Linux Kernel ftrace Division by Zero Vulnerability in function_stat_show

A vulnerability in the Linux kernel's ftrace component could lead to a division by zero error in the function_stat_show() routine. This issue arises when the denominator, calculated as x * (x - 1) * 1000 modulo {2^32, 2^64}, equals zero, causing the standard deviation computation to be skipped. The vulnerability does not currently account for potential overflows in the 'counter' field of the 'rec' structure, as an overflow in the 'time' field is expected to occur first.

Impact

Exploitation of this vulnerability could lead to a denial of service condition by causing a division by zero error, which typically results in a crash or unintended behavior of the affected component.