linux-next

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History

Jann Horn 3c0da3d163 fuse: Initialize beyond-EOF page contents before setting uptodate

fuse_notify_store(), unlike fuse_do_readpage(), does not enable page
zeroing (because it can be used to change partial page contents).

So fuse_notify_store() must be more careful to fully initialize page
contents (including parts of the page that are beyond end-of-file)
before marking the page uptodate.

The current code can leave beyond-EOF page contents uninitialized, which
makes these uninitialized page contents visible to userspace via mmap().

This is an information leak, but only affects systems which do not
enable init-on-alloc (via CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y or the
corresponding kernel command line parameter).

Link: https://bugs.chromium.org/p/project-zero/issues/detail?id=2574
Cc: stable@kernel.org
Fixes: a1d75f258230 ("fuse: add store request")
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2024-08-18 08:45:39 -07:00

acl.c

fuse: Use in_group_or_capable() helper

2024-06-25 11:15:48 +02:00

control.c

fuse: remove unneeded lock which protecting update of congestion_threshold

2024-03-06 11:07:51 +01:00

cuse.c

cuse: add kernel-doc comments to cuse_process_init_reply()

2024-04-15 11:02:10 +02:00

dax.c

fuse: dax: set fc->dax to NULL in fuse_dax_conn_free()