Messages in this thread | | | Date | Mon, 14 Apr 2008 22:34:34 +0400 | From | Alexey Dobriyan <> | Subject | Re: file offset corruption on 32-bit machines? |
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On Mon, Apr 14, 2008 at 05:54:52PM +0100, Alan Cox wrote: > > Well, but imagine you have a file /proc/my_secret_file from which you > > are able to read from position A:a and B:b but not from position > > A:b. Concievably, checks for the file position could be bypassed because of > > this race... I know this is kind of dumb example but I can imagine someone > > Unlikely as the ppos passed to the driver is a private copy and the user > could equally use pread/pwrite to specify that offset.
pread is banned on proc files implemented via seq_files. And in no-seq_file case, there are MAX_NON_LFS checks which fits into 32 bits.
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