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Add stack smash protection support.

This commit is contained in:
Jonas 'Sortie' Termansen 2014-10-22 00:00:33 +02:00
parent 9b6d60d9d2
commit 5a3e181975
2 changed files with 66 additions and 1 deletions
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3
libc/Makefile
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@ -71,10 +71,11 @@ signal/sigisemptyset.o \
signal/sigismember.o \
signal/signotset.o \
signal/sigorset.o \
ssp/__stack_chk_fail.o \
stdio/asprintf.o \
stdio/cbprintf.o \
stdio/clearerr.o \
stdio/clearerr_unlocked.o \
stdio/cbprintf.o \
stdio/dprintf.o \
stdio_ext/__fbufsize.o \
stdio_ext/__fpending.o \

64
libc/ssp/__stack_chk_fail.cpp Normal file
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@ -0,0 +1,64 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2014, 2015.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
ssp/__stack_chk_fail.cpp
Abnormally terminate the process on stack smashing.
*******************************************************************************/
#include <errno.h>
#include <fcntl.h>
#include <scram.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <__/wordsize.h>
#if defined(__is_sortix_kernel)
#include <sortix/kernel/log.h>
#include <sortix/kernel/panic.h>
#endif
#if __WORDSIZE == 32
#define STACK_CHK_GUARD 0x01234567
#elif __WORDSIZE == 64
#define STACK_CHK_GUARD 0x0123456789ABCDEF
#endif
#if __STDC_HOSTED__
/* TODO: Have this filled in by the program loader. */
#else
/* TODO: Have this filled in by the boot loader. */
#endif
extern "C" { uintptr_t __stack_chk_guard = STACK_CHK_GUARD; }
extern "C" __attribute__((noreturn))
void __stack_chk_fail(void)
{
#if __STDC_HOSTED__
scram(SCRAM_STACK_SMASH, NULL);
#elif defined(__is_sortix_kernel)
Sortix::Panic("Stack smashing detected");
#else
#warning "You need to implement a stack smash reporting mechanism"
abort();
#endif
}