cve-2022-48760
Vulnerability from cvelistv5
Published
2024-06-20 11:13
Modified
2024-08-03 15:25
Severity ?
Summary
USB: core: Fix hang in usb_kill_urb by adding memory barriers
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/26fbe9772b8c459687930511444ce443011f86bf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/546ba238535d925254e0b3f12012a5c55801e2f3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5904dfd3ddaff3bf4a41c3baf0a8e8f31ed4599b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5f138ef224dffd15d5e5c5b095859719e0038427
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9340226388c66a7e090ebb00e91ed64a753b6c26
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9c61fce322ac2ef7fecf025285353570d60e41d6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b50f5ca60475710bbc9a3af32fbfc17b1e69c2f0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c9a18f7c5b071dce5e6939568829d40994866ab0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e3b131e30e612ff0e32de6c1cb4f69f89db29193
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: core: Fix hang in usb_kill_urb by adding memory barriers\n\nThe syzbot fuzzer has identified a bug in which processes hang waiting\nfor usb_kill_urb() to return.  It turns out the issue is not unlinking\nthe URB; that works just fine.  Rather, the problem arises when the\nwakeup notification that the URB has completed is not received.\n\nThe reason is memory-access ordering on SMP systems.  In outline form,\nusb_kill_urb() and __usb_hcd_giveback_urb() operating concurrently on\ndifferent CPUs perform the following actions:\n\nCPU 0\t\t\t\t\tCPU 1\n----------------------------\t\t---------------------------------\nusb_kill_urb():\t\t\t\t__usb_hcd_giveback_urb():\n  ...\t\t\t\t\t  ...\n  atomic_inc(\u0026urb-\u003ereject);\t\t  atomic_dec(\u0026urb-\u003euse_count);\n  ...\t\t\t\t\t  ...\n  wait_event(usb_kill_urb_queue,\n\tatomic_read(\u0026urb-\u003euse_count) == 0);\n\t\t\t\t\t  if (atomic_read(\u0026urb-\u003ereject))\n\t\t\t\t\t\twake_up(\u0026usb_kill_urb_queue);\n\nConfining your attention to urb-\u003ereject and urb-\u003euse_count, you can\nsee that the overall pattern of accesses on CPU 0 is:\n\n\twrite urb-\u003ereject, then read urb-\u003euse_count;\n\nwhereas the overall pattern of accesses on CPU 1 is:\n\n\twrite urb-\u003euse_count, then read urb-\u003ereject.\n\nThis pattern is referred to in memory-model circles as SB (for \"Store\nBuffering\"), and it is well known that without suitable enforcement of\nthe desired order of accesses -- in the form of memory barriers -- it\nis entirely possible for one or both CPUs to execute their reads ahead\nof their writes.  The end result will be that sometimes CPU 0 sees the\nold un-decremented value of urb-\u003euse_count while CPU 1 sees the old\nun-incremented value of urb-\u003ereject.  Consequently CPU 0 ends up on\nthe wait queue and never gets woken up, leading to the observed hang\nin usb_kill_urb().\n\nThe same pattern of accesses occurs in usb_poison_urb() and the\nfailure pathway of usb_hcd_submit_urb().\n\nThe problem is fixed by adding suitable memory barriers.  To provide\nproper memory-access ordering in the SB pattern, a full barrier is\nrequired on both CPUs.  The atomic_inc() and atomic_dec() accesses\nthemselves don\u0027t provide any memory ordering, but since they are\npresent, we can use the optimized smp_mb__after_atomic() memory\nbarrier in the various routines to obtain the desired effect.\n\nThis patch adds the necessary memory barriers."
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    "cveId": "CVE-2022-48760",
    "datePublished": "2024-06-20T11:13:38.532Z",
    "dateReserved": "2024-06-20T11:09:39.059Z",
    "dateUpdated": "2024-08-03T15:25:01.565Z",
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  }
}


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