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x86, relocs: Add more per-cpu gold special cases
The "gold" linker doesn't seem to put some additional per-cpu cases in the right place. Add these to the per-cpu check. Without this, the kASLR patch series fails to correctly apply relocations, and fails to boot. Signed-off-by: Michael Davidson <md@google.com> Signed-off-by: Kees Cook <keescook@chromium.org> Link: http://lkml.kernel.org/r/20131011013954.GA28902@www.outflux.net Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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@ -722,15 +722,23 @@ static void percpu_init(void)
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/*
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* Check to see if a symbol lies in the .data..percpu section.
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* For some as yet not understood reason the "__init_begin"
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* symbol which immediately preceeds the .data..percpu section
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* also shows up as it it were part of it so we do an explict
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* check for that symbol name and ignore it.
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*
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* The linker incorrectly associates some symbols with the
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* .data..percpu section so we also need to check the symbol
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* name to make sure that we classify the symbol correctly.
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*
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* The GNU linker incorrectly associates:
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* __init_begin
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*
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* The "gold" linker incorrectly associates:
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* init_per_cpu__irq_stack_union
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* init_per_cpu__gdt_page
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*/
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static int is_percpu_sym(ElfW(Sym) *sym, const char *symname)
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{
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return (sym->st_shndx == per_cpu_shndx) &&
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strcmp(symname, "__init_begin");
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strcmp(symname, "__init_begin") &&
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strncmp(symname, "init_per_cpu_", 13);
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}
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