The patch titled
Subject: selftest/mremap_test: avoid crash with static build
has been added to the -mm tree. Its filename is
selftest-mremap_test-avoid-crash-with-static-build.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/selftest-mremap_test-avoid-crash-with-static-build.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/selftest-mremap_test-avoid-crash-with-static-build.patch
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------------------------------------------------------
From: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxx>
Subject: selftest/mremap_test: avoid crash with static build
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.
Link: https://lkml.kernel.org/r/20210422054323.150993-3-aneesh.kumar@xxxxxxxxxxxxx
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
Reviewed-by: Kalesh Singh <kaleshsingh@xxxxxxxxxx>
Cc: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Cc: Joel Fernandes <joel@xxxxxxxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/vm/mremap_test.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/tools/testing/selftests/vm/mremap_test.c~selftest-mremap_test-avoid-crash-with-static-build
+++ a/tools/testing/selftests/vm/mremap_test.c
@@ -75,9 +75,10 @@ static void *get_source_mapping(struct 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;
}
_
Patches currently in -mm which might be from aneesh.kumar@xxxxxxxxxxxxx are
selftest-mremap_test-update-the-test-to-handle-pagesize-other-than-4k.patch
selftest-mremap_test-avoid-crash-with-static-build.patch
mm-mremap-use-pmd-pud_poplulate-to-update-page-table-entries.patch
powerpc-mm-book3s64-fix-possible-build-error.patch
powerpc-mm-book3s64-update-tlb-flush-routines-to-take-a-page-walk-cache-flush-argument.patch
mm-mremap-use-range-flush-that-does-tlb-and-page-walk-cache-flush.patch
mm-mremap-move-tlb-flush-outside-page-table-lock.patch
mm-mremap-allow-arch-runtime-override.patch
powerpc-mm-enable-move-pmd-pud.patch
