https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89014
--- Comment #9 from Wilco <wilco at gcc dot gnu.org> --- Author: wilco Date: Fri Nov 29 17:22:30 2019 New Revision: 278854 URL: https://gcc.gnu.org/viewcvs?rev=278854&root=gcc&view=rev Log: aarch64: fix use-after-free in -march=native (PR driver/89014) Running: $ valgrind ./xgcc -B. -c test.c -march=native on aarch64 shows a use-after-free in host_detect_local_cpu due to the std::string result of aarch64_get_extension_string_for_isa_flags only living until immediately after a c_str call. This leads to corrupt "-march=" values being passed to cc1. This patch fixes the use-after-free, though it appears to also need Tamar's patch here: https://gcc.gnu.org/ml/gcc-patches/2018-12/msg01302.html in order to generate valid values for cc1. This may have worked by accident in the past, if the corrupt "-march=" value happened to be 0-terminated in the "right" place; with this patch it now appears to reliably break without Tamar's patch. Backport from mainline 2019-01-23 David Malcolm <dmalc...@redhat.com> PR driver/89014 * config/aarch64/driver-aarch64.c (host_detect_local_cpu): Fix use-after-free of the result of aarch64_get_extension_string_for_isa_flags. Modified: branches/gcc-8-branch/gcc/ChangeLog branches/gcc-8-branch/gcc/config/aarch64/driver-aarch64.c
