diff options
| author | Michael Davidson <md@google.com> | 2013-10-10 18:39:54 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2013-10-13 03:11:57 -0700 |
| commit | d751c169e9a6f0f853346f1184881422bd10b3c2 (patch) | |
| tree | 5accc76adaa004d6a7cbdd8d6efd2474fb3267eb /arch/x86 | |
| parent | d0e639c9e06d44e713170031fe05fb60ebe680af (diff) | |
| download | linux-d751c169e9a6f0f853346f1184881422bd10b3c2.tar.bz2 | |
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>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/tools/relocs.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c index f7bab68a4b83..71a2533c90d3 100644 --- a/arch/x86/tools/relocs.c +++ b/arch/x86/tools/relocs.c @@ -722,15 +722,23 @@ static void percpu_init(void) /* * Check to see if a symbol lies in the .data..percpu section. - * For some as yet not understood reason the "__init_begin" - * symbol which immediately preceeds the .data..percpu section - * also shows up as it it were part of it so we do an explict - * check for that symbol name and ignore it. + * + * The linker incorrectly associates some symbols with the + * .data..percpu section so we also need to check the symbol + * name to make sure that we classify the symbol correctly. + * + * The GNU linker incorrectly associates: + * __init_begin + * + * The "gold" linker incorrectly associates: + * init_per_cpu__irq_stack_union + * init_per_cpu__gdt_page */ static int is_percpu_sym(ElfW(Sym) *sym, const char *symname) { return (sym->st_shndx == per_cpu_shndx) && - strcmp(symname, "__init_begin"); + strcmp(symname, "__init_begin") && + strncmp(symname, "init_per_cpu_", 13); } |