Merge branch 'for-next/bti' into for-next/core

Support for Branch Target Identification (BTI) in user and kernel
(Mark Brown and others)
* for-next/bti: (39 commits)
  arm64: vdso: Fix CFI directives in sigreturn trampoline
  arm64: vdso: Don't prefix sigreturn trampoline with a BTI C instruction
  arm64: bti: Fix support for userspace only BTI
  arm64: kconfig: Update and comment GCC version check for kernel BTI
  arm64: vdso: Map the vDSO text with guarded pages when built for BTI
  arm64: vdso: Force the vDSO to be linked as BTI when built for BTI
  arm64: vdso: Annotate for BTI
  arm64: asm: Provide a mechanism for generating ELF note for BTI
  arm64: bti: Provide Kconfig for kernel mode BTI
  arm64: mm: Mark executable text as guarded pages
  arm64: bpf: Annotate JITed code for BTI
  arm64: Set GP bit in kernel page tables to enable BTI for the kernel
  arm64: asm: Override SYM_FUNC_START when building the kernel with BTI
  arm64: bti: Support building kernel C code using BTI
  arm64: Document why we enable PAC support for leaf functions
  arm64: insn: Report PAC and BTI instructions as skippable
  arm64: insn: Don't assume unrecognized HINTs are skippable
  arm64: insn: Provide a better name for aarch64_insn_is_nop()
  arm64: insn: Add constants for new HINT instruction decode
  arm64: Disable old style assembly annotations
  ...

1 files changed, 43 insertions, 0 deletions

diff --git a/include/linux/elf.h b/include/linux/elf.h
index e3649b3e970e..5d5b0321da0b 100644
--- a/include/linux/elf.h
+++ b/include/linux/elf.h
@@ -2,6 +2,7 @@
 #ifndef _LINUX_ELF_H
 #define _LINUX_ELF_H
 
+#include <linux/types.h>
 #include <asm/elf.h>
 #include <uapi/linux/elf.h>
 
@@ -21,6 +22,9 @@
 	SET_PERSONALITY(ex)
 #endif
 
+#define ELF32_GNU_PROPERTY_ALIGN	4
+#define ELF64_GNU_PROPERTY_ALIGN	8
+
 #if ELF_CLASS == ELFCLASS32
 
 extern Elf32_Dyn _DYNAMIC [];
@@ -31,6 +35,7 @@ extern Elf32_Dyn _DYNAMIC [];
 #define elf_addr_t	Elf32_Off
 #define Elf_Half	Elf32_Half
 #define Elf_Word	Elf32_Word
+#define ELF_GNU_PROPERTY_ALIGN	ELF32_GNU_PROPERTY_ALIGN
 
 #else
 
@@ -42,6 +47,7 @@ extern Elf64_Dyn _DYNAMIC [];
 #define elf_addr_t	Elf64_Off
 #define Elf_Half	Elf64_Half
 #define Elf_Word	Elf64_Word
+#define ELF_GNU_PROPERTY_ALIGN	ELF64_GNU_PROPERTY_ALIGN
 
 #endif
 
@@ -56,4 +62,41 @@ static inline int elf_coredump_extra_notes_write(struct coredump_params *cprm) {
 extern int elf_coredump_extra_notes_size(void);
 extern int elf_coredump_extra_notes_write(struct coredump_params *cprm);
 #endif
+
+/*
+ * NT_GNU_PROPERTY_TYPE_0 header:
+ * Keep this internal until/unless there is an agreed UAPI definition.
+ * pr_type values (GNU_PROPERTY_*) are public and defined in the UAPI header.
+ */
+struct gnu_property {
+	u32 pr_type;
+	u32 pr_datasz;
+};
+
+struct arch_elf_state;
+
+#ifndef CONFIG_ARCH_USE_GNU_PROPERTY
+static inline int arch_parse_elf_property(u32 type, const void *data,
+					  size_t datasz, bool compat,
+					  struct arch_elf_state *arch)
+{
+	return 0;
+}
+#else
+extern int arch_parse_elf_property(u32 type, const void *data, size_t datasz,
+				   bool compat, struct arch_elf_state *arch);
+#endif
+
+#ifdef CONFIG_ARCH_HAVE_ELF_PROT
+int arch_elf_adjust_prot(int prot, const struct arch_elf_state *state,
+			 bool has_interp, bool is_interp);
+#else
+static inline int arch_elf_adjust_prot(int prot,
+				       const struct arch_elf_state *state,
+				       bool has_interp, bool is_interp)
+{
+	return prot;
+}
+#endif
+
 #endif /* _LINUX_ELF_H */