern_sig.c
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@ -159,6 +159,10 @@ static int kern_lognosys = 0;
SYSCTL_INT(_kern, OID_AUTO, lognosys, CTLFLAG_RWTUN, &kern_lognosys, 0,
"Log invalid syscalls");
static int kern_signosys = 1;
SYSCTL_INT(_kern, OID_AUTO, signosys, CTLFLAG_RWTUN, &kern_signosys, 0,
"Send SIGSYS on return from invalid syscall");
__read_frequently bool sigfastblock_fetch_always = false;
SYSCTL_BOOL(_kern, OID_AUTO, sigfastblock_fetch_always, CTLFLAG_RWTUN,
&sigfastblock_fetch_always, 0,
@ -4219,7 +4223,7 @@ nosys(struct thread *td, struct nosys_args *args)
p = td->td_proc;
if (SV_PROC_FLAG(p, SV_SIGSYS) != 0) {
if (SV_PROC_FLAG(p, SV_SIGSYS) != 0 && kern_signosys) {
PROC_LOCK(p);
tdsignal(td, SIGSYS);
PROC_UNLOCK(p);