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DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: YlkZuRfKmESP8QscFXJZTLDXJi2CTYSRzgHQqtiE6WVpXjq2EzzB3zOsv/DI1mddMlBr/uqWgplcPyR0SrtFgYYYH4BtNEyMKaAFyh3/FtxrW+sCfvI5LcQPZgRu8cJlUwowEee26fzjVa9cGuTlVK2GEzrHL5hxipVzM+sHVMFp4Pp3oksLH69p5GsZ+AUQGCDW/QExGUuJCM3QgYe8DJBNGTBRhYWXTP0qZwnKUd53ZZFrjIk3OGkepy1mLmFhNv+1Tl6Bj6Ni80miOSNDzzRaj9brmrOzbtcBsKpRJAkrY2vKPyoXGfX0BjmUbgwNGyeiGPKdJB+BXdHO2I1xyQg3GAE06KUw67+QUPhgVElLgUrZocnPig0kF+LjgE5YodLQTeqhCN0qiuP3IXNTUwx9oR+Qc5D7tFwgdptH156pWEZ3cwJFNxT5JQ2vme/V X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Jul 2026 12:18:35.4656 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 112bcdc3-eea8-471c-49cd-08ded76adfe1 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d; Ip=[4.158.2.129]; Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AM1PEPF000252DB.eurprd07.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS2PR08MB10226 X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~public-inbox=simark.ca@sourceware.org I am wondering whether the fallback on maps when reading smaps is still relevant nowadays. /proc/$PID/smaps has been around since 2005. I doubt that anyone using an older Linux kernel version out there would use the latest version of GDB. I propose to remove this fallback logic in linux_find_memory_regions_full. Additionnally, reading from smaps file is tested against NULL. Why ? Is there such a valid case where the result of target_fileio_read_stralloc() could be null, and at the same time, GDB is attached to a process, local or remote via gdbserver, or while reading a coredump ? In my understanding, all those cases ensures that the smaps file is always present and so, I propose to replace this check with a gdb_assert instead. Why do I care about the above ? I would like to wrap the reading and parsing code in a class to avoid the duplication of all the boiler plates in different places. Please let me know your thoughts ? --- gdb/linux-tdep.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/gdb/linux-tdep.c b/gdb/linux-tdep.c index 6af01fc0e26..2903e853890 100644 --- a/gdb/linux-tdep.c +++ b/gdb/linux-tdep.c @@ -1667,6 +1667,7 @@ linux_process_address_in_memtag_page (CORE_ADDR address) gdb::unique_xmalloc_ptr data = target_fileio_read_stralloc (NULL, smaps_file.c_str ()); + // Why would the data be suddenly unavailable ? Should this be an assert instead ? if (data == nullptr) return false; @@ -1759,10 +1760,15 @@ linux_find_memory_regions_full (struct gdbarch *gdbarch, if (data == NULL) { - /* Older Linux kernels did not support /proc/PID/smaps. */ + /* Older Linux kernels did not support /proc/PID/smaps. + /proc//smaps was introduced in Linux 2.6.14, released on 27 + October 2005 (see proc_pid_smaps(5) — Linux manual page). + Should we really care about this very very old version ? + Does this fallback really make sense nowadays ? */ maps_filename = string_printf ("/proc/%d/maps", pid); data = target_fileio_read_stralloc (NULL, maps_filename.c_str ()); + // Should this check be an assert instead ? if (data == nullptr) return false; } @@ -3183,6 +3189,7 @@ linux_address_in_shadow_stack_mem_range gdb::unique_xmalloc_ptr data = target_fileio_read_stralloc (nullptr, smaps_file.c_str ()); + // Should this check be an assert instead ? if (data == nullptr) return false; -- 2.55.0