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If > ftruncate() fails, the file may remain shorter than the requested > mapping size. The subsequent mmap() with MAP_SHARED can still > succeed in this case, but the very next line writes directly into > the mapped memory (*map = 1), which can trigger SIGBUS if the > mapping extends beyond the actual file size. > > Check the return value and fail cleanly with ksft_exit_fail_msg() if > ftruncate() fails, matching the error-handling style already used > for the mmap() call immediately below it. > > Signed-off-by: Anshuman > --- Looks good to me. Reviewed-by: Sarthak Sharma > tools/testing/selftests/mm/soft-dirty.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/tools/testing/selftests/mm/soft-dirty.c b/tools/testing/selftests/mm/soft-dirty.c > index fb1864a68..a52ef79dd 100644 > --- a/tools/testing/selftests/mm/soft-dirty.c > +++ b/tools/testing/selftests/mm/soft-dirty.c > @@ -152,7 +152,8 @@ static void test_mprotect(int pagemap_fd, int pagesize, bool anon) > return; > } > unlink(fname); > - ftruncate(test_fd, pagesize); > + if (ftruncate(test_fd, pagesize) != 0) > + ksft_exit_fail_msg("ftruncate failed\n"); > map = mmap(NULL, pagesize, PROT_READ|PROT_WRITE, > MAP_SHARED, test_fd, 0); > if (map == MAP_FAILED)