In the Linux kernel, the following vulnerability has been resolved:
nfsd: fix possible badness in FREESTATEID
When multiple FREESTATEIDs are sent for the same delegation stateid, it can lead to a possible either use-after-free or counter refcount underflow errors.
In nfsd4freestateid() under the client lock we find a delegation stateid, however the code drops the lock before calling nfs4putstid(), that allows another FREESTATE to find the stateid again. The first one will proceed to then free the stateid which leads to either use-after-free or decrementing already zeroed counter.
In the Linux kernel, the following vulnerability has been resolved:
NFSv4: Prevent NULL-pointer dereference in nfs42completecopies()
On the node of an NFS client, some files saved in the mountpoint of the NFS server were copied to another location of the same NFS server. Accidentally, the nfs42completecopies() got a NULL-pointer dereference crash with the following syslog:
[232064.838881] NFSv4: state recovery failed for open file nfs/pvc-12b5200d-cd0f-46a3-b9f0-af8f4fe0ef64.qcow2, error = -116 [232064.839360] NFSv4: state recovery failed for open file nfs/pvc-12b5200d-cd0f-46a3-b9f0-af8f4fe0ef64.qcow2, error = -116 [232066.588183] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000058 [232066.588586] Mem abort info: [232066.588701] ESR = 0x0000000096000007 [232066.588862] EC = 0x25: DABT (current EL), IL = 32 bits [232066.589084] SET = 0, FnV = 0 [232066.589216] EA = 0, S1PTW = 0 [232066.589340] FSC = 0x07: level 3 translation fault [232066.589559] Data abort info: [232066.589683] ISV = 0, ISS = 0x00000007 [232066.589842] CM = 0, WnR = 0 [232066.589967] user pgtable: 64k pages, 48-bit VAs, pgdp=00002000956ff400 [232066.590231] [0000000000000058] pgd=08001100ae100003, p4d=08001100ae100003, pud=08001100ae100003, pmd=08001100b3c00003, pte=0000000000000000 [232066.590757] Internal error: Oops: 96000007 [#1] SMP [232066.590958] Modules linked in: rpcsecgsskrb5 authrpcgss nfsv4 dnsresolver nfs lockd grace fscache netfs ocfs2dlmfs ocfs2stacko2cb ocfs2dlm vhostnet vhost vhostiotlb tap tun iptrpfilter xtmultiport ipsethaship ipsethashnet xfrminterface xfrm6tunnel tunnel4 tunnel6 esp4 ah4 wireguard libcurve25519generic veth xtaddrtype xtset nfconntracknetlink ipsethashipportnet ipsethashipportip ipsetbitmapport ipsethashipport dummy ipset ipvssh ipvswrr ipvsrr ipvs iptablefilter schingress nfnetlinkcttimeout vportgre ipgre iptunnel gre vportgeneve geneve vportvxlan vxlan ip6udptunnel udptunnel openvswitch nfconncount dmroundrobin dmservicetime dmmultipath xtnat xtMASQUERADE nftchainnat nfnat xtmark xtconntrack xtcomment nftcompat nftcounter nftables nfnetlink ocfs2 ocfs2nodemanager ocfs2stackglue iscsitcp libiscsitcp libiscsi scsitransportiscsi ipmissif nbd overlay 8021q garp mrp bonding tls rfkill sunrpc ext4 mbcache jbd2 [232066.591052] vfat fat cascache casdisk ses enclosure scsitransportsas sg acpiipmi ipmisi ipmidevintf ipmimsghandler iptables vfiopci vfiopcicore vfiovirqfd vfioiommutype1 vfio dmmirror dmregionhash dmlog dmmod nfconntrack nfdefragipv6 nfdefragipv4 brnetfilter bridge stp llc fuse xfs libcrc32c ast drmvramhelper qla2xxx drmkmshelper syscopyarea crct10difce sysfillrect ghashce sysimgblt sha2ce fbsysfops cec sha256arm64 sha1ce drmttmhelper ttm nvmefc igb sbsagwdt nvmefabrics drm nvmecore i2calgobit i40e scsitransportfc megaraidsas aesneonbs [232066.596953] CPU: 6 PID: 4124696 Comm: 10.253.166.125- Kdump: loaded Not tainted 5.15.131-9.cl9ocfs2.aarch64 #1 [232066.597356] Hardware name: Great Wall .\x93\x8e...RF6260 V5/GWMSSE2GL1T, BIOS T656FBEV3.0.18 2024-01-06 [232066.597721] pstate: 20400009 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [232066.598034] pc : nfs4reclaimopenstate+0x220/0x800 [nfsv4] [232066.598327] lr : nfs4reclaimopenstate+0x12c/0x800 [nfsv4] [232066.598595] sp : ffff8000f568fc70 [232066.598731] x29: ffff8000f568fc70 x28: 0000000000001000 x27: ffff21003db33000 [232066.599030] x26: ffff800005521ae0 x25: ffff0100f98fa3f0 x24: 0000000000000001 [232066.599319] x23: ffff800009920008 x22: ffff21003db33040 x21: ffff21003db33050 [232066.599628] x20: ffff410172fe9e40 x19: ffff410172fe9e00 x18: 0000000000000000 [232066.599914] x17: 0000000000000000 x16: 0000000000000004 x15: 0000000000000000 [232066.600195] x14: 0000000000000000 x13: ffff800008e685a8 x12: 00000000eac0c6e6 [232066.600498] x11: 00000000000000 ---truncated---
In the Linux kernel, the following vulnerability has been resolved:
mptcp: pm: fix UaF read in mptcppmnlrmaddrorsubflow
Syzkaller reported this splat:
================================================================== BUG: KASAN: slab-use-after-free in mptcppmnlrmaddrorsubflow+0xb44/0xcc0 net/mptcp/pmnetlink.c:881 Read of size 4 at addr ffff8880569ac858 by task syz.1.2799/14662
CPU: 0 UID: 0 PID: 14662 Comm: syz.1.2799 Not tainted 6.12.0-rc2-syzkaller-00307-g36c254515dc6 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: <TASK> dumpstack lib/dumpstack.c:94 [inline] dumpstacklvl+0x116/0x1f0 lib/dumpstack.c:120 printaddressdescription mm/kasan/report.c:377 [inline] printreport+0xc3/0x620 mm/kasan/report.c:488 kasanreport+0xd9/0x110 mm/kasan/report.c:601 mptcppmnlrmaddrorsubflow+0xb44/0xcc0 net/mptcp/pmnetlink.c:881 mptcppmnlrmsubflowreceived net/mptcp/pmnetlink.c:914 [inline] mptcpnlremoveidzeroaddress+0x305/0x4a0 net/mptcp/pmnetlink.c:1572 mptcppmnldeladdrdoit+0x5c9/0x770 net/mptcp/pmnetlink.c:1603 genlfamilyrcvmsgdoit+0x202/0x2f0 net/netlink/genetlink.c:1115 genlfamilyrcvmsg net/netlink/genetlink.c:1195 [inline] genlrcvmsg+0x565/0x800 net/netlink/genetlink.c:1210 netlinkrcvskb+0x165/0x410 net/netlink/afnetlink.c:2551 genlrcv+0x28/0x40 net/netlink/genetlink.c:1219 netlinkunicastkernel net/netlink/afnetlink.c:1331 [inline] netlinkunicast+0x53c/0x7f0 net/netlink/afnetlink.c:1357 netlinksendmsg+0x8b8/0xd70 net/netlink/afnetlink.c:1901 socksendmsgnosec net/socket.c:729 [inline] socksendmsg net/socket.c:744 [inline] syssendmsg+0x9ae/0xb40 net/socket.c:2607 syssendmsg+0x135/0x1e0 net/socket.c:2661 syssendmsg+0x117/0x1f0 net/socket.c:2690 dosyscall32irqson arch/x86/entry/common.c:165 [inline] dofastsyscall32+0x73/0x120 arch/x86/entry/common.c:386 dofastsyscall32+0x32/0x80 arch/x86/entry/common.c:411 entrySYSENTERcompatafterhwframe+0x84/0x8e RIP: 0023:0xf7fe4579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f574556c EFLAGS: 00000296 ORIGRAX: 0000000000000172 RAX: ffffffffffffffda RBX: 000000000000000b RCX: 0000000020000140 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK>
Allocated by task 5387: kasansavestack+0x33/0x60 mm/kasan/common.c:47 kasansavetrack+0x14/0x30 mm/kasan/common.c:68 poisonkmallocredzone mm/kasan/common.c:377 [inline] kasankmalloc+0xaa/0xb0 mm/kasan/common.c:394 kmallocnoprof include/linux/slab.h:878 [inline] kzallocnoprof include/linux/slab.h:1014 [inline] subflowcreatectx+0x87/0x2a0 net/mptcp/subflow.c:1803 subflowulpinit+0xc3/0x4d0 net/mptcp/subflow.c:1956 tcpsetulp net/ipv4/tcpulp.c:146 [inline] tcpsetulp+0x326/0x7f0 net/ipv4/tcpulp.c:167 mptcpsubflowcreatesocket+0x4ae/0x10a0 net/mptcp/subflow.c:1764 mptcpsubflowconnect+0x3cc/0x1490 net/mptcp/subflow.c:1592 mptcppmcreatesubfloworsignaladdr+0xbda/0x23a0 net/mptcp/pmnetlink.c:642 mptcppmnlfullyestablished net/mptcp/pmnetlink.c:650 [inline] mptcppmnlwork+0x3a1/0x4f0 net/mptcp/pmnetlink.c:943 mptcpworker+0x15a/0x1240 net/mptcp/protocol.c:2777 processonework+0x958/0x1b30 kernel/workqueue.c:3229 processscheduledworks kernel/workqueue.c:3310 [inline] workerthread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 retfromfork+0x45/0x80 arch/x86/ke ---truncated---
In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix possible double free in smb2setea()
Clang static checker(scan-build) warning： fs/smb/client/smb2ops.c:1304:2: Attempt to free released memory. 1304 | kfree(ea); | ^~~~~~~~~
There is a double free in such case: 'ea is initialized to NULL' -> 'first successful memory allocation for ea' -> 'something failed, goto seaexit' -> 'first memory release for ea' -> 'goto replayagain' -> 'second goto seaexit before allocate memory for ea' -> 'second memory release for ea resulted in double free'.
Re-initialie 'ea' to NULL near to the replayagain label, it can fix this double free problem.
In the Linux kernel, the following vulnerability has been resolved:
tcp/dccp: Don't use timerpending() in reqskqueueunlink().
Martin KaFai Lau reported use-after-free [0] in reqsktimerhandler().
""" We are seeing a use-after-free from a bpf prog attached to tracetcpretransmitsynack. The program passes the req->sk to the bpfskstoragegettracing kernel helper which does check for null before using it. """
The commit 83fccfc3940c ("inet: fix potential deadlock in reqskqueueunlink()") added timerpending() in reqskqueueunlink() not to call deltimersync() from reqsktimerhandler(), but it introduced a small race window.
Before the timer is called, expiretimers() calls detachtimer(timer, true) to clear timer->entry.pprev and marks it as not pending.
If reqskqueueunlink() checks timerpending() just after expiretimers() calls detachtimer(), TCP will miss deltimersync(); the reqsk timer will continue running and send multiple SYN+ACKs until it expires.
The reported UAF could happen if req->sk is close()d earlier than the timer expiration, which is 63s by default.
The scenario would be
1. inetcskcompletehashdance() calls inetcskreqskqueuedrop(), but deltimersync() is missed
2. reqsk timer is executed and scheduled again
3. req->sk is accept()ed and reqskput() decrements rskrefcnt, but reqsk timer still has another one, and inetcskaccept() does not clear req->sk for non-TFO sockets
4. sk is close()d
5. reqsk timer is executed again, and BPF touches req->sk
Let's not use timerpending() by passing the caller context to inetcskreqskqueuedrop().
Note that reqsk timer is pinned, so the issue does not happen in most use cases. [1]
[0] BUG: KFENCE: use-after-free read in bpfskstoragegettracing+0x2e/0x1b0
Use-after-free read at 0x00000000a891fb3a (in kfence-#1): bpfskstoragegettracing+0x2e/0x1b0 bpfprog5ea3e95db6da0438tcpretransmitsynack+0x1d20/0x1dda bpftracerun2+0x4c/0xc0 tcprtxsynack+0xf9/0x100 reqsktimerhandler+0xda/0x3d0 runtimersoftirq+0x292/0x8a0 irqexitrcu+0xf5/0x320 sysvecapictimerinterrupt+0x6d/0x80 asmsysvecapictimerinterrupt+0x16/0x20 intelidleirq+0x5a/0xa0 cpuidleenterstate+0x94/0x273 cpustartupentry+0x15e/0x260 startsecondary+0x8a/0x90 secondarystartup64noverify+0xfa/0xfb
kfence-#1: 0x00000000a72cc7b6-0x00000000d97616d9, size=2376, cache=TCPv6
allocated by task 0 on cpu 9 at 260507.901592s: skprotalloc+0x35/0x140 skclonelock+0x1f/0x3f0 inetcskclonelock+0x15/0x160 tcpcreateopenreqchild+0x1f/0x410 tcpv6synrecvsock+0x1da/0x700 tcpcheckreq+0x1fb/0x510 tcpv6rcv+0x98b/0x1420 ipv6listrcv+0x2258/0x26e0 napicompletedone+0x5b1/0x2990 mlx5enapipoll+0x2ae/0x8d0 netrxaction+0x13e/0x590 irqexitrcu+0xf5/0x320 commoninterrupt+0x80/0x90 asmcommoninterrupt+0x22/0x40 cpuidleenterstate+0xfb/0x273 cpustartupentry+0x15e/0x260 startsecondary+0x8a/0x90 secondarystartup64noverify+0xfa/0xfb
freed by task 0 on cpu 9 at 260507.927527s: rcucoresi+0x4ff/0xf10 irqexitrcu+0xf5/0x320 sysvecapictimerinterrupt+0x6d/0x80 asmsysvecapictimerinterrupt+0x16/0x20 cpuidleenterstate+0xfb/0x273 cpustartupentry+0x15e/0x260 startsecondary+0x8a/0x90 secondarystartup64noverify+0xfa/0xfb
In the Linux kernel, the following vulnerability has been resolved:
net: ethernet: mtkethsoc: fix memory corruption during fq dma init
The loop responsible for allocating up to MTKFQDMALENGTH buffers must only touch as many descriptors, otherwise it ends up corrupting unrelated memory. Fix the loop iteration count accordingly.
In the Linux kernel, the following vulnerability has been resolved:
net: vertexcom: mse102x: Fix possible double free of TX skb
The scope of the TX skb is wider than just mse102xtxframespi(), so in case the TX skb room needs to be expanded, we should free the the temporary skb instead of the original skb. Otherwise the original TX skb pointer would be freed again in mse102xtxwork(), which leads to crashes:
Internal error: Oops: 0000000096000004 [#2] PREEMPT SMP CPU: 0 PID: 712 Comm: kworker/0:1 Tainted: G D 6.6.23 Hardware name: chargebyte Charge SOM DC-ONE (DT) Workqueue: events mse102xtxwork [mse102x] pstate: 20400009 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : skbreleasedata+0xb8/0x1d8 lr : skbreleasedata+0x1ac/0x1d8 sp : ffff8000819a3cc0 x29: ffff8000819a3cc0 x28: ffff0000046daa60 x27: ffff0000057f2dc0 x26: ffff000005386c00 x25: 0000000000000002 x24: 00000000ffffffff x23: 0000000000000000 x22: 0000000000000001 x21: ffff0000057f2e50 x20: 0000000000000006 x19: 0000000000000000 x18: ffff00003fdacfcc x17: e69ad452d0c49def x16: 84a005feff870102 x15: 0000000000000000 x14: 000000000000024a x13: 0000000000000002 x12: 0000000000000000 x11: 0000000000000400 x10: 0000000000000930 x9 : ffff00003fd913e8 x8 : fffffc00001bc008 x7 : 0000000000000000 x6 : 0000000000000008 x5 : ffff00003fd91340 x4 : 0000000000000000 x3 : 0000000000000009 x2 : 00000000fffffffe x1 : 0000000000000000 x0 : 0000000000000000 Call trace: skbreleasedata+0xb8/0x1d8 kfreeskbreason+0x48/0xb0 mse102xtxwork+0x164/0x35c [mse102x] processonework+0x138/0x260 workerthread+0x32c/0x438 kthread+0x118/0x11c retfromfork+0x10/0x20 Code: aa1303e0 97fffab6 72001c1f 54000141 (f9400660)
In the Linux kernel, the following vulnerability has been resolved:
RDMA/siw: Add sendpageok() check to disable MSGSPLICEPAGES
While running ISER over SIW, the initiator machine encounters a warning from skbsplicefromiter() indicating that a slab page is being used in sendpage. To address this, it is better to add a sendpageok() check within the driver itself, and if it returns 0, then MSGSPLICEPAGES flag should be disabled before entering the network stack.
A similar issue has been discussed for NVMe in this thread: https://lore.kernel.org/all/20240530142417.146696-1-ofir.gal@volumez.com/
WARNING: CPU: 0 PID: 5342 at net/core/skbuff.c:7140 skbsplicefromiter+0x173/0x320 Call Trace: tcpsendmsglocked+0x368/0xe40 siwtxhdt+0x695/0xa40 [siw] siwqpsqprocess+0x102/0xb00 [siw] siwsqresume+0x39/0x110 [siw] siwrunsq+0x74/0x160 [siw] kthread+0xd2/0x100 retfromfork+0x34/0x40 retfromforkasm+0x1a/0x30
In the Linux kernel, the following vulnerability has been resolved:
smb: client: Fix use-after-free of network namespace.
Recently, we got a customer report that CIFS triggers oops while reconnecting to a server. [0]
The workload runs on Kubernetes, and some pods mount CIFS servers in non-root network namespaces. The problem rarely happened, but it was always while the pod was dying.
The root cause is wrong reference counting for network namespace.
CIFS uses kernel sockets, which do not hold refcnt of the netns that the socket belongs to. That means CIFS must ensure the socket is always freed before its netns; otherwise, use-after-free happens.
The repro steps are roughly:
1. mount CIFS in a non-root netns 2. drop packets from the netns 3. destroy the netns 4. unmount CIFS
We can reproduce the issue quickly with the script [1] below and see the splat [2] if CONFIGNETNSREFCNTTRACKER is enabled.
When the socket is TCP, it is hard to guarantee the netns lifetime without holding refcnt due to async timers.
Let's hold netns refcnt for each socket as done for SMC in commit 9744d2bf1976 ("smc: Fix use-after-free in tcpwritetimerhandler().").
Note that we need to move putnet() from cifsputtcpsession() to cleandemultiplexinfo(); otherwise, sockcreate() still could touch a freed netns while cifsd tries to reconnect from cifsdemultiplexthread().
Also, maybegetnet() cannot be put just before sockcreate() because the code is not under RCU and there is a small chance that the same address happened to be reallocated to another netns.
[0]: CIFS: VFS: \\XXXXXXXXXXX has not responded in 15 seconds. Reconnecting... CIFS: Serverclose failed 4 times, giving up Unable to handle kernel paging request at virtual address 14de99e461f84a07 Mem abort info: ESR = 0x0000000096000004 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000004 CM = 0, WnR = 0 [14de99e461f84a07] address between user and kernel address ranges Internal error: Oops: 0000000096000004 [#1] SMP Modules linked in: clsbpf schingress nlsutf8 cifs cifsarc4 cifsmd4 dnsresolver tcpdiag inetdiag veth xtstate xtconnmark nfconntracknetlink xtnat xtstatistic xtMASQUERADE xtmark xtaddrtype iptREJECT nfrejectipv4 nftchainnat nfnat xtconntrack nfconntrack nfdefragipv6 nfdefragipv4 xtcomment nftcompat nftables nfnetlink overlay nlsascii nlscp437 sunrpc vfat fat aesceblk aescecipher ghashce sm4cecipher sm4 sm3ce sm3 sha3ce sha512ce sha512arm64 sha1ce ena button schfqcodel loop fuse configfs dmisysfs sha2ce sha256arm64 dmmirror dmregionhash dmlog dmmod dax efivarfs CPU: 5 PID: 2690970 Comm: cifsd Not tainted 6.1.103-109.184.amzn2023.aarch64 #1 Hardware name: Amazon EC2 r7g.4xlarge/, BIOS 1.0 11/1/2018 pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : fibruleslookup+0x44/0x238 lr : fiblookup+0x64/0xbc sp : ffff8000265db790 x29: ffff8000265db790 x28: 0000000000000000 x27: 000000000000bd01 x26: 0000000000000000 x25: ffff000b4baf8000 x24: ffff00047b5e4580 x23: ffff8000265db7e0 x22: 0000000000000000 x21: ffff00047b5e4500 x20: ffff0010e3f694f8 x19: 14de99e461f849f7 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000000 x12: 3f92800abd010002 x11: 0000000000000001 x10: ffff0010e3f69420 x9 : ffff800008a6f294 x8 : 0000000000000000 x7 : 0000000000000006 x6 : 0000000000000000 x5 : 0000000000000001 x4 : ffff001924354280 x3 : ffff8000265db7e0 x2 : 0000000000000000 x1 : ffff0010e3f694f8 x0 : ffff00047b5e4500 Call trace: fibruleslookup+0x44/0x238 fiblookup+0x64/0xbc iprouteoutputkeyhashrcu+0x2c4/0x398 iprouteoutputkeyhash+0x60/0x8c tcpv4connect+0x290/0x488 inetstreamconnect+0x108/0x3d0 inetstreamconnect+0x50/0x78 kernelconnect+0x6c/0xac genericipconne ---truncated---
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: fix slab-use-after-free in ksmbdsmb2sessioncreate
There is a race condition between ksmbdsmb2sessioncreate and ksmbdexpiresession. This patch add missing sessionstablelock while adding/deleting session from global session table.
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: fix slab-use-after-free in smb3preauthhashrsp
ksmbdusersessionput should be called under smb3preauthhashrsp(). It will avoid freeing session before calling smb3preauthhashrsp().
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: hciconn: Fix UAF in hcienhancedsetupsync
This checks if the ACL connection remains valid as it could be destroyed while hcienhancedsetupsync is pending on cmdsync leading to the following trace:
BUG: KASAN: slab-use-after-free in hcienhancedsetupsync+0x91b/0xa60 Read of size 1 at addr ffff888002328ffd by task kworker/u5:2/37
CPU: 0 UID: 0 PID: 37 Comm: kworker/u5:2 Not tainted 6.11.0-rc6-01300-g810be445d8d6 #7099 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-2.fc40 04/01/2014 Workqueue: hci0 hcicmdsyncwork Call Trace: <TASK> dumpstacklvl+0x5d/0x80 ? hcienhancedsetupsync+0x91b/0xa60 printreport+0x152/0x4c0 ? hcienhancedsetupsync+0x91b/0xa60 ? virtaddrvalid+0x1fa/0x420 ? hcienhancedsetupsync+0x91b/0xa60 kasanreport+0xda/0x1b0 ? hcienhancedsetupsync+0x91b/0xa60 hcienhancedsetupsync+0x91b/0xa60 ? pfxhcienhancedsetupsync+0x10/0x10 ? pfxmutexlock+0x10/0x10 hcicmdsyncwork+0x1c2/0x330 processonework+0x7d9/0x1360 ? pfxlockacquire+0x10/0x10 ? pfxprocessonework+0x10/0x10 ? assignwork+0x167/0x240 workerthread+0x5b7/0xf60 ? kthreadparkme+0xac/0x1c0 ? pfxworkerthread+0x10/0x10 ? pfxworkerthread+0x10/0x10 kthread+0x293/0x360 ? pfxkthread+0x10/0x10 retfromfork+0x2f/0x70 ? pfxkthread+0x10/0x10 retfromforkasm+0x1a/0x30 </TASK>
Allocated by task 34: kasansavestack+0x30/0x50 kasansavetrack+0x14/0x30 kasankmalloc+0x8f/0xa0 hciconnadd+0x187/0x17d0 hciconnectsco+0x2e1/0xb90 scosockconnect+0x2a2/0xb80 sysconnect+0x227/0x2a0 x64sysconnect+0x6d/0xb0 dosyscall64+0x71/0x140 entrySYSCALL64afterhwframe+0x76/0x7e
Freed by task 37: kasansavestack+0x30/0x50 kasansavetrack+0x14/0x30 kasansavefreeinfo+0x3b/0x60 kasanslabfree+0x101/0x160 kfree+0xd0/0x250 devicerelease+0x9a/0x210 kobjectput+0x151/0x280 hciconndel+0x448/0xbf0 hciabortconnsync+0x46f/0x980 hcicmdsyncwork+0x1c2/0x330 processonework+0x7d9/0x1360 workerthread+0x5b7/0xf60 kthread+0x293/0x360 retfromfork+0x2f/0x70 retfromforkasm+0x1a/0x30
In the Linux kernel, the following vulnerability has been resolved:
i40e: Fix macvlan leak by synchronizing access to macfilterhash
This patch addresses a macvlan leak issue in the i40e driver caused by concurrent access to vsi->macfilterhash. The leak occurs when multiple threads attempt to modify the macfilterhash simultaneously, leading to inconsistent state and potential memory leaks.
To fix this, we now wrap the calls to i40edelmacfilter() and zeroing vf->defaultlanaddr.addr with spinlock/unlockbh(&vsi->macfilterhashlock), ensuring atomic operations and preventing concurrent access.
Additionally, we add lockdepassertheld(&vsi->macfilterhashlock) in i40eaddmacfilter() to help catch similar issues in the future.
Reproduction steps: 1. Spawn VFs and configure port vlan on them. 2. Trigger concurrent macvlan operations (e.g., adding and deleting portvlan and/or mac filters). 3. Observe the potential memory leak and inconsistent state in the macfilterhash.
This synchronization ensures the integrity of the macfilterhash and prevents the described leak.
In the Linux kernel, the following vulnerability has been resolved:
firewire: core: fix invalid port index for parent device
In a commit 24b7f8e5cd65 ("firewire: core: use helper functions for self ID sequence"), the enumeration over self ID sequence was refactored with some helper functions with KUnit tests. These helper functions are guaranteed to work expectedly by the KUnit tests, however their application includes a mistake to assign invalid value to the index of port connected to parent device.
This bug affects the case that any extra node devices which has three or more ports are connected to 1394 OHCI controller. In the case, the path to update the tree cache could hits WARNON(), and gets general protection fault due to the access to invalid address computed by the invalid value.
This commit fixes the bug to assign correct port index.
In the Linux kernel, the following vulnerability has been resolved:
aoe: fix the potential use-after-free problem in more places
For fixing CVE-2023-6270, f98364e92662 ("aoe: fix the potential use-after-free problem in aoecmdcfgpkts") makes tx() calling devput() instead of doing in aoecmdcfgpkts(). It avoids that the tx() runs into use-after-free.
Then Nicolai Stange found more places in aoe have potential use-after-free problem with tx(). e.g. revalidate(), aoecmdatarw(), resend(), probe() and aoecmdcfgrsp(). Those functions also use aoenetxmit() to push packet to tx queue. So they should also use devhold() to increase the refcnt of skb->dev.
On the other hand, moving devput() to tx() causes that the refcnt of skb->dev be reduced to a negative value, because corresponding devhold() are not called in revalidate(), aoecmdatarw(), resend(), probe(), and aoecmdcfgrsp(). This patch fixed this issue.
In the Linux kernel, the following vulnerability has been resolved:
netfilter: brnetfilter: fix panic with metadatadst skb
Fix a kernel panic in the brnetfilter module when sending untagged traffic via a VxLAN device. This happens during the check for fragmentation in brnfdevqueuexmit.
It is dependent on: 1) the brnetfilter module being loaded; 2) net.bridge.bridge-nf-call-iptables set to 1; 3) a bridge with a VxLAN (single-vxlan-device) netdevice as a bridge port; 4) untagged frames with size higher than the VxLAN MTU forwarded/flooded
When forwarding the untagged packet to the VxLAN bridge port, before the netfilter hooks are called, brhandleegressvlantunnel is called and changes the skbdst to the tunnel dst. The tunneldst is a metadata type of dst, i.e., skbvaliddst(skb) is false, and metadata->dst.dev is NULL.
Then in the brnetfilter hooks, in brnfdevqueuexmit, there's a check for frames that needs to be fragmented: frames with higher MTU than the VxLAN device end up calling brnfipfragment, which in turns call ipskbdstmtu.
The ipdstmtu tries to use the skbdst(skb) as if it was a valid dst with valid dst->dev, thus the crash.
This case was never supported in the first place, so drop the packet instead.
PING 10.0.0.2 (10.0.0.2) from 0.0.0.0 h1-eth0: 2000(2028) bytes of data. [ 176.291791] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000110 [ 176.292101] Mem abort info: [ 176.292184] ESR = 0x0000000096000004 [ 176.292322] EC = 0x25: DABT (current EL), IL = 32 bits [ 176.292530] SET = 0, FnV = 0 [ 176.292709] EA = 0, S1PTW = 0 [ 176.292862] FSC = 0x04: level 0 translation fault [ 176.293013] Data abort info: [ 176.293104] ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000 [ 176.293488] CM = 0, WnR = 0, TnD = 0, TagAccess = 0 [ 176.293787] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [ 176.293995] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000043ef5000 [ 176.294166] [0000000000000110] pgd=0000000000000000, p4d=0000000000000000 [ 176.294827] Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP [ 176.295252] Modules linked in: vxlan ip6udptunnel udptunnel veth brnetfilter bridge stp llc ipv6 crct10difce [ 176.295923] CPU: 0 PID: 188 Comm: ping Not tainted 6.8.0-rc3-g5b3fbd61b9d1 #2 [ 176.296314] Hardware name: linux,dummy-virt (DT) [ 176.296535] pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 176.296808] pc : brnfdevqueuexmit+0x390/0x4ec [brnetfilter] [ 176.297382] lr : brnfdevqueuexmit+0x2ac/0x4ec [brnetfilter] [ 176.297636] sp : ffff800080003630 [ 176.297743] x29: ffff800080003630 x28: 0000000000000008 x27: ffff6828c49ad9f8 [ 176.298093] x26: ffff6828c49ad000 x25: 0000000000000000 x24: 00000000000003e8 [ 176.298430] x23: 0000000000000000 x22: ffff6828c4960b40 x21: ffff6828c3b16d28 [ 176.298652] x20: ffff6828c3167048 x19: ffff6828c3b16d00 x18: 0000000000000014 [ 176.298926] x17: ffffb0476322f000 x16: ffffb7e164023730 x15: 0000000095744632 [ 176.299296] x14: ffff6828c3f1c880 x13: 0000000000000002 x12: ffffb7e137926a70 [ 176.299574] x11: 0000000000000001 x10: ffff6828c3f1c898 x9 : 0000000000000000 [ 176.300049] x8 : ffff6828c49bf070 x7 : 0008460f18d5f20e x6 : f20e0100bebafeca [ 176.300302] x5 : ffff6828c7f918fe x4 : ffff6828c49bf070 x3 : 0000000000000000 [ 176.300586] x2 : 0000000000000000 x1 : ffff6828c3c7ad00 x0 : ffff6828c7f918f0 [ 176.300889] Call trace: [ 176.301123] brnfdevqueuexmit+0x390/0x4ec [brnetfilter] [ 176.301411] brnfpostrouting+0x2a8/0x3e4 [brnetfilter] [ 176.301703] nfhookslow+0x48/0x124 [ 176.302060] brforwardfinish+0xc8/0xe8 [bridge] [ 176.302371] brnfhookthresh+0x124/0x134 [brnetfilter] [ 176.302605] brnfforwardfinish+0x118/0x22c [brnetfilter] [ 176.302824] brnfforwardip.part.0+0x264/0x290 [brnetfilter] [ 176.303136] brnfforward+0x2b8/0x4e0 [brnetfilter] [ 176.303359] nfhookslow+0x48/0x124 [ 176.303 ---truncated---
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: check outstanding simultaneous SMB operations
If Client send simultaneous SMB operations to ksmbd, It exhausts too much memory through the "ksmbdworkcache”. It will cause OOM issue. ksmbd has a credit mechanism but it can't handle this problem. This patch add the check if it exceeds max credits to prevent this problem by assuming that one smb request consumes at least one credit.
In the Linux kernel, the following vulnerability has been resolved:
vmxnet3: Fix packet corruption in vmxnet3xdpxmitframe
Andrew and Nikolay reported connectivity issues with Cilium's service load-balancing in case of vmxnet3.
If a BPF program for native XDP adds an encapsulation header such as IPIP and transmits the packet out the same interface, then in case of vmxnet3 a corrupted packet is being sent and subsequently dropped on the path.
vmxnet3xdpxmitframe() which is called e.g. via vmxnet3runxdp() through vmxnet3xdpxmitback() calculates an incorrect DMA address:
page = virttopage(xdpf->data); tbi->dmaaddr = pagepoolgetdmaaddr(page) + VMXNET3XDPHEADROOM; dmasyncsinglefordevice(&adapter->pdev->dev, tbi->dmaaddr, bufsize, DMATODEVICE);
The above assumes a fixed offset (VMXNET3XDPHEADROOM), but the XDP BPF program could have moved xdp->data. While the passed bufsize is correct (xdpf->len), the dmaaddr needs to have a dynamic offset which can be calculated as xdpf->data - (void )xdpf, that is, xdp->data - xdp->datahardstart.
bpf: Fix overloading of MEMUNINIT's meaning
In the Linux kernel, the following vulnerability has been resolved:
RDMA/bnxtre: Fix a bug while setting up Level-2 PBL pages
Avoid memory corruption while setting up Level-2 PBL pages for the non MR resources when numpages > 256K.
There will be a single PDE page address (contiguous pages in the case of > PAGESIZE), but, current logic assumes multiple pages, leading to invalid memory access after 256K PBL entries in the PDE.
In the Linux kernel, the following vulnerability has been resolved:
virtionet: Add hashkeylength check
Add hashkeylength check in virtnetprobe() to avoid possible out of bound errors when setting/reading the hash key.
In the Linux kernel, the following vulnerability has been resolved:
virtiopci: Fix admin vq cleanup by using correct info pointer
vpmodernavqcleanup() and vpdelvqs() clean up admin vq resources by virtiopcivqinfo pointer. The info pointer of admin vq is stored in vpdev->adminvq.info instead of vpdev->vqs[]. Using the info pointer from vpdev->vqs[] for admin vq causes a kernel NULL pointer dereference bug. In vpmodernavqcleanup() and vpdelvqs(), get the info pointer from vpdev->adminvq.info for admin vq to clean up the resources. Also make info ptr as argument of vpdelvq() to be symmetric with vpsetupvq().
vpreset calls vpmodernavqcleanup, and causes the Call Trace: ================================================================== BUG: kernel NULL pointer dereference, address:0000000000000000 ... CPU: 49 UID: 0 PID: 4439 Comm: modprobe Not tainted 6.11.0-rc5 #1 RIP: 0010:vpreset+0x57/0x90 [virtiopci] Call Trace: <TASK> ... ? vpreset+0x57/0x90 [virtiopci] ? vpreset+0x38/0x90 [virtiopci] virtioresetdevice+0x1d/0x30 removevqcommon+0x1c/0x1a0 [virtionet] virtnetremove+0xa1/0xc0 [virtionet] virtiodevremove+0x46/0xa0 ... virtiopcidriverexit+0x14/0x810 [virtiopci] ==================================================================
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nfrejectipv6: fix potential crash in nfsendreset6()
I got a syzbot report without a repro [1] crashing in nfsendreset6()
I think the issue is that dev->hardheaderlen is zero, and we attempt later to push an Ethernet header.
Use LLMAXHEADER, as other functions in net/ipv6/netfilter/nfrejectipv6.c.
[1]
skbuff: skbunderpanic: text:ffffffff89b1d008 len:74 put:14 head:ffff88803123aa00 data:ffff88803123a9f2 tail:0x3c end:0x140 dev:syztun kernel BUG at net/core/skbuff.c:206 ! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 0 UID: 0 PID: 7373 Comm: syz.1.568 Not tainted 6.12.0-rc2-syzkaller-00631-g6d858708d465 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:skbpanic net/core/skbuff.c:206 [inline] RIP: 0010:skbunderpanic+0x14b/0x150 net/core/skbuff.c:216 Code: 0d 8d 48 c7 c6 60 a6 29 8e 48 8b 54 24 08 8b 0c 24 44 8b 44 24 04 4d 89 e9 50 41 54 41 57 41 56 e8 ba 30 38 02 48 83 c4 20 90 <0f> 0b 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 RSP: 0018:ffffc900045269b0 EFLAGS: 00010282 RAX: 0000000000000088 RBX: dffffc0000000000 RCX: cd66dacdc5d8e800 RDX: 0000000000000000 RSI: 0000000000000200 RDI: 0000000000000000 RBP: ffff88802d39a3d0 R08: ffffffff8174afec R09: 1ffff920008a4ccc R10: dffffc0000000000 R11: fffff520008a4ccd R12: 0000000000000140 R13: ffff88803123aa00 R14: ffff88803123a9f2 R15: 000000000000003c FS: 00007fdbee5ff6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000005d322000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> skbpush+0xe5/0x100 net/core/skbuff.c:2636 ethheader+0x38/0x1f0 net/ethernet/eth.c:83 devhardheader include/linux/netdevice.h:3208 [inline] nfsendreset6+0xce6/0x1270 net/ipv6/netfilter/nfrejectipv6.c:358 nftrejectineteval+0x3b9/0x690 net/netfilter/nftrejectinet.c:48 exprcallopseval net/netfilter/nftablescore.c:240 [inline] nftdochain+0x4ad/0x1da0 net/netfilter/nftablescore.c:288 nftdochaininet+0x418/0x6b0 net/netfilter/nftchainfilter.c:161 nfhookentryhookfn include/linux/netfilter.h:154 [inline] nfhookslow+0xc3/0x220 net/netfilter/core.c:626 nfhook include/linux/netfilter.h:269 [inline] NFHOOK include/linux/netfilter.h:312 [inline] brnfpreroutingipv6+0x63e/0x770 net/bridge/brnetfilteripv6.c:184 nfhookentryhookfn include/linux/netfilter.h:154 [inline] nfhookbridgepre net/bridge/brinput.c:277 [inline] brhandleframe+0x9fd/0x1530 net/bridge/brinput.c:424 netifreceiveskbcore+0x13e8/0x4570 net/core/dev.c:5562 netifreceiveskbonecore net/core/dev.c:5666 [inline] netifreceiveskb+0x12f/0x650 net/core/dev.c:5781 netifreceiveskbinternal net/core/dev.c:5867 [inline] netifreceiveskb+0x1e8/0x890 net/core/dev.c:5926 tunrxbatched+0x1b7/0x8f0 drivers/net/tun.c:1550 tungetuser+0x3056/0x47e0 drivers/net/tun.c:2007 tunchrwriteiter+0x10d/0x1f0 drivers/net/tun.c:2053 newsyncwrite fs/readwrite.c:590 [inline] vfswrite+0xa6d/0xc90 fs/readwrite.c:683 ksyswrite+0x183/0x2b0 fs/readwrite.c:736 dosyscallx64 arch/x86/entry/common.c:52 [inline] dosyscall64+0xf3/0x230 arch/x86/entry/common.c:83 entrySYSCALL64afterhwframe+0x77/0x7f RIP: 0033:0x7fdbeeb7d1ff Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 c9 8d 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 1c 8e 02 00 48 RSP: 002b:00007fdbee5ff000 EFLAGS: 00000293 ORIGRAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fdbeed36058 RCX: 00007fdbeeb7d1ff RDX: 000000000000008e RSI: 0000000020000040 RDI: 00000000000000c8 RBP: 00007fdbeebf12be R08: 0000000 ---truncated---
In the Linux kernel, the following vulnerability has been resolved:
sctp: properly validate chunk size in sctpsfootb()
A size validation fix similar to that in Commit 50619dbf8db7 ("sctp: add size validation when walking chunks") is also required in sctpsfootb() to address a crash reported by syzbot:
BUG: KMSAN: uninit-value in sctpsfootb+0x7f5/0xce0 net/sctp/smstatefuns.c:3712 sctpsfootb+0x7f5/0xce0 net/sctp/smstatefuns.c:3712 sctpdosm+0x181/0x93d0 net/sctp/smsideeffect.c:1166 sctpendpointbhrcv+0xc38/0xf90 net/sctp/endpointola.c:407 sctpinqpush+0x2ef/0x380 net/sctp/inqueue.c:88 sctprcv+0x3831/0x3b20 net/sctp/input.c:243 sctp4rcv+0x42/0x50 net/sctp/protocol.c:1159 ipprotocoldeliverrcu+0xb51/0x13d0 net/ipv4/ipinput.c:205 iplocaldeliverfinish+0x336/0x500 net/ipv4/ipinput.c:233
In the Linux kernel, the following vulnerability has been resolved:
net/mlx5e: CT: Fix null-ptr-deref in add rule err flow
In error flow of mlx5tcctentryaddrule(), in case ctruleadd() callback returns error, zonerule->attr is used uninitiated. Fix it to use attr which has the needed pointer value.
Kernel log: BUG: kernel NULL pointer dereference, address: 0000000000000110 RIP: 0010:mlx5tcctentryaddrule+0x2b1/0x2f0 [mlx5core] … Call Trace: <TASK> ? die+0x20/0x70 ? pagefaultoops+0x150/0x3e0 ? excpagefault+0x74/0x140 ? asmexcpagefault+0x22/0x30 ? mlx5tcctentryaddrule+0x2b1/0x2f0 [mlx5core] ? mlx5tcctentryaddrule+0x1d5/0x2f0 [mlx5core] mlx5tcctblockflowoffload+0xc6a/0xf90 [mlx5core] ? nfflowoffloadtuple+0xd8/0x190 [nfflowtable] nfflowoffloadtuple+0xd8/0x190 [nfflowtable] flowoffloadworkhandler+0x142/0x320 [nfflowtable] ? finishtaskswitch.isra.0+0x15b/0x2b0 processonework+0x16c/0x320 workerthread+0x28c/0x3a0 ? pfxworkerthread+0x10/0x10 kthread+0xb8/0xf0 ? pfxkthread+0x10/0x10 retfromfork+0x2d/0x50 ? pfxkthread+0x10/0x10 retfromforkasm+0x1a/0x30 </TASK>
In the Linux kernel, the following vulnerability has been resolved:
nvmet-auth: assign dhkey to NULL after kfreesensitive
ctrl->dhkey might be used across multiple calls to nvmetsetupdhgroup() for the same controller. So it's better to nullify it after release on error path in order to avoid double free later in nvmetdestroyauth().
Found by Linux Verification Center (linuxtesting.org) with Svace.
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: ISO: Fix UAF on isosocktimeout
conn->sk maybe have been unlinked/freed while waiting for isoconnlock so this checks if the conn->sk is still valid by checking if it part of isosklist.
In the Linux kernel, the following vulnerability has been resolved:
KVM: arm64: Fix shift-out-of-bounds bug
Fix a shift-out-of-bounds bug reported by UBSAN when running VM with MTE enabled host kernel.
UBSAN: shift-out-of-bounds in arch/arm64/kvm/sysregs.c:1988:14 shift exponent 33 is too large for 32-bit type 'int' CPU: 26 UID: 0 PID: 7629 Comm: qemu-kvm Not tainted 6.12.0-rc2 #34 Hardware name: IEI NF5280R7/Mitchell MB, BIOS 00.00. 2024-10-12 09:28:54 10/14/2024 Call trace: dumpbacktrace+0xa0/0x128 showstack+0x20/0x38 dumpstacklvl+0x74/0x90 dumpstack+0x18/0x28 ubsanhandleshiftoutofbounds+0xf8/0x1e0 resetclidr+0x10c/0x1c8 kvmresetsysregs+0x50/0x1c8 kvmresetvcpu+0xec/0x2b0 kvmvcpusettarget+0x84/0x158 kvmvcpusettarget+0x138/0x168 kvmarchvcpuioctlvcpuinit+0x40/0x2b0 kvmarchvcpuioctl+0x28c/0x4b8 kvmvcpuioctl+0x4bc/0x7a8 arm64sysioctl+0xb4/0x100 invokesyscall+0x70/0x100 el0svccommon.constprop.0+0x48/0xf0 doel0svc+0x24/0x38 el0svc+0x3c/0x158 el0t64synchandler+0x120/0x130 el0t64sync+0x194/0x198
In the Linux kernel, the following vulnerability has been resolved:
ext4: fix off by one issue in allocflexgd()
Wesley reported an issue:
================================================================== EXT4-fs (dm-5): resizing filesystem from 7168 to 786432 blocks ------------[ cut here ]------------ kernel BUG at fs/ext4/resize.c:324! CPU: 9 UID: 0 PID: 3576 Comm: resize2fs Not tainted 6.11.0+ #27 RIP: 0010:ext4resizefs+0x1212/0x12d0 Call Trace: ext4ioctl+0x4e0/0x1800 ext4ioctl+0x12/0x20 x64sysioctl+0x99/0xd0 x64syscall+0x1206/0x20d0 dosyscall64+0x72/0x110 entrySYSCALL64afterhwframe+0x76/0x7e ==================================================================
While reviewing the patch, Honza found that when adjusting resizebg in allocflexgd(), it was possible for flexgd->resizebg to be bigger than flexbgsize.
The reproduction of the problem requires the following:
ogroup = flexbgsize 2 n; osize = (ogroup + 1) groupsize; ngroup: [ogroup + flexbgsize, ogroup + flexbgsize 2) osize = (ngroup + 1) groupsize;
Take n=0,flexbgsize=16 as an example:
last:15 |o---------------|--------------n-| ogroup:0 resize to ngroup:30
The corresponding reproducer is:
img=test.img rm -f $img truncate -s 600M $img mkfs.ext4 -F $img -b 1024 -G 16 8M dev=losetup -f --show $img mkdir -p /tmp/test mount $dev /tmp/test resize2fs $dev 248M
Delete the problematic plus 1 to fix the issue, and add a WARNONONCE() to prevent the issue from happening again.
[ Note: another reproucer which this commit fixes is:
img=test.img rm -f $img truncate -s 25MiB $img mkfs.ext4 -b 4096 -E nodiscard,lazyitableinit=0,lazyjournalinit=0 $img truncate -s 3GiB $img dev=losetup -f --show $img mkdir -p /tmp/test mount $dev /tmp/test resize2fs $dev 3G umount $dev losetup -d $dev
-- TYT ]
In the Linux kernel, the following vulnerability has been resolved:
drm/xe/vm: move xaalloc to prevent UAF
Evil user can guess the next id of the vm before the ioctl completes and then call vm destroy ioctl to trigger UAF since create ioctl is still referencing the same vm. Move the xaalloc all the way to the end to prevent this.
v2: - Rebase
(cherry picked from commit dcfd3971327f3ee92765154baebbaece833d3ca9)