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bcachefs: Fix invalid shift in validate_sb_layout()

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Add check on layout->sb_max_size_bits against BCH_SB_LAYOUT_SIZE_BITS_MAX
to prevent UBSAN shift-out-of-bounds in validate_sb_layout().

Reported-by: syzbot+089fad5a3a5e77825426@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=089fad5a3a5e77825426
Fixes: 03ef80b469 ("bcachefs: Ignore unknown mount options")
Tested-by: syzbot+089fad5a3a5e77825426@syzkaller.appspotmail.com
Signed-off-by: Gianfranco Trad <gianf.trad@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Gianfranco Trad 2024-10-23 23:30:44 +02:00 committed by Kent Overstreet
parent a069f01479
commit 2045fc4295
2 changed files with 6 additions and 0 deletions
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1
fs/bcachefs/errcode.h
View File

@ -222,6 +222,7 @@
x(BCH_ERR_invalid_sb_layout, invalid_sb_layout_type) \
x(BCH_ERR_invalid_sb_layout, invalid_sb_layout_nr_superblocks) \
x(BCH_ERR_invalid_sb_layout, invalid_sb_layout_superblocks_overlap) \
x(BCH_ERR_invalid_sb_layout, invalid_sb_layout_sb_max_size_bits) \
x(BCH_ERR_invalid_sb, invalid_sb_members_missing) \
x(BCH_ERR_invalid_sb, invalid_sb_members) \
x(BCH_ERR_invalid_sb, invalid_sb_disk_groups) \

5
fs/bcachefs/super-io.c
View File

@ -287,6 +287,11 @@ static int validate_sb_layout(struct bch_sb_layout *layout, struct printbuf *out
return -BCH_ERR_invalid_sb_layout_nr_superblocks;
}
if (layout->sb_max_size_bits > BCH_SB_LAYOUT_SIZE_BITS_MAX) {
prt_printf(out, "Invalid superblock layout: max_size_bits too high");
return -BCH_ERR_invalid_sb_layout_sb_max_size_bits;
}
max_sectors = 1 << layout->sb_max_size_bits;
prev_offset = le64_to_cpu(layout->sb_offset[0]);