selftests/exec: test registering an entry disabled

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A magic entry registered with 'D' and the same entry without it, to pin
down what the flag decides and what it leaves alone:

- the entry reports itself disabled and nothing dispatches until '1' is
  written to it

- without 'D' it dispatches straight away

- 'D' is not read back among the entry's flags

- enabling and disabling afterwards works as it does for any entry

- 'D' composes with the flags that shape the invocation

- '-1' to the status file removes a staged entry like any other

- a file handle held across a removal cannot resurrect the entry

Put the entry write and read-back helpers into binfmt_misc_common.h.
The bpf suite will need them as well.

Link: https://patch.msgid.link/20260730-work-binfmt_misc-preopen-v1-3-4a0b0da71f16@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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This commit is contained in:

Christian Brauner 2026-07-30 15:34:05 +02:00

parent 686585ec27

commit 6bd0c7aba6

3 changed files with 215 additions and 0 deletions

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4

tools/testing/selftests/exec/Makefile

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39

tools/testing/selftests/exec/binfmt_misc_common.h

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172

tools/testing/selftests/exec/binfmt_misc_disabled.c

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