Description
In the Linux kernel, the following vulnerability has been resolved: dmaengine: dw-edma: Serialize channel state checks pause() and resume() read and update channel state without holding vc.lock, while the interrupt handlers update the same state under it. Take the same lock around those state checks so that request, status, and configured stay consistent. For example, pause() can observe EDMA_ST_BUSY right before the interrupt handler completes the final descriptor and moves the channel to EDMA_ST_IDLE, and then record EDMA_REQ_PAUSE on an already idle channel. No further interrupt will acknowledge the request, and since issue_pending() requires EDMA_REQ_NONE, the channel is wedged for good: terminate_all() leaves the stale request behind, so even reconfiguring the channel does not recover it. issue_pending() already runs under vc.lock, but it tests configured before taking it. Move that test under the lock as well, so configured, request, and status are evaluated as one channel-state snapshot.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf to < be0072af8ce6e9458cc586e0e8b41a251e7d4316affectede63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf to < 2d76b91deeab973dd8a8c2ee587ce27f881de768affectede63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf to < 3001cfcee30dcc81f8b3774319c12067f126e49aaffectede63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf to < b6293a8a38f4d5866ce1a264c138265a02e4c53aaffectede63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf to < da16a02f0998a0d455ce6265b836b29ad92e6e58affectede63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf to < fe0ffa0190e862ed71e8c1a476090f648c9cb7d9affectede63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf to < 6fc436e1500c5e4f0dde2a3dbadf6d898057be8faffectede63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf to < f7d1619f3e10c619b62c6cd6d95371b5c526c85aaffected
Linux Linux
Default version status: affected
5.3affected0 to < 5.3unaffected5.10.270 to ≤ 5.10.*unaffected5.15.221 to ≤ 5.15.*unaffected6.1.188 to ≤ 6.1.*unaffected6.6.157 to ≤ 6.6.*unaffected6.12.110 to ≤ 6.12.*unaffected6.18.52 to ≤ 6.18.*unaffected7.2.6 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/be0072af8ce6e9458cc586e0e8b41a251e7d4316 ↗
- https://git.kernel.org/stable/c/2d76b91deeab973dd8a8c2ee587ce27f881de768 ↗
- https://git.kernel.org/stable/c/3001cfcee30dcc81f8b3774319c12067f126e49a ↗
- https://git.kernel.org/stable/c/b6293a8a38f4d5866ce1a264c138265a02e4c53a ↗
- https://git.kernel.org/stable/c/da16a02f0998a0d455ce6265b836b29ad92e6e58 ↗
- https://git.kernel.org/stable/c/fe0ffa0190e862ed71e8c1a476090f648c9cb7d9 ↗
- https://git.kernel.org/stable/c/6fc436e1500c5e4f0dde2a3dbadf6d898057be8f ↗
- https://git.kernel.org/stable/c/f7d1619f3e10c619b62c6cd6d95371b5c526c85a ↗