mirror of
https://github.com/gnif/LookingGlass.git
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97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
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/*
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KVMGFX Client - A KVM Client for VGA Passthrough
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Copyright (C) 2017-2019 Geoffrey McRae <geoff@hostfission.com>
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https://looking-glass.hostfission.com
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "common/crash.h"
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#include "common/debug.h"
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#include <execinfo.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ucontext.h>
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#include <unistd.h>
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/*
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Large portions of this code comes from @jschmier @ https://stackoverflow.com/a/1925461/637874
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*/
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/* This structure mirrors the one found in /usr/include/asm/ucontext.h */
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typedef struct _sig_ucontext
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{
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unsigned long uc_flags;
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struct ucontext *uc_link;
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stack_t uc_stack;
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struct sigcontext uc_mcontext;
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sigset_t uc_sigmask;
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}
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sig_ucontext_t;
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static void crit_err_hdlr(int sig_num, siginfo_t * info, void * ucontext)
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{
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void * array[50];
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void * caller_address;
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char ** messages;
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int size, i;
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sig_ucontext_t * uc;
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uc = (sig_ucontext_t *)ucontext;
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/* Get the address at the time the signal was raised */
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#if defined(__i386__) // gcc specific
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caller_address = (void *) uc->uc_mcontext.eip; // EIP: x86 specific
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#elif defined(__x86_64__) // gcc specific
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caller_address = (void *) uc->uc_mcontext.rip; // RIP: x86_64 specific
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#else
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#error Unsupported architecture. // TODO: Add support for other arch.
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#endif
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DEBUG_ERROR("signal %d (%s), address is %p from %p", sig_num, strsignal(sig_num), info->si_addr, (void *)caller_address);
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size = backtrace(array, 50);
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/* overwrite sigaction with caller's address */
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array[1] = caller_address;
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messages = backtrace_symbols(array, size);
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/* skip first stack frame (points here) */
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for (i = 1; i < size && messages != NULL; ++i)
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DEBUG_ERROR("[bt]: (%d) %s", i, messages[i]);
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free(messages);
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exit(EXIT_FAILURE);
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}
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bool installCrashHandler()
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{
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struct sigaction sigact;
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sigact.sa_sigaction = crit_err_hdlr;
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sigact.sa_flags = SA_RESTART | SA_SIGINFO;
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if (sigaction(SIGSEGV, &sigact, (struct sigaction *)NULL) != 0)
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{
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DEBUG_ERROR("Error setting signal handler for %d (%s)", SIGSEGV, strsignal(SIGSEGV));
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return false;
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}
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return true;
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}
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