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AJvYcCXWj0lOQ3Yp+WzZFrynJgGQkz4MSFIcj5CzMRrxpW3hfHFit0Yz0kG/j9Xde1jWbMFw2INmrJ7kXH5HVME=@vger.kernel.org X-Gm-Message-State: AOJu0YwHzfZF4BhKIfgiXKwZKJqpYlCSARKup518HcMJw4ftNBY3sH5h 3JuNCHRy1mlW0JkNJOL3eZ4hiINdbw7+fWq3OPEnhBDRATimuShHMmYnhrgRmhQggHHOluM58kx f5uYJmw== X-Google-Smtp-Source: AGHT+IE5zlLJfJSiKDps9oa63lOpF1CpedYQdGtHutsY8b9qvB6aXOWJRFpftXMF7nK7d9tGDEfQnxjduYc= X-Received: from pfbjw38.prod.google.com ([2002:a05:6a00:92a6:b0:748:ec4d:30ec]) (user=surenb job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a20:3d1c:b0:220:e5e:5909 with SMTP id adf61e73a8af0-23813c6df02mr1420419637.20.1752635169133; Tue, 15 Jul 2025 20:06:09 -0700 (PDT) Date: Tue, 15 Jul 2025 20:05:53 -0700 In-Reply-To: <20250716030557.1547501-1-surenb@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250716030557.1547501-1-surenb@google.com> X-Mailer: git-send-email 2.50.0.727.gbf7dc18ff4-goog Message-ID: <20250716030557.1547501-5-surenb@google.com> Subject: [PATCH v7 4/7] selftests/proc: test PROCMAP_QUERY ioctl while vma is concurrently modified From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: Liam.Howlett@oracle.com, lorenzo.stoakes@oracle.com, david@redhat.com, vbabka@suse.cz, peterx@redhat.com, jannh@google.com, hannes@cmpxchg.org, mhocko@kernel.org, paulmck@kernel.org, shuah@kernel.org, adobriyan@gmail.com, brauner@kernel.org, josef@toxicpanda.com, yebin10@huawei.com, linux@weissschuh.net, willy@infradead.org, osalvador@suse.de, andrii@kernel.org, ryan.roberts@arm.com, christophe.leroy@csgroup.eu, tjmercier@google.com, kaleshsingh@google.com, aha310510@gmail.com, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, surenb@google.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Extend /proc/pid/maps tearing test to verify PROCMAP_QUERY ioctl operation correctness while the vma is being concurrently modified. Signed-off-by: Suren Baghdasaryan --- tools/testing/selftests/proc/proc-maps-race.c | 62 +++++++++++++++++++ 1 file changed, 62 insertions(+) diff --git a/tools/testing/selftests/proc/proc-maps-race.c b/tools/testing/= selftests/proc/proc-maps-race.c index 764821ffd63d..6acdafdac9db 100644 --- a/tools/testing/selftests/proc/proc-maps-race.c +++ b/tools/testing/selftests/proc/proc-maps-race.c @@ -30,6 +30,8 @@ #include #include #include +#include +#include #include #include #include @@ -239,6 +241,21 @@ static void capture_mod_pattern(int maps_fd, assert(strcmp(restored_first_line->text, first_line->text) =3D=3D 0); } =20 +static void query_addr_at(int maps_fd, void *addr, + unsigned long *vma_start, unsigned long *vma_end) +{ + struct procmap_query q; + + memset(&q, 0, sizeof(q)); + q.size =3D sizeof(q); + /* Find the VMA at the split address */ + q.query_addr =3D (unsigned long long)addr; + q.query_flags =3D 0; + assert(!ioctl(maps_fd, PROCMAP_QUERY, &q)); + *vma_start =3D q.vma_start; + *vma_end =3D q.vma_end; +} + static inline void split_vma(const struct vma_modifier_info *mod_info) { assert(mmap(mod_info->addr, page_size, mod_info->prot | PROT_EXEC, @@ -299,6 +316,8 @@ static void test_maps_tearing_from_split(int maps_fd, do { bool last_line_changed; bool first_line_changed; + unsigned long vma_start; + unsigned long vma_end; =20 read_boundary_lines(maps_fd, page1, page2, &new_last_line, &new_first_li= ne); =20 @@ -329,6 +348,19 @@ static void test_maps_tearing_from_split(int maps_fd, first_line_changed =3D strcmp(new_first_line.text, first_line->text) != =3D 0; assert(last_line_changed =3D=3D first_line_changed); =20 + /* Check if PROCMAP_QUERY ioclt() finds the right VMA */ + query_addr_at(maps_fd, mod_info->addr + page_size, + &vma_start, &vma_end); + /* + * The vma at the split address can be either the same as + * original one (if read before the split) or the same as the + * first line in the second page (if read after the split). + */ + assert((vma_start =3D=3D last_line->start_addr && + vma_end =3D=3D last_line->end_addr) || + (vma_start =3D=3D split_first_line.start_addr && + vma_end =3D=3D split_first_line.end_addr)); + clock_gettime(CLOCK_MONOTONIC_COARSE, &end_ts); } while (end_ts.tv_sec - start_ts.tv_sec < test_duration_sec); =20 @@ -390,6 +422,9 @@ static void test_maps_tearing_from_resize(int maps_fd, =20 clock_gettime(CLOCK_MONOTONIC_COARSE, &start_ts); do { + unsigned long vma_start; + unsigned long vma_end; + read_boundary_lines(maps_fd, page1, page2, &new_last_line, &new_first_li= ne); =20 /* Check if we read vmas after shrinking it */ @@ -409,6 +444,17 @@ static void test_maps_tearing_from_resize(int maps_fd, assert(!strcmp(new_last_line.text, restored_last_line.text) && !strcmp(new_first_line.text, restored_first_line.text)); } + + /* Check if PROCMAP_QUERY ioclt() finds the right VMA */ + query_addr_at(maps_fd, mod_info->addr, &vma_start, &vma_end); + /* + * The vma should stay at the same address and have either the + * original size of 3 pages or 1 page if read after shrinking. + */ + assert(vma_start =3D=3D last_line->start_addr && + (vma_end - vma_start =3D=3D page_size * 3 || + vma_end - vma_start =3D=3D page_size)); + clock_gettime(CLOCK_MONOTONIC_COARSE, &end_ts); } while (end_ts.tv_sec - start_ts.tv_sec < test_duration_sec); =20 @@ -479,6 +525,9 @@ static void test_maps_tearing_from_remap(int maps_fd, =20 clock_gettime(CLOCK_MONOTONIC_COARSE, &start_ts); do { + unsigned long vma_start; + unsigned long vma_end; + read_boundary_lines(maps_fd, page1, page2, &new_last_line, &new_first_li= ne); =20 /* Check if we read vmas after remapping it */ @@ -498,6 +547,19 @@ static void test_maps_tearing_from_remap(int maps_fd, assert(!strcmp(new_last_line.text, restored_last_line.text) && !strcmp(new_first_line.text, restored_first_line.text)); } + + /* Check if PROCMAP_QUERY ioclt() finds the right VMA */ + query_addr_at(maps_fd, mod_info->addr + page_size, &vma_start, &vma_end); + /* + * The vma should either stay at the same address and have the + * original size of 3 pages or we should find the remapped vma + * at the remap destination address with size of 1 page. + */ + assert((vma_start =3D=3D last_line->start_addr && + vma_end - vma_start =3D=3D page_size * 3) || + (vma_start =3D=3D last_line->start_addr + page_size && + vma_end - vma_start =3D=3D page_size)); + clock_gettime(CLOCK_MONOTONIC_COARSE, &end_ts); } while (end_ts.tv_sec - start_ts.tv_sec < test_duration_sec); =20 --=20 2.50.0.727.gbf7dc18ff4-goog