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aarch64: Add GCS support to vfork

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Reviewed-by: Wilco Dijkstra <Wilco.Dijkstra@arm.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Szabolcs Nagy 2023-12-27 18:36:10 +00:00 • committed by Yury Khrustalev
parent 5ff5e7836e
commit 1cf59c2603
1 changed files with 6 additions and 1 deletions
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7
sysdeps/unix/sysv/linux/aarch64/vfork.S
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@ -33,8 +33,13 @@ ENTRY (__vfork)
cmn x0, #4095 cmn x0, #4095
b.cs .Lsyscall_error b.cs .Lsyscall_error
cbz x0, L(child)
RET RET
L(child):
/* Return with indirect branch in the child to support GCS.
Compilers insert BTI instruction after vfork() to make
sure return via BR works on systems with BTI. */
br x30
PSEUDO_END (__vfork) PSEUDO_END (__vfork)
libc_hidden_def (__vfork) libc_hidden_def (__vfork)