[PATCH v4 2/9] selftest/mremap_test: Avoid crash with static build
From: Aneesh Kumar K.V <hidden>
Date: 2021-04-14 08:59:39
Also in:
linux-mm
Subsystem:
kernel selftest framework, the rest · Maintainers:
Shuah Khan, Linus Torvalds
With a large mmap map size, we can overlap with the text area and using MAP_FIXED results in unmapping that area. Switch to MAP_FIXED_NOREPLACE and handle the EEXIST error. Reviewed-by: Kalesh Singh <redacted> Signed-off-by: Aneesh Kumar K.V <redacted> --- tools/testing/selftests/vm/mremap_test.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/vm/mremap_test.c b/tools/testing/selftests/vm/mremap_test.c
index c9a5461eb786..0624d1bd71b5 100644
--- a/tools/testing/selftests/vm/mremap_test.c
+++ b/tools/testing/selftests/vm/mremap_test.c@@ -75,9 +75,10 @@ static void *get_source_mapping(struct config c) retry: addr += c.src_alignment; src_addr = mmap((void *) addr, c.region_size, PROT_READ | PROT_WRITE, - MAP_FIXED | MAP_ANONYMOUS | MAP_SHARED, -1, 0); + MAP_FIXED_NOREPLACE | MAP_ANONYMOUS | MAP_SHARED, + -1, 0); if (src_addr == MAP_FAILED) { - if (errno == EPERM) + if (errno == EPERM || errno == EEXIST) goto retry; goto error; }
--
2.30.2