Fix CVE-2018-10124: kernel/signal kill_something_info() must handle INT_MIN safely #110
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Background
In kernel/signal.c, kill_something_info() could be triggered with an INT_MIN argument leading to incorrect handling and a local denial-of-service condition on kernels before 4.13; this is tracked as CVE-2018-10124.
Changes
Harden kill_something_info() argument handling to correctly process INT_MIN and avoid the DoS-triggering edge case.
Security Impact
Prevents a local DoS via the INT_MIN corner case in kill_something_info(), addressing CVE-2018-10124.
References
Upstream commit: 4ea77014af0d6205b05503d1c7aac6eace11d473; CVE: CVE-2018-10124