Author: trasz
Date: Sat Aug 15 17:02:23 2020
New Revision: 364258
URL: https://svnweb.freebsd.org/changeset/base/364258
Log:
MFC r351783:
Unbreak Linux binaries linked against new glibc, such as the ones
from recent Ubuntu versions. Without it they segfault on startup.
Sponsored by: The FreeBSD Foundation
Modified:
stable/12/sys/amd64/linux/linux_sysvec.c
Directory Properties:
stable/12/ (props changed)
Modified: stable/12/sys/amd64/linux/linux_sysvec.c
==============================================================================
--- stable/12/sys/amd64/linux/linux_sysvec.c Sat Aug 15 16:48:58 2020
(r364257)
+++ stable/12/sys/amd64/linux/linux_sysvec.c Sat Aug 15 17:02:23 2020
(r364258)
@@ -357,6 +357,12 @@ linux_copyout_strings(struct image_params *imgp)
*/
vectp -= imgp->args->argc + 1 + imgp->args->envc + 1;
+ /*
+ * Starting with 2.24, glibc depends on a 16-byte stack alignment.
+ * One "long argc" will be prepended later.
+ */
+ vectp = (char **)((((uintptr_t)vectp + 8) & ~0xF) - 8);
+
/* vectp also becomes our initial stack base. */
stack_base = (register_t *)vectp;
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