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) + _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"