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linux/fs/file.c
Mateusz Guzik 08cf79c786 fs: consistently deref the files table with rcu_dereference_raw() 
[ Upstream commit f381640e1b ]

... except when the table is known to be only used by one thread.

A file pointer can get installed at any moment despite the ->file_lock
being held since the following:
8a81252b77 ("fs/file.c: don't acquire files->file_lock in fd_install()")

Accesses subject to such a race can in principle suffer load tearing.

While here redo the comment in dup_fd -- it only covered a race against
files showing up, still assuming fd_install() takes the lock.

Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Link: https://lore.kernel.org/r/20250313135725.1320914-1-mjguzik@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2025-04-25 10:43:27 +02:00

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