| Message ID | 20210601094647.27238-1-szabolcs.nagy@arm.com |
|---|---|
| State | Committed |
| Commit | 3842ba494963b1d76ad5f68b8d1e5c2279160e31 |
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Subject: [COMMITTED] aarch64: align stack in clone [BZ #27939]
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From: Szabolcs Nagy via Libc-alpha <libc-alpha@sourceware.org>
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[COMMITTED] aarch64: align stack in clone [BZ #27939]
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Commit Message
Szabolcs Nagy
June 1, 2021, 9:46 a.m. UTC
The AArch64 PCS requires 16 byte aligned stack. Previously if the caller passed an unaligned stack to clone then the child crashed. Fixes bug 27939. --- sysdeps/unix/sysv/linux/aarch64/clone.S | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/sysdeps/unix/sysv/linux/aarch64/clone.S b/sysdeps/unix/sysv/linux/aarch64/clone.S index c9e63bae48..fe04bce6b6 100644 --- a/sysdeps/unix/sysv/linux/aarch64/clone.S +++ b/sysdeps/unix/sysv/linux/aarch64/clone.S @@ -47,6 +47,8 @@ ENTRY(__clone) /* Sanity check args. */ mov x0, #-EINVAL cbz x10, .Lsyscall_error + /* Align sp. */ + and x1, x1, -16 cbz x1, .Lsyscall_error /* Do the system call. */