Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: netfs/fscache: Add a memory barrier for FSCACHE_VOLUME_CREATING In fscache_create_volume(), there is a missing memory barrier between the bit-clearing operation and the wake-up operation. This may cause a situation where, after a wake-up, the bit-clearing operation hasn't been detected yet, leading to an indefinite wait. The triggering process is as follows: [cookie1] [cookie2] [volume_work] fscache_perform_lookup fscache_create_volume fscache_perform_lookup fscache_create_volume fscache_create_volume_work cachefiles_acquire_volume clear_and_wake_up_bit test_and_set_bit test_and_set_bit goto maybe_wait goto no_wait In the above process, cookie1 and cookie2 has the same volume. When cookie1 enters the -no_wait- process, it will clear the bit and wake up the waiting process. If a barrier is missing, it may cause cookie2 to remain in the -wait- process indefinitely. In commit 3288666c7256 ("fscache: Use clear_and_wake_up_bit() in fscache_create_volume_work()"), barriers were added to similar operations in fscache_create_volume_work(), but fscache_create_volume() was missed. By combining the clear and wake operations into clear_and_wake_up_bit() to fix this issue.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected bfa22da3ed652aa15acd4246fa13a0de6dbe4a59 before ddab02607eed9e415dc62fde421d4329e5345315; affected bfa22da3ed652aa15acd4246fa13a0de6dbe4a59 before 539fabba965e119b98066fc6ba5257b5eaf4eda2; affected bfa22da3ed652aa15acd4246fa13a0de6dbe4a59 before 8beb682cc9a0798a280bbb95e3e41617237090b2; affected bfa22da3ed652aa15acd4246fa13a0de6dbe4a59 before 8cc1df3113cb71a0df2c46dd5b102c9e11c8a8c6; affected bfa22da3ed652aa15acd4246fa13a0de6dbe4a59 before 22f9400a6f3560629478e0a64247b8fcc811a24d |
| Linux / Linux | affected 5.17; unaffected 0 before 5.17; unaffected 6.1.120 through 6.1.*; unaffected 6.6.64 through 6.6.*; unaffected 6.11.11 through 6.11.*; unaffected 6.12.2 through 6.12.*; unaffected 6.13 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/ddab02607eed9e415dc62fde421d4329e5345315
- https://git.kernel.org/stable/c/539fabba965e119b98066fc6ba5257b5eaf4eda2
- https://git.kernel.org/stable/c/8beb682cc9a0798a280bbb95e3e41617237090b2
- https://git.kernel.org/stable/c/8cc1df3113cb71a0df2c46dd5b102c9e11c8a8c6
- https://git.kernel.org/stable/c/22f9400a6f3560629478e0a64247b8fcc811a24d
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.