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authorWill Deacon <will.deacon@arm.com>2012-07-23 14:18:13 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-07-31 12:04:47 +0100
commitb74253f78400f9a4b42da84bb1de7540b88ce7c4 (patch)
tree27a91700b0dafa9119ed774ad29f481152491ead /net
parent15ac49b65024f55c4371a53214879a9c77c4fbf9 (diff)
ARM: 7479/1: mm: avoid NULL dereference when flushing gate_vma with VIVT caches
The vivt_flush_cache_{range,page} functions check that the mm_struct of the VMA being flushed has been active on the current CPU before performing the cache maintenance. The gate_vma has a NULL mm_struct pointer and, as such, will cause a kernel fault if we try to flush it with the above operations. This happens during ELF core dumps, which include the gate_vma as it may be useful for debugging purposes. This patch adds checks to the VIVT cache flushing functions so that VMAs with a NULL mm_struct are flushed unconditionally (the vectors page may be dirty if we use it to store the current TLS pointer). Cc: <stable@vger.kernel.org> # 3.4+ Reported-by: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org> Tested-by: Uros Bizjak <ubizjak@gmail.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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