Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: pds_core: fix cmd_regs access racing BAR unmap on reset pdsc_reset_prepare() and pdsc_reset_done()'s pdsc_map_bars() error path clear/iounmap cmd_regs without devcmd_lock, and pdsc_legacy_firmware_update()'s download loop derefs cmd_regs after dropping and retaking the lock without re-checking. An FLR concurrent with a devlink flash can unmap cmd_regs under an in-flight devcmd, causing a NULL deref or a write to unmapped MMIO. Take devcmd_lock across the BAR unmap/remap, and re-check cmd_regs in the download loop. Only the PF maps cmd_regs and runs devcmd, so skip the unmap on a VF, as pdsc_remove() and pdsc_reset_done() already do. A reset that completes entirely within the unlocked window is not a correctness problem for the image: the device clears its update session, so a resumed download is rejected, and it verifies the staged image before writing a flash slot, reporting PDS_RC_BAD_FW rather than activating it. pdsc_unmap_bars() also clears info_regs, intr_status and intr_ctrl. The interrupt and start/stop readers of those are quiesced before the unmap by pdsc_fw_down(), which frees the interrupts and tears down the queues. The debugfs readers are not, since those files outlive a reset; that is pre-existing and out of scope here.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected f6ec6ac9432941ec85a2221c91b1ecfc85680d89 before 0bf9f3bae3c4b1eadb7a2bf63350333db7dac0d9; affected e96094c1d11cce4deb5da3c0500d49041ab845b8 before 2cc697565fd19b5ba2d100cdd4a20dd6d263abc2; affected e96094c1d11cce4deb5da3c0500d49041ab845b8 before fa31bd14c5042c6315bb2182c963f03ca6e79ca4; affected e96094c1d11cce4deb5da3c0500d49041ab845b8 before 09f831bfe39de5b8026fefb3d106b5cc93272170; affected e96094c1d11cce4deb5da3c0500d49041ab845b8 before 7980325b2f71e3f65c1323c39792e2455da6fab6; affected 692488941283d72362274620b9abd28109fc459f; affected 6.6.16 before 6.6.158; affected 6.7.4 before 6.8 |
| Linux / Linux | affected 6.8; unaffected 0 before 6.8; unaffected 6.6.158 through 6.6.*; unaffected 6.12.111 through 6.12.*; unaffected 6.18.53 through 6.18.*; unaffected 7.2.7 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/0bf9f3bae3c4b1eadb7a2bf63350333db7dac0d9
- https://git.kernel.org/stable/c/2cc697565fd19b5ba2d100cdd4a20dd6d263abc2
- https://git.kernel.org/stable/c/fa31bd14c5042c6315bb2182c963f03ca6e79ca4
- https://git.kernel.org/stable/c/09f831bfe39de5b8026fefb3d106b5cc93272170
- https://git.kernel.org/stable/c/7980325b2f71e3f65c1323c39792e2455da6fab6