[PATCH] arm64: __clear_user: handle exceptions on strb

Catalin Marinas catalin.marinas at arm.com
Thu Nov 13 07:06:25 PST 2014

On Wed, Nov 12, 2014 at 09:07:44PM +0000, Kyle McMartin wrote:
> ARM64 currently doesn't fix up faults on the single-byte (strb) case of
> __clear_user... which means that we can cause a nasty kernel panic as an
> ordinary user with any multiple PAGE_SIZE+1 read from /dev/zero.
> i.e.: dd if=/dev/zero of=foo ibs=1 count=1 (or ibs=65537, etc.)

Thanks for this, it's been like this for a while. Applied.


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