Overview
About vulnerability
In the Linux kernel, the following vulnerability has been resolved:
accel/ivpu: Reject firmware log with size smaller than header
fw_log_from_bo() validates the tracing buffer header_size and that the log fits within the BO, but never checks that log->size is at least log->header_size. fw_log_print_buffer() then computes:
u32 data_size = log->size - log->header_size;
which underflows to a near-U32_MAX value when firmware reports a log whose size is smaller than its header. That huge data_size defeats the log_start/log_end bounds clamps added by commit dd1311bcf0e6 (“accel/ivpu: Add bounds checks for firmware log indices”), so fw_log_print_lines() reads far past the small real data region of the BO. A size of 0 also makes fw_log_from_bo() advance the offset by 0, causing the callers to loop forever on the same header.
Reject logs whose size is smaller than the header (which also rejects size == 0).
Details
- Affected product:
- Debian 10 ELS
- Affected packages:
- linux @ 4.19.0