https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220074
Bug ID: 220074
Summary: [kern] sys/kern/kern_prot.c: a sleep-under-mutex bug
in crextend
Product: Base System
Version: 11.0-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
The kernel may sleep under a mutex, and the function call path in file
"sys/kern/kern_prot.c" is:
sys_setuid [line 502: acquire the mutex]
crcopysafe [line 506]
crcopy [line 1991]
crsetgroups [line 1892]
crextend [line 2081]
malloc(M_WAITOK) [line 2032] --> may sleep
The possible fix of this bug is to replace "M_WAITOK" in malloc with
"M_NOWAIT".
This bug is found by a static analysis tool written by myself, and it is
checked by my review of the FreeBSD code.
Jia-Ju Bai
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