Vulnerability CVE-2021-46940
Published: 2024-02-27

Description:
In the Linux kernel, the following vulnerability has been resolved:

tools/power turbostat: Fix offset overflow issue in index converting

The idx_to_offset() function returns type int (32-bit signed), but
MSR_PKG_ENERGY_STAT is u32 and would be interpreted as a negative number.
The end result is that it hits the if (offset < 0) check in update_msr_sum()
which prevents the timer callback from updating the stat in the background when
long durations are used. The similar issue exists in offset_to_idx() and
update_msr_sum(). Fix this issue by converting the 'int' to 'off_t' accordingly.

 References:
https://git.kernel.org/stable/c/ea6803ff2cd1a2d7d880256bf562172b708a76ff
https://git.kernel.org/stable/c/dbdf22fc825fdb1d97f23230064e0f9819471628
https://git.kernel.org/stable/c/337b1546cde87fb8588ddaedf0201b769baa572a
https://git.kernel.org/stable/c/13a779de4175df602366d129e41782ad7168cef0
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