Description
In the Linux kernel, the following vulnerability has been resolved: dm: fix a buffer overflow in ioctl processing Tony Asleson (using Claude) found a buffer overflow in dm-ioctl in the function retrieve_status: 1. The code in retrieve_status checks that the output string fits into the output buffer and writes the output string there 2. Then, the code aligns the "outptr" variable to the next 8-byte boundary: outptr = align_ptr(outptr); 3. The alignment doesn't check overflow, so outptr could point past the buffer end 4. The "for" loop is iterated again, it executes: remaining = len - (outptr - outbuf); 5. If "outptr" points past "outbuf + len", the arithmetics wraps around and the variable "remaining" contains unusually high number 6. With "remaining" being high, the code writes more data past the end of the buffer Luckily, this bug has no security implications because: 1. Only root can issue device mapper ioctls 2. The commonly used libraries that communicate with device mapper (libdevmapper and devicemapper-rs) use buffer size that is aligned to 8 bytes - thus, "outptr = align_ptr(outptr)" can't overshoot the input buffer and the bug can't happen accidentally
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
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < c8c5311237448f6ffeecc9aec2362e3692623668affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 448ee8fb79c26a26599ffa4b2adeb4322d3d3d8caffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 526ff9126a0ae087b65726e1faf31114c718020daffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < f0b0b09d9840838ae77ccdd6a62de0daef4e6e0aaffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < d271631023cbe1cbe7c31a0275ab797883be6e0aaffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 5af6a879e915ae7bcd83695c316ebb32e1c61bc2affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 8daa6c708ef524089ae43f2aed9190acb26d7df8affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 2fa49cc884f6496a915c35621ba4da35649bf159affected
Linux Linux
Default version status: affected
2.6.12affected0 to < 2.6.12unaffected5.10.258 to ≤ 5.10.*unaffected5.15.209 to ≤ 5.15.*unaffected6.1.175 to ≤ 6.1.*unaffected6.6.140 to ≤ 6.6.*unaffected6.12.88 to ≤ 6.12.*unaffected6.18.30 to ≤ 6.18.*unaffected7.0.7 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/c8c5311237448f6ffeecc9aec2362e3692623668 ↗
- https://git.kernel.org/stable/c/448ee8fb79c26a26599ffa4b2adeb4322d3d3d8c ↗
- https://git.kernel.org/stable/c/526ff9126a0ae087b65726e1faf31114c718020d ↗
- https://git.kernel.org/stable/c/f0b0b09d9840838ae77ccdd6a62de0daef4e6e0a ↗
- https://git.kernel.org/stable/c/d271631023cbe1cbe7c31a0275ab797883be6e0a ↗
- https://git.kernel.org/stable/c/5af6a879e915ae7bcd83695c316ebb32e1c61bc2 ↗
- https://git.kernel.org/stable/c/8daa6c708ef524089ae43f2aed9190acb26d7df8 ↗
- https://git.kernel.org/stable/c/2fa49cc884f6496a915c35621ba4da35649bf159 ↗
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html ↗