On Thu, Feb 07, 2019 at 10:53:13PM +1100, Michael Ellerman wrote: > Chandan reported that fstests' generic/026 test hit a crash:
> The instruction dump decodes as: > subfic r6,r5,8 > rlwinm r6,r6,3,0,28 > ldbrx r9,0,r3 > ldbrx r10,0,r4 <- > > Which shows us doing an 8 byte load from c00000062ac3fff9, which > crosses the page boundary at c00000062ac40000 and faults. > > It's not OK for memcmp to read past the end of the source or > destination buffers. It's not okay to access memory pages unsolicited. Reading past the end is fine per se. Segher
