Changes in binfmt_misc_delim.c

550a7e28d801d35dd23aa2cdd30b7a59e193e080 - Merge tag 'vfs-7.4-rc1.binfmt' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Tue, 20 Oct 2026 05:02:56 +0200

Merge tag 'vfs-7.4-rc1.binfmt' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfsPull binfmt updates from Christian Brauner: "This only lets punctuation delimit a binfmt_misc register string. Arbitrary delimiters never made sense and nothing uses them. Every new flag shrank the set of possible delimiters and made extensions more hazardous than they need to be. Letters, digits, whitespace, control characters, bytes above 0x7f and the backslash now get EINVAL. Everything deployed uses ':' anyway. This extends the fix that rejected a flag character as the delimiter. Selftests and documentation are included"* tag 'vfs-7.4-rc1.binfmt' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: binfmt_misc: document the field delimiter selftests/exec: test delimiter restrictions binfmt_misc: only let punctuation delimit a register string List of files: /linux/tools/testing/selftests/exec/binfmt_misc_delim.c

87b76786cc04c8137133a360088d94ab2ed592ca - Merge patch series "binfmt_misc: only let punctuation delimit a register string"

Mon, 31 Aug 2026 10:06:36 +0200

Merge patch series "binfmt_misc: only let punctuation delimit a register string"Christian Brauner says:Currently we accept arbitrary delimiters which really makes no sense andfrom looking around it's an unused feature. Everytime we add a flag thenumber of possible delimiter shrinks and it makes extensions much morehazardous than they need to be. Stop it and only accept punctional asdelimiters.This extends commit 8e85d50ba111 ("binfmt_misc: reject a flag characteras the field delimiter").Letters, digits, whitespace, control characters, bytes above 0x7f andthe backslash now get -EINVAL. Everything deployed uses ':' anyway.* patches from https://patch.msgid.link/20260826-work-binfmt_misc-delim-v1-0-43618adf8599@kernel.org: binfmt_misc: document the field delimiter selftests/exec: test delimiter restrictions binfmt_misc: only let punctuation delimit a register stringLink: https://patch.msgid.link/20260826-work-binfmt_misc-delim-v1-0-43618adf8599@kernel.orgSigned-off-by: Christian Brauner (Amutable) List of files: /linux/tools/testing/selftests/exec/binfmt_misc_delim.c

6b7262392ad6b4d61d7dbf3b8dc8fbe946ac51ba - selftests/exec: test delimiter restrictions

Wed, 26 Aug 2026 17:55:47 +0200

selftests/exec: test delimiter restrictionsTest that the new delimiter restrictions work.Link: https://patch.msgid.link/20260826-work-binfmt_misc-delim-v1-2-43618adf8599@kernel.orgSigned-off-by: Christian Brauner (Amutable) List of files: /linux/tools/testing/selftests/exec/binfmt_misc_delim.c