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Fri, 22 Sep 2023 00:12:36 -0400 (EDT) From: Ian Kent To: Al Viro , Christian Brauner Cc: autofs mailing list , linux-fsdevel , Kernel Mailing List , Bill O'Donnell , Miklos Szeredi , David Howells , Ian Kent Subject: [PATCH 2/8] autofs: add autofs_parse_fd() Date: Fri, 22 Sep 2023 12:12:09 +0800 Message-ID: <20230922041215.13675-3-raven@themaw.net> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230922041215.13675-1-raven@themaw.net> References: <20230922041215.13675-1-raven@themaw.net> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED, RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL,SPF_HELO_PASS,SPF_NONE, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (snail.vger.email [0.0.0.0]); Thu, 21 Sep 2023 21:12:55 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1777758965228507990 X-GMAIL-MSGID: 1777758965228507990 Factor out the fd mount option handling. Signed-off-by: Ian Kent --- fs/autofs/inode.c | 48 ++++++++++++++++++++++++++++++----------------- 1 file changed, 31 insertions(+), 17 deletions(-) diff --git a/fs/autofs/inode.c b/fs/autofs/inode.c index 2b49662ed237..e279e275b0a5 100644 --- a/fs/autofs/inode.c +++ b/fs/autofs/inode.c @@ -129,6 +129,33 @@ static const match_table_t tokens = { {Opt_err, NULL} }; +static int autofs_parse_fd(struct autofs_sb_info *sbi, int fd) +{ + struct file *pipe; + int ret; + + pipe = fget(fd); + if (!pipe) { + pr_err("could not open pipe file descriptor\n"); + return -EBADF; + } + + ret = autofs_check_pipe(pipe); + if (ret < 0) { + pr_err("Invalid/unusable pipe\n"); + fput(pipe); + return -EBADF; + } + + if (sbi->pipe) + fput(sbi->pipe); + + sbi->pipefd = fd; + sbi->pipe = pipe; + + return 0; +} + static int parse_options(char *options, struct inode *root, int *pgrp, bool *pgrp_set, struct autofs_sb_info *sbi) @@ -139,6 +166,7 @@ static int parse_options(char *options, int pipefd = -1; kuid_t uid; kgid_t gid; + int ret; root->i_uid = current_uid(); root->i_gid = current_gid(); @@ -162,7 +190,9 @@ static int parse_options(char *options, case Opt_fd: if (match_int(args, &pipefd)) return 1; - sbi->pipefd = pipefd; + ret = autofs_parse_fd(sbi, pipefd); + if (ret) + return 1; break; case Opt_uid: if (match_int(args, &option)) @@ -222,7 +252,6 @@ int autofs_fill_super(struct super_block *s, void *data, int silent) { struct inode *root_inode; struct dentry *root; - struct file *pipe; struct autofs_sb_info *sbi; struct autofs_info *ino; int pgrp = 0; @@ -275,7 +304,6 @@ int autofs_fill_super(struct super_block *s, void *data, int silent) ret = -ENOMEM; goto fail_ino; } - pipe = NULL; root->d_fsdata = ino; @@ -321,16 +349,7 @@ int autofs_fill_super(struct super_block *s, void *data, int silent) pr_debug("pipe fd = %d, pgrp = %u\n", sbi->pipefd, pid_nr(sbi->oz_pgrp)); - pipe = fget(sbi->pipefd); - if (!pipe) { - pr_err("could not open pipe file descriptor\n"); - goto fail_put_pid; - } - ret = autofs_prepare_pipe(pipe); - if (ret < 0) - goto fail_fput; - sbi->pipe = pipe; sbi->flags &= ~AUTOFS_SBI_CATATONIC; /* @@ -342,11 +361,6 @@ int autofs_fill_super(struct super_block *s, void *data, int silent) /* * Failure ... clean up. */ -fail_fput: - pr_err("pipe file descriptor does not contain proper ops\n"); - fput(pipe); -fail_put_pid: - put_pid(sbi->oz_pgrp); fail_dput: dput(root); goto fail_free;