b640728151
Pointer authentication isn't guaranteed to always detect a clash between different keys. Take this into account in the test by running several times and checking the percentage hit rate of the test. Cc: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
38 lines
752 B
C
38 lines
752 B
C
#include <assert.h>
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#include <sys/prctl.h>
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#include <stdio.h>
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asm(".arch armv8.4-a");
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#ifndef PR_PAC_RESET_KEYS
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#define PR_PAC_RESET_KEYS 54
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#define PR_PAC_APDAKEY (1 << 2)
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#endif
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#define TESTS 1000
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int main()
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{
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int x, i, count = 0;
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void *p0 = &x, *p1, *p2;
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float perc;
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for (i = 0; i < TESTS; i++) {
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asm volatile("pacdza %0" : "=r"(p1) : "0"(p0));
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prctl(PR_PAC_RESET_KEYS, PR_PAC_APDAKEY, 0, 0, 0);
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asm volatile("pacdza %0" : "=r"(p2) : "0"(p0));
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if (p1 != p0) {
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count++;
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}
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if (p1 != p2) {
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count++;
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}
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}
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perc = (float) count / (float) (TESTS * 2);
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printf("Ptr Check: %0.2f%%", perc * 100.0);
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assert(perc > 0.95);
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return 0;
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}
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