cve-2022-48862
Vulnerability from cvelistv5
Published
2024-07-16 12:25
Modified
2024-12-19 08:09
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: vhost: fix hung thread due to erroneous iotlb entries In vhost_iotlb_add_range_ctx(), range size can overflow to 0 when start is 0 and last is ULONG_MAX. One instance where it can happen is when userspace sends an IOTLB message with iova=size=uaddr=0 (vhost_process_iotlb_msg). So, an entry with size = 0, start = 0, last = ULONG_MAX ends up in the iotlb. Next time a packet is sent, iotlb_access_ok() loops indefinitely due to that erroneous entry. Call Trace: <TASK> iotlb_access_ok+0x21b/0x3e0 drivers/vhost/vhost.c:1340 vq_meta_prefetch+0xbc/0x280 drivers/vhost/vhost.c:1366 vhost_transport_do_send_pkt+0xe0/0xfd0 drivers/vhost/vsock.c:104 vhost_worker+0x23d/0x3d0 drivers/vhost/vhost.c:372 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 </TASK> Reported by syzbot at: https://syzkaller.appspot.com/bug?extid=0abd373e2e50d704db87 To fix this, do two things: 1. Return -EINVAL in vhost_chr_write_iter() when userspace asks to map a range with size 0. 2. Fix vhost_iotlb_add_range_ctx() to handle the range [0, ULONG_MAX] by splitting it into two entries.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d9a747e6b6561280bf1791bb24c5e9e082193dadPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e2ae38cf3d91837a493cb2093c87700ff3cbe667Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f8d88e86e90ea1002226d7ac2430152bfea003d1Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d9a747e6b6561280bf1791bb24c5e9e082193dadPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e2ae38cf3d91837a493cb2093c87700ff3cbe667Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f8d88e86e90ea1002226d7ac2430152bfea003d1Patch
Impacted products
Vendor Product Version
Linux Linux Version: 0bbe30668d89ec8a309f28ced6d092c90fb23e8c
Version: 0bbe30668d89ec8a309f28ced6d092c90fb23e8c
Version: 0bbe30668d89ec8a309f28ced6d092c90fb23e8c
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   Linux Linux Version: 5.7
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