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HBSD SEGVGUARD: Check if SEGVGUARD is active before doing any work

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Simply move the check if SEGVGUARD is active to the top of the functions
that utilize the check. No need to waste CPU cycles if SEGVGUARD isn't
active.

Signed-off-by:	Shawn Webb <shawn.webb@hardenedbsd.org>
MFC-to:		10-STABLE
MFC-to:		11-STABLE
(cherry picked from commit 94ec671827b6e75e180324424847c6210c3ffaca)
This commit is contained in:
Shawn Webb 2016-12-20 19:15:40 -05:00 committed by Shawn Webb
parent 21077f2f71
commit 5abb3d76c5
No known key found for this signature in database
GPG key ID: 411DCD7D5C3BFCB6
1 changed files with 6 additions and 6 deletions
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12
sys/hardenedbsd/hbsd_pax_segvguard.c
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@ -444,15 +444,15 @@ pax_segvguard_segfault(struct thread *td, const char *name)
struct vnode *v;
sbintime_t sbt;
if (pax_segvguard_active(td->td_proc) == false)
return (0);
v = td->td_proc->p_textvp;
if (v == NULL)
return (EFAULT);
pr = pax_get_prison_td(td);
if (pax_segvguard_active(td->td_proc) == false)
return (0);
sbt = sbinuptime();
se = pax_segvguard_lookup(td, v);
@ -495,12 +495,12 @@ pax_segvguard_check(struct thread *td, struct vnode *v, const char *name)
struct pax_segvguard_entry *se;
sbintime_t sbt;
if (v == NULL)
return (EFAULT);
if (pax_segvguard_active(td->td_proc) == false)
return (0);
if (v == NULL)
return (EFAULT);
sbt = sbinuptime();
se = pax_segvguard_lookup(td, v);