diff options
| author | glebius <glebius@FreeBSD.org> | 2016-10-25 17:11:20 +0000 |
|---|---|---|
| committer | glebius <glebius@FreeBSD.org> | 2016-10-25 17:11:20 +0000 |
| commit | 166093516c6aacc3b4828524e9ddc45bfbdd279c (patch) | |
| tree | 3fc6fc37e3e5716d0163bc1ffee79a626d821657 /sys/amd64 | |
| parent | 1649f1572fc22ec9708f6f62c0fff2b55ac40096 (diff) | |
| download | FreeBSD-src-166093516c6aacc3b4828524e9ddc45bfbdd279c.zip FreeBSD-src-166093516c6aacc3b4828524e9ddc45bfbdd279c.tar.gz | |
Revised SA-16:15. The initial patch didn't cover all possible overflows
based on passing incorrect parameters to sysarch(2). [1]
Fix unchecked array reference in the VGA device emulation code. [2]
Security: SA-16:15 [1]
Security: SA-16:32 [2]
Approved by: so
Diffstat (limited to 'sys/amd64')
| -rw-r--r-- | sys/amd64/amd64/sys_machdep.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/sys/amd64/amd64/sys_machdep.c b/sys/amd64/amd64/sys_machdep.c index 4f85e1f..24009db 100644 --- a/sys/amd64/amd64/sys_machdep.c +++ b/sys/amd64/amd64/sys_machdep.c @@ -608,6 +608,8 @@ amd64_set_ldt(td, uap, descs) largest_ld = uap->start + uap->num; if (largest_ld > max_ldt_segment) largest_ld = max_ldt_segment; + if (largest_ld < uap->start) + return (EINVAL); i = largest_ld - uap->start; mtx_lock(&dt_lock); bzero(&((struct user_segment_descriptor *)(pldt->ldt_base)) @@ -620,7 +622,8 @@ amd64_set_ldt(td, uap, descs) /* verify range of descriptors to modify */ largest_ld = uap->start + uap->num; if (uap->start >= max_ldt_segment || - largest_ld > max_ldt_segment) + largest_ld > max_ldt_segment || + largest_ld < uap->start) return (EINVAL); } |
