Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: comedi: Make insn_rw_emulate_bits() do insn->n samples The `insn_rw_emulate_bits()` function is used as a default handler for `INSN_READ` instructions for subdevices that have a handler for `INSN_BITS` but not for `INSN_READ`. Similarly, it is used as a default handler for `INSN_WRITE` instructions for subdevices that have a handler for `INSN_BITS` but not for `INSN_WRITE`. It works by emulating the `INSN_READ` or `INSN_WRITE` instruction handling with a constructed `INSN_BITS` instruction. However, `INSN_READ` and `INSN_WRITE` instructions are supposed to be able read or write multiple samples, indicated by the `insn->n` value, but `insn_rw_emulate_bits()` currently only handles a single sample. For `INSN_READ`, the comedi core will copy `insn->n` samples back to user-space. (That triggered KASAN kernel-infoleak errors when `insn->n` was greater than 1, but that is being fixed more generally elsewhere in the comedi core.) Make `insn_rw_emulate_bits()` either handle `insn->n` samples, or return an error, to conform to the general expectation for `INSN_READ` and `INSN_WRITE` handlers.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 before ab77e85bd3bc006ef40738f26f446a660813da44; affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 before ae8bc1f07bcb31b8636420e03d1f9c3df6219a2b; affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 before 842f307a1d115b24f2bcb2415c4e344f11f55930; affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 before 92352ed2f9ac422181e381c2430c2d0dfb46faa0; affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 before dc0a2f142d655700db43de90cb6abf141b73d908; affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 before 7afba9221f70d4cbce0f417c558879cba0eb5e66 |
| Linux / Linux | affected 2.6.29; unaffected 0 before 2.6.29; unaffected 5.15.190 through 5.15.*; unaffected 6.1.149 through 6.1.*; unaffected 6.6.103 through 6.6.*; unaffected 6.12.44 through 6.12.*; unaffected 6.16.4 through 6.16.*; unaffected 6.17 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/ab77e85bd3bc006ef40738f26f446a660813da44
- https://git.kernel.org/stable/c/ae8bc1f07bcb31b8636420e03d1f9c3df6219a2b
- https://git.kernel.org/stable/c/842f307a1d115b24f2bcb2415c4e344f11f55930
- https://git.kernel.org/stable/c/92352ed2f9ac422181e381c2430c2d0dfb46faa0
- https://git.kernel.org/stable/c/dc0a2f142d655700db43de90cb6abf141b73d908
- https://git.kernel.org/stable/c/7afba9221f70d4cbce0f417c558879cba0eb5e66
ADP enrichment
No English description supplied.
No English description supplied.