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tests: add tcg coverage for fixed mremap bugs

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These tests cover the first two fixes in this patch series. The final
patch is not covered because the bug it fixes is not easily observable
by the guest.

Signed-off-by: Matthew Lugg <mlugg@mlugg.co.uk>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20251117170954.31451-5-mlugg@mlugg.co.uk>
(cherry picked from commit 9290c10ae9d0c3ff433efbb7ecb0e781966c5404)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Matthew Lugg 2025-11-17 17:09:54 +00:00 • committed by Michael Tokarev
parent 860f8f3f53
commit 4cc64bd6c4
1 changed files with 40 additions and 2 deletions
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42
tests/tcg/multiarch/test-mmap.c
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@ -22,6 +22,7 @@
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
@ -41,7 +42,7 @@ do \
} \
} while (0)
unsigned char *dummybuf;
unsigned char *dummybuf; /* length is 2*pagesize */
static unsigned int pagesize;
static unsigned int pagemask;
int test_fd;
@ -451,9 +452,45 @@ void check_invalid_mmaps(void)
fail_unless(addr == MAP_FAILED);
fail_unless(errno == ENOMEM);
/* Attempt to remap a region which exceeds the bounds of memory. */
addr = mremap((void *)((uintptr_t)pagesize * 10), SIZE_MAX & ~(size_t)pagemask, pagesize, 0);
fprintf(stdout, "%s mremap addr=%p", __func__, (void *)addr);
fail_unless(addr == MAP_FAILED);
fail_unless(errno == EFAULT);
fprintf(stdout, " passed\n");
}
void check_shrink_mmaps(void)
{
unsigned char *a, *b, *c;
a = mmap(NULL, pagesize * 2, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
b = mmap(NULL, pagesize * 2, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
c = mmap(NULL, pagesize * 2, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
fail_unless(a != MAP_FAILED);
fail_unless(b != MAP_FAILED);
fail_unless(c != MAP_FAILED);
/* Ensure we can read the full mappings */
memcpy(dummybuf, a, 2 * pagesize);
memcpy(dummybuf, b, 2 * pagesize);
memcpy(dummybuf, c, 2 * pagesize);
/* Shrink the middle mapping in-place; the others should be unaffected */
b = mremap(b, pagesize * 2, pagesize, 0);
fail_unless(b != MAP_FAILED);
/* Ensure we can still access all valid mappings */
memcpy(dummybuf, a, 2 * pagesize);
memcpy(dummybuf, b, pagesize);
memcpy(dummybuf, c, 2 * pagesize);
munmap(a, 2 * pagesize);
munmap(b, pagesize);
munmap(c, 2 * pagesize);
}
int main(int argc, char **argv)
{
char tempname[] = "/tmp/.cmmapXXXXXX";
@ -468,7 +505,7 @@ int main(int argc, char **argv)
/* Assume pagesize is a power of two. */
pagemask = pagesize - 1;
dummybuf = malloc (pagesize);
dummybuf = malloc (pagesize * 2);
printf ("pagesize=%u pagemask=%x\n", pagesize, pagemask);
test_fd = mkstemp(tempname);
@ -496,6 +533,7 @@ int main(int argc, char **argv)
check_file_fixed_eof_mmaps();
check_file_unfixed_eof_mmaps();
check_invalid_mmaps();
check_shrink_mmaps();
/* Fails at the moment. */
/* check_aligned_anonymous_fixed_mmaps_collide_with_host(); */