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| author | Jim Cromie <jim.cromie@gmail.com> | 2022-09-04 15:40:39 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-10-26 13:19:31 +0200 |
| commit | cb304d6a0ebbde895d8238685e962ac5afe14f93 (patch) | |
| tree | 3c5bbbb6a771415caf9f7f4ff5f00c36c896578d /include/linux | |
| parent | cd2fd5fb02176914e80f7db0b57e433473c2deeb (diff) | |
| download | linux-stable-cb304d6a0ebbde895d8238685e962ac5afe14f93.tar.gz linux-stable-cb304d6a0ebbde895d8238685e962ac5afe14f93.tar.bz2 linux-stable-cb304d6a0ebbde895d8238685e962ac5afe14f93.zip | |
dyndbg: fix module.dyndbg handling
[ Upstream commit 85d6b66d31c35158364058ee98fb69ab5bb6a6b1 ]
For CONFIG_DYNAMIC_DEBUG=N, the ddebug_dyndbg_module_param_cb()
stub-fn is too permissive:
bash-5.1# modprobe drm JUNKdyndbg
bash-5.1# modprobe drm dyndbgJUNK
[ 42.933220] dyndbg param is supported only in CONFIG_DYNAMIC_DEBUG builds
[ 42.937484] ACPI: bus type drm_connector registered
This caused no ill effects, because unknown parameters are either
ignored by default with an "unknown parameter" warning, or ignored
because dyndbg allows its no-effect use on non-dyndbg builds.
But since the code has an explicit feedback message, it should be
issued accurately. Fix with strcmp for exact param-name match.
Fixes: b48420c1d301 dynamic_debug: make dynamic-debug work for module initialization
Reported-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Acked-by: Jason Baron <jbaron@akamai.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Link: https://lore.kernel.org/r/20220904214134.408619-3-jim.cromie@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/dynamic_debug.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h index b3419da1a776..77a16b2eb42f 100644 --- a/include/linux/dynamic_debug.h +++ b/include/linux/dynamic_debug.h @@ -168,7 +168,7 @@ static inline int ddebug_remove_module(const char *mod) static inline int ddebug_dyndbg_module_param_cb(char *param, char *val, const char *modname) { - if (strstr(param, "dyndbg")) { + if (!strcmp(param, "dyndbg")) { /* avoid pr_warn(), which wants pr_fmt() fully defined */ printk(KERN_WARNING "dyndbg param is supported only in " "CONFIG_DYNAMIC_DEBUG builds\n"); |