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42 lines
959 B
42 lines
959 B
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* This is for all the tests relating directly to Control Flow Integrity. |
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*/ |
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#include "lkdtm.h" |
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static int called_count; |
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/* Function taking one argument, without a return value. */ |
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static noinline void lkdtm_increment_void(int *counter) |
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{ |
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(*counter)++; |
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} |
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/* Function taking one argument, returning int. */ |
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static noinline int lkdtm_increment_int(int *counter) |
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{ |
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(*counter)++; |
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return *counter; |
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} |
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/* |
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* This tries to call an indirect function with a mismatched prototype. |
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*/ |
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void lkdtm_CFI_FORWARD_PROTO(void) |
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{ |
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/* |
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* Matches lkdtm_increment_void()'s prototype, but not |
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* lkdtm_increment_int()'s prototype. |
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*/ |
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void (*func)(int *); |
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pr_info("Calling matched prototype ...\n"); |
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func = lkdtm_increment_void; |
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func(&called_count); |
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pr_info("Calling mismatched prototype ...\n"); |
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func = (void *)lkdtm_increment_int; |
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func(&called_count); |
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pr_info("Fail: survived mismatched prototype function call!\n"); |
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}
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