Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix null-ptr-deref in block_touch_buffer tracepoint Patch series "nilfs2: fix null-ptr-deref bugs on block tracepoints". This series fixes null pointer dereference bugs that occur when using nilfs2 and two block-related tracepoints. This patch (of 2): It has been reported that when using "block:block_touch_buffer" tracepoint, touch_buffer() called from __nilfs_get_folio_block() causes a NULL pointer dereference, or a general protection fault when KASAN is enabled. This happens because since the tracepoint was added in touch_buffer(), it references the dev_t member bh->b_bdev->bd_dev regardless of whether the buffer head has a pointer to a block_device structure. In the current implementation, the block_device structure is set after the function returns to the caller. Here, touch_buffer() is used to mark the folio/page that owns the buffer head as accessed, but the common search helper for folio/page used by the caller function was optimized to mark the folio/page as accessed when it was reimplemented a long time ago, eliminating the need to call touch_buffer() here in the first place. So this solves the issue by eliminating the touch_buffer() call itself.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 5305cb830834549b9203ad4d009ad5483c5e293f before 085556bf8c70e2629e02e79268dac3016a08b8bf; affected 5305cb830834549b9203ad4d009ad5483c5e293f before 6438f3f42cda825f6f59b4e45ac3a1da28a6f2c9; affected 5305cb830834549b9203ad4d009ad5483c5e293f before b017697a517f8779ada4e8ce1c2c75dbf60a2636; affected 5305cb830834549b9203ad4d009ad5483c5e293f before 19c71cdd77973f99a9adc3190130bc3aa7ae5423; affected 5305cb830834549b9203ad4d009ad5483c5e293f before 3b2a4fd9bbee77afdd3ed5a05a0c02b6cde8d3b9; affected 5305cb830834549b9203ad4d009ad5483c5e293f before 59b49ca67cca7b007a5afd3de0283c8008157665; affected 5305cb830834549b9203ad4d009ad5483c5e293f before 77e47f89d32c2d72eb33d0becbce7abe14d061f4; affected 5305cb830834549b9203ad4d009ad5483c5e293f before cd45e963e44b0f10d90b9e6c0e8b4f47f3c92471 |
| Linux / Linux | affected 3.9; unaffected 0 before 3.9; unaffected 4.19.325 through 4.19.*; unaffected 5.4.287 through 5.4.*; unaffected 5.10.231 through 5.10.*; unaffected 5.15.174 through 5.15.*; unaffected 6.1.119 through 6.1.*; unaffected 6.6.63 through 6.6.*; unaffected 6.11.10 through 6.11.*; unaffected 6.12 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/085556bf8c70e2629e02e79268dac3016a08b8bf
- https://git.kernel.org/stable/c/6438f3f42cda825f6f59b4e45ac3a1da28a6f2c9
- https://git.kernel.org/stable/c/b017697a517f8779ada4e8ce1c2c75dbf60a2636
- https://git.kernel.org/stable/c/19c71cdd77973f99a9adc3190130bc3aa7ae5423
- https://git.kernel.org/stable/c/3b2a4fd9bbee77afdd3ed5a05a0c02b6cde8d3b9
- https://git.kernel.org/stable/c/59b49ca67cca7b007a5afd3de0283c8008157665
- https://git.kernel.org/stable/c/77e47f89d32c2d72eb33d0becbce7abe14d061f4
- https://git.kernel.org/stable/c/cd45e963e44b0f10d90b9e6c0e8b4f47f3c92471
ADP enrichment
No English description supplied.