[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-1.0-425-g63db23d

[jistone at sourceware dot org]

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commit 63db23df87bf6408c0947053288b771d863ecf36
Author: Josh Stone <jistone@redhat.com>
Date:   Mon Dec 21 18:26:47 2009 -0800

    PR11112: Check the full %m/M buffer, and limit the length
    
    We already had code in place to try a deref on the requested memory
    buffer, but it was missing the static-precision case.  Thus, it was
    possible to craft an address that would pass the check on the first byte
    but would pagefault at the end of the buffer.
    
    While we're at it, we should also be limiting the number of bytes in
    such a read, so even legitimately-huge buffers won't chew up kernel
    time.  I've arbitrarily chosen 1024 as the limit, but we can revisit
    that later. (see also PR10490)
    
    TODO: we need a reliable testcase where a starting address is valid but
    the end address is bogus.  In PR11112, the reproducer was using a huge
    precision to run off the heap, but we need something that will
    consistently work even with <1024 length.

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Summary of changes:
 translate.cxx |   39 ++++++++++++++++++++++++++-------------
 1 files changed, 26 insertions(+), 13 deletions(-)


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systemtap: system-wide probe/trace tool