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[77.2.96.157]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4954a2edbe4sm274394275e9.12.2026.07.19.23.19.55 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Sun, 19 Jul 2026 23:19:55 -0700 (PDT) From: Karl Mehltretter To: Cc: Karl Mehltretter , Shuah Khan , Suren Baghdasaryan , "Liam R . Howlett" , Andrew Morton , linux-kselftest@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] selftests/proc: make proc-maps-race work with READ_IMPLIES_EXEC Date: Mon, 20 Jul 2026 08:18:35 +0200 Message-Id: <20260720061835.6290-1-kmehltretter@gmail.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Liam R. Howlett Cc: Andrew Morton Cc: linux-kselftest@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org Cc: linux-kernel@vger.kernel.org --- 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