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x86/unwind: Prevent KASAN false positive warnings in guess unwinder
The guess unwinder scans the entire stack, which can cause KASAN "stack-out-of-bounds" false positive warnings. Tell KASAN to ignore it. Reported-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Stephane Eranian <eranian@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Cc: davej@codemonkey.org.uk Cc: dvyukov@google.com Link: http://lkml.kernel.org/r/61939c0b2b2d63ce97ba59cba3b00fd47c2962cf.1479398226.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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1 changed files with 6 additions and 2 deletions
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@ -7,11 +7,13 @@
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unsigned long unwind_get_return_address(struct unwind_state *state)
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{
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unsigned long addr = READ_ONCE_NOCHECK(*state->sp);
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if (unwind_done(state))
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return 0;
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return ftrace_graph_ret_addr(state->task, &state->graph_idx,
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*state->sp, state->sp);
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addr, state->sp);
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}
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EXPORT_SYMBOL_GPL(unwind_get_return_address);
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@ -23,8 +25,10 @@ bool unwind_next_frame(struct unwind_state *state)
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return false;
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do {
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unsigned long addr = READ_ONCE_NOCHECK(*state->sp);
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for (state->sp++; state->sp < info->end; state->sp++)
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if (__kernel_text_address(*state->sp))
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if (__kernel_text_address(addr))
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return true;
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state->sp = info->next_sp;
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