ELF: Also pass any interpreter's file header to `arch_check_elf'

Also pass any interpreter's file header to `arch_check_elf' so that any
architecture handler can have a look at it if needed.

Signed-off-by: Maciej W. Rozycki <macro@imgtec.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Matthew Fortune <Matthew.Fortune@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/11478/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/elf.h

@@ -448,7 +448,7 @@ struct arch_elf_state {
 extern int arch_elf_pt_proc(void *ehdr, void *phdr, struct file *elf,
 			    bool is_interp, struct arch_elf_state *state);
 
-extern int arch_check_elf(void *ehdr, bool has_interpreter,
+extern int arch_check_elf(void *ehdr, bool has_interpreter, void *interp_ehdr,
 			  struct arch_elf_state *state);
 
 extern void mips_set_personality_fp(struct arch_elf_state *state);

arch/mips/kernel/elf.c

@@ -128,7 +128,7 @@ int arch_elf_pt_proc(void *_ehdr, void *_phdr, struct file *elf,
 	return 0;
 }
 
-int arch_check_elf(void *_ehdr, bool has_interpreter,
+int arch_check_elf(void *_ehdr, bool has_interpreter, void *_interp_ehdr,
 		   struct arch_elf_state *state)
 {
 	union {

fs/binfmt_elf.c

@@ -491,6 +491,7 @@ static inline int arch_elf_pt_proc(struct elfhdr *ehdr,
  * arch_check_elf() - check an ELF executable
  * @ehdr:	The main ELF header
  * @has_interp:	True if the ELF has an interpreter, else false.
+ * @interp_ehdr: The interpreter's ELF header
  * @state:	Architecture-specific state preserved throughout the process
  *		of loading the ELF.
  *
@@ -502,6 +503,7 @@ static inline int arch_elf_pt_proc(struct elfhdr *ehdr,
  *         with that return code.
  */
 static inline int arch_check_elf(struct elfhdr *ehdr, bool has_interp,
+				 struct elfhdr *interp_ehdr,
 				 struct arch_elf_state *state)
 {
 	/* Dummy implementation, always proceed */
@@ -829,7 +831,9 @@ static int load_elf_binary(struct linux_binprm *bprm)
 	 * still possible to return an error to the code that invoked
 	 * the exec syscall.
 	 */
-	retval = arch_check_elf(&loc->elf_ex, !!interpreter, &arch_state);
+	retval = arch_check_elf(&loc->elf_ex,
+				!!interpreter, &loc->interp_elf_ex,
+				&arch_state);
 	if (retval)
 		goto out_free_dentry;