Hello,
Since the kernel 2.6.10 the rw_verify_area checks if the position in
the file is not a negative value.
When I try to read by /dev/kmem a virtual memory address (which can
be negative) I have a problem because the rw_verify_area failed.
I modified the code to do the check only if we try to read a filed
other than /dev/kmem (major=1, minor=2) and it's work.
Why this check has been added ? Is it possible to detect that the
file can be read virtual memory address which can be negative ?
My first fix is
if (!(imajor(inode) == 1 && iminor(inode) == 2))
{
if (unlikely((pos < 0) || (loff_t) (pos + count) < 0))
goto Einval;
}
Is it a better way to do this ?
Thanks
Jean-Bernard DAMIANO
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