On Jul 30 2017, Jeff Law <l...@redhat.com> wrote: > This patch introduces generic mechanisms to protect the dynamically > allocated stack space against stack-clash attacks. > > Changes since V2: > > Dynamic allocations can be emitted as unrolled inlined probes or with a > rotated loop. Blockage insns are also properly emitted for the dynamic > area probes and the dynamic area probing now supports targets that may > make optimistic assumptions in their prologues. Finally it uses the new > param to control the probing interval. > > Tests were updated to explicitly specify the guard and probing interval. > New test to check inline/unrolled probes as well as rotated loop.
Does that work correctly when the VLA is smaller than the probe size (word_mode by default)? I see a failure in glibc on armv7 where ldconfig is using a zero-size VLA, which is invalid in C, but it could also end up using a VLA of size 1. Andreas. -- Andreas Schwab, SUSE Labs, sch...@suse.de GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7 "And now for something completely different."
