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Thu, 12 Dec 2024 21:46:51 -0800 (PST) From: Yafang Shao To: torvalds@linux-foundation.org, akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, x86@kernel.org, linux-snps-arc@lists.infradead.org, linux-wireless@vger.kernel.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, ocfs2-devel@lists.linux.dev, Yafang Shao , Petr Mladek , Steven Rostedt , Andy Shevchenko , Rasmus Villemoes , Sergey Senozhatsky , Andy Whitcroft , Joe Perches , Dwaipayan Ray , Lukas Bulwahn Subject: [PATCH 1/7] vsprintf: Add %pTN to print task name Date: Fri, 13 Dec 2024 13:46:04 +0800 Message-Id: <20241213054610.55843-2-laoar.shao@gmail.com> X-Mailer: git-send-email 2.37.1 (Apple Git-137.1) In-Reply-To: <20241213054610.55843-1-laoar.shao@gmail.com> References: <20241213054610.55843-1-laoar.shao@gmail.com> Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Since the task->comm is guaranteed to be NUL-ternimated, we can print it directly. Add a new vsnprintf format specifier "%pTN" to print task comm, where 'p' represents the task Pointer, 'T' stands for Task, and 'N' denots Name. With this abstraction, the user no longer needs to care about retrieving task name. checkpatch.pl is updated accordingly. Link: https://lore.kernel.org/bpf/CAHk-=wgqrwFXK-CO8-V4fwUh5ymnUZ=wJnFyufV1dM9rC1t3Lg@mail.gmail.com Suggested-by: Linus Torvalds Signed-off-by: Yafang Shao Cc: Andrew Morton Cc: Petr Mladek Cc: Steven Rostedt Cc: Andy Shevchenko Cc: Rasmus Villemoes Cc: Sergey Senozhatsky Cc: Andy Whitcroft Cc: Joe Perches Cc: Dwaipayan Ray Cc: Lukas Bulwahn --- lib/vsprintf.c | 18 ++++++++++++++++++ scripts/checkpatch.pl | 6 ++++-- 2 files changed, 22 insertions(+), 2 deletions(-) diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 6ac02bbb7df1..bb1018d79655 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -2273,6 +2273,17 @@ char *resource_or_range(const char *fmt, char *buf, char *end, void *ptr, return resource_string(buf, end, ptr, spec, fmt); } +static noinline_for_stack +char *task_name_string(char *buf, char *end, struct task_struct *p, + struct printf_spec spec) +{ + if (check_pointer(&buf, end, p, spec)) + return buf; + + buf = string(buf, end, p->comm, spec); + return buf; +} + int __init no_hash_pointers_enable(char *str) { if (no_hash_pointers) @@ -2525,6 +2536,13 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr, default: return error_string(buf, end, "(einval)", spec); } + case 'T': + switch (fmt[1]) { + case 'N': + return task_name_string(buf, end, ptr, spec); + default: + return error_string(buf, end, "(einval)", spec); + } default: return default_pointer(buf, end, ptr, spec); } diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index 9eed3683ad76..fe0d80f55ce8 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -6908,11 +6908,13 @@ sub process { $specifier = $1; $extension = $2; $qualifier = $3; - if ($extension !~ /[4SsBKRraEehMmIiUDdgVCbGNOxtf]/ || + if ($extension !~ /[4SsBKRraEehMmIiUDdgVCbGNOxtfT]/ || ($extension eq "f" && defined $qualifier && $qualifier !~ /^w/) || ($extension eq "4" && - defined $qualifier && $qualifier !~ /^cc/)) { + defined $qualifier && $qualifier !~ /^cc/) || + ($extension eq "T" && + defined $qualifier && $qualifier ne "N")) { $bad_specifier = $specifier; last; } From patchwork Fri Dec 13 05:46:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Yafang Shao X-Patchwork-Id: 13906542 X-Patchwork-Delegate: johannes@sipsolutions.net Received: from mail-pl1-f179.google.com (mail-pl1-f179.google.com [209.85.214.179]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 36A1418BBBB; 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Thu, 12 Dec 2024 21:46:59 -0800 (PST) Received: from localhost.localdomain ([180.159.118.224]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-216483dd292sm82564985ad.226.2024.12.12.21.46.52 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Thu, 12 Dec 2024 21:46:58 -0800 (PST) From: Yafang Shao To: torvalds@linux-foundation.org, akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, x86@kernel.org, linux-snps-arc@lists.infradead.org, linux-wireless@vger.kernel.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, ocfs2-devel@lists.linux.dev, Yafang Shao , Serge Hallyn , Thomas Gleixner , Ingo Molnar , Peter Zijlstra , Darren Hart , Davidlohr Bueso , =?utf-8?q?Andr=C3=A9_Almeida?= Subject: [PATCH 2/7] kernel: Replace get_task_comm() with %pTN Date: Fri, 13 Dec 2024 13:46:05 +0800 Message-Id: <20241213054610.55843-3-laoar.shao@gmail.com> X-Mailer: git-send-email 2.37.1 (Apple Git-137.1) In-Reply-To: <20241213054610.55843-1-laoar.shao@gmail.com> References: <20241213054610.55843-1-laoar.shao@gmail.com> Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Since task->comm is guaranteed to be NUL-terminated, we can print it directly without the need to copye it into a separate buffer. This simplifies the code and avoids unnecessary operations. Signed-off-by: Yafang Shao Cc: Serge Hallyn Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Darren Hart Cc: Davidlohr Bueso Cc: "André Almeida" --- kernel/capability.c | 12 ++++-------- kernel/futex/waitwake.c | 5 ++--- 2 files changed, 6 insertions(+), 11 deletions(-) diff --git a/kernel/capability.c b/kernel/capability.c index dac4df77e376..4512cd797f49 100644 --- 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)); + pr_info_once("warning: `%pTN' uses 32-bit capabilities (legacy support in use)\n", + current); } /* @@ -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)); + pr_info_once("warning: `%pTN' uses deprecated v2 capabilities in a way that may be insecure\n", + current); } /* diff --git a/kernel/futex/waitwake.c b/kernel/futex/waitwake.c index 3a10375d9521..df8f8c85d776 100644 --- 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); + pr_info_ratelimited("futex_wake_op: %pTN tries to shift op by %d; fix this program\n", + current, oparg); oparg &= 31; } oparg = 1 << oparg; From patchwork Fri Dec 13 05:46:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yafang Shao X-Patchwork-Id: 13906543 X-Patchwork-Delegate: kvalo@adurom.com Received: from mail-pl1-f172.google.com (mail-pl1-f172.google.com [209.85.214.172]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D8F0D18A6BC; 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Peter Anvin" Subject: [PATCH 3/7] arch: Replace get_task_comm() with %pTN Date: Fri, 13 Dec 2024 13:46:06 +0800 Message-Id: <20241213054610.55843-4-laoar.shao@gmail.com> X-Mailer: git-send-email 2.37.1 (Apple Git-137.1) In-Reply-To: <20241213054610.55843-1-laoar.shao@gmail.com> References: <20241213054610.55843-1-laoar.shao@gmail.com> Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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. Signed-off-by: Yafang Shao Cc: Vineet Gupta Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: "H. Peter Anvin" --- arch/arc/kernel/unaligned.c | 9 ++++----- arch/x86/kernel/vm86_32.c | 5 ++--- 2 files changed, 6 insertions(+), 8 deletions(-) diff --git a/arch/arc/kernel/unaligned.c b/arch/arc/kernel/unaligned.c index d2f5ceaaed1b..fb8e995823e3 100644 --- a/arch/arc/kernel/unaligned.c +++ b/arch/arc/kernel/unaligned.c @@ -200,23 +200,22 @@ int misaligned_fixup(unsigned long address, struct pt_regs *regs, struct callee_regs *cregs) { struct disasm_state state; - char buf[TASK_COMM_LEN]; /* handle user mode only and only if enabled by sysadmin */ if (!user_mode(regs) || !unaligned_enabled) return 1; if (no_unaligned_warning) { - pr_warn_once("%s(%d) made unaligned access which was emulated" + pr_warn_once("%pTN(%d) made unaligned access which was emulated" " by kernel assist\n. This can degrade application" " performance significantly\n. To enable further" " logging of such instances, please \n" " echo 0 > /proc/sys/kernel/ignore-unaligned-usertrap\n", - get_task_comm(buf, current), task_pid_nr(current)); + current, task_pid_nr(current)); } else { /* Add rate limiting if it gets down to it */ - pr_warn("%s(%d): unaligned access to/from 0x%lx by PC: 0x%lx\n", - get_task_comm(buf, current), task_pid_nr(current), + pr_warn("%pTN(%d): unaligned access to/from 0x%lx by PC: 0x%lx\n", + current, task_pid_nr(current), address, regs->ret); } diff --git a/arch/x86/kernel/vm86_32.c b/arch/x86/kernel/vm86_32.c index e9e803a4d44c..1f55d5c2628d 100644 --- a/arch/x86/kernel/vm86_32.c +++ b/arch/x86/kernel/vm86_32.c @@ -246,9 +246,8 @@ static long do_sys_vm86(struct vm86plus_struct __user *user_vm86, bool plus) /* VM86_SCREEN_BITMAP had numerous bugs and appears to have no users. */ if (v.flags & VM86_SCREEN_BITMAP) { - char comm[TASK_COMM_LEN]; - - pr_info_once("vm86: '%s' uses VM86_SCREEN_BITMAP, which is no longer supported\n", get_task_comm(comm, current)); 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Thu, 12 Dec 2024 21:47:13 -0800 (PST) Received: from localhost.localdomain ([180.159.118.224]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-216483dd292sm82564985ad.226.2024.12.12.21.47.07 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Thu, 12 Dec 2024 21:47:13 -0800 (PST) From: Yafang Shao To: torvalds@linux-foundation.org, akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, x86@kernel.org, linux-snps-arc@lists.infradead.org, linux-wireless@vger.kernel.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, ocfs2-devel@lists.linux.dev, Yafang Shao , Johannes Berg Subject: [PATCH 4/7] net: Replace get_task_comm() with %pTN Date: Fri, 13 Dec 2024 13:46:07 +0800 Message-Id: <20241213054610.55843-5-laoar.shao@gmail.com> X-Mailer: git-send-email 2.37.1 (Apple Git-137.1) In-Reply-To: <20241213054610.55843-1-laoar.shao@gmail.com> References: <20241213054610.55843-1-laoar.shao@gmail.com> Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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. Signed-off-by: Yafang Shao Cc: Johannes Berg --- net/wireless/wext-core.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/net/wireless/wext-core.c b/net/wireless/wext-core.c index 3bb04b05c5ce..1f2a7ab546ba 100644 --- a/net/wireless/wext-core.c +++ b/net/wireless/wext-core.c @@ -640,10 +640,8 @@ EXPORT_SYMBOL(wireless_send_event); #ifdef CONFIG_CFG80211_WEXT static void wireless_warn_cfg80211_wext(void) { - char name[sizeof(current->comm)]; - - pr_warn_once("warning: `%s' uses wireless extensions which will stop working for Wi-Fi 7 hardware; use nl80211\n", - get_task_comm(name, current)); + pr_warn_once("warning: `%pTN' uses wireless extensions which will stop working for Wi-Fi 7 hardware; use nl80211\n", + current); } #endif From patchwork Fri Dec 13 05:46:08 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yafang Shao X-Patchwork-Id: 13906545 X-Patchwork-Delegate: johannes@sipsolutions.net Received: from mail-pl1-f173.google.com (mail-pl1-f173.google.com [209.85.214.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 08D9F18B492; 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Hallyn" Subject: [PATCH 5/7] security: Replace get_task_comm() with %pTN Date: Fri, 13 Dec 2024 13:46:08 +0800 Message-Id: <20241213054610.55843-6-laoar.shao@gmail.com> X-Mailer: git-send-email 2.37.1 (Apple Git-137.1) In-Reply-To: <20241213054610.55843-1-laoar.shao@gmail.com> References: <20241213054610.55843-1-laoar.shao@gmail.com> Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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. Signed-off-by: Yafang Shao Cc: Kees Cook Cc: Paul Moore Cc: James Morris Cc: "Serge E. Hallyn" Reviewed-by: Paul Moore Acked-by: Kees Cook --- security/yama/yama_lsm.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c index e1a5e13ea269..4bdfa51ea6fd 100644 --- a/security/yama/yama_lsm.c +++ b/security/yama/yama_lsm.c @@ -76,7 +76,6 @@ static void report_access(const char *access, struct task_struct *target, struct task_struct *agent) { struct access_report_info *info; - char agent_comm[sizeof(agent->comm)]; assert_spin_locked(&target->alloc_lock); /* for target->comm */ @@ -85,9 +84,8 @@ static void report_access(const char *access, struct task_struct *target, * Imagine angry ranting about procfs here. */ pr_notice_ratelimited( - "ptrace %s of \"%s\"[%d] was attempted by \"%s\"[%d]\n", - access, target->comm, target->pid, - get_task_comm(agent_comm, agent), agent->pid); + "ptrace %s of \"%pTN\"[%d] was attempted by \"%pTN\"[%d]\n", + access, target, target->pid, agent, agent->pid); return; } From patchwork Fri Dec 13 05:46:09 2024 Content-Type: text/plain; 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Thu, 12 Dec 2024 21:47:29 -0800 (PST) From: Yafang Shao To: torvalds@linux-foundation.org, akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, x86@kernel.org, linux-snps-arc@lists.infradead.org, linux-wireless@vger.kernel.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, ocfs2-devel@lists.linux.dev, Yafang Shao , Ofir Bitton , Oded Gabbay , Jani Nikula , Rodrigo Vivi , Joonas Lahtinen , Tvrtko Ursulin , David Airlie , Simona Vetter , Karol Herbst , Lyude Paul , Danilo Krummrich , Greg Kroah-Hartman , Jiri Slaby Subject: [PATCH 6/7] drivers: Repace get_task_comm() with %pTN Date: Fri, 13 Dec 2024 13:46:09 +0800 Message-Id: <20241213054610.55843-7-laoar.shao@gmail.com> X-Mailer: git-send-email 2.37.1 (Apple Git-137.1) In-Reply-To: <20241213054610.55843-1-laoar.shao@gmail.com> References: <20241213054610.55843-1-laoar.shao@gmail.com> Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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. Signed-off-by: Yafang Shao Cc: Ofir Bitton Cc: Oded Gabbay Cc: Jani Nikula Cc: Rodrigo Vivi Cc: Joonas Lahtinen Cc: Tvrtko Ursulin Cc: David Airlie Cc: Simona Vetter Cc: Karol Herbst Cc: Lyude Paul Cc: Danilo Krummrich Cc: Greg Kroah-Hartman Cc: Jiri Slaby Reviewed-by: Jiri Slaby Reviewed-by: Lyude Paul --- drivers/accel/habanalabs/common/context.c | 5 ++--- .../accel/habanalabs/common/habanalabs_ioctl.c | 15 +++++---------- .../gpu/drm/i915/display/intel_display_driver.c | 10 ++++------ drivers/gpu/drm/nouveau/nouveau_chan.c | 4 +--- drivers/gpu/drm/nouveau/nouveau_drm.c | 7 +++---- drivers/tty/tty_io.c | 5 ++--- 6 files changed, 17 insertions(+), 29 deletions(-) diff --git a/drivers/accel/habanalabs/common/context.c b/drivers/accel/habanalabs/common/context.c index b83141f58319..e4026051b735 100644 --- a/drivers/accel/habanalabs/common/context.c +++ b/drivers/accel/habanalabs/common/context.c @@ -199,7 +199,6 @@ int hl_ctx_create(struct hl_device *hdev, struct hl_fpriv *hpriv) int hl_ctx_init(struct hl_device *hdev, struct hl_ctx *ctx, bool is_kernel_ctx) { - char task_comm[TASK_COMM_LEN]; int rc = 0, i; ctx->hdev = hdev; @@ -271,8 +270,8 @@ int hl_ctx_init(struct hl_device *hdev, struct hl_ctx *ctx, bool is_kernel_ctx) mutex_init(&ctx->ts_reg_lock); - dev_dbg(hdev->dev, "create user context, comm=\"%s\", asid=%u\n", - get_task_comm(task_comm, current), ctx->asid); + dev_dbg(hdev->dev, "create user context, comm=\"%pTN\", asid=%u\n", + current, ctx->asid); } return 0; diff --git a/drivers/accel/habanalabs/common/habanalabs_ioctl.c b/drivers/accel/habanalabs/common/habanalabs_ioctl.c index 1dd6e23172ca..32678cd0775a 100644 --- a/drivers/accel/habanalabs/common/habanalabs_ioctl.c +++ b/drivers/accel/habanalabs/common/habanalabs_ioctl.c @@ -1279,13 +1279,10 @@ static long _hl_ioctl(struct hl_fpriv *hpriv, unsigned int cmd, unsigned long ar retcode = -EFAULT; out_err: - if (retcode) { - char task_comm[TASK_COMM_LEN]; - + if (retcode) dev_dbg_ratelimited(dev, - "error in ioctl: pid=%d, comm=\"%s\", cmd=%#010x, nr=%#04x\n", - task_pid_nr(current), get_task_comm(task_comm, current), cmd, nr); - } + "error in ioctl: pid=%d, comm=\"%pTN\", cmd=%#010x, nr=%#04x\n", + task_pid_nr(current), current, cmd, nr); if (kdata != stack_kdata) kfree(kdata); @@ -1308,11 +1305,9 @@ long hl_ioctl_control(struct file *filep, unsigned int cmd, unsigned long arg) if (nr == _IOC_NR(DRM_IOCTL_HL_INFO)) { ioctl = &hl_ioctls_control[nr - HL_COMMAND_START]; } else { - char task_comm[TASK_COMM_LEN]; - dev_dbg_ratelimited(hdev->dev_ctrl, - "invalid ioctl: pid=%d, comm=\"%s\", cmd=%#010x, nr=%#04x\n", - task_pid_nr(current), get_task_comm(task_comm, current), cmd, nr); + "invalid ioctl: pid=%d, comm=\"%pTN\", cmd=%#010x, nr=%#04x\n", + task_pid_nr(current), current, cmd, nr); return -ENOTTY; } diff --git a/drivers/gpu/drm/i915/display/intel_display_driver.c b/drivers/gpu/drm/i915/display/intel_display_driver.c index 56b78cf6b854..416aff49ceb8 100644 --- a/drivers/gpu/drm/i915/display/intel_display_driver.c +++ b/drivers/gpu/drm/i915/display/intel_display_driver.c @@ -391,7 +391,6 @@ void intel_display_driver_resume_access(struct drm_i915_private *i915) */ bool intel_display_driver_check_access(struct drm_i915_private *i915) { - char comm[TASK_COMM_LEN]; char current_task[TASK_COMM_LEN + 16]; char allowed_task[TASK_COMM_LEN + 16] = "none"; @@ -399,13 +398,12 @@ bool intel_display_driver_check_access(struct drm_i915_private *i915) i915->display.access.allowed_task == current) return true; - snprintf(current_task, sizeof(current_task), "%s[%d]", - get_task_comm(comm, current), - task_pid_vnr(current)); + snprintf(current_task, sizeof(current_task), "%pTN[%d]", + current, task_pid_vnr(current)); if (i915->display.access.allowed_task) - snprintf(allowed_task, sizeof(allowed_task), "%s[%d]", - get_task_comm(comm, i915->display.access.allowed_task), + snprintf(allowed_task, sizeof(allowed_task), "%pTN[%d]", + i915->display.access.allowed_task, task_pid_vnr(i915->display.access.allowed_task)); drm_dbg_kms(&i915->drm, diff --git a/drivers/gpu/drm/nouveau/nouveau_chan.c b/drivers/gpu/drm/nouveau/nouveau_chan.c index 2cb2e5675807..5bcfda6ecafe 100644 --- a/drivers/gpu/drm/nouveau/nouveau_chan.c +++ b/drivers/gpu/drm/nouveau/nouveau_chan.c @@ -279,7 +279,6 @@ nouveau_channel_ctor(struct nouveau_cli *cli, bool priv, u64 runm, const u64 plength = 0x10000; const u64 ioffset = plength; const u64 ilength = 0x02000; - char name[TASK_COMM_LEN]; int cid, ret; u64 size; @@ -338,8 +337,7 @@ nouveau_channel_ctor(struct nouveau_cli *cli, bool priv, u64 runm, chan->userd = &chan->user; } - get_task_comm(name, current); - snprintf(args.name, sizeof(args.name), "%s[%d]", name, task_pid_nr(current)); + snprintf(args.name, sizeof(args.name), "%pTN[%d]", current, task_pid_nr(current)); ret = nvif_object_ctor(&device->object, "abi16ChanUser", 0, hosts[cid].oclass, &args, sizeof(args), &chan->user); diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c index 107f63f08bd9..3264465cded6 100644 --- a/drivers/gpu/drm/nouveau/nouveau_drm.c +++ b/drivers/gpu/drm/nouveau/nouveau_drm.c @@ -1159,7 +1159,7 @@ nouveau_drm_open(struct drm_device *dev, struct drm_file *fpriv) { struct nouveau_drm *drm = nouveau_drm(dev); struct nouveau_cli *cli; - char name[32], tmpname[TASK_COMM_LEN]; + char name[32]; int ret; /* need to bring up power immediately if opening device */ @@ -1169,10 +1169,9 @@ nouveau_drm_open(struct drm_device *dev, struct drm_file *fpriv) return ret; } - get_task_comm(tmpname, current); rcu_read_lock(); - snprintf(name, sizeof(name), "%s[%d]", - tmpname, pid_nr(rcu_dereference(fpriv->pid))); + snprintf(name, sizeof(name), "%pTN[%d]", + current, pid_nr(rcu_dereference(fpriv->pid))); rcu_read_unlock(); if (!(cli = kzalloc(sizeof(*cli), GFP_KERNEL))) { diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index 9771072da177..bd39167d4234 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -2622,14 +2622,13 @@ static int tty_tiocgicount(struct tty_struct *tty, void __user *arg) static int tty_set_serial(struct tty_struct *tty, struct serial_struct *ss) { - char comm[TASK_COMM_LEN]; int flags; flags = ss->flags & ASYNC_DEPRECATED; if (flags) - pr_warn_ratelimited("%s: '%s' is using deprecated serial flags (with no effect): %.8x\n", - __func__, get_task_comm(comm, current), flags); + pr_warn_ratelimited("%s: '%pTN' is using deprecated serial flags (with no effect): %.8x\n", + __func__, current, flags); if (!tty->ops->set_serial) return -ENOTTY; 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Thu, 12 Dec 2024 21:49:26 -0800 (PST) From: Yafang Shao To: torvalds@linux-foundation.org, akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, x86@kernel.org, linux-snps-arc@lists.infradead.org, linux-wireless@vger.kernel.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, ocfs2-devel@lists.linux.dev, Yafang Shao , Mark Fasheh , Joel Becker , Joseph Qi Subject: [PATCH 7/7] fs: Use %pTN to print task name Date: Fri, 13 Dec 2024 13:49:18 +0800 Message-Id: <20241213054918.56441-1-laoar.shao@gmail.com> X-Mailer: git-send-email 2.37.1 (Apple Git-137.1) Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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. Signed-off-by: Yafang Shao Cc: Mark Fasheh Cc: Joel Becker Cc: Joseph Qi --- fs/ocfs2/cluster/netdebug.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/fs/ocfs2/cluster/netdebug.c b/fs/ocfs2/cluster/netdebug.c index bc27301eab6d..039d99f951ea 100644 --- a/fs/ocfs2/cluster/netdebug.c +++ b/fs/ocfs2/cluster/netdebug.c @@ -122,11 +122,10 @@ static int nst_seq_show(struct seq_file *seq, void *v) send = ktime_to_us(ktime_sub(now, nst->st_send_time)); status = ktime_to_us(ktime_sub(now, nst->st_status_time)); - /* get_task_comm isn't exported. oh well. */ seq_printf(seq, "%p:\n" " pid: %lu\n" " tgid: %lu\n" - " process name: %s\n" + " process name: %pTN\n" " node: %u\n" " sc: %p\n" " message id: %d\n" @@ -137,7 +136,7 @@ static int nst_seq_show(struct seq_file *seq, void *v) " wait start: %lld usecs ago\n", nst, (unsigned long)task_pid_nr(nst->st_task), (unsigned long)nst->st_task->tgid, - nst->st_task->comm, nst->st_node, + nst->st_task, nst->st_node, nst->st_sc, nst->st_id, nst->st_msg_type, nst->st_msg_key, (long long)sock,