mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 22:02:44 +00:00
79 lines
2 KiB
Diff
79 lines
2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Brian Gianforcaro <b.gianfo@gmail.com>
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Date: Sat, 19 Feb 2022 19:46:06 -0800
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Subject: [PATCH] gdb: Disable xmalloc for alternate_signal_stack for serenity
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---
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gdbsupport/alt-stack.h | 37 ++++++++++++++++++++++++++-----------
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1 file changed, 26 insertions(+), 11 deletions(-)
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diff --git a/gdbsupport/alt-stack.h b/gdbsupport/alt-stack.h
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index 8ae229b..6e5b133 100644
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--- a/gdbsupport/alt-stack.h
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+++ b/gdbsupport/alt-stack.h
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@@ -20,7 +20,9 @@
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#ifndef GDBSUPPORT_ALT_STACK_H
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#define GDBSUPPORT_ALT_STACK_H
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+#include "common-defs.h"
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#include <signal.h>
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+#include <sys/mman.h>
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namespace gdb
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{
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@@ -36,31 +38,44 @@ class alternate_signal_stack
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public:
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alternate_signal_stack ()
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{
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+ // We can't use xmalloc here on Serenity, because stack regions
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+ // do not play well with how malloc manages its memory.
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#ifdef HAVE_SIGALTSTACK
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- m_stack.reset ((char *) xmalloc (SIGSTKSZ));
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-
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- stack_t stack;
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- stack.ss_sp = m_stack.get ();
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- stack.ss_size = SIGSTKSZ;
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- stack.ss_flags = 0;
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-
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- sigaltstack (&stack, &m_old_stack);
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+ void *ptr = mmap (nullptr, SIGSTKSZ, PROT_READ | PROT_WRITE,
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+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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+ if (ptr == MAP_FAILED)
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+ {
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+ warning ("could not mmap alternate signal stack");
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+ }
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+ else
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+ {
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+ m_stack = ptr;
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+ stack_t stack;
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+ stack.ss_sp = m_stack;
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+ stack.ss_size = SIGSTKSZ;
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+ stack.ss_flags = 0;
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+
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+ sigaltstack (&stack, &m_old_stack);
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+ }
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#endif
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}
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~alternate_signal_stack ()
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{
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#ifdef HAVE_SIGALTSTACK
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- sigaltstack (&m_old_stack, nullptr);
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+ if (m_stack != nullptr)
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+ {
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+ sigaltstack (&m_old_stack, nullptr);
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+ munmap (m_stack, SIGSTKSZ);
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+ }
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#endif
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}
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DISABLE_COPY_AND_ASSIGN (alternate_signal_stack);
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private:
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-
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#ifdef HAVE_SIGALTSTACK
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- gdb::unique_xmalloc_ptr<char> m_stack;
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+ void *m_stack{ nullptr };
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stack_t m_old_stack;
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#endif
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};
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