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Tue, 01 Sep 2026 04:40:38 -0700 (PDT) Received: from localhost.localdomain ([2a12:a304:100:1e0::500e]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2d75988b6c7sm49316075ad.60.2026.09.01.04.40.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 01 Sep 2026 04:40:38 -0700 (PDT) From: Sun Jian To: kees@kernel.org, viro@zeniv.linux.org.uk, brauner@kernel.org Cc: jack@suse.cz, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, tasos.papagiannnis@gmail.com, Sun Jian Subject: [PATCH bpf-next] exec: Drop bprm loader before closing bprm->file Date: Tue, 1 Sep 2026 04:40:11 -0700 Message-ID: <20260901114011.112375-1-sun.jian.kdev@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit free_bprm() currently drops what may be the final reference to bprm->file before calling bprm_drop_loader(). Since bprm_drop_loader() is attachable via BPF fentry and bprm->file is exposed as a BTF_TYPE_SAFE_TRUSTED pointer, the file can be observed after its reference has been released. Move bprm_drop_loader() before do_close_execat(bprm->file), keeping the file reference held while the hook runs. This preserves the existing trusted BTF contract without changing verifier behavior. The loader file and bprm->file have independent references, so this reordering does not change their required teardown ordering. Link: https://sashiko.dev/#/patchset/20260831092305.42062-1-tasos.papagiannnis@gmail.com?part=3 Signed-off-by: Sun Jian --- fs/exec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/exec.c b/fs/exec.c index a14f28b15607..263b1f67f1f8 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -1469,9 +1469,9 @@ static void free_bprm(struct linux_binprm *bprm) /* exec swapped the mm but failed before setup_new_exec() freed it */ if (bprm->old_mm) exec_mm_put_old(bprm->old_mm); - do_close_execat(bprm->file); /* An unconsumed PT_INTERP substitute from a binfmt_misc loader entry. */ bprm_drop_loader(bprm); + do_close_execat(bprm->file); do_close_execat(bprm->executable); /* If a binfmt changed the interp, free it. */ if (bprm->interp != bprm->filename) base-commit: d761934c9483ecde93fe99d8705282f716dfee50 -- 2.43.0