Date: Tue, 28 Feb 2017 22:54:52 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r314429 - in head/sys: amd64/amd64 i386/i386 Message-ID: <201702282254.v1SMsq0l086613@repo.freebsd.org>
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Author: kib Date: Tue Feb 28 22:54:52 2017 New Revision: 314429 URL: https://svnweb.freebsd.org/changeset/base/314429 Log: Initialize pcb_save for thread0. Otherwise kernel traps on NULL dereference if fpu_kern(9) is used from the thread0 context. Reported by: cem Reviewed by: cem, jhb Sponsored by: The FreeBSD Foundation MFC after: 1 week Modified: head/sys/amd64/amd64/machdep.c head/sys/i386/i386/machdep.c Modified: head/sys/amd64/amd64/machdep.c ============================================================================== --- head/sys/amd64/amd64/machdep.c Tue Feb 28 22:49:45 2017 (r314428) +++ head/sys/amd64/amd64/machdep.c Tue Feb 28 22:54:52 2017 (r314429) @@ -1734,6 +1734,7 @@ hammer_time(u_int64_t modulep, u_int64_t * area. */ thread0.td_pcb = get_pcb_td(&thread0); + thread0.td_pcb->pcb_save = get_pcb_user_save_td(&thread0); bzero(get_pcb_user_save_td(&thread0), cpu_max_ext_state_size); if (use_xsave) { xhdr = (struct xstate_hdr *)(get_pcb_user_save_td(&thread0) + Modified: head/sys/i386/i386/machdep.c ============================================================================== --- head/sys/i386/i386/machdep.c Tue Feb 28 22:49:45 2017 (r314428) +++ head/sys/i386/i386/machdep.c Tue Feb 28 22:54:52 2017 (r314429) @@ -2420,6 +2420,7 @@ init386(int first) * area. */ thread0.td_pcb = get_pcb_td(&thread0); + thread0.td_pcb->pcb_save = get_pcb_user_save_td(&thread0); bzero(get_pcb_user_save_td(&thread0), cpu_max_ext_state_size); if (use_xsave) { xhdr = (struct xstate_hdr *)(get_pcb_user_save_td(&thread0) +
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