Date: Thu, 20 Jul 2023 19:04:25 GMT From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: db6c7c7f8d87 - main - vmspace_fork(): do not override offset for the guard entries Message-ID: <202307201904.36KJ4PoX070511@gitrepo.freebsd.org>
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The branch main has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=db6c7c7f8d870f377fcd1cc98e4832681bb5bdf0 commit db6c7c7f8d870f377fcd1cc98e4832681bb5bdf0 Author: Konstantin Belousov <kib@FreeBSD.org> AuthorDate: 2023-07-20 17:45:01 +0000 Commit: Konstantin Belousov <kib@FreeBSD.org> CommitDate: 2023-07-20 19:04:03 +0000 vmspace_fork(): do not override offset for the guard entries The offset field contains protection for the stack guards. Reported by: cy Fixes: 21e45c30c35c9aa732073f725924caf581c93460 MFC after: 1 week --- sys/vm/vm_map.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/sys/vm/vm_map.c b/sys/vm/vm_map.c index 997a49111a59..444e09986d4e 100644 --- a/sys/vm/vm_map.c +++ b/sys/vm/vm_map.c @@ -4181,7 +4181,8 @@ vm_map_copy_entry( src_entry->start); } else { dst_entry->object.vm_object = NULL; - dst_entry->offset = 0; + if ((dst_entry->eflags & MAP_ENTRY_GUARD) == 0) + dst_entry->offset = 0; if (src_entry->cred != NULL) { dst_entry->cred = curthread->td_ucred; crhold(dst_entry->cred);
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