Messages in this thread | | | From | Marco Elver <> | Date | Wed, 3 Jun 2020 14:08:57 +0200 | Subject | Re: [PATCH 0/9] x86/entry fixes |
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On Wed, 3 Jun 2020 at 14:08, Peter Zijlstra <peterz@infradead.org> wrote: > > On Wed, Jun 03, 2020 at 02:00:37PM +0200, Peter Zijlstra wrote: > > On Wed, Jun 03, 2020 at 01:40:14PM +0200, Peter Zijlstra wrote: > > > The first patch is a fix for x86/entry, I'm quicky runing out of brown paper bags again :/ > > > > > > The rest goes on top of these: > > > > > > https://lkml.kernel.org/r/20200602173103.931412766@infradead.org > > > https://lkml.kernel.org/r/20200602184409.22142-1-elver@google.com > > > > > > patches from myself and Marco that enable *SAN builds. So far GCC-KASAN seen to > > > behave quite well, I've yet to try UBSAN. > > > > GCC10 + UBSAN: > > > > vmlinux.o: warning: objtool: match_held_lock()+0x1b2: call to __ubsan_handle_type_mismatch_v1() leaves .noinstr.text section > > vmlinux.o: warning: objtool: rcu_nmi_enter()+0x234: call to __ubsan_handle_out_of_bounds() leaves .noinstr.text section > > vmlinux.o: warning: objtool: __rcu_is_watching()+0x59: call to __ubsan_handle_out_of_bounds() leaves .noinstr.text section > > > > All of them are marked noinstr. So I suppose UBSAN is just buggered in > > GCC :-/ > > CLANG11 + UBSAN: > > vmlinux.o: warning: objtool: exc_nmi()+0x1c3: call to __ubsan_handle_load_invalid_value() leaves .noinstr.text section > vmlinux.o: warning: objtool: poke_int3_handler()+0x72: call to __ubsan_handle_load_invalid_value() leaves .noinstr.text section > vmlinux.o: warning: objtool: mce_check_crashing_cpu()+0x71: call to __ubsan_handle_load_invalid_value() leaves .noinstr.text section > vmlinux.o: warning: objtool: lock_is_held_type()+0x95: call to __ubsan_handle_out_of_bounds() leaves .noinstr.text section > vmlinux.o: warning: objtool: rcu_nmi_enter()+0xba: call to __ubsan_handle_out_of_bounds() leaves .noinstr.text section > vmlinux.o: warning: objtool: __rcu_is_watching()+0x2c: call to __ubsan_handle_out_of_bounds() leaves .noinstr.text section > > IOW, UBSAN appears to be completely hosed.
What is the .config you used? I somehow can't reproduce. I've applied the patches on top of -tip/master.
Thanks, -- Marco
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