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x86/relocs: Add percpu fixup for GNU ld 2.23

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The GNU linker tries to put __per_cpu_load into the percpu area,
resulting in a lack of its relocation. Force this symbol to be
relocated. Seen starting with GNU ld 2.23 and later.

Reported-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Michael Davidson <md@google.com>
Cc: Cong Ding <dinggnu@gmail.com>
Link: http://lkml.kernel.org/r/20131016064314.GA2739@www.outflux.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Kees Cook 2013-10-15 23:43:14 -07:00 committed by Ingo Molnar
parent 6e6a4932b0
commit aec58bafaf
1 changed files with 2 additions and 0 deletions
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2
arch/x86/tools/relocs.c
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@ -729,6 +729,7 @@ static void percpu_init(void)
* *
* The GNU linker incorrectly associates: * The GNU linker incorrectly associates:
* __init_begin * __init_begin
* __per_cpu_load
* *
* The "gold" linker incorrectly associates: * The "gold" linker incorrectly associates:
* init_per_cpu__irq_stack_union * init_per_cpu__irq_stack_union
@ -738,6 +739,7 @@ static int is_percpu_sym(ElfW(Sym) *sym, const char *symname)
{ {
return (sym->st_shndx == per_cpu_shndx) && return (sym->st_shndx == per_cpu_shndx) &&
strcmp(symname, "__init_begin") && strcmp(symname, "__init_begin") &&
strcmp(symname, "__per_cpu_load") &&
strncmp(symname, "init_per_cpu_", 13); strncmp(symname, "init_per_cpu_", 13);
} }