CVE-2024-42136: cdrom: rearrange last_media_change check to avoid unintentional overflow
First published: Tue Jul 30 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <6.1.98 | |
| Linux Linux kernel | >=6.2<6.6.39 | |
| Linux Linux kernel | >=6.7<6.9.9 | |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.115-1 6.1.112-1 6.11.7-1 6.11.9-1 |
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Reference Links
- 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://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-42136
- https://nvd.nist.gov/vuln/detail/CVE-2024-42136
- https://launchpad.net/bugs/cve/CVE-2024-42136
- https://security-tracker.debian.org/tracker/CVE-2024-42136
- https://ubuntu.com/security/CVE-2024-42136
- https://git.kernel.org/linus/efb905aeb44b0e99c0e6b07865b1885ae0471ebf
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