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Code Issues Releases Wiki Activity

objtool: Fix STACK_FRAME_NON_STANDARD reloc type 

STACK_FRAME_NON_STANDARD results in inconsistent relocation types
depending on .c or .S usage:

  Relocation section '.rela.discard.func_stack_frame_non_standard' at offset 0x3c01090 contains 5 entries:
  Offset             Info             Type               Symbol's Value  Symbol's Name + Addend
  0000000000000000  00020c2200000002 R_X86_64_PC32          0000000000047b40 do_suspend_lowlevel + 0
  0000000000000008  0002461e00000001 R_X86_64_64            00000000000480a0 machine_real_restart + 0
  0000000000000010  0000001400000001 R_X86_64_64            0000000000000000 .rodata + b3d4
  0000000000000018  0002444600000002 R_X86_64_PC32          00000000000678a0 __efi64_thunk + 0
  0000000000000020  0002659d00000001 R_X86_64_64            0000000000113160 __crash_kexec + 0

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220506121631.508692613@infradead.org
This commit is contained in:
Peter Zijlstra 2022-05-06 14:14:37 +02:00
parent 3ff5f78409
commit e2ef115813
2 changed files with 6 additions and 2 deletions
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4
include/linux/objtool.h
View File

@ -40,6 +40,8 @@ struct unwind_hint {
#ifdef CONFIG_STACK_VALIDATION
#include <asm/asm.h>
#ifndef __ASSEMBLY__
#define UNWIND_HINT(sp_reg, sp_offset, type, end) \
@ -137,7 +139,7 @@ struct unwind_hint {
.macro STACK_FRAME_NON_STANDARD func:req
.pushsection .discard.func_stack_frame_non_standard, "aw"
.long \func - .
_ASM_PTR \func
.popsection
.endm

4
tools/include/linux/objtool.h
View File

@ -40,6 +40,8 @@ struct unwind_hint {
#ifdef CONFIG_STACK_VALIDATION
#include <asm/asm.h>
#ifndef __ASSEMBLY__
#define UNWIND_HINT(sp_reg, sp_offset, type, end) \
@ -137,7 +139,7 @@ struct unwind_hint {
.macro STACK_FRAME_NON_STANDARD func:req
.pushsection .discard.func_stack_frame_non_standard, "aw"
.long \func - .
_ASM_PTR \func
.popsection
.endm