On Saturday, July 22, 2023, Matthew Garrett <mjg59@xxxxxxxxxxxxx> wrote:
A discussion within Debian again brought up the problem that:
1) Automounting of removable media exposes the kernel to a lot of
untrusted input
2) Kernel upstream are not terribly concerned with ensuring that kernel
filesystems are resilient against deliberately malformed filesystems so
are mostly not proactively looking for bugs there
3) Uncommonly used filesystems are less likely to be tested against
adverse input in the real world and so are more likely to contain
exploitable bugs
There are various cases where people do need to make use of uncommon
filesystems, but the majority of them aren't related to removable media.
udisks2 supports setting the UDISKS_AUTO variable to 0 on devices that
shouldn't be automounted, which means something like:
SUBSYSTEM!="block", GOTO="udisks_insecure_fs_end"
ENV{ID_FS_TYPE}=="hfs", ENV{UDISKS_AUTO}="0"
# repeat as necessary for anything else that shouldn't be automounted
LABEL="udisks_insecure_fs_end"
ought to be enough. So:
a) Does this seem like a good idea?
b) If so, is dealing with it via udev rules the right approach? This way
seems desktop-agnostic
c) Where should it ship, and what should the process be for disabling it
for people who need this functionality?
Long-term I'd love to see more work put into having FUSE support for
these and leaving the in-kernel fs to stuff we know is trustworthy, but
that's rather more work.
Which file systems are considered uncommon in that context? And aren't most attacks based on file systems used by windows, which makes them "common" ? (Extfat, NTFS, VFAT)
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