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master f97e07e: Port alternate signal stack to upcoming glibc 2.34
From: |
Paul Eggert |
Subject: |
master f97e07e: Port alternate signal stack to upcoming glibc 2.34 |
Date: |
Tue, 9 Mar 2021 14:26:38 -0500 (EST) |
branch: master
commit f97e07ea807cc6d38774a3888a15091b20645ac6
Author: Paul Eggert <eggert@cs.ucla.edu>
Commit: Paul Eggert <eggert@cs.ucla.edu>
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.
---
src/sysdep.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/src/sysdep.c b/src/sysdep.c
index 941b4e2..24d8832 100644
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -1785,7 +1785,15 @@ 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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