DragonFly commits List (threaded) for 2005-10
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cvs commit: src/sys/vm vm_fault.c
dillon 2005/10/24 13:02:09 PDT
DragonFly src repository
Modified files:
sys/vm vm_fault.c
Log:
Avoid a recursive kernel fault and subsequent double fault if the VM fault
code gets a KVM map_entry with a NULL object. Such entries exist in system
maps managed directly by the kernel, such as the buffer cache and kernel_map.
Instead, we check for the condition and panic immediately. Programs which
access /dev/[k]mem can hit this race/failure.
Reported-by: =?ISO-8859-1?Q?Stefan_Kr=FCger?= <skrueger@xxxxxxxxxxxxxxxx>
Revision Changes Path
1.19 +9 -0 src/sys/vm/vm_fault.c
http://www.dragonflybsd.org/cvsweb/src/sys/vm/vm_fault.c.diff?r1=1.18&r2=1.19&f=u
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