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Subject[GIT PULL] x86/urgent for v5.9-rc6
Hi Linus,

please pull the x86/urgent pile accumulated so far.

Thx.

---
The following changes since commit f4d51dffc6c01a9e94650d95ce0104964f8ae822:

Linux 5.9-rc4 (2020-09-06 17:11:40 -0700)

are available in the Git repository at:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git tags/x86_urgent_for_v5.9_rc6

for you to fetch changes up to 6f9885a36c006d798319661fa849f9c2922223b9:

x86/unwind/fp: Fix FP unwinding in ret_from_fork (2020-09-18 09:59:40 +0200)

----------------------------------------------------------------
* A defconfig fix, from Daniel Díaz.

* Disable relocation relaxation for the compressed kernel when not built
as -pie as in that case kernels built with clang and linked with LLD
fail to boot due to the linker optimizing some instructions in non-PIE
form; the gory details in the commit message, from Arvind Sankar.

* A fix for the "bad bp value" warning issued by the frame-pointer
unwinder, from Josh Poimboeuf.

----------------------------------------------------------------
Arvind Sankar (1):
x86/boot/compressed: Disable relocation relaxation

Daniel Díaz (1):
x86/defconfigs: Explicitly unset CONFIG_64BIT in i386_defconfig

Josh Poimboeuf (1):
x86/unwind/fp: Fix FP unwinding in ret_from_fork

arch/x86/boot/compressed/Makefile | 2 ++
arch/x86/configs/i386_defconfig | 1 +
arch/x86/include/asm/frame.h | 19 +++++++++++++++++++
arch/x86/kernel/process.c | 3 ++-
4 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
index 3962f592633d..ff7894f39e0e 100644
--- a/arch/x86/boot/compressed/Makefile
+++ b/arch/x86/boot/compressed/Makefile
@@ -43,6 +43,8 @@ KBUILD_CFLAGS += -Wno-pointer-sign
KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
KBUILD_CFLAGS += -D__DISABLE_EXPORTS
+# Disable relocation relaxation in case the link is not PIE.
+KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mrelax-relocations=no)

KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__
GCOV_PROFILE := n
diff --git a/arch/x86/configs/i386_defconfig b/arch/x86/configs/i386_defconfig
index d7577fece9eb..4cfdf5755ab5 100644
--- a/arch/x86/configs/i386_defconfig
+++ b/arch/x86/configs/i386_defconfig
@@ -19,6 +19,7 @@ CONFIG_CGROUP_CPUACCT=y
CONFIG_BLK_DEV_INITRD=y
# CONFIG_COMPAT_BRK is not set
CONFIG_PROFILING=y
+# CONFIG_64BIT is not set
CONFIG_SMP=y
CONFIG_X86_GENERIC=y
CONFIG_HPET_TIMER=y
diff --git a/arch/x86/include/asm/frame.h b/arch/x86/include/asm/frame.h
index 296b346184b2..fb42659f6e98 100644
--- a/arch/x86/include/asm/frame.h
+++ b/arch/x86/include/asm/frame.h
@@ -60,12 +60,26 @@
#define FRAME_END "pop %" _ASM_BP "\n"

#ifdef CONFIG_X86_64
+
#define ENCODE_FRAME_POINTER \
"lea 1(%rsp), %rbp\n\t"
+
+static inline unsigned long encode_frame_pointer(struct pt_regs *regs)
+{
+ return (unsigned long)regs + 1;
+}
+
#else /* !CONFIG_X86_64 */
+
#define ENCODE_FRAME_POINTER \
"movl %esp, %ebp\n\t" \
"andl $0x7fffffff, %ebp\n\t"
+
+static inline unsigned long encode_frame_pointer(struct pt_regs *regs)
+{
+ return (unsigned long)regs & 0x7fffffff;
+}
+
#endif /* CONFIG_X86_64 */

#endif /* __ASSEMBLY__ */
@@ -83,6 +97,11 @@

#define ENCODE_FRAME_POINTER

+static inline unsigned long encode_frame_pointer(struct pt_regs *regs)
+{
+ return 0;
+}
+
#endif

#define FRAME_BEGIN
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 13ce616cc7af..ba4593a913fa 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -42,6 +42,7 @@
#include <asm/spec-ctrl.h>
#include <asm/io_bitmap.h>
#include <asm/proto.h>
+#include <asm/frame.h>

#include "process.h"

@@ -133,7 +134,7 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, unsigned long arg,
fork_frame = container_of(childregs, struct fork_frame, regs);
frame = &fork_frame->frame;

- frame->bp = 0;
+ frame->bp = encode_frame_pointer(childregs);
frame->ret_addr = (unsigned long) ret_from_fork;
p->thread.sp = (unsigned long) fork_frame;
p->thread.io_bitmap = NULL;
--
Regards/Gruss,
Boris.

SUSE Software Solutions Germany GmbH, GF: Felix Imendörffer, HRB 36809, AG Nürnberg

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