binfmt_misc: add a static transparent flag 'T'

Browse source

Let a registration opt into transparent dispatch. The 'T' flag lets a
matched binary keep its argument vector and is sent to the interpreter
through AT_EXECFD. The process's identity is the binary's.

'T' implies 'O' exactly like 'C' does. 'P' is rejected in combination
with it. Transparency preserves the whole argument vector so there is
nothing left for 'P' to say. 'C' remains an independent choice and 'F'
keeps working. A pre-opened interpreter is orthogonal to how the binary
is handed over.

Like the other flag characters 'T' cannot be used as the field
delimiter. The flag scan would run off the registration buffer.

Link: https://patch.msgid.link/20260721-work-bpf-binfmt_misc-ptinterp-v2-11-e57866e4ae0f@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

...

This commit is contained in:

Christian Brauner 2026-07-21 16:13:53 +02:00

parent a4bdab2be4

commit 75e536852f

No known key found for this signature in database

GPG key ID: 91C61BC06578DCA2

2 changed files with 16 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

10

Documentation/admin-guide/binfmt-misc.rst

View file

6

fs/binfmt_misc.c

View file