[RFC PATCH 1/4] ELF: Add platform-specific AT_FLAGS initialisation support

[Maciej W. Rozycki]

Signed-off-by: Maciej W. Rozycki <macro@xxxxxxxxxx>
---
linux-elf-at-flags.diff
Index: linux-sfr-test/fs/binfmt_elf.c
===================================================================
--- linux-sfr-test.orig/fs/binfmt_elf.c	2015-09-08 15:24:00.927208000 +0100
+++ linux-sfr-test/fs/binfmt_elf.c	2015-09-08 15:26:10.318310000 +0100
@@ -72,6 +72,10 @@ static int elf_core_dump(struct coredump
 #define ELF_MIN_ALIGN	PAGE_SIZE
 #endif
 
+#ifndef ELF_FLAGS
+#define ELF_FLAGS	0
+#endif
+
 #ifndef ELF_CORE_EFLAGS
 #define ELF_CORE_EFLAGS	0
 #endif
@@ -238,7 +242,7 @@ create_elf_tables(struct linux_binprm *b
 	NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr));
 	NEW_AUX_ENT(AT_PHNUM, exec->e_phnum);
 	NEW_AUX_ENT(AT_BASE, interp_load_addr);
-	NEW_AUX_ENT(AT_FLAGS, 0);
+	NEW_AUX_ENT(AT_FLAGS, ELF_FLAGS);
 	NEW_AUX_ENT(AT_ENTRY, exec->e_entry);
 	NEW_AUX_ENT(AT_UID, from_kuid_munged(cred->user_ns, cred->uid));
 	NEW_AUX_ENT(AT_EUID, from_kuid_munged(cred->user_ns, cred->euid));
Index: linux-sfr-test/fs/binfmt_elf_fdpic.c
===================================================================
--- linux-sfr-test.orig/fs/binfmt_elf_fdpic.c	2015-09-08 15:24:00.950209000 +0100
+++ linux-sfr-test/fs/binfmt_elf_fdpic.c	2015-09-08 15:29:25.860980000 +0100
@@ -80,6 +80,10 @@ static int elf_fdpic_map_file_by_direct_
 static int elf_fdpic_core_dump(struct coredump_params *cprm);
 #endif
 
+#ifndef ELF_FLAGS
+#define ELF_FLAGS	0
+#endif
+
 static struct linux_binfmt elf_fdpic_format = {
 	.module		= THIS_MODULE,
 	.load_binary	= load_elf_fdpic_binary,
@@ -616,7 +620,7 @@ static int create_elf_fdpic_tables(struc
 	NEW_AUX_ENT(AT_PHENT,	sizeof(struct elf_phdr));
 	NEW_AUX_ENT(AT_PHNUM,	exec_params->hdr.e_phnum);
 	NEW_AUX_ENT(AT_BASE,	interp_params->elfhdr_addr);
-	NEW_AUX_ENT(AT_FLAGS,	0);
+	NEW_AUX_ENT(AT_FLAGS,	ELF_FLAGS);
 	NEW_AUX_ENT(AT_ENTRY,	exec_params->entry_addr);
 	NEW_AUX_ENT(AT_UID,	(elf_addr_t) from_kuid_munged(cred->user_ns, cred->uid));
 	NEW_AUX_ENT(AT_EUID,	(elf_addr_t) from_kuid_munged(cred->user_ns, cred->euid));
--
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