Date: Fri, 30 May 2014 18:59:38 +0000 (UTC) From: Neel Natu <neel@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r266901 - head/sys/amd64/amd64 Message-ID: <201405301859.s4UIxcqs019723@svn.freebsd.org>
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Author: neel Date: Fri May 30 18:59:37 2014 New Revision: 266901 URL: http://svnweb.freebsd.org/changeset/base/266901 Log: Allocate a zeroed LDT. Failing to do this might result in the LDT appearing to run out of free descriptors because of random junk in the descriptor's 'sd_type' field. http://lists.freebsd.org/pipermail/freebsd-amd64/2014-May/016088.html Reviewed by: kib MFC after: 2 weeks Modified: head/sys/amd64/amd64/sys_machdep.c Modified: head/sys/amd64/amd64/sys_machdep.c ============================================================================== --- head/sys/amd64/amd64/sys_machdep.c Fri May 30 18:14:15 2014 (r266900) +++ head/sys/amd64/amd64/sys_machdep.c Fri May 30 18:59:37 2014 (r266901) @@ -462,7 +462,7 @@ user_ldt_alloc(struct proc *p, int force new_ldt = malloc(sizeof(struct proc_ldt), M_SUBPROC, M_WAITOK); new_ldt->ldt_base = (caddr_t)kmem_malloc(kernel_arena, max_ldt_segment * sizeof(struct user_segment_descriptor), - M_WAITOK); + M_WAITOK | M_ZERO); if (new_ldt->ldt_base == NULL) { FREE(new_ldt, M_SUBPROC); mtx_lock(&dt_lock);
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