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* [glibc/arm/gcs] aarch64: Add GCS support to vfork
@ 2024-02-14 15:06 Szabolcs Nagy
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From: Szabolcs Nagy @ 2024-02-14 15:06 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=868c129b90a52f7c30b8a560dc580f851db4b6fc
commit 868c129b90a52f7c30b8a560dc580f851db4b6fc
Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date: Wed Dec 27 18:36:10 2023 +0000
aarch64: Add GCS support to vfork
Diff:
---
sysdeps/unix/sysv/linux/aarch64/vfork.S | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/sysdeps/unix/sysv/linux/aarch64/vfork.S b/sysdeps/unix/sysv/linux/aarch64/vfork.S
index e71e492da3..cfaf4a1ffb 100644
--- a/sysdeps/unix/sysv/linux/aarch64/vfork.S
+++ b/sysdeps/unix/sysv/linux/aarch64/vfork.S
@@ -33,8 +33,14 @@ ENTRY (__vfork)
cmn x0, #4095
b.cs .Lsyscall_error
+ cbz x0, L(child)
RET
-
+L(child):
+ /* Return with indirect branch in the child to support GCS.
+ Clear x30 to crash early if the child tries to ret. */
+ mov x1, x30
+ mov x30, 0
+ br x1
PSEUDO_END (__vfork)
libc_hidden_def (__vfork)
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