LoongArch: BPF: Zero-extend signed ALU32 div/mod results
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.12.114, 6.18.57, 7.1.6
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
In the Linux kernel, the following vulnerability has been resolved: LoongArch: BPF: Zero-extend signed ALU32 div/mod results ALU32 operations write a 32-bit result and leave the upper 32 bits of the BPF register zero. The LoongArch JIT sign-extends the result of signed ALU32 BPF_DIV and BPF_MOD (off=1), so a negative 32-bit quotient or remainder leaves bits 63:32 set in JITted code while the verifier and interpreter model those bits as zero. Keep sign-extension on the operands, which signed divide needs, and zero-extend the ALU32 result after the divide or modulo instruction, matching the unsigned ALU32 div/mod paths and every other ALU32 operation in this JIT.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From 2425c9e002d2a1fdca34261b2fa6713eafef2163 · fixed in 7577cca85f2d4590c9d9423ba72ef54181a713c9; From 2425c9e002d2a1fdca34261b2fa6713eafef2163 · fixed in 16656c3d734693be3d8a36dbf9d09142b69f3ddc; From 2425c9e002d2a1fdca34261b2fa6713eafef2163 · fixed in 716cb29dbed4d62e9e108950a1a82bcba4cc2d45; From 2425c9e002d2a1fdca34261b2fa6713eafef2163 · fixed in dacd348b8a993373576fe2ee2d8b114740ba57a6
- Linux Linux
6.7
- KernelLinux
From 6.7.0 · fixed in 6.12.114; From 6.13.0 · fixed in 6.18.57; From 6.19.0 · fixed in 7.1.6