CVE-2024-38626 (GCVE-0-2024-38626)
Vulnerability from cvelistv5
Published
2024-06-21 10:18
Modified
2025-05-04 09:15
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: fuse: clear FR_SENT when re-adding requests into pending list The following warning was reported by lee bruce: ------------[ cut here ]------------ WARNING: CPU: 0 PID: 8264 at fs/fuse/dev.c:300 fuse_request_end+0x685/0x7e0 fs/fuse/dev.c:300 Modules linked in: CPU: 0 PID: 8264 Comm: ab2 Not tainted 6.9.0-rc7 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) RIP: 0010:fuse_request_end+0x685/0x7e0 fs/fuse/dev.c:300 ...... Call Trace: <TASK> fuse_dev_do_read.constprop.0+0xd36/0x1dd0 fs/fuse/dev.c:1334 fuse_dev_read+0x166/0x200 fs/fuse/dev.c:1367 call_read_iter include/linux/fs.h:2104 [inline] new_sync_read fs/read_write.c:395 [inline] vfs_read+0x85b/0xba0 fs/read_write.c:476 ksys_read+0x12f/0x260 fs/read_write.c:619 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xce/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f ...... </TASK> The warning is due to the FUSE_NOTIFY_RESEND notify sent by the write() syscall in the reproducer program and it happens as follows: (1) calls fuse_dev_read() to read the INIT request The read succeeds. During the read, bit FR_SENT will be set on the request. (2) calls fuse_dev_write() to send an USE_NOTIFY_RESEND notify The resend notify will resend all processing requests, so the INIT request is moved from processing list to pending list again. (3) calls fuse_dev_read() with an invalid output address fuse_dev_read() will try to copy the same INIT request to the output address, but it will fail due to the invalid address, so the INIT request is ended and triggers the warning in fuse_request_end(). Fix it by clearing FR_SENT when re-adding requests into pending list.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/246014876d782bbf2e652267482cd2e799fb5fcd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/533070db659a9589310a743e9de14cf9d651ffaf
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/246014876d782bbf2e652267482cd2e799fb5fcd
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/533070db659a9589310a743e9de14cf9d651ffaf
Impacted products
Vendor Product Version
Linux Linux Version: 760eac73f9f69aa28fcb3050b4946c2dcc656d12
Version: 760eac73f9f69aa28fcb3050b4946c2dcc656d12
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   Linux Linux Version: 6.9
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