CVE-2024-35979

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Source
https://nvd.nist.gov/vuln/detail/CVE-2024-35979
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-35979.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2024-35979
Related
Published
2024-05-20T10:15:12Z
Modified
2024-09-18T03:26:22.102723Z
Summary
[none]
Details

In the Linux kernel, the following vulnerability has been resolved:

raid1: fix use-after-free for original bio in raid1writerequest()

r1bio->bios[] is used to record new bios that will be issued to underlying disks, however, in raid1writerequest(), r1bio->bios[] will set to the original bio temporarily. Meanwhile, if blocked rdev is set, freer1bio() will be called causing that all r1bio->bios[] to be freed:

raid1writerequest() r1bio = allocr1bio(mddev, bio); -> r1bio->bios[] is NULL for (i = 0; i < disks; i++) -> for each rdev in conf // first rdev is normal r1bio->bios[0] = bio; -> set to original bio // second rdev is blocked if (test_bit(Blocked, &rdev->flags)) break

if (blockedrdev) freer1bio() putallbios() bioput(r1bio->bios[0]) -> original bio is freed

Test scripts:

mdadm -CR /dev/md0 -l1 -n4 /dev/sd[abcd] --assume-clean fio -filename=/dev/md0 -ioengine=libaio -rw=write -bs=4k -numjobs=1 \ -iodepth=128 -name=test -direct=1 echo blocked > /sys/block/md0/md/rd2/state

Test result:

BUG bio-264 (Not tainted): Object already free

Allocated in mempoolallocslab+0x24/0x50 age=1 cpu=1 pid=869 kmemcachealloc+0x324/0x480 mempoolallocslab+0x24/0x50 mempoolalloc+0x6e/0x220 bioallocbioset+0x1af/0x4d0 blkdevdirectIO+0x164/0x8a0 blkdevwriteiter+0x309/0x440 aiowrite+0x139/0x2f0 iosubmitone+0x5ca/0xb70 _dosysiosubmit+0x86/0x270 _x64sysiosubmit+0x22/0x30 dosyscall64+0xb1/0x210 entrySYSCALL64afterhwframe+0x6c/0x74 Freed in mempoolfreeslab+0x1f/0x30 age=1 cpu=1 pid=869 kmemcachefree+0x28c/0x550 mempoolfreeslab+0x1f/0x30 mempoolfree+0x40/0x100 biofree+0x59/0x80 bioput+0xf0/0x220 freer1bio+0x74/0xb0 raid1makerequest+0xadf/0x1150 mdhandlerequest+0xc7/0x3b0 mdsubmitbio+0x76/0x130 _submitbio+0xd8/0x1d0 submitbionoacctnocheck+0x1eb/0x5c0 submitbionoacct+0x169/0xd40 submitbio+0xee/0x1d0 blkdevdirectIO+0x322/0x8a0 blkdevwriteiter+0x309/0x440 aio_write+0x139/0x2f0

Since that bios for underlying disks are not allocated yet, fix this problem by using mempoolfree() directly to free the r1bio.

References

Affected packages

Debian:13 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.8.9-1

Affected versions

6.*

6.1.27-1
6.1.37-1
6.1.38-1
6.1.38-2~bpo11+1
6.1.38-2
6.1.38-3
6.1.38-4~bpo11+1
6.1.38-4
6.1.52-1
6.1.55-1~bpo11+1
6.1.55-1
6.1.64-1
6.1.66-1
6.1.67-1
6.1.69-1~bpo11+1
6.1.69-1
6.1.76-1~bpo11+1
6.1.76-1
6.1.82-1
6.1.85-1
6.1.90-1~bpo11+1
6.1.90-1
6.1.94-1~bpo11+1
6.1.94-1
6.1.98-1
6.1.99-1
6.1.106-1
6.1.106-2
6.1.106-3
6.3.1-1~exp1
6.3.2-1~exp1
6.3.4-1~exp1
6.3.5-1~exp1
6.3.7-1~bpo12+1
6.3.7-1
6.3.11-1
6.4~rc6-1~exp1
6.4~rc7-1~exp1
6.4.1-1~exp1
6.4.4-1~bpo12+1
6.4.4-1
6.4.4-2
6.4.4-3~bpo12+1
6.4.4-3
6.4.11-1
6.4.13-1
6.5~rc4-1~exp1
6.5~rc6-1~exp1
6.5~rc7-1~exp1
6.5.1-1~exp1
6.5.3-1~bpo12+1
6.5.3-1
6.5.6-1
6.5.8-1
6.5.10-1~bpo12+1
6.5.10-1
6.5.13-1
6.6.3-1~exp1
6.6.4-1~exp1
6.6.7-1~exp1
6.6.8-1
6.6.9-1
6.6.11-1
6.6.13-1~bpo12+1
6.6.13-1
6.6.15-1
6.6.15-2
6.7-1~exp1
6.7.1-1~exp1
6.7.4-1~exp1
6.7.7-1
6.7.9-1
6.7.9-2
6.7.12-1~bpo12+1
6.7.12-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}