kevin/linux
1
Fork 0
Code

lkdtm: Disable CFI checking for perms functions

Browse Source 
The EXEC_RODATA test plays a lot of tricks to live in the .rodata section,
and once again ran into objtool's (completely reasonable) assumptions
that executable code should live in an executable section. However, this
manifested only under CONFIG_CFI_CLANG=y, as one of the .cfi_sites was
pointing into the .rodata section.

Since we're testing non-CFI execution properties in perms.c (and
rodata.c), we can disable CFI for the involved functions, and remove the
CFI arguments from rodata.c entirely.

Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202308301532.d7acf63e-oliver.sang@intel.com
Fixes: 6342a20efb ("objtool: Add elf_create_section_pair()")
Link: https://lore.kernel.org/r/20240430234953.work.760-kees@kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook 2024-04-30 16:49:57 -07:00
parent 26f812ba75
commit fb28a8862d
2 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/misc/lkdtm/Makefile
View File

@ -19,7 +19,7 @@ KASAN_SANITIZE_rodata.o := n
KCSAN_SANITIZE_rodata.o := n
KCOV_INSTRUMENT_rodata.o := n
OBJECT_FILES_NON_STANDARD_rodata.o := y
CFLAGS_REMOVE_rodata.o += $(CC_FLAGS_LTO) $(RETHUNK_CFLAGS)
CFLAGS_REMOVE_rodata.o += $(CC_FLAGS_LTO) $(RETHUNK_CFLAGS) $(CC_FLAGS_CFI)
OBJCOPYFLAGS :=
OBJCOPYFLAGS_rodata_objcopy.o := \

2
drivers/misc/lkdtm/perms.c
View File

@ -61,7 +61,7 @@ static void *setup_function_descriptor(func_desc_t *fdesc, void *dst)
return fdesc;
}
static noinline void execute_location(void *dst, bool write)
static noinline __nocfi void execute_location(void *dst, bool write)
{
void (*func)(void);
func_desc_t fdesc;