On Sun, 1 Apr 2007, Robert Watson wrote:
On Thu, 29 Mar 2007, Julian Elischer wrote:
julian 2007-03-29 02:11:46 UTC
FreeBSD src repository
Modified files:
sys/compat/linux linux_file.c linux_util.h
sys/i386/linux linux.h linux_dummy.c linux_proto.h
linux_syscall.h linux_sysent.c
syscalls.master
sys/amd64/linux32 linux.h linux32_dummy.c linux32_proto.h
linux32_syscall.h linux32_sysent.c
syscalls.master
Log:
Implement the openat() linux syscall
Submitted by: Roman Divacky (rdivacky@)
MFC after: 2 weeks
The locking and reference counting in this patch is highly dubious; also,
vn_fullpath() should really not be used this way, as it fails whenever
vnodes fall out of the name cache or a file system doesn't use the namecache
(i.e., it is purely advisory). If we're going to do openat() in the Linux
emulation layer, let's instead implement it properly in the FreeBSD system
call code as a first class service and then wrap it the way we wrap other
system calls. Please do not MFC this patch as-is.
Looking at the code again, there's another serious bug in it: linux_at() fails
to validate that the passed file descriptor is actually a vnode file
descriptor type before dereferencing its f_vnode field and treating it as a
vnode.
Robert N M Watson
Computer Laboratory
University of Cambridge
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