4.19-stable review patch. If anyone has any objections, please let me know.
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From: Guixiong Wei weiguixiong@bytedance.com
[ Upstream commit 76e9762d66373354b45c33b60e9a53ef2a3c5ff2 ]
Commit:
aaa8736370db ("x86, relocs: Ignore relocations in .notes section")
... only started ignoring the .notes sections in print_absolute_relocs(), but the same logic should also by applied in walk_relocs() to avoid such relocations.
[ mingo: Fixed various typos in the changelog, removed extra curly braces from the code. ]
Fixes: aaa8736370db ("x86, relocs: Ignore relocations in .notes section") Fixes: 5ead97c84fa7 ("xen: Core Xen implementation") Fixes: da1a679cde9b ("Add /sys/kernel/notes") Signed-off-by: Guixiong Wei weiguixiong@bytedance.com Signed-off-by: Ingo Molnar mingo@kernel.org Reviewed-by: Kees Cook keescook@chromium.org Link: https://lore.kernel.org/r/20240317150547.24910-1-weiguixiong@bytedance.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/x86/tools/relocs.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c index c7f1d1759c855..7470d88ae6311 100644 --- a/arch/x86/tools/relocs.c +++ b/arch/x86/tools/relocs.c @@ -672,6 +672,15 @@ static void walk_relocs(int (*process)(struct section *sec, Elf_Rel *rel, if (!(sec_applies->shdr.sh_flags & SHF_ALLOC)) { continue; } + + /* + * Do not perform relocations in .notes sections; any + * values there are meant for pre-boot consumption (e.g. + * startup_xen). + */ + if (sec_applies->shdr.sh_type == SHT_NOTE) + continue; + sh_symtab = sec_symtab->symtab; sym_strtab = sec_symtab->link->strtab; for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {