git: db6c7c7f8d87 - main - vmspace_fork(): do not override offset for the guard entries
- Go to: [ bottom of page ] [ top of archives ] [ this month ]
Date: Thu, 20 Jul 2023 19:04:25 UTC
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);