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| author | Theo de Raadt <deraadt@cvs.openbsd.org> | 2020-10-18 14:28:19 +0000 |
|---|---|---|
| committer | Theo de Raadt <deraadt@cvs.openbsd.org> | 2020-10-18 14:28:19 +0000 |
| commit | 81a42b0abcdedc2a5538a98fa140b5c905c37f13 (patch) | |
| tree | 13de44cacdce2db993f272ce7e0db0df213b0388 /lib/libc/arch/amd64 | |
| parent | 81c0077baa3d0d74d74a14320f14425416016856 (diff) | |
SYS___threxit cannot fail, but this integration looks like a gadget.
Put a hard-trap instruction after the syscall instruction.
ok kettenis mortimer
Diffstat (limited to 'lib/libc/arch/amd64')
| -rw-r--r-- | lib/libc/arch/amd64/sys/tfork_thread.S | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/libc/arch/amd64/sys/tfork_thread.S b/lib/libc/arch/amd64/sys/tfork_thread.S index 647f070cbcc..b543296b04e 100644 --- a/lib/libc/arch/amd64/sys/tfork_thread.S +++ b/lib/libc/arch/amd64/sys/tfork_thread.S @@ -1,4 +1,4 @@ -/* $OpenBSD: tfork_thread.S,v 1.9 2020/10/01 01:05:40 guenther Exp $ */ +/* $OpenBSD: tfork_thread.S,v 1.10 2020/10/18 14:28:17 deraadt Exp $ */ /*- * Copyright (c) 2000 Peter Wemm <peter@FreeBSD.org> * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu> @@ -89,6 +89,7 @@ ENTRY(__tfork_thread) movl $SYS___threxit, %eax xorl %edi, %edi syscall + int3 /* * Branch here if the thread creation fails: |