Date: Fri, 28 Oct 2005 15:46:18 -0400 From: Kris Kennaway <kris@obsecurity.org> To: current@FreeBSD.org Cc: kan@FreeBSD.org, jroberson@chesapeake.net, ssouhlal@FreeBSD.org Subject: Null pointer deref in getdirentries() Message-ID: <20051028194618.GA21699@xor.obsecurity.org>
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UP machine running 6.0. This machine does lots of unmounting, so it's
possible rm raced with the umount.
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x7b
fault code = supervisor read, page not present
instruction pointer = 0x20:0xc055d705
stack pointer = 0x28:0xe766bc3c
frame pointer = 0x28:0xe766bcd4
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 59277 (rm)
db> wh
Tracing pid 59277 tid 100059 td 0xc6201180
getdirentries(c6201180,e766bd04,10,418,4) at getdirentries+0x75
syscall(c068003b,3b,3b,8050000,805a300) at syscall+0x2c0
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (196, FreeBSD ELF32, getdirentries), eip = 0x280bec6f, esp = 0xbfbfeb6c, ebp = 0xbfbfeb98 ---
Core available.
Kris
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