binfmt_misc: table-drive the register string flags

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Every flag character of the register string is spelled out three
times: in the parser, in the entry's /proc output and in the
delimiter blacklist that keeps a flag character from sending the flag
scan off the end of the buffer. The three lists have to agree, and
each new flag has to be added to all of them.

Describe a flag once - character, entry flag, implied flags and a
description for the registration debug output - and drive all three
from the table.

While at it, express the "a 'B' entry carries no flags" check as what
it is, an empty flags field, rather than as a fourth list of every
flag character. Equivalent: the check runs right after
check_special_flags(), which advances past exactly the flag
characters it consumed and sets exactly their flags.

No functional change.

Link: https://patch.msgid.link/20260721-work-bpf-binfmt_misc-ptinterp-v2-3-e57866e4ae0f@kernel.org
Reviewed-by: Farid Zakaria <farid.m.zakaria@gmail.com>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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Christian Brauner 2026-07-21 16:13:45 +02:00

parent ee3db4b866

commit 23c703f959

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fs/binfmt_misc.c

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