On READ_IMPLIES_EXEC systems, the readable test VMA already has
PROT_EXEC. The replacement mapping therefore does not create a split.
Use PROT_NONE instead; it cannot merge with the readable neighbors.
Tested on QEMU versatilepb with ARM926, and on
realview-eb-mpcore with ARM11MPCore.
Fixes: beb69e817246 ("selftests/proc: add /proc/pid/maps tearing from vma split
test")
Assisted-by: Codex:GPT-5
Signed-off-by: Karl Mehltretter <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Cc: Liam R. Howlett <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
---
tools/testing/selftests/proc/proc-maps-race.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/proc/proc-maps-race.c
b/tools/testing/selftests/proc/proc-maps-race.c
index 1026d8c400e1..415eccb70468 100644
--- a/tools/testing/selftests/proc/proc-maps-race.c
+++ b/tools/testing/selftests/proc/proc-maps-race.c
@@ -490,7 +490,8 @@ static bool query_addr_at(int maps_fd, void *addr,
static inline bool split_vma(FIXTURE_DATA(proc_maps_race) *self)
{
- return mmap(self->mod_info->addr, self->page_size, self->mod_info->prot
| PROT_EXEC,
+ /* PROT_NONE differs from both readable neighbors. */
+ return mmap(self->mod_info->addr, self->page_size, PROT_NONE,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0) !=
MAP_FAILED;
}
--
2.53.0
