Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net/smc: stop killed, freed and out_of_sync sharing a byte The three connection state flags are single-bit bitfields, so they occupy one byte of struct smc_connection and every store to one is a read-modify-write of the other two: u8 killed : 1; u8 freed : 1; u8 out_of_sync : 1; They are not written under a common lock. smc_cdc_msg_validate() sets out_of_sync from the receive tasklet, while smc_conn_kill() sets killed from process context under lock_sock(), and the receive path does not defer to the backlog when the socket is owned -- smc_cdc_msg_recv() takes only bh_lock_sock(). Give each flag its own byte so a store no longer touches its neighbours. All readers test them as booleans and are unchanged. struct smc_connection grows by two bytes.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected b286a0651e4404ab96cdfdcdad8a839a26b3751e before 297e96f38d3e4f1a3b84068950dd5c7a55bbdc7b; affected b286a0651e4404ab96cdfdcdad8a839a26b3751e before 09a9cbadc05f452405de31012bd2c428b601291a; affected b286a0651e4404ab96cdfdcdad8a839a26b3751e before 313f79149eb337411c64e2c247234b62ef9a3cb9; affected b286a0651e4404ab96cdfdcdad8a839a26b3751e before 2cb7a8d64b7e8ccdc69bbe48fe9c4eaa79c33aec; affected b286a0651e4404ab96cdfdcdad8a839a26b3751e before db51a8658c11a82432b64999519a269c3aabb447 |
| Linux / Linux | affected 5.8; unaffected 0 before 5.8; unaffected 6.6.160 through 6.6.*; unaffected 6.12.112 through 6.12.*; unaffected 6.18.50 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/297e96f38d3e4f1a3b84068950dd5c7a55bbdc7b
- https://git.kernel.org/stable/c/09a9cbadc05f452405de31012bd2c428b601291a
- https://git.kernel.org/stable/c/313f79149eb337411c64e2c247234b62ef9a3cb9
- https://git.kernel.org/stable/c/2cb7a8d64b7e8ccdc69bbe48fe9c4eaa79c33aec
- https://git.kernel.org/stable/c/db51a8658c11a82432b64999519a269c3aabb447
ADP enrichment
No English description supplied.
No references supplied.