Where does user_path_walk() live?

[kevin conaway]

I am a student doing an independent study on
filesystem security and I was trying to pin down
exactly where a users permissions are checked when
trying to access a particular file.  Looking through
the various system calls in /usr/src/linux/fs/open.c
tells me that each call that requires a permission
check calls user_path_walk() to essentially "walk"
through the parts of the path to make sure the sure
has access to each part.  I attempted to find the code
for user_path_walk() but all I could find was a
#define statement that showed user_path_walk was
really a macro for __user_walk().  All I could find
were symbol references for __user_walk() in the kernel
tree.  Does anyone know where this code lives?

Thanks

Kevin Conaway

__________________________________
Do you Yahoo!?
The New Yahoo! Shopping - with improved product search
http://shopping.yahoo.com
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/