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([2601:342:8200:6edc::b073]) by smtp.gmail.com with ESMTPSA id s23sm9020063qte.72.2019.09.30.09.07.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Sep 2019 09:07:19 -0700 (PDT) To: Alexander Viro , Hugh Dickins Cc: Linux-MM , Linux Kernel Mailing List , David Howells From: Laura Abbott Subject: mount on tmpfs failing to parse context option Message-ID: Date: Mon, 30 Sep 2019 12:07:18 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hi, Fedora got a bug report https://bugzilla.redhat.com/show_bug.cgi?id=1757104 of a failure to parse options with the context mount option. From the reporter: $ unshare -rm mount -t tmpfs tmpfs /tmp -o 'context="system_u:object_r:container_file_t:s0:c475,c690"' mount: /tmp: wrong fs type, bad option, bad superblock on tmpfs, missing codepage or helper program, or other error. Sep 30 16:50:42 kernel: tmpfs: Unknown parameter 'c690"' I haven't asked the reporter to bisect yet but I'm suspecting one of the conversion to the new mount API: $ git log --oneline v5.3..origin/master mm/shmem.c edf445ad7c8d Merge branch 'hugepage-fallbacks' (hugepatch patches from David Rientjes) 19deb7695e07 Revert "Revert "Revert "mm, thp: consolidate THP gfp handling into alloc_hugepage_direct_gfpmask"" 28eb3c808719 shmem: fix obsolete comment in shmem_getpage_gfp() 4101196b19d7 mm: page cache: store only head pages in i_pages d8c6546b1aea mm: introduce compound_nr() f32356261d44 vfs: Convert ramfs, shmem, tmpfs, devtmpfs, rootfs to use the new mount API 626c3920aeb4 shmem_parse_one(): switch to use of fs_parse() e04dc423ae2c shmem_parse_options(): take handling a single option into a helper f6490b7fbb82 shmem_parse_options(): don't bother with mpol in separate variable 0b5071dd323d shmem_parse_options(): use a separate structure to keep the results 7e30d2a5eb0b make shmem_fill_super() static I didn't find another report or a fix yet. Is it worth asking the reporter to bisect? Thanks, Laura