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AJvYcCWQGCNVsZnzj9+c5Yecb+ECw1nY+I+gG7NhosGHx/cav/QT29Q+vpQQHgwN4gH3nD/ZUqrNtUzyjQ==@kvack.org X-Gm-Message-State: AOJu0Yw2u+bT9XLRRcE4G5G05w0J5ItEvL+Kb6DlWtXKI7gEXH8Mbb8V uQoEk43TwTGNaJkeEiGve7PXvSpc96oHURMJ8ED+HQRkLE2vPHdhmDP3ZeovNkKJHyvTMgMgDYs F7q59/w== X-Google-Smtp-Source: AGHT+IGb2+UYZlfBpIllsB5zBRnjJDEHHc7eLL5E2NOd532QUxSqIns3SjUtZteR3l3V6p3oyrgM+kKIc4Y= X-Received: from pjbrs14.prod.google.com ([2002:a17:90b:2b8e:b0:312:187d:382d]) (user=surenb job=prod-delivery.src-stubby-dispatcher) by 2002:a17:903:11c3:b0:234:d7b2:2ab4 with SMTP id d9443c01a7336-23c85de4dfamr22462935ad.17.1751609258994; Thu, 03 Jul 2025 23:07:38 -0700 (PDT) Date: Thu, 3 Jul 2025 23:07:22 -0700 In-Reply-To: <20250704060727.724817-1-surenb@google.com> Mime-Version: 1.0 References: <20250704060727.724817-1-surenb@google.com> X-Mailer: git-send-email 2.50.0.727.gbf7dc18ff4-goog Message-ID: <20250704060727.724817-5-surenb@google.com> Subject: [PATCH v6 4/8] 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-Type: text/plain; charset="UTF-8" X-Stat-Signature: rb1d4ta9qw3npmr3qi5mn4x5ae188o5y X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 6FE901C0009 X-HE-Tag: 1751609260-919069 X-HE-Meta: U2FsdGVkX19Myc3L0bPx1hGnrl/yxw9JlSjW33ExTvfsD7pp2KE+M2jYbDpOtUPUbnAL4Xad/fNIgaFp5G5kZlaGB6xJKiwhJINRgWOvt6L0guGYl+bPfMNtpUq1l9884T8k4KHyy7wSraxp52hXMO0gpB1BF6a0uaSEQDC/MCINXV+0B9/A9GzrRqmOowEEPQFJqQNgFK+XiS5LiaHyAuvuw5dDyV8gackMBKewJasMRWbSz5njtC7UKt55IzDD2zR8qqvjYmmc4tQIhGzQJ9vMAY2T4AjrAIP/l1YuHfYDVRHP6W+y9zOoY/gCJ26PoXSrE9YWOcC5u8+MjMaLxV0xBhh6YwTIpoCm37JYcW/8VOR2TmTLzCmSZ7NUmy/NkxiC++SSbRsSWLAPZTSI8f/RE659E6Ymxi4a6h+Dp7CEs+il12nBHdYqjGnuxN/IvyL/k87/rwTokxFXxIyq0V1Rqtbabx1xeahHS5A8b7ISZbGpeR8cjNELqSmmMCHhLkHUtWFo5+du0IDwSACLPhIeYk0mYLvq+exLU+80mj+qI53F8JAOA9u8N99MrWFEFKIKPLhB+3mwryD9r8hOWD3Z6ATe9oir0s5Val+VXKaprI26p6u8tIFXXfVnzwCAEFxfScSe4uqffulJgscUAIN8lrjSHv8LgGnQ4sZsAcKxKRH1G7zBuCvAV6qCURAlbzOmECYWxJGFgYv6zRQR6JIzWIxiv5p5WNTSfLSinmgCHzvf+4ScoO/eH6ZsLiwnZFrImDWeY0Y/Ic8YK+n9SV1Jk2wQC64lIL1vfpd7kX4Iawoc4w2SB6MU/2BumYWYM11GmPXhZHzuZRGlU5zZQbAfFwDMF88yri+fOBIMJsVZF+s016G68clgX91U/aKhoZDJCqxJV0JASWSKhSe2yAlVVRDLL9q3KvJJVa/TwiaCxRrHXvyKks5DldtSDhZk4KHgiCZrx7z/HQa5jBI aWKyu04+ wVPwDirhDJF1Lb0bmeVPaXzlh6JScmKZCtGasA4LwKj3gnJUZMzCaHZgvpeVSY5iiuiERRTk+VzwqfpHY0V0W1uzIaw+k9c58vK5QInnSiriX0klh4XrDESo7CheCiRJ9h060ejXV+nx1PxUJYZHEWxLhN7rJbZYf/ChPJ5e0PFgLpNaBnrHDcz+36PNi6oYeTboQplukVNGezsDUCNu515ViS3SARVgMGdE1aD192E7CVj2/QyrApWQDHWEHUxS32nSHO030X/48ZiqDdKMVEA7FSmN0asILTZ/0TWEyFPdDLbp9MDe2wri5tH4BH9pYe+GJvsJ9jnxnj+VBzXd2lbpBUqy8W0C//CgFIckE9H1vC8iu98TExWpTIE5pRMkqMu0dNWZaE/xlyLf9v9/2mpYimc2EXqjxnXJVrZiJZO07BLQE2jCBFvf2wnSGteX1ZTEWvYbx7nLTwREpprjsfZtWLAmaLHSu7jakX1FJdiYd+Mru0+zvChJfPS0GuULjXXMpYw4MA7/wUtmiFV3tGVsz9gfLI5JZd/ZPSNLG2PJZLo6uFGabsO7ck4ViSowMcwlmJSifv/0I+LIENnSi6k9XUzw2FmhGDGfEdIyZkWdI6Vvy+Z2782U7ww== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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) == 0); } +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 = sizeof(q); + /* Find the VMA at the split address */ + q.query_addr = (unsigned long long)addr; + q.query_flags = 0; + assert(!ioctl(maps_fd, PROCMAP_QUERY, &q)); + *vma_start = q.vma_start; + *vma_end = 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; read_boundary_lines(maps_fd, page1, page2, &new_last_line, &new_first_line); @@ -329,6 +348,19 @@ static void test_maps_tearing_from_split(int maps_fd, first_line_changed = strcmp(new_first_line.text, first_line->text) != 0; assert(last_line_changed == first_line_changed); + /* 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 == last_line->start_addr && + vma_end == last_line->end_addr) || + (vma_start == split_first_line.start_addr && + vma_end == split_first_line.end_addr)); + clock_gettime(CLOCK_MONOTONIC_COARSE, &end_ts); } while (end_ts.tv_sec - start_ts.tv_sec < test_duration_sec); @@ -390,6 +422,9 @@ static void test_maps_tearing_from_resize(int maps_fd, 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_line); /* 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 == last_line->start_addr && + (vma_end - vma_start == page_size * 3 || + vma_end - vma_start == page_size)); + clock_gettime(CLOCK_MONOTONIC_COARSE, &end_ts); } while (end_ts.tv_sec - start_ts.tv_sec < test_duration_sec); @@ -479,6 +525,9 @@ static void test_maps_tearing_from_remap(int maps_fd, 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_line); /* 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 == last_line->start_addr && + vma_end - vma_start == page_size * 3) || + (vma_start == last_line->start_addr + page_size && + vma_end - vma_start == page_size)); + clock_gettime(CLOCK_MONOTONIC_COARSE, &end_ts); } while (end_ts.tv_sec - start_ts.tv_sec < test_duration_sec); -- 2.50.0.727.gbf7dc18ff4-goog