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Wed, 17 Dec 2025 19:23:34 -0800 (PST) Received: from localhost ([2a12:a304:100::105b]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7fe12125b0fsm884992b3a.20.2025.12.17.19.23.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Dec 2025 19:23:33 -0800 (PST) From: Jinchao Wang To: Alexander Viro , Christian Brauner , Jan Kara , Kees Cook , linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Jinchao Wang , stable@vger.kernel.org, syzbot+9ca2c6e6b098bf5ae60a@syzkaller.appspotmail.com Subject: [PATCH] exec: do not call sched_mm_cid_after_execve() on exec fail Date: Thu, 18 Dec 2025 11:23:23 +0800 Message-ID: <20251218032327.199721-1-wangjinchao600@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" sched_mm_cid_after_execve() is called from the failure path of bprm_execve(). At that point exec has not completed successfully, so updating the mm CID state is incorrect and can trigger a panic, as reported by syzbot. Remove the call from the exec failure path. Cc: stable@vger.kernel.org Reported-by: syzbot+9ca2c6e6b098bf5ae60a@syzkaller.appspotmail.com Signed-off-by: Jinchao Wang --- fs/exec.c | 1 - 1 file changed, 1 deletion(-) diff --git a/fs/exec.c b/fs/exec.c index 9d5ebc9d15b0..9044a75d26ab 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -1773,7 +1773,6 @@ static int bprm_execve(struct linux_binprm *bprm) if (bprm->point_of_no_return && !fatal_signal_pending(current)) force_fatal_sig(SIGSEGV); =20 - sched_mm_cid_after_execve(current); rseq_force_update(); current->in_execve =3D 0; =20 --=20 2.43.0