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tests/tcg: take into account expected clashes pauth-4

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Pointer authentication isn't perfect so measure the percentage of
failed checks. As we want to vary the pointer we work through a bunch
of different addresses.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Robert Foley <robert.foley@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200225124710.14152-20-alex.bennee@linaro.org>
This commit is contained in:
Alex Bennée 2020-02-25 12:47:10 +00:00
parent a62f849dc5
commit bc97f9f64f
1 changed files with 37 additions and 17 deletions
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54
tests/tcg/aarch64/pauth-4.c
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@ -1,25 +1,45 @@
#include <stdint.h> #include <stdint.h>
#include <assert.h> #include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#define TESTS 1000
int main() int main()
{ {
uintptr_t x, y; int i, count = 0;
float perc;
void *base = malloc(TESTS);
asm("mov %0, lr\n\t" for (i = 0; i < TESTS; i++) {
"pacia %0, sp\n\t" /* sigill if pauth not supported */ uintptr_t in, x, y;
"eor %0, %0, #4\n\t" /* corrupt single bit */
"mov %1, %0\n\t"
"autia %1, sp\n\t" /* validate corrupted pointer */
"xpaci %0\n\t" /* strip pac from corrupted pointer */
: "=r"(x), "=r"(y));
/* in = i + (uintptr_t) base;
* Once stripped, the corrupted pointer is of the form 0x0000...wxyz.
* We expect the autia to indicate failure, producing a pointer of the asm("mov %0, %[in]\n\t"
* form 0x000e....wxyz. Use xpaci and != for the test, rather than "pacia %0, sp\n\t" /* sigill if pauth not supported */
* extracting explicit bits from the top, because the location of the "eor %0, %0, #4\n\t" /* corrupt single bit */
* error code "e" depends on the configuration of virtual memory. "mov %1, %0\n\t"
*/ "autia %1, sp\n\t" /* validate corrupted pointer */
assert(x != y); "xpaci %0\n\t" /* strip pac from corrupted pointer */
return 0; : /* out */ "=r"(x), "=r"(y)
: /* in */ [in] "r" (in)
: /* clobbers */);
/*
* Once stripped, the corrupted pointer is of the form 0x0000...wxyz.
* We expect the autia to indicate failure, producing a pointer of the
* form 0x000e....wxyz. Use xpaci and != for the test, rather than
* extracting explicit bits from the top, because the location of the
* error code "e" depends on the configuration of virtual memory.
*/
if (x != y) {
count++;
}
}
perc = (float) count / (float) TESTS;
printf("Checks Passed: %0.2f%%", perc * 100.0);
assert(perc > 0.95);
return 0;
} }