In the Linux kernel, the following vulnerability has been resolved:
jfs: Fix uaf in dbFreeBits
BUG: KASAN: slab-use-after-free in _mutexlockcommon kernel/locking/mutex.c:587 [inline] BUG: KASAN: slab-use-after-free in _mutex_lock+0xfe/0xd70 kernel/locking/mutex.c:752 Read of size 8 at addr ffff8880229254b0 by task syz-executor357/5216
CPU: 0 UID: 0 PID: 5216 Comm: syz-executor357 Not tainted 6.11.0-rc3-syzkaller-00156-gd7a5aa4b3c00 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Call Trace: <TASK> _dumpstack lib/dumpstack.c:93 [inline] dumpstacklvl+0x241/0x360 lib/dumpstack.c:119 printaddressdescription mm/kasan/report.c:377 [inline] printreport+0x169/0x550 mm/kasan/report.c:488 kasanreport+0x143/0x180 mm/kasan/report.c:601 _mutexlockcommon kernel/locking/mutex.c:587 [inline] _mutexlock+0xfe/0xd70 kernel/locking/mutex.c:752 dbFreeBits+0x7ea/0xd90 fs/jfs/jfsdmap.c:2390 dbFreeDmap fs/jfs/jfsdmap.c:2089 [inline] dbFree+0x35b/0x680 fs/jfs/jfsdmap.c:409 dbDiscardAG+0x8a9/0xa20 fs/jfs/jfsdmap.c:1650 jfsioctrim+0x433/0x670 fs/jfs/jfsdiscard.c:100 jfsioctl+0x2d0/0x3e0 fs/jfs/ioctl.c:131 vfsioctl fs/ioctl.c:51 [inline] _dosysioctl fs/ioctl.c:907 [inline] _sesysioctl+0xfc/0x170 fs/ioctl.c:893 dosyscallx64 arch/x86/entry/common.c:52 [inline] dosyscall64+0xf3/0x230 arch/x86/entry/common.c:83
Freed by task 5218: kasansavestack mm/kasan/common.c:47 [inline] kasansavetrack+0x3f/0x80 mm/kasan/common.c:68 kasansavefreeinfo+0x40/0x50 mm/kasan/generic.c:579 poisonslabobject+0xe0/0x150 mm/kasan/common.c:240 _kasanslabfree+0x37/0x60 mm/kasan/common.c:256 kasanslabfree include/linux/kasan.h:184 [inline] slabfreehook mm/slub.c:2252 [inline] slabfree mm/slub.c:4473 [inline] kfree+0x149/0x360 mm/slub.c:4594 dbUnmount+0x11d/0x190 fs/jfs/jfsdmap.c:278 jfsmountrw+0x4ac/0x6a0 fs/jfs/jfsmount.c:247 jfsremount+0x3d1/0x6b0 fs/jfs/super.c:454 reconfiguresuper+0x445/0x880 fs/super.c:1083 vfscmdreconfigure fs/fsopen.c:263 [inline] vfsfsconfiglocked fs/fsopen.c:292 [inline] _dosysfsconfig fs/fsopen.c:473 [inline] _sesysfsconfig+0xb6e/0xf80 fs/fsopen.c:345 dosyscallx64 arch/x86/entry/common.c:52 [inline] dosyscall64+0xf3/0x230 arch/x86/entry/common.c:83 entrySYSCALL64after_hwframe+0x77/0x7f
[Analysis] There are two paths (dbUnmount and jfsioctrim) that generate race condition when accessing bmap, which leads to the occurrence of uaf.
Use the lock s_umount to synchronize them, in order to avoid uaf caused by race condition.
[
{
"target": {
"file": "fs/jfs/jfs_discard.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@4ac58f7734937f3249da734ede946dfb3b1af5e4",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Line",
"id": "CVE-2024-49903-023b7dca",
"digest": {
"threshold": 0.9,
"line_hashes": [
"26367870524803236684551827744787543961",
"213457594201061988359941811050389240120",
"245414444659527465574612100174510099777",
"226281502417609937838503265230128979744",
"246206945370543980283463230970266267956",
"133429178884894858622802520277503926290",
"299365778829867836861859276162983338711",
"104947798033962231239997665367584522283",
"298035270931555316253932043746597349497",
"243997670621425239862093284447592912643",
"291881791679656443264125971946303904262",
"4874757269709255845032289927230748229",
"36443752780102943691540190759008373902",
"127255841614899244753130539153180963040",
"19701692821463558379018520972008673328"
]
}
},
{
"target": {
"function": "jfs_ioc_trim",
"file": "fs/jfs/jfs_discard.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@a9603a6f75df2fd8125cd208c98cfaa0fe3f7505",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"id": "CVE-2024-49903-08a1e0e5",
"digest": {
"function_hash": "16399381734613255114066337689212587080",
"length": 839.0
}
},
{
"target": {
"function": "jfs_ioc_trim",
"file": "fs/jfs/jfs_discard.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@e7ae14f7ee76c6ef5a48aebab1a278ad78f42619",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"id": "CVE-2024-49903-0a9c4dd7",
"digest": {
"function_hash": "16399381734613255114066337689212587080",
"length": 839.0
}
},
{
"target": {
"file": "fs/jfs/jfs_discard.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@3126ccde51f51b0648c8cdccaf916e8bd062e972",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Line",
"id": "CVE-2024-49903-0cd5719a",
"digest": {
"threshold": 0.9,
"line_hashes": [
"26367870524803236684551827744787543961",
"213457594201061988359941811050389240120",
"245414444659527465574612100174510099777",
"226281502417609937838503265230128979744",
"246206945370543980283463230970266267956",
"133429178884894858622802520277503926290",
"299365778829867836861859276162983338711",
"104947798033962231239997665367584522283",
"298035270931555316253932043746597349497",
"243997670621425239862093284447592912643",
"291881791679656443264125971946303904262",
"4874757269709255845032289927230748229",
"36443752780102943691540190759008373902",
"127255841614899244753130539153180963040",
"19701692821463558379018520972008673328"
]
}
},
{
"target": {
"file": "fs/jfs/jfs_discard.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@95accb7183badca387f7a8d19a2475cf3089f148",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Line",
"id": "CVE-2024-49903-2e54e7db",
"digest": {
"threshold": 0.9,
"line_hashes": [
"26367870524803236684551827744787543961",
"213457594201061988359941811050389240120",
"245414444659527465574612100174510099777",
"226281502417609937838503265230128979744",
"246206945370543980283463230970266267956",
"133429178884894858622802520277503926290",
"299365778829867836861859276162983338711",
"104947798033962231239997665367584522283",
"298035270931555316253932043746597349497",
"243997670621425239862093284447592912643",
"291881791679656443264125971946303904262",
"4874757269709255845032289927230748229",
"36443752780102943691540190759008373902",
"127255841614899244753130539153180963040",
"19701692821463558379018520972008673328"
]
}
},
{
"target": {
"function": "jfs_ioc_trim",
"file": "fs/jfs/jfs_discard.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@0c238da83f56bb895cab1e5851d034ac45b158d1",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"id": "CVE-2024-49903-4afe0b55",
"digest": {
"function_hash": "16399381734613255114066337689212587080",
"length": 839.0
}
},
{
"target": {
"function": "jfs_ioc_trim",
"file": "fs/jfs/jfs_discard.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@4ac58f7734937f3249da734ede946dfb3b1af5e4",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"id": "CVE-2024-49903-4dfe4411",
"digest": {
"function_hash": "16399381734613255114066337689212587080",
"length": 839.0
}
},
{
"target": {
"function": "jfs_ioc_trim",
"file": "fs/jfs/jfs_discard.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@4218b31ecc7af7e191768d32e32ed4386d8f9b76",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"id": "CVE-2024-49903-5a722160",
"digest": {
"function_hash": "16399381734613255114066337689212587080",
"length": 839.0
}
},
{
"target": {
"file": "fs/jfs/jfs_discard.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@e7ae14f7ee76c6ef5a48aebab1a278ad78f42619",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Line",
"id": "CVE-2024-49903-5aa7ee6d",
"digest": {
"threshold": 0.9,
"line_hashes": [
"26367870524803236684551827744787543961",
"213457594201061988359941811050389240120",
"245414444659527465574612100174510099777",
"226281502417609937838503265230128979744",
"246206945370543980283463230970266267956",
"133429178884894858622802520277503926290",
"299365778829867836861859276162983338711",
"104947798033962231239997665367584522283",
"298035270931555316253932043746597349497",
"243997670621425239862093284447592912643",
"291881791679656443264125971946303904262",
"4874757269709255845032289927230748229",
"36443752780102943691540190759008373902",
"127255841614899244753130539153180963040",
"19701692821463558379018520972008673328"
]
}
},
{
"target": {
"function": "jfs_ioc_trim",
"file": "fs/jfs/jfs_discard.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@fd026b6b6758d5569705c02540b40f3bbf822b9a",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"id": "CVE-2024-49903-5aa846d8",
"digest": {
"function_hash": "16399381734613255114066337689212587080",
"length": 839.0
}
},
{
"target": {
"file": "fs/jfs/jfs_discard.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@a9603a6f75df2fd8125cd208c98cfaa0fe3f7505",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Line",
"id": "CVE-2024-49903-697cef1c",
"digest": {
"threshold": 0.9,
"line_hashes": [
"26367870524803236684551827744787543961",
"213457594201061988359941811050389240120",
"245414444659527465574612100174510099777",
"226281502417609937838503265230128979744",
"246206945370543980283463230970266267956",
"133429178884894858622802520277503926290",
"299365778829867836861859276162983338711",
"104947798033962231239997665367584522283",
"298035270931555316253932043746597349497",
"243997670621425239862093284447592912643",
"291881791679656443264125971946303904262",
"4874757269709255845032289927230748229",
"36443752780102943691540190759008373902",
"127255841614899244753130539153180963040",
"19701692821463558379018520972008673328"
]
}
},
{
"target": {
"file": "fs/jfs/jfs_discard.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@4218b31ecc7af7e191768d32e32ed4386d8f9b76",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Line",
"id": "CVE-2024-49903-74d4b865",
"digest": {
"threshold": 0.9,
"line_hashes": [
"26367870524803236684551827744787543961",
"213457594201061988359941811050389240120",
"245414444659527465574612100174510099777",
"226281502417609937838503265230128979744",
"246206945370543980283463230970266267956",
"133429178884894858622802520277503926290",
"299365778829867836861859276162983338711",
"104947798033962231239997665367584522283",
"298035270931555316253932043746597349497",
"243997670621425239862093284447592912643",
"291881791679656443264125971946303904262",
"4874757269709255845032289927230748229",
"36443752780102943691540190759008373902",
"127255841614899244753130539153180963040",
"19701692821463558379018520972008673328"
]
}
},
{
"target": {
"file": "fs/jfs/jfs_discard.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@fd026b6b6758d5569705c02540b40f3bbf822b9a",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Line",
"id": "CVE-2024-49903-80a17730",
"digest": {
"threshold": 0.9,
"line_hashes": [
"26367870524803236684551827744787543961",
"213457594201061988359941811050389240120",
"245414444659527465574612100174510099777",
"226281502417609937838503265230128979744",
"246206945370543980283463230970266267956",
"133429178884894858622802520277503926290",
"299365778829867836861859276162983338711",
"104947798033962231239997665367584522283",
"298035270931555316253932043746597349497",
"243997670621425239862093284447592912643",
"291881791679656443264125971946303904262",
"4874757269709255845032289927230748229",
"36443752780102943691540190759008373902",
"127255841614899244753130539153180963040",
"19701692821463558379018520972008673328"
]
}
},
{
"target": {
"file": "fs/jfs/jfs_discard.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@0c238da83f56bb895cab1e5851d034ac45b158d1",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Line",
"id": "CVE-2024-49903-ad07899a",
"digest": {
"threshold": 0.9,
"line_hashes": [
"26367870524803236684551827744787543961",
"213457594201061988359941811050389240120",
"245414444659527465574612100174510099777",
"226281502417609937838503265230128979744",
"246206945370543980283463230970266267956",
"133429178884894858622802520277503926290",
"299365778829867836861859276162983338711",
"104947798033962231239997665367584522283",
"298035270931555316253932043746597349497",
"243997670621425239862093284447592912643",
"291881791679656443264125971946303904262",
"4874757269709255845032289927230748229",
"36443752780102943691540190759008373902",
"127255841614899244753130539153180963040",
"19701692821463558379018520972008673328"
]
}
},
{
"target": {
"function": "jfs_ioc_trim",
"file": "fs/jfs/jfs_discard.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@3126ccde51f51b0648c8cdccaf916e8bd062e972",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"id": "CVE-2024-49903-bbad1a5a",
"digest": {
"function_hash": "16399381734613255114066337689212587080",
"length": 839.0
}
},
{
"target": {
"function": "jfs_ioc_trim",
"file": "fs/jfs/jfs_discard.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@95accb7183badca387f7a8d19a2475cf3089f148",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"id": "CVE-2024-49903-e3c01191",
"digest": {
"function_hash": "16399381734613255114066337689212587080",
"length": 839.0
}
}
]