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    SubjectRe: [PATCH 00/10] AXFS: Advanced XIP filesystem
    Date
    On Friday 22 August 2008, Geert Uytterhoeven wrote:
    > I gave AxFS a try on PS3 (ppc64, always use big-endian 64-bit for testing new
    > code ;-).
    > When mounting the image, I got the crash below:
    >
    > | attempt to access beyond end of device
    > | loop0: rw=0, want=4920, limit=4912
    > | Unable to handle kernel paging request for data at address 0x00000028


    Offset 0x28 is buffer_head->b_data, so it seems like sb_bread returns NULL,
    which it does for out of range block numbers. I guess axfs_copy_block
    should check for that condition, as it can happen on malicious file system
    images.
    I agree that this is likely to get caused by an endianess bug.
    A good help for finding endianess bugs is to use __be64 like data types
    everywhere and test with sparse -D__CHECK_ENDIAN__.

    Arnd


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