Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: cdrom: rearrange last_media_change check to avoid unintentional overflow When running syzkaller with the newly reintroduced signed integer wrap sanitizer we encounter this splat: [ 366.015950] UBSAN: signed-integer-overflow in ../drivers/cdrom/cdrom.c:2361:33 [ 366.021089] -9223372036854775808 - 346321 cannot be represented in type '__s64' (aka 'long long') [ 366.025894] program syz-executor.4 is using a deprecated SCSI ioctl, please convert it to SG_IO [ 366.027502] CPU: 5 PID: 28472 Comm: syz-executor.7 Not tainted 6.8.0-rc2-00035-gb3ef86b5a957 #1 [ 366.027512] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 366.027518] Call Trace: [ 366.027523] <TASK> [ 366.027533] dump_stack_lvl+0x93/0xd0 [ 366.027899] handle_overflow+0x171/0x1b0 [ 366.038787] ata1.00: invalid multi_count 32 ignored [ 366.043924] cdrom_ioctl+0x2c3f/0x2d10 [ 366.063932] ? __pm_runtime_resume+0xe6/0x130 [ 366.071923] sr_block_ioctl+0x15d/0x1d0 [ 366.074624] ? __pfx_sr_block_ioctl+0x10/0x10 [ 366.077642] blkdev_ioctl+0x419/0x500 [ 366.080231] ? __pfx_blkdev_ioctl+0x10/0x10 ... Historically, the signed integer overflow sanitizer did not work in the kernel due to its interaction with `-fwrapv` but this has since been changed [1] in the newest version of Clang. It was re-enabled in the kernel with Commit 557f8c582a9ba8ab ("ubsan: Reintroduce signed overflow sanitizer"). Let's rearrange the check to not perform any arithmetic, thus not tripping the sanitizer.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 67f1e027c27054e641584655020a417eaac9cb3a before 0c97527e916054acc4a46ffb02842988acb2e92b; affected 67f1e027c27054e641584655020a417eaac9cb3a before 3ee21e14c8c329168a0b66bab00ecd18f5d0dee3; affected 67f1e027c27054e641584655020a417eaac9cb3a before e809bc112712da8f7e15822674c6562da6cdf24c; affected 67f1e027c27054e641584655020a417eaac9cb3a before efb905aeb44b0e99c0e6b07865b1885ae0471ebf |
| Linux / Linux | affected 5.16; unaffected 0 before 5.16; unaffected 6.1.98 through 6.1.*; unaffected 6.6.39 through 6.6.*; unaffected 6.9.9 through 6.9.*; unaffected 6.10 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/0c97527e916054acc4a46ffb02842988acb2e92b
- https://git.kernel.org/stable/c/3ee21e14c8c329168a0b66bab00ecd18f5d0dee3
- https://git.kernel.org/stable/c/e809bc112712da8f7e15822674c6562da6cdf24c
- https://git.kernel.org/stable/c/efb905aeb44b0e99c0e6b07865b1885ae0471ebf
ADP enrichment
No English description supplied.
- https://git.kernel.org/stable/c/0c97527e916054acc4a46ffb02842988acb2e92b
- https://git.kernel.org/stable/c/3ee21e14c8c329168a0b66bab00ecd18f5d0dee3
- https://git.kernel.org/stable/c/e809bc112712da8f7e15822674c6562da6cdf24c
- https://git.kernel.org/stable/c/efb905aeb44b0e99c0e6b07865b1885ae0471ebf
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
No English description supplied.
No references supplied.