drm/amdkfd: Avoid integer underflow with ffs in EOP ring size calc
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 7.2.8
- 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: drm/amdkfd: Avoid integer underflow with ffs in EOP ring size calc The low 6 bits of cp_hqd_eop_control store the base-2 logarithm of the EOP ring size. This was calculated as ffs(q->eop_ring_buffer_size / sizeof(unsigned int)) - 1 - 1 But ffs can in theory return 1 or 0, so this could underflow (although in practice the ring buffer size cannot be less than 4096). Change this to ffs(q->eop_ring_buffer_size / sizeof(unsigned int) / 4) using properties of logarithms. (cherry picked from commit 4f18c56630383c14bfc6b2d65f88f2f895d2121a)
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From 14328aa58ce523a59996c5a82681c43ec048cc33 · fixed in 82e1b8299c6da02ce02185c208d2fdf7572b5ea1; From 14328aa58ce523a59996c5a82681c43ec048cc33 · fixed in c883d0a132d430ef7ebb23fd94323be94d0fbdb8
- Linux Linux
5.3
- KernelLinux
From 5.3.0 · fixed in 7.2.8