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emacs-26 a6632fee28: Port alternate signal stack to upcoming glibc 2.34
From: |
Stefan Kangas |
Subject: |
emacs-26 a6632fee28: Port alternate signal stack to upcoming glibc 2.34 |
Date: |
Fri, 15 Jul 2022 08:02:38 -0400 (EDT) |
branch: emacs-26
commit a6632fee28d5c0befa192c92692e4204656a29a0
Author: Paul Eggert <eggert@cs.ucla.edu>
Commit: Stefan Kangas <stefan@marxist.se>
Port alternate signal stack to upcoming glibc 2.34
* src/sysdep.c (sigsegv_stack): Increase size to 64 KiB and align
it to max_align_t. This copies from Gnulib’s c-stack.c, and works
around a portability bug in draft glibc 2.34, which no longer
defines SIGSTKSZ when _GNU_SOURCE is defined.
(cherry picked from commit f97e07ea807cc6d38774a3888a15091b20645ac6)
---
src/sysdep.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/src/sysdep.c b/src/sysdep.c
index b2aecc0dda..1f7f02cb00 100644
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -1792,7 +1792,15 @@ handle_arith_signal (int sig)
/* Alternate stack used by SIGSEGV handler below. */
-static unsigned char sigsegv_stack[SIGSTKSZ];
+/* Storage for the alternate signal stack.
+ 64 KiB is not too large for Emacs, and is large enough
+ for all known platforms. Smaller sizes may run into trouble.
+ For example, libsigsegv 2.6 through 2.8 have a bug where some
+ architectures use more than the Linux default of an 8 KiB alternate
+ stack when deciding if a fault was caused by stack overflow. */
+static max_align_t sigsegv_stack[(64 * 1024
+ + sizeof (max_align_t) - 1)
+ / sizeof (max_align_t)];
/* Return true if SIGINFO indicates a stack overflow. */
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