In the Linux kernel, the following vulnerability has been resolved:
ocfs2: fix races between hole punching and AIO+DIO
After commit “ocfs2: return real error code in ocfs2_dio_wr_get_block”,
fstests/generic/300 become from always failed to sometimes failed:
========================================================================
[ 473.293420 ] run fstests generic/300
In __blockdev_direct_IO, ocfs2_dio_wr_get_block is called to add unwritten
extents to a list. extents are also inserted into extent tree in
ocfs2_write_begin_nolock. Then another thread call fallocate to puch a
hole at one of the unwritten extent. The extent at cpos was removed by
ocfs2_remove_extent(). At end io worker thread, ocfs2_search_extent_list
found there is no such extent at the cpos.
T1 T2 T3
inode lock
...
insert extents
...
inode unlock
ocfs2_fallocate
__ocfs2_change_file_space
inode lock
lock ip_alloc_sem
ocfs2_remove_inode_range inode
ocfs2_remove_btree_range
ocfs2_remove_extent
^—remove the extent at cpos 78723
…
unlock ip_alloc_sem
inode unlock
ocfs2_dio_end_io
ocfs2_dio_end_io_write
lock ip_alloc_sem
ocfs2_mark_extent_written
ocfs2_change_extent_flag
ocfs2_search_extent_list
^—failed to find extent
…
unlock ip_alloc_sem
In most filesystems, fallocate is not compatible with racing with AIO+DIO,
so fix it by adding to wait for all dio before fallocate/punch_hole like
ext4.
Vendor | Product | Version | CPE |
---|---|---|---|
linux | linux_kernel | * | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/ocfs2/file.c"
],
"versions": [
{
"version": "b25801038da5",
"lessThan": "3c26b5d21b12",
"status": "affected",
"versionType": "git"
},
{
"version": "b25801038da5",
"lessThan": "e8e2db1adac4",
"status": "affected",
"versionType": "git"
},
{
"version": "b25801038da5",
"lessThan": "050ce8af6838",
"status": "affected",
"versionType": "git"
},
{
"version": "b25801038da5",
"lessThan": "38825ff9da91",
"status": "affected",
"versionType": "git"
},
{
"version": "b25801038da5",
"lessThan": "ea042dc2bea1",
"status": "affected",
"versionType": "git"
},
{
"version": "b25801038da5",
"lessThan": "3c361f313d69",
"status": "affected",
"versionType": "git"
},
{
"version": "b25801038da5",
"lessThan": "117b9c009b72",
"status": "affected",
"versionType": "git"
},
{
"version": "b25801038da5",
"lessThan": "952b023f06a2",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/ocfs2/file.c"
],
"versions": [
{
"version": "2.6.23",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.23",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.19.317",
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.4.279",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.10.221",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.15.162",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.1.95",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.6.35",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.9.6",
"lessThanOrEqual": "6.9.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.10",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]
git.kernel.org/stable/c/050ce8af6838c71e872e982b50d3f1bec21da40e
git.kernel.org/stable/c/117b9c009b72a6c2ebfd23484354dfee2d9570d2
git.kernel.org/stable/c/38825ff9da91d2854dcf6d9ac320a7e641e10f25
git.kernel.org/stable/c/3c26b5d21b1239e9c7fd31ba7d9b2d7bdbaa68d9
git.kernel.org/stable/c/3c361f313d696df72f9bccf058510e9ec737b9b1
git.kernel.org/stable/c/952b023f06a24b2ad6ba67304c4c84d45bea2f18
git.kernel.org/stable/c/e8e2db1adac47970a6a9225f3858e9aa0e86287f
git.kernel.org/stable/c/ea042dc2bea19d72e37c298bf65a9c341ef3fff3