On Thu, Apr 28, 2016 at 2:58 PM, Russell King <rmk+kernel at arm.linux.org.uk> wrote: > Ensure that user memory sizes do not wrap around when validating the > user input, which can lead to the following input validation working > incorrectly. > > Signed-off-by: Russell King <rmk+kernel at arm.linux.org.uk> > --- > kernel/kexec_core.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c > index 8d34308ea449..d719a4d0ef55 100644 > --- a/kernel/kexec_core.c > +++ b/kernel/kexec_core.c > @@ -169,6 +169,8 @@ int sanity_check_segment_list(struct kimage *image) > > mstart = image->segment[i].mem; > mend = mstart + image->segment[i].memsz; > + if (mstart > mend) > + return result; > if ((mstart & ~PAGE_MASK) || (mend & ~PAGE_MASK)) > return result; > if (mend >= KEXEC_DESTINATION_MEMORY_LIMIT) Reviewed-by: Pratyush Anand <panand at redhat.com>
