security: Create file_truncate hook from path_truncate hook

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Like path_truncate, the file_truncate hook also restricts file
truncation, but is called in the cases where truncation is attempted
on an already-opened file.

This is required in a subsequent commit to handle ftruncate()
operations differently to truncate() operations.

Acked-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: John Johansen <john.johansen@canonical.com>
Acked-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Günther Noack <gnoack3000@gmail.com>
Link: https://lore.kernel.org/r/20221018182216.301684-2-gnoack3000@gmail.com
Signed-off-by: Mickaël Salaün <mic@digikod.net>

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Günther Noack 2022-10-18 20:22:06 +02:00 • committed by Mickaël Salaün

parent 9abf2313ad

commit 3350607dc5

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8 changed files with 42 additions and 3 deletions

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1

include/linux/lsm_hook_defs.h

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include/linux/lsm_hooks.h

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6

include/linux/security.h

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