kernel: remove get_task_comm() and print task comm directly

Patch series "Remove get_task_comm() and print task comm directly", v2.

Since task->comm is guaranteed to be NUL-terminated, we can print it
directly without the need to copy it into a separate buffer.  This
simplifies the code and avoids unnecessary operations.

This patch (of 5):

Since task->comm is guaranteed to be NUL-terminated, we can print it
directly without the need to copy it into a separate buffer.  This
simplifies the code and avoids unnecessary operations.

Link: https://lkml.kernel.org/r/20241219023452.69907-1-laoar.shao@gmail.com
Link: https://lkml.kernel.org/r/20241219023452.69907-2-laoar.shao@gmail.com
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Cc: Serge Hallyn <serge@hallyn.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Darren Hart <dvhart@infradead.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: "André Almeida" <andrealmeid@igalia.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Kalle Valo <kvalo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Danilo Krummrich <dakr@redhat.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Airlie <airlied@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: James Morris <jmorris@namei.org>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Jiri Slaby <jirislaby@kernel.org>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Karol Herbst <kherbst@redhat.com>
Cc: Kees Cook <kees@kernel.org>
Cc: Lyude Paul <lyude@redhat.com>
Cc: Oded Gabbay <ogabbay@kernel.org>
Cc: Paul Moore <paul@paul-moore.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Simona Vetter <simona@ffwll.ch>
Cc: Tvrtko Ursulin <tursulin@ursulin.net>
Cc: Vineet Gupta <vgupta@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/kernel/capability.c b/kernel/capability.c
index dac4df77e376ec01268528f1464c52064861f89a..e089d2628c296e1718de22fe614e2ac53ac4e2a8 100644 (file)
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -38,10 +38,8 @@ __setup("no_file_caps", file_caps_disable);
 
 static void warn_legacy_capability_use(void)
 {
-       char name[sizeof(current->comm)];
-
        pr_info_once("warning: `%s' uses 32-bit capabilities (legacy support in use)\n",
-                    get_task_comm(name, current));
+                    current->comm);
 }
 
 /*
@@ -62,10 +60,8 @@ static void warn_legacy_capability_use(void)
 
 static void warn_deprecated_v2(void)
 {
-       char name[sizeof(current->comm)];
-
        pr_info_once("warning: `%s' uses deprecated v2 capabilities in a way that may be insecure\n",
-                    get_task_comm(name, current));
+                    current->comm);
 }
 
 /*

diff --git a/kernel/futex/waitwake.c b/kernel/futex/waitwake.c
index 3a10375d952186520c3583f43caef23a3a7a3041..eb86a7ade06a201afeb67213de39ec61a1607595 100644 (file)
--- a/kernel/futex/waitwake.c
+++ b/kernel/futex/waitwake.c
@@ -210,13 +210,12 @@ static int futex_atomic_op_inuser(unsigned int encoded_op, u32 __user *uaddr)
 
        if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) {
                if (oparg < 0 || oparg > 31) {
-                       char comm[sizeof(current->comm)];
                        /*
                         * kill this print and return -EINVAL when userspace
                         * is sane again
                         */
                        pr_info_ratelimited("futex_wake_op: %s tries to shift op by %d; fix this program\n",
-                                       get_task_comm(comm, current), oparg);
+                                           current->comm, oparg);
                        oparg &= 31;
                }
                oparg = 1 << oparg;