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https://github.com/brain-hackers/u-boot-brain
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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+
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/*
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* Copyright 2021 Broadcom
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*/
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#include <common.h>
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#include <command.h>
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static int do_test_stackprot_fail(struct cmd_tbl *cmdtp, int flag, int argc,
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char *const argv[])
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{
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/*
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* In order to avoid having the compiler optimize away the stack smashing
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* we need to do a little something here.
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*/
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char a[128];
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memset(a, 0xa5, 512);
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printf("We have smashed our stack as this should not exceed 128: sizeof(a) = %ld\n", strlen(a));
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return 0;
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}
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U_BOOT_CMD(stackprot_test, 1, 1, do_test_stackprot_fail,
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"test stack protector fail", "");
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