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| author | Josh Poimboeuf <jpoimboe@kernel.org> | 2022-07-18 07:50:25 -0700 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-07-20 19:24:53 +0200 |
| commit | efc72a665a61fd48c462f5248a9e3dc991398ddd (patch) | |
| tree | 5d72b6dce6d4a86951a07659455d3ef508d07d89 | |
| parent | eb23b5ef9131e6d65011de349a4d25ef1b3d4314 (diff) | |
| download | linux-gpio-intel-efc72a665a61fd48c462f5248a9e3dc991398ddd.tar.gz | |
lkdtm: Disable return thunks in rodata.c
The following warning was seen:
WARNING: CPU: 0 PID: 0 at arch/x86/kernel/alternative.c:557 apply_returns (arch/x86/kernel/alternative.c:557 (discriminator 1))
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-rc4-00008-gee88d363d156 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-debian-1.16.0-4 04/01/2014
RIP: 0010:apply_returns (arch/x86/kernel/alternative.c:557 (discriminator 1))
Code: ff ff 74 cb 48 83 c5 04 49 39 ee 0f 87 81 fe ff ff e9 22 ff ff ff 0f 0b 48 83 c5 04 49 39 ee 0f 87 6d fe ff ff e9 0e ff ff ff <0f> 0b 48 83 c5 04 49 39 ee 0f 87 59 fe ff ff e9 fa fe ff ff 48 89
The warning happened when apply_returns() failed to convert "JMP
__x86_return_thunk" to RET. It was instead a JMP to nowhere, due to the
thunk relocation not getting resolved.
That rodata.o code is objcopy'd to .rodata, and later memcpy'd, so
relocations don't work (and are apparently silently ignored).
LKDTM is only used for testing, so the naked RET should be fine. So
just disable return thunks for that file.
While at it, disable objtool and KCSAN for the file.
Fixes: 0b53c374b9ef ("x86/retpoline: Use -mfunction-return")
Reported-by: kernel test robot <oliver.sang@intel.com>
Debugged-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/lkml/Ys58BxHxoDZ7rfpr@xsang-OptiPlex-9020/
| -rw-r--r-- | arch/x86/Makefile | 1 | ||||
| -rw-r--r-- | drivers/misc/lkdtm/Makefile | 9 |
2 files changed, 7 insertions, 3 deletions
diff --git a/arch/x86/Makefile b/arch/x86/Makefile index 1f40dad30d508..7854685c5f25b 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -27,6 +27,7 @@ RETHUNK_CFLAGS := -mfunction-return=thunk-extern RETPOLINE_CFLAGS += $(RETHUNK_CFLAGS) endif +export RETHUNK_CFLAGS export RETPOLINE_CFLAGS export RETPOLINE_VDSO_CFLAGS diff --git a/drivers/misc/lkdtm/Makefile b/drivers/misc/lkdtm/Makefile index 2e0aa74ac1850..95ef971b5e1cb 100644 --- a/drivers/misc/lkdtm/Makefile +++ b/drivers/misc/lkdtm/Makefile @@ -13,10 +13,13 @@ lkdtm-$(CONFIG_LKDTM) += cfi.o lkdtm-$(CONFIG_LKDTM) += fortify.o lkdtm-$(CONFIG_PPC_64S_HASH_MMU) += powerpc.o -KASAN_SANITIZE_rodata.o := n KASAN_SANITIZE_stackleak.o := n -KCOV_INSTRUMENT_rodata.o := n -CFLAGS_REMOVE_rodata.o += $(CC_FLAGS_LTO) + +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) OBJCOPYFLAGS := OBJCOPYFLAGS_rodata_objcopy.o := \ |