Hi Josh, On Thu, Jan 14, 2021 at 11:40 AM Josh Poimboeuf <jpoim...@redhat.com> wrote: > > Add support for proper vmlinux.o validation, which will be needed for > Sami's upcoming x86 LTO set. (And vmlinux validation is the future for > objtool anyway, for other reasons.) > > This isn't 100% done -- most notably, crypto still needs to be supported > -- but I think this gets us most of the way there. > > This can also be found at > > git://git.kernel.org/pub/scm/linux/kernel/git/jpoimboe/linux.git > objtool-vmlinux > > And for more testing it can be combined with Sami's x86 LTO patches: > > https://github.com/samitolvanen/linux clang-lto
Thank you for sending these! I applied this series on top of the clang-lto tree and built allyesconfig with LTO_CLANG enabled and the following crypto options disabled: CRYPTO_AES_NI_INTEL CRYPTO_CAMELLIA_AESNI_AVX2_X86_64 CRYPTO_SHA1_SSSE3 CRYPTO_SHA256_SSSE3 CRYPTO_SHA512_SSSE3 CRYPTO_CRC32C_INTEL I can confirm that all the warnings I previously saw are now fixed, but I'm seeing a few new ones: vmlinux.o: warning: objtool: balance_leaf_when_delete()+0x17d4: stack state mismatch: cfa1=7+192 cfa2=7+176 vmlinux.o: warning: objtool: internal_move_pointers_items()+0x9f7: stack state mismatch: cfa1=7+160 cfa2=7+176 vmlinux.o: warning: objtool: strncpy_from_user()+0x181: call to do_strncpy_from_user() with UACCESS enabled vmlinux.o: warning: objtool: strnlen_user()+0x12b: call to do_strnlen_user() with UACCESS enabled vmlinux.o: warning: objtool: i915_gem_execbuffer2_ioctl()+0x390: call to __ubsan_handle_negate_overflow() with UACCESS enabled vmlinux.o: warning: objtool: .text.snd_trident_free_voice: unexpected end of section I haven't had a chance to take a closer look yet, but some of these are probably related to https://github.com/ClangBuiltLinux/linux/issues/1192. However, I can reproduce these also with ToT Clang, not just with Clang 11. Sami
