drm/amdkfd: Avoid integer underflow in EOP ring size calculation.
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 in EOP ring size calculation. The low 6 bits of cp_hqd_eop_control store the base-2 logarithm of the EOP ring size. This was calculated as order_base_2(q->eop_ring_buffer_size / 4) - 1 But order_base_2 can in theory return 0, so this could underflow (although in practice the ring buffer size cannot be less than 4096). Change this to order_base_2(q->eop_ring_buffer_size / 8) using properties of logarithms. Also add to the above comment to make the mathematics more clear. (cherry picked from commit f0f43fcf8b2b3a924cad9444340921c96ed5f634)
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From d696d536f0a97ac779d6176107ac4e96d0a2f8b9 · fixed in 287a34c4d712e0bdb67751e21316d9c8d75a528a; From d696d536f0a97ac779d6176107ac4e96d0a2f8b9 · fixed in 8ee521b8b189799e361d4233c5180ba56656d4d4
- Linux Linux
4.3
- KernelLinux
From 4.3.0 · fixed in 7.2.8