mirror of
https://source.denx.de/u-boot/u-boot.git
synced 2025-11-04 10:21:25 +01:00
2fc62f2991
With better compiler optimizations available, a compiler may see we do nothing with our buffer after calling memset and omit the call, thus causing us to not smash the stack. Add a comment to explain why we now also have a printf call, so that the test will pass as the memset will not be omitted. Reported-by: Marek Behún <marek.behun@nic.cz> Signed-off-by: Tom Rini <trini@konsulko.com>
27 lines
594 B
C
27 lines
594 B
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright 2021 Broadcom
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <command.h>
|
|
|
|
static int do_test_stackprot_fail(struct cmd_tbl *cmdtp, int flag, int argc,
|
|
char *const argv[])
|
|
{
|
|
/*
|
|
* In order to avoid having the compiler optimize away the stack smashing
|
|
* we need to do a little something here.
|
|
*/
|
|
char a[128];
|
|
|
|
memset(a, 0xa5, 512);
|
|
|
|
printf("We have smashed our stack as this should not exceed 128: sizeof(a) = %ld\n", strlen(a));
|
|
|
|
return 0;
|
|
}
|
|
|
|
U_BOOT_CMD(stackprot_test, 1, 1, do_test_stackprot_fail,
|
|
"test stack protector fail", "");
|