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authorPeter Maydell <peter.maydell@linaro.org>2014-05-15 14:40:23 +0100
committerRiku Voipio <riku.voipio@linaro.org>2014-06-17 09:21:41 +0300
commitbe3bd286bc06bb68cdc71748d9dd4edcd57b2b24 (patch)
tree8003dc4f8cdfed7de229c5d2e2843d72698c3027 /.gitmodules
parent4d13be8b8b817cbca7db2f880628d7ae5b74799f (diff)
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linux-user: Don't overrun guest buffer in sched_getaffinity
If the guest's "long" type is smaller than the host's, then our sched_getaffinity wrapper needs to round the buffer size up to a multiple of the host sizeof(long). This means that when we copy the data back from the host buffer to the guest's buffer there might be more than we can fit. Rather than overflowing the guest's buffer, handle this case by returning EINVAL or ignoring the unused extra space, as appropriate. Note that only guests using the syscall interface directly might run into this bug -- the glibc wrappers around it will always use a buffer whose size is a multiple of 8 regardless of guest architecture. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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