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35 lines
1.2 KiB
35 lines
1.2 KiB
From 3288c6da64add3b4561b8c10fff522027caea01c Mon Sep 17 00:00:00 2001
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From: Nicholas Miell <nmiell@gmail.com>
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Date: Sat, 17 Jun 2017 18:21:07 -0700
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Subject: [PATCH] Align the stack on entry to __tls_get_addr()
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Old versions of gcc (4 & 5) didn't align the stack according to the
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AMD64 psABI when calling __tls_get_addr(). Apparently new versions of
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gcc (7) got much more aggressive about vectorizing and generating MOVAPS
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instructions, which means old binaries built with the buggy versions of
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gcc are much more likely to crash when using versions of glibc built
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using gcc 7.
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For example, a large number of Linux games built using the Unity game
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engine and available for purchase on Steam.
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---
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elf/dl-tls.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/elf/dl-tls.c b/elf/dl-tls.c
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index 5aba33b3fa..3f3cb917de 100644
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--- a/elf/dl-tls.c
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+++ b/elf/dl-tls.c
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@@ -827,6 +827,10 @@ rtld_hidden_proto (__tls_get_addr)
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rtld_hidden_def (__tls_get_addr)
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#endif
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+#ifdef __x86_64__
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+/* Old versions of gcc didn't align the stack. */
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+__attribute__((force_align_arg_pointer))
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+#endif
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/* The generic dynamic and local dynamic model cannot be used in
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statically linked applications. */
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void *
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--
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2.13.0
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