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[98.38.17.99]) by smtp.googlemail.com with ESMTPSA id 586e51a60fabf-491ee1ac486sm559401fac.16.2026.09.23.15.35.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Sep 2026 15:35:14 -0700 (PDT) From: Jim Cromie Date: Wed, 23 Sep 2026 16:34:40 -0600 Subject: [PATCH v11 16/38] dyndbg: tighten fn-sig of ddebug_apply_class_bitmap Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260923-dd-cmap-part2-clean-v11-16-9b6c217fdf2f@gmail.com> References: <20260923-dd-cmap-part2-clean-v11-0-9b6c217fdf2f@gmail.com> In-Reply-To: <20260923-dd-cmap-part2-clean-v11-0-9b6c217fdf2f@gmail.com> To: Jason Baron , Shuah Khan , Andrew Morton , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Arnd Bergmann , Luis Chamberlain , Petr Pavlu , Daniel Gomez , Sami Tolvanen , Aaron Tomlin , Jonathan Corbet , Greg Kroah-Hartman , Nathan Chancellor , Nicolas Schier , Shuah Khan , Randy Dunlap , "Rafael J. Wysocki" , Pavel Machek , Len Brown , Jonathan Corbet , Petr Mladek , Steven Rostedt , John Ogness , Sergey Senozhatsky Cc: linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arch@vger.kernel.org, linux-modules@vger.kernel.org, linux-doc@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-pm@vger.kernel.org, Jim Cromie , Louis Chauvet X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1790202874; l=2921; i=jim.cromie@gmail.com; s=20260203; h=from:subject:message-id; bh=4cPDF74uOTh8cYJJIZjBbCuC9sfRIaYWwiE1nN9E9C0=; b=NdUjfPZHrk8JLNf8jv2A22Pgy2aHnQl1B+XBp+Nta+zkRjS8Vz4S7yx13vlYiDV2b3eubCIw2 aMZRGrTIoLcBlZRhOi8JWmEBIrT337ezVBtIT3C6QaKGDG6HOUEOp6P X-Developer-Key: i=jim.cromie@gmail.com; a=ed25519; pk=C6E5ODlPQo7ZBynATXH9wg7K6HxP0pIXyf4s38Qw0XE= old_bits arg is currently a pointer to the input bits, but this could allow inadvertent changes to the input by the fn. Disallow this. And constify new_bits while here. Signed-off-by: Jim Cromie Reviewed-by: Louis Chauvet --- v2: move RvB after SoB --- lib/dynamic_debug.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c index bbe32fab74e8..474df0dbedc1 100644 --- a/lib/dynamic_debug.c +++ b/lib/dynamic_debug.c @@ -620,7 +620,8 @@ static int ddebug_exec_queries(char *query, const char *modname) /* apply a new class-param setting */ static int ddebug_apply_class_bitmap(const struct ddebug_class_param *dcp, - unsigned long *new_bits, unsigned long *old_bits, + const unsigned long *new_bits, + const unsigned long old_bits, const char *query_modname) { #define QUERY_SIZE 128 @@ -629,12 +630,12 @@ static int ddebug_apply_class_bitmap(const struct ddebug_class_param *dcp, int matches = 0; int bi, ct; - if (*new_bits != *old_bits) + if (*new_bits != old_bits) v2pr_info("apply bitmap: 0x%lx to: 0x%lx for %s\n", *new_bits, - *old_bits, query_modname ?: "'*'"); + old_bits, query_modname ?: "'*'"); for (bi = 0; bi < map->length; bi++) { - if (test_bit(bi, new_bits) == test_bit(bi, old_bits)) + if (test_bit(bi, new_bits) == test_bit(bi, &old_bits)) continue; snprintf(query, QUERY_SIZE, "class %s %c%s", map->class_names[bi], @@ -646,9 +647,9 @@ static int ddebug_apply_class_bitmap(const struct ddebug_class_param *dcp, v2pr_info("bit_%d: %d matches on class: %s -> 0x%lx\n", bi, ct, map->class_names[bi], *new_bits); } - if (*new_bits != *old_bits) + if (*new_bits != old_bits) v2pr_info("applied bitmap: 0x%lx to: 0x%lx for %s\n", *new_bits, - *old_bits, query_modname ?: "'*'"); + old_bits, query_modname ?: "'*'"); return matches; } @@ -690,7 +691,7 @@ static int param_set_dyndbg_module_classes(const char *instr, } old_val = READ_ONCE(*dcp->bits); v2pr_info("bits:0x%lx > %s.%s\n", inrep, mod_name ?: "*", KP_NAME(kp)); - totct += ddebug_apply_class_bitmap(dcp, &inrep, &old_val, mod_name); + totct += ddebug_apply_class_bitmap(dcp, &inrep, old_val, mod_name); WRITE_ONCE(*dcp->bits, inrep); break; case DD_CLASS_TYPE_LEVEL_NUM: @@ -704,7 +705,7 @@ static int param_set_dyndbg_module_classes(const char *instr, old_bits = CLASSMAP_BITMASK(old_val); new_bits = CLASSMAP_BITMASK(inrep); v2pr_info("lvl:%ld bits:0x%lx > %s\n", inrep, new_bits, KP_NAME(kp)); - totct += ddebug_apply_class_bitmap(dcp, &new_bits, &old_bits, mod_name); + totct += ddebug_apply_class_bitmap(dcp, &new_bits, old_bits, mod_name); WRITE_ONCE(*dcp->lvl, inrep); break; default: -- 2.55.0