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25 lines
788 B
25 lines
788 B
9 months ago
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commit 3842ba494963b1d76ad5f68b8d1e5c2279160e31
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Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
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Date: Tue Jun 1 09:23:40 2021 +0100
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aarch64: align stack in clone [BZ #27939]
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The AArch64 PCS requires 16 byte aligned stack. Previously if the
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caller passed an unaligned stack to clone then the child crashed.
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Fixes bug 27939.
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diff --git a/sysdeps/unix/sysv/linux/aarch64/clone.S b/sysdeps/unix/sysv/linux/aarch64/clone.S
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index e0653048259dd9a3..4a1a999447ee5cf1 100644
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--- a/sysdeps/unix/sysv/linux/aarch64/clone.S
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+++ b/sysdeps/unix/sysv/linux/aarch64/clone.S
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@@ -48,6 +48,8 @@ ENTRY(__clone)
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/* Sanity check args. */
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mov x0, #-EINVAL
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cbz x10, .Lsyscall_error
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+ /* Align sp. */
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+ and x1, x1, -16
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cbz x1, .Lsyscall_error
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/* Do the system call. */
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