linux-kernel - [PATCH v2 3/3] fs/exec: remove current->in

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Date: Sat, 3 Feb 2024 19:53:39 +0900
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To: Linus Torvalds <torvalds@...ux-foundation.org>,
        Eric Biederman <ebiederm@...ssion.com>,
        Kees Cook <keescook@...omium.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
        Paul Moore <paul@...l-moore.com>, James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>
Cc: linux-security-module <linux-security-module@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 3/3] fs/exec: remove current->in_execve flag

Addition of security_execve_abort() hook made it possible to remove
this flag.

Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
---
 fs/exec.c             | 3 ---
 include/linux/sched.h | 3 ---
 2 files changed, 6 deletions(-)

diff --git a/fs/exec.c b/fs/exec.c
index d6d35a06fd08..c197573b2940 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1865,7 +1865,6 @@ static int bprm_execve(struct linux_binprm *bprm)
 	 * where setuid-ness is evaluated.
 	 */
 	check_unsafe_exec(bprm);
-	current->in_execve = 1;
 	sched_mm_cid_before_execve(current);
 
 	sched_exec();
@@ -1882,7 +1881,6 @@ static int bprm_execve(struct linux_binprm *bprm)
 	sched_mm_cid_after_execve(current);
 	/* execve succeeded */
 	current->fs->in_exec = 0;
-	current->in_execve = 0;
 	rseq_execve(current);
 	user_events_execve(current);
 	acct_update_integrals(current);
@@ -1901,7 +1899,6 @@ static int bprm_execve(struct linux_binprm *bprm)
 
 	sched_mm_cid_after_execve(current);
 	current->fs->in_exec = 0;
-	current->in_execve = 0;
 
 	return retval;
 }
diff --git a/include/linux/sched.h b/include/linux/sched.h
index ffe8f618ab86..66ada87249b1 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -919,9 +919,6 @@ struct task_struct {
 #ifdef CONFIG_RT_MUTEXES
 	unsigned			sched_rt_mutex:1;
 #endif
-
-	/* Bit to tell TOMOYO we're in execve(): */
-	unsigned			in_execve:1;
 	unsigned			in_iowait:1;
 #ifndef TIF_RESTORE_SIGMASK
 	unsigned			restore_sigmask:1;
-- 
2.18.4