Author: glebius Date: Tue Oct 25 17:14:50 2016 New Revision: 307938 URL: https://svnweb.freebsd.org/changeset/base/307938
Log: Merge r307936: The argument validation in r296956 was not enough to close all possible overflows in sysarch(2). Submitted by: Kun Yang <kun.yang chaitin.com> Patch by: kib Security: SA-16:15 Modified: stable/11/sys/amd64/amd64/sys_machdep.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/amd64/amd64/sys_machdep.c ============================================================================== --- stable/11/sys/amd64/amd64/sys_machdep.c Tue Oct 25 17:13:58 2016 (r307937) +++ stable/11/sys/amd64/amd64/sys_machdep.c Tue Oct 25 17:14:50 2016 (r307938) @@ -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); } _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"