Messages in this thread | | | From | David Woodhouse <> | Subject | Re: 2.5.55-rmk1: user space lossage | Date | Thu, 23 Jan 2003 09:48:23 +0000 |
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< Snip long thread about init segfaulting immediately at boot on 2.5.55 >
ch@murgatroid.com said: > I just dropped jffs2 from 2.5.52 into 2.5.55 and it works, too.
ch@murgatroid.com said: > Aha! This is the problem: > - .mmap = generic_file_mmap, > + .mmap = generic_file_readonly_mmap, > If you reverese this change, 2.5.55-rmk1 behaves.
Er, yes. generic_file_readonly_mmap() silently removed the VM_MAYWRITE bit from vma->vm_flags when init made a _PRIVATE_ writable mapping, apparently on the basis that we have no writepage().
Then we return success anyway.
Then init segfaults when it touches something in that mapping.
/me blames akpm. :)
-- dwmw2
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