CVE-2024-35841: net: tls, fix WARNIING in __sk_msg_free
First published: Fri May 17 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: net: tls, fix WARNIING in __sk_msg_free A splice with MSG_SPLICE_PAGES will cause tls code to use the tls_sw_sendmsg_splice path in the TLS sendmsg code to move the user provided pages from the msg into the msg_pl. This will loop over the msg until msg_pl is full, checked by sk_msg_full(msg_pl). The user can also set the MORE flag to hint stack to delay sending until receiving more pages and ideally a full buffer. If the user adds more pages to the msg than can fit in the msg_pl scatterlist (MAX_MSG_FRAGS) we should ignore the MORE flag and send the buffer anyways. What actually happens though is we abort the msg to msg_pl scatterlist setup and then because we forget to set 'full record' indicating we can no longer consume data without a send we fallthrough to the 'continue' path which will check if msg_data_left(msg) has more bytes to send and then attempts to fit them in the already full msg_pl. Then next iteration of sender doing send will encounter a full msg_pl and throw the warning in the syzbot report. To fix simply check if we have a full_record in splice code path and if not send the msg regardless of MORE flag.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.119-1 6.12.11-1 6.12.12-1 |
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Reference Links
- https://git.kernel.org/stable/c/02e368eb1444a4af649b73cbe2edd51780511d86
- https://git.kernel.org/stable/c/294e7ea85f34748f04e5f3f9dba6f6b911d31aa8
- https://git.kernel.org/stable/c/dc9dfc8dc629e42f2234e3327b75324ffc752bc9
- https://launchpad.net/bugs/cve/CVE-2024-35841
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-35841
- https://nvd.nist.gov/vuln/detail/CVE-2024-35841
- https://security-tracker.debian.org/tracker/CVE-2024-35841
- https://ubuntu.com/security/CVE-2024-35841
- https://git.kernel.org/linus/dc9dfc8dc629e42f2234e3327b75324ffc752bc9
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