In the Linux kernel, the following vulnerability has been resolved: iouring: check for non-NULL file pointer in iofilecanpoll() In earlier kernels, it was possible to trigger a NULL pointer dereference off the forced async preparation path, if no file had been assigned. The trace leading to that looks as follows: BUG: kernel NULL pointer dereference, address: 00000000000000b0 PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP CPU: 67 PID: 1633 Comm: buf-ring-invali Not tainted 6.8.0-rc3+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS unknown 2/2/2022 RIP: 0010:iobufferselect+0xc3/0x210 Code: 00 00 48 39 d1 0f 82 ae 00 00 00 48 81 4b 48 00 00 01 00 48 89 73 70 0f b7 50 0c 66 89 53 42 85 ed 0f 85 d2 00 00 00 48 8b 13 <48> 8b 92 b0 00 00 00 48 83 7a 40 00 0f 84 21 01 00 00 4c 8b 20 5b RSP: 0018:ffffb7bec38c7d88 EFLAGS: 00010246 RAX: ffff97af2be61000 RBX: ffff97af234f1700 RCX: 0000000000000040 RDX: 0000000000000000 RSI: ffff97aecfb04820 RDI: ffff97af234f1700 RBP: 0000000000000000 R08: 0000000000200030 R09: 0000000000000020 R10: ffffb7bec38c7dc8 R11: 000000000000c000 R12: ffffb7bec38c7db8 R13: ffff97aecfb05800 R14: ffff97aecfb05800 R15: ffff97af2be5e000 FS: 00007f852f74b740(0000) GS:ffff97b1eeec0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000000000b0 CR3: 000000016deab005 CR4: 0000000000370ef0 Call Trace: <TASK> ? _die+0x1f/0x60 ? pagefaultoops+0x14d/0x420 ? douseraddrfault+0x61/0x6a0 ? excpagefault+0x6c/0x150 ? asmexcpagefault+0x22/0x30 ? iobufferselect+0xc3/0x210 _ioimportiovec+0xb5/0x120 ioreadvprepasync+0x36/0x70 ioqueuesqefallback+0x20/0x260 iosubmitsqes+0x314/0x630 _dosysiouringenter+0x339/0xbc0 ? _dosysiouringregister+0x11b/0xc50 ? vmmmappgoff+0xce/0x160 dosyscall64+0x5f/0x180 entrySYSCALL64afterhwframe+0x46/0x4e RIP: 0033:0x55e0a110a67e Code: ba cc 00 00 00 45 31 c0 44 0f b6 92 d0 00 00 00 31 d2 41 b9 08 00 00 00 41 83 e2 01 41 c1 e2 04 41 09 c2 b8 aa 01 00 00 0f 05 <c3> 90 89 30 eb a9 0f 1f 40 00 48 8b 42 20 8b 00 a8 06 75 af 85 f6 because the request is marked forced ASYNC and has a bad file fd, and hence takes the forced async prep path. Current kernels with the request async prep cleaned up can no longer hit this issue, but for ease of backporting, let's add this safety check in here too as it really doesn't hurt. For both cases, this will inevitably end with a CQE posted with -EBADF.
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{ "availability": "No subscription required", "binaries": [ { "binary_name": "linux-buildinfo-6.8.0-44-generic", "binary_version": "6.8.0-44.44.1" }, { "binary_name": "linux-headers-6.8.0-44-generic", "binary_version": "6.8.0-44.44.1" }, { "binary_name": "linux-image-6.8.0-44-generic", "binary_version": "6.8.0-44.44.1" }, { "binary_name": "linux-image-6.8.0-44-generic-dbgsym", "binary_version": "6.8.0-44.44.1" }, { "binary_name": "linux-modules-6.8.0-44-generic", "binary_version": "6.8.0-44.44.1" }, { "binary_name": "linux-riscv-headers-6.8.0-44", "binary_version": "6.8.0-44.44.1" }, { "binary_name": "linux-riscv-tools-6.8.0-44", "binary_version": "6.8.0-44.44.1" }, { "binary_name": "linux-tools-6.8.0-44-generic", "binary_version": "6.8.0-44.44.1" } ] }
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