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From: Szabolcs Nagy <nsz@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc] aarch64: align stack in clone [BZ #27939] Date: Tue, 1 Jun 2021 09:45:30 +0000 (GMT) [thread overview] Message-ID: <20210601094530.58698385802E@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=3842ba494963b1d76ad5f68b8d1e5c2279160e31 commit 3842ba494963b1d76ad5f68b8d1e5c2279160e31 Author: Szabolcs Nagy <szabolcs.nagy@arm.com> Date: Tue Jun 1 09:23:40 2021 +0100 aarch64: align stack in clone [BZ #27939] 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. Diff: --- 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. */
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