Currently we support only relocations of type ELF64_R_TYPE or ELF32_R_TYPE.
We should be warned if other relocation types appear in the relocation
sections.
This type of message has helped to identify code overwriting a relocation
section before relocation and incorrect parsing of relocation tables.
Signed-off-by: Heinrich Schuchardt <xypron.g...@gmx.de>
---
arch/x86/lib/relocate.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/arch/x86/lib/relocate.c b/arch/x86/lib/relocate.c
index ed10755d9c..01e619d20b 100644
--- a/arch/x86/lib/relocate.c
+++ b/arch/x86/lib/relocate.c
@@ -53,6 +53,15 @@ static void do_elf_reloc_fixups64(unsigned int text_base,
uintptr_t size,
Elf64_Addr *offset_ptr_ram;
do {
+ unsigned long long type = ELF64_R_TYPE(re_src->r_info);
+
+ if (type != R_X86_64_RELATIVE) {
+ printf("%s: unsupported relocation type 0x%llx "
+ "at %p, ",__func__, type, re_src);
+ printf("offset = 0x%llx\n", re_src->r_offset);
+ continue;
+ }
+
/* Get the location from the relocation entry */
offset_ptr_rom = (Elf64_Addr *)(uintptr_t)re_src->r_offset;
@@ -91,6 +100,15 @@ static void do_elf_reloc_fixups32(unsigned int text_base,
uintptr_t size,
Elf32_Addr *offset_ptr_ram;
do {
+ unsigned int type = ELF32_R_TYPE(re_src->r_info);
+
+ if (type != R_386_RELATIVE) {
+ printf("%s: unsupported relocation type 0x%x "
+ "at %p, ",__func__, type, re_src);
+ printf("offset = 0x%x\n", re_src->r_offset);
+ continue;
+ }
+
/* Get the location from the relocation entry */
offset_ptr_rom = (Elf32_Addr *)(uintptr_t)re_src->r_offset;
--
2.19.1
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