binfmt_flat cleanups and RISC-V support v2

binfmt_flat cleanups and RISC-V support v2

[Christoph Hellwig]

Hi Greg,

below is a larger stash of cleanups for the binfmt_misc code,
preparing for the last patch that now trivially adds RISC-V
support, which will be used for the RISC-V nommu series I am
about to post.

Changes since v2:
 - fix the handling of old format flags
 - don't pass arguments on stack for RISC-V
 - small cleanups for flat_v2_reloc_t

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[PATCH 01/17] binfmt_flat: remove flat_reloc_valid

[Christoph Hellwig]

This helper is the same for all architectures, open code it in the only
caller.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Vladimir Murzin <vladimir.murzin@arm.com>
Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com>
---
 arch/arm/include/asm/flat.h        | 1 -
 arch/c6x/include/asm/flat.h        | 1 -
 arch/h8300/include/asm/flat.h      | 1 -
 arch/m68k/include/asm/flat.h       | 1 -
 arch/microblaze/include/asm/flat.h | 1 -
 arch/sh/include/asm/flat.h         | 1 -
 arch/xtensa/include/asm/flat.h     | 1 -
 fs/binfmt_flat.c                   | 2 +-
 8 files changed, 1 insertion(+), 8 deletions(-)

diff --git a/arch/arm/include/asm/flat.h b/arch/arm/include/asm/flat.h
index f0c75ddeea23..10cce9ecf151 100644
--- a/arch/arm/include/asm/flat.h
+++ b/arch/arm/include/asm/flat.h
@@ -10,7 +10,6 @@
 
 #define	flat_argvp_envp_on_stack()		1
 #define	flat_old_ram_flag(flags)		(flags)
-#define	flat_reloc_valid(reloc, size)		((reloc) <= (size))
 
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
 					u32 *addr, u32 *persistent)
diff --git a/arch/c6x/include/asm/flat.h b/arch/c6x/include/asm/flat.h
index 76fd0bb962a3..ecc6aea6606c 100644
--- a/arch/c6x/include/asm/flat.h
+++ b/arch/c6x/include/asm/flat.h
@@ -6,7 +6,6 @@
 
 #define flat_argvp_envp_on_stack()			0
 #define flat_old_ram_flag(flags)			(flags)
-#define flat_reloc_valid(reloc, size)			((reloc) <= (size))
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
 					u32 *addr, u32 *persistent)
 {
diff --git a/arch/h8300/include/asm/flat.h b/arch/h8300/include/asm/flat.h
index f4cdfcbdd2ba..dcc7775115dd 100644
--- a/arch/h8300/include/asm/flat.h
+++ b/arch/h8300/include/asm/flat.h
@@ -10,7 +10,6 @@
 
 #define	flat_argvp_envp_on_stack()		1
 #define	flat_old_ram_flag(flags)		1
-#define	flat_reloc_valid(reloc, size)		((reloc) <= (size))
 #define	flat_set_persistent(relval, p)		0
 
 /*
diff --git a/arch/m68k/include/asm/flat.h b/arch/m68k/include/asm/flat.h
index 4f1d1e373420..a631caf5e18f 100644
--- a/arch/m68k/include/asm/flat.h
+++ b/arch/m68k/include/asm/flat.h
@@ -10,7 +10,6 @@
 
 #define	flat_argvp_envp_on_stack()		1
 #define	flat_old_ram_flag(flags)		(flags)
-#define	flat_reloc_valid(reloc, size)		((reloc) <= (size))
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
 					u32 *addr, u32 *persistent)
 {
diff --git a/arch/microblaze/include/asm/flat.h b/arch/microblaze/include/asm/flat.h
index 3d2747d4c967..34be5ed011be 100644
--- a/arch/microblaze/include/asm/flat.h
+++ b/arch/microblaze/include/asm/flat.h
@@ -15,7 +15,6 @@
 
 #define	flat_argvp_envp_on_stack()	0
 #define	flat_old_ram_flag(flags)	(flags)
-#define	flat_reloc_valid(reloc, size)	((reloc) <= (size))
 #define	flat_set_persistent(relval, p)		0
 
 /*
diff --git a/arch/sh/include/asm/flat.h b/arch/sh/include/asm/flat.h
index 843d458b8329..8f2929b32f2e 100644
--- a/arch/sh/include/asm/flat.h
+++ b/arch/sh/include/asm/flat.h
@@ -13,7 +13,6 @@
 
 #define	flat_argvp_envp_on_stack()		0
 #define	flat_old_ram_flag(flags)		(flags)
-#define	flat_reloc_valid(reloc, size)		((reloc) <= (size))
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
 					u32 *addr, u32 *persistent)
 {
diff --git a/arch/xtensa/include/asm/flat.h b/arch/xtensa/include/asm/flat.h
index b8532d7877b3..6ee5a35eb0ec 100644
--- a/arch/xtensa/include/asm/flat.h
+++ b/arch/xtensa/include/asm/flat.h
@@ -6,7 +6,6 @@
 
 #define flat_argvp_envp_on_stack()			0
 #define flat_old_ram_flag(flags)			(flags)
-#define flat_reloc_valid(reloc, size)			((reloc) <= (size))
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
 					u32 *addr, u32 *persistent)
 {
diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index 82a48e830018..afddea583999 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -345,7 +345,7 @@ calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp)
 	start_code = p->lib_list[id].start_code;
 	text_len = p->lib_list[id].text_len;
 
-	if (!flat_reloc_valid(r, start_brk - start_data + text_len)) {
+	if (r > start_brk - start_data + text_len) {
 		pr_err("reloc outside program 0x%lx (0 - 0x%lx/0x%lx)",
 		       r, start_brk-start_data+text_len, text_len);
 		goto failed;
-- 
2.20.1


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[PATCH 02/17] binfmt_flat: remove flat_set_persistent

[Christoph Hellwig]

This helper is a no-op on all architectures, remove it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Vladimir Murzin <vladimir.murzin@arm.com>
Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com>
---
 arch/arm/include/asm/flat.h        | 1 -
 arch/c6x/include/asm/flat.h        | 1 -
 arch/h8300/include/asm/flat.h      | 1 -
 arch/m68k/include/asm/flat.h       | 5 -----
 arch/microblaze/include/asm/flat.h | 1 -
 arch/sh/include/asm/flat.h         | 1 -
 arch/xtensa/include/asm/flat.h     | 1 -
 fs/binfmt_flat.c                   | 2 --
 8 files changed, 13 deletions(-)

diff --git a/arch/arm/include/asm/flat.h b/arch/arm/include/asm/flat.h
index 10cce9ecf151..576241d74704 100644
--- a/arch/arm/include/asm/flat.h
+++ b/arch/arm/include/asm/flat.h
@@ -31,6 +31,5 @@ static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel)
 }
 
 #define	flat_get_relocate_addr(rel)		(rel)
-#define	flat_set_persistent(relval, p)		0
 
 #endif /* __ARM_FLAT_H__ */
diff --git a/arch/c6x/include/asm/flat.h b/arch/c6x/include/asm/flat.h
index ecc6aea6606c..ac87368efad1 100644
--- a/arch/c6x/include/asm/flat.h
+++ b/arch/c6x/include/asm/flat.h
@@ -18,6 +18,5 @@ static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel)
 	return 0;
 }
 #define flat_get_relocate_addr(rel)			(rel)
-#define flat_set_persistent(relval, p)			0
 
 #endif /* __ASM_C6X_FLAT_H */
diff --git a/arch/h8300/include/asm/flat.h b/arch/h8300/include/asm/flat.h
index dcc7775115dd..7ef7eefded3d 100644
--- a/arch/h8300/include/asm/flat.h
+++ b/arch/h8300/include/asm/flat.h
@@ -10,7 +10,6 @@
 
 #define	flat_argvp_envp_on_stack()		1
 #define	flat_old_ram_flag(flags)		1
-#define	flat_set_persistent(relval, p)		0
 
 /*
  * on the H8 a couple of the relocations have an instruction in the
diff --git a/arch/m68k/include/asm/flat.h b/arch/m68k/include/asm/flat.h
index a631caf5e18f..955617bb937b 100644
--- a/arch/m68k/include/asm/flat.h
+++ b/arch/m68k/include/asm/flat.h
@@ -30,11 +30,6 @@ static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel)
 }
 #define	flat_get_relocate_addr(rel)		(rel)
 
-static inline int flat_set_persistent(u32 relval, u32 *persistent)
-{
-	return 0;
-}
-
 #define FLAT_PLAT_INIT(regs) \
 	do { \
 		if (current->mm) \
diff --git a/arch/microblaze/include/asm/flat.h b/arch/microblaze/include/asm/flat.h
index 34be5ed011be..846084fa7f04 100644
--- a/arch/microblaze/include/asm/flat.h
+++ b/arch/microblaze/include/asm/flat.h
@@ -15,7 +15,6 @@
 
 #define	flat_argvp_envp_on_stack()	0
 #define	flat_old_ram_flag(flags)	(flags)
-#define	flat_set_persistent(relval, p)		0
 
 /*
  * Microblaze works a little differently from other arches, because
diff --git a/arch/sh/include/asm/flat.h b/arch/sh/include/asm/flat.h
index 8f2929b32f2e..6f3b18679a98 100644
--- a/arch/sh/include/asm/flat.h
+++ b/arch/sh/include/asm/flat.h
@@ -25,7 +25,6 @@ static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel)
 	return 0;
 }
 #define	flat_get_relocate_addr(rel)		(rel)
-#define	flat_set_persistent(relval, p)		({ (void)p; 0; })
 
 #define FLAT_PLAT_INIT(_r) \
   do { _r->regs[0]=0; _r->regs[1]=0; _r->regs[2]=0; _r->regs[3]=0; \
diff --git a/arch/xtensa/include/asm/flat.h b/arch/xtensa/include/asm/flat.h
index 6ee5a35eb0ec..b1bc0d9a8d4e 100644
--- a/arch/xtensa/include/asm/flat.h
+++ b/arch/xtensa/include/asm/flat.h
@@ -18,6 +18,5 @@ static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel)
 	return 0;
 }
 #define flat_get_relocate_addr(rel)			(rel)
-#define flat_set_persistent(relval, p)			0
 
 #endif /* __ASM_XTENSA_FLAT_H */
diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index afddea583999..a4c0b245ab1f 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -787,8 +787,6 @@ static int load_flat_file(struct linux_binprm *bprm,
 			if (get_user(relval, reloc + i))
 				return -EFAULT;
 			relval = ntohl(relval);
-			if (flat_set_persistent(relval, &persistent))
-				continue;
 			addr = flat_get_relocate_addr(relval);
 			rp = (u32 __user *)calc_reloc(addr, libinfo, id, 1);
 			if (rp == (u32 __user *)RELOC_FAILED) {
-- 
2.20.1


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[PATCH 03/17] binfmt_flat: provide a default version of flat_get_relocate_addr

[Christoph Hellwig]

This way only the two architectures that do masking need to provide
the helper.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Vladimir Murzin <vladimir.murzin@arm.com>
Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com>
---
 arch/arm/include/asm/flat.h    | 2 --
 arch/c6x/include/asm/flat.h    | 1 -
 arch/m68k/include/asm/flat.h   | 1 -
 arch/sh/include/asm/flat.h     | 1 -
 arch/xtensa/include/asm/flat.h | 1 -
 fs/binfmt_flat.c               | 4 ++++
 6 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/arch/arm/include/asm/flat.h b/arch/arm/include/asm/flat.h
index 576241d74704..a185fe023b60 100644
--- a/arch/arm/include/asm/flat.h
+++ b/arch/arm/include/asm/flat.h
@@ -30,6 +30,4 @@ static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel)
 #endif
 }
 
-#define	flat_get_relocate_addr(rel)		(rel)
-
 #endif /* __ARM_FLAT_H__ */
diff --git a/arch/c6x/include/asm/flat.h b/arch/c6x/include/asm/flat.h
index ac87368efad1..c4d703b454c6 100644
--- a/arch/c6x/include/asm/flat.h
+++ b/arch/c6x/include/asm/flat.h
@@ -17,6 +17,5 @@ static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel)
 	put_unaligned(addr, (__force u32 *)rp);
 	return 0;
 }
-#define flat_get_relocate_addr(rel)			(rel)
 
 #endif /* __ASM_C6X_FLAT_H */
diff --git a/arch/m68k/include/asm/flat.h b/arch/m68k/include/asm/flat.h
index 955617bb937b..217fa89c8e34 100644
--- a/arch/m68k/include/asm/flat.h
+++ b/arch/m68k/include/asm/flat.h
@@ -28,7 +28,6 @@ static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel)
 	return put_user(addr, rp);
 #endif
 }
-#define	flat_get_relocate_addr(rel)		(rel)
 
 #define FLAT_PLAT_INIT(regs) \
 	do { \
diff --git a/arch/sh/include/asm/flat.h b/arch/sh/include/asm/flat.h
index 6f3b18679a98..0d520b4cc5ea 100644
--- a/arch/sh/include/asm/flat.h
+++ b/arch/sh/include/asm/flat.h
@@ -24,7 +24,6 @@ static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel)
 	put_unaligned(addr, (__force u32 *)rp);
 	return 0;
 }
-#define	flat_get_relocate_addr(rel)		(rel)
 
 #define FLAT_PLAT_INIT(_r) \
   do { _r->regs[0]=0; _r->regs[1]=0; _r->regs[2]=0; _r->regs[3]=0; \
diff --git a/arch/xtensa/include/asm/flat.h b/arch/xtensa/include/asm/flat.h
index b1bc0d9a8d4e..a1d88aa3ef8a 100644
--- a/arch/xtensa/include/asm/flat.h
+++ b/arch/xtensa/include/asm/flat.h
@@ -17,6 +17,5 @@ static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel)
 	put_unaligned(addr, (__force u32 *)rp);
 	return 0;
 }
-#define flat_get_relocate_addr(rel)			(rel)
 
 #endif /* __ASM_XTENSA_FLAT_H */
diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index a4c0b245ab1f..c0e4535dc1ec 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -43,6 +43,10 @@
 #include <asm/cacheflush.h>
 #include <asm/page.h>
 
+#ifndef flat_get_relocate_addr
+#define flat_get_relocate_addr(rel)	(rel)
+#endif
+
 /****************************************************************************/
 
 /*
-- 
2.20.1


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[PATCH 04/17] binfmt_flat: remove flat_old_ram_flag

[Christoph Hellwig]

Instead add a Kconfig variable that only h8300 selects.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/arm/include/asm/flat.h        | 1 -
 arch/c6x/include/asm/flat.h        | 1 -
 arch/h8300/Kconfig                 | 1 +
 arch/h8300/include/asm/flat.h      | 1 -
 arch/m68k/include/asm/flat.h       | 1 -
 arch/microblaze/include/asm/flat.h | 1 -
 arch/sh/include/asm/flat.h         | 1 -
 arch/xtensa/include/asm/flat.h     | 1 -
 fs/Kconfig.binfmt                  | 3 +++
 fs/binfmt_flat.c                   | 3 ++-
 10 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/arch/arm/include/asm/flat.h b/arch/arm/include/asm/flat.h
index a185fe023b60..acf162111ee2 100644
--- a/arch/arm/include/asm/flat.h
+++ b/arch/arm/include/asm/flat.h
@@ -9,7 +9,6 @@
 #include <linux/uaccess.h>
 
 #define	flat_argvp_envp_on_stack()		1
-#define	flat_old_ram_flag(flags)		(flags)
 
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
 					u32 *addr, u32 *persistent)
diff --git a/arch/c6x/include/asm/flat.h b/arch/c6x/include/asm/flat.h
index c4d703b454c6..353e4d06e8c0 100644
--- a/arch/c6x/include/asm/flat.h
+++ b/arch/c6x/include/asm/flat.h
@@ -5,7 +5,6 @@
 #include <asm/unaligned.h>
 
 #define flat_argvp_envp_on_stack()			0
-#define flat_old_ram_flag(flags)			(flags)
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
 					u32 *addr, u32 *persistent)
 {
diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
index ecfc4b4b6373..d30e8727b02d 100644
--- a/arch/h8300/Kconfig
+++ b/arch/h8300/Kconfig
@@ -2,6 +2,7 @@
 config H8300
         def_bool y
 	select ARCH_32BIT_OFF_T
+	select BINFMT_FLAT_OLD_ALWAYS_RAM
 	select GENERIC_ATOMIC64
 	select HAVE_UID16
 	select VIRT_TO_BUS
diff --git a/arch/h8300/include/asm/flat.h b/arch/h8300/include/asm/flat.h
index 7ef7eefded3d..14cc928d5478 100644
--- a/arch/h8300/include/asm/flat.h
+++ b/arch/h8300/include/asm/flat.h
@@ -9,7 +9,6 @@
 #include <asm/unaligned.h>
 
 #define	flat_argvp_envp_on_stack()		1
-#define	flat_old_ram_flag(flags)		1
 
 /*
  * on the H8 a couple of the relocations have an instruction in the
diff --git a/arch/m68k/include/asm/flat.h b/arch/m68k/include/asm/flat.h
index 217fa89c8e34..7b1fb5c2809e 100644
--- a/arch/m68k/include/asm/flat.h
+++ b/arch/m68k/include/asm/flat.h
@@ -9,7 +9,6 @@
 #include <linux/uaccess.h>
 
 #define	flat_argvp_envp_on_stack()		1
-#define	flat_old_ram_flag(flags)		(flags)
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
 					u32 *addr, u32 *persistent)
 {
diff --git a/arch/microblaze/include/asm/flat.h b/arch/microblaze/include/asm/flat.h
index 846084fa7f04..1cd8d7f4cf12 100644
--- a/arch/microblaze/include/asm/flat.h
+++ b/arch/microblaze/include/asm/flat.h
@@ -14,7 +14,6 @@
 #include <asm/unaligned.h>
 
 #define	flat_argvp_envp_on_stack()	0
-#define	flat_old_ram_flag(flags)	(flags)
 
 /*
  * Microblaze works a little differently from other arches, because
diff --git a/arch/sh/include/asm/flat.h b/arch/sh/include/asm/flat.h
index 0d520b4cc5ea..015678d7b771 100644
--- a/arch/sh/include/asm/flat.h
+++ b/arch/sh/include/asm/flat.h
@@ -12,7 +12,6 @@
 #include <asm/unaligned.h>
 
 #define	flat_argvp_envp_on_stack()		0
-#define	flat_old_ram_flag(flags)		(flags)
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
 					u32 *addr, u32 *persistent)
 {
diff --git a/arch/xtensa/include/asm/flat.h b/arch/xtensa/include/asm/flat.h
index a1d88aa3ef8a..b215c1e66958 100644
--- a/arch/xtensa/include/asm/flat.h
+++ b/arch/xtensa/include/asm/flat.h
@@ -5,7 +5,6 @@
 #include <asm/unaligned.h>
 
 #define flat_argvp_envp_on_stack()			0
-#define flat_old_ram_flag(flags)			(flags)
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
 					u32 *addr, u32 *persistent)
 {
diff --git a/fs/Kconfig.binfmt b/fs/Kconfig.binfmt
index f87ddd1b6d72..5658e12ad944 100644
--- a/fs/Kconfig.binfmt
+++ b/fs/Kconfig.binfmt
@@ -97,6 +97,9 @@ config BINFMT_FLAT
 	help
 	  Support uClinux FLAT format binaries.
 
+config BINFMT_FLAT_OLD_ALWAYS_RAM
+	bool
+
 config BINFMT_ZFLAT
 	bool "Enable ZFLAT support"
 	depends on BINFMT_FLAT
diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index c0e4535dc1ec..3e7f4a6cffa2 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -488,7 +488,8 @@ static int load_flat_file(struct linux_binprm *bprm,
 	 * fix up the flags for the older format,  there were all kinds
 	 * of endian hacks,  this only works for the simple cases
 	 */
-	if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags))
+	if (rev == OLD_FLAT_VERSION &&
+	   (flags || IS_ENABLED(CONFIG_BINFMT_FLAT_OLD_ALWAYS_RAM)))
 		flags = FLAT_FLAG_RAM;
 
 #ifndef CONFIG_BINFMT_ZFLAT
-- 
2.20.1


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[PATCH 05/17] binfmt_flat: replace flat_argvp_envp_on_stack with a Kconfig variable

[Christoph Hellwig]

This will eventually allow us to kill the need for an <asm/flat.h> for
many cases.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Vladimir Murzin <vladimir.murzin@arm.com>
Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com>
---
 arch/arm/Kconfig                   | 1 +
 arch/arm/include/asm/flat.h        | 2 --
 arch/c6x/include/asm/flat.h        | 1 -
 arch/h8300/Kconfig                 | 1 +
 arch/h8300/include/asm/flat.h      | 2 --
 arch/m68k/Kconfig                  | 1 +
 arch/m68k/include/asm/flat.h       | 1 -
 arch/microblaze/include/asm/flat.h | 2 --
 arch/sh/include/asm/flat.h         | 1 -
 arch/xtensa/include/asm/flat.h     | 1 -
 fs/Kconfig.binfmt                  | 3 +++
 fs/binfmt_flat.c                   | 5 +++--
 12 files changed, 9 insertions(+), 12 deletions(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 8869742a85df..b1b48c0bde76 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -30,6 +30,7 @@ config ARM
 	select ARCH_USE_BUILTIN_BSWAP
 	select ARCH_USE_CMPXCHG_LOCKREF
 	select ARCH_WANT_IPC_PARSE_VERSION
+	select BINFMT_FLAT_ARGVP_ENVP_ON_STACK
 	select BUILDTIME_EXTABLE_SORT if MMU
 	select CLONE_BACKWARDS
 	select CPU_PM if SUSPEND || CPU_IDLE
diff --git a/arch/arm/include/asm/flat.h b/arch/arm/include/asm/flat.h
index acf162111ee2..bbc27901446f 100644
--- a/arch/arm/include/asm/flat.h
+++ b/arch/arm/include/asm/flat.h
@@ -8,8 +8,6 @@
 
 #include <linux/uaccess.h>
 
-#define	flat_argvp_envp_on_stack()		1
-
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
 					u32 *addr, u32 *persistent)
 {
diff --git a/arch/c6x/include/asm/flat.h b/arch/c6x/include/asm/flat.h
index 353e4d06e8c0..2d57a9204d21 100644
--- a/arch/c6x/include/asm/flat.h
+++ b/arch/c6x/include/asm/flat.h
@@ -4,7 +4,6 @@
 
 #include <asm/unaligned.h>
 
-#define flat_argvp_envp_on_stack()			0
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
 					u32 *addr, u32 *persistent)
 {
diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
index d30e8727b02d..7457f190caaa 100644
--- a/arch/h8300/Kconfig
+++ b/arch/h8300/Kconfig
@@ -2,6 +2,7 @@
 config H8300
         def_bool y
 	select ARCH_32BIT_OFF_T
+	select BINFMT_FLAT_ARGVP_ENVP_ON_STACK
 	select BINFMT_FLAT_OLD_ALWAYS_RAM
 	select GENERIC_ATOMIC64
 	select HAVE_UID16
diff --git a/arch/h8300/include/asm/flat.h b/arch/h8300/include/asm/flat.h
index 14cc928d5478..4683146f0e9e 100644
--- a/arch/h8300/include/asm/flat.h
+++ b/arch/h8300/include/asm/flat.h
@@ -8,8 +8,6 @@
 
 #include <asm/unaligned.h>
 
-#define	flat_argvp_envp_on_stack()		1
-
 /*
  * on the H8 a couple of the relocations have an instruction in the
  * top byte.  As there can only be 24bits of address space,  we just
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index 218e037ef901..fd69ee5ad6ab 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -7,6 +7,7 @@ config M68K
 	select ARCH_MIGHT_HAVE_PC_PARPORT if ISA
 	select ARCH_NO_COHERENT_DMA_MMAP if !MMU
 	select ARCH_NO_PREEMPT if !COLDFIRE
+	select BINFMT_FLAT_ARGVP_ENVP_ON_STACK
 	select HAVE_IDE
 	select HAVE_AOUT if MMU
 	select HAVE_DEBUG_BUGVERBOSE
diff --git a/arch/m68k/include/asm/flat.h b/arch/m68k/include/asm/flat.h
index 7b1fb5c2809e..d7102fcd43eb 100644
--- a/arch/m68k/include/asm/flat.h
+++ b/arch/m68k/include/asm/flat.h
@@ -8,7 +8,6 @@
 
 #include <linux/uaccess.h>
 
-#define	flat_argvp_envp_on_stack()		1
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
 					u32 *addr, u32 *persistent)
 {
diff --git a/arch/microblaze/include/asm/flat.h b/arch/microblaze/include/asm/flat.h
index 1cd8d7f4cf12..9e3d8e01d294 100644
--- a/arch/microblaze/include/asm/flat.h
+++ b/arch/microblaze/include/asm/flat.h
@@ -13,8 +13,6 @@
 
 #include <asm/unaligned.h>
 
-#define	flat_argvp_envp_on_stack()	0
-
 /*
  * Microblaze works a little differently from other arches, because
  * of the MICROBLAZE_64 reloc type. Here, a 32 bit address is split
diff --git a/arch/sh/include/asm/flat.h b/arch/sh/include/asm/flat.h
index 015678d7b771..1002343dd84a 100644
--- a/arch/sh/include/asm/flat.h
+++ b/arch/sh/include/asm/flat.h
@@ -11,7 +11,6 @@
 
 #include <asm/unaligned.h>
 
-#define	flat_argvp_envp_on_stack()		0
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
 					u32 *addr, u32 *persistent)
 {
diff --git a/arch/xtensa/include/asm/flat.h b/arch/xtensa/include/asm/flat.h
index b215c1e66958..3d357371b28b 100644
--- a/arch/xtensa/include/asm/flat.h
+++ b/arch/xtensa/include/asm/flat.h
@@ -4,7 +4,6 @@
 
 #include <asm/unaligned.h>
 
-#define flat_argvp_envp_on_stack()			0
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
 					u32 *addr, u32 *persistent)
 {
diff --git a/fs/Kconfig.binfmt b/fs/Kconfig.binfmt
index 5658e12ad944..82f7d7f234f3 100644
--- a/fs/Kconfig.binfmt
+++ b/fs/Kconfig.binfmt
@@ -97,6 +97,9 @@ config BINFMT_FLAT
 	help
 	  Support uClinux FLAT format binaries.
 
+config BINFMT_FLAT_ARGVP_ENVP_ON_STACK
+	bool
+
 config BINFMT_FLAT_OLD_ALWAYS_RAM
 	bool
 
diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index 3e7f4a6cffa2..a15fdd5d95ed 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -124,14 +124,15 @@ static int create_flat_tables(struct linux_binprm *bprm, unsigned long arg_start
 
 	sp -= bprm->envc + 1;
 	sp -= bprm->argc + 1;
-	sp -= flat_argvp_envp_on_stack() ? 2 : 0;
+	if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK))
+		sp -= 2; /* argvp + envp */
 	sp -= 1;  /* &argc */
 
 	current->mm->start_stack = (unsigned long)sp & -FLAT_STACK_ALIGN;
 	sp = (unsigned long __user *)current->mm->start_stack;
 
 	__put_user(bprm->argc, sp++);
-	if (flat_argvp_envp_on_stack()) {
+	if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK)) {
 		unsigned long argv, envp;
 		argv = (unsigned long)(sp + 2);
 		envp = (unsigned long)(sp + 2 + bprm->argc + 1);
-- 
2.20.1


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[PATCH 06/17] binfmt_flat: remove the uapi <linux/flat.h> header

[Christoph Hellwig]

The split between the two flat.h files is completely arbitrary, and the
uapi version even contains CONFIG_ ifdefs that can't work in userspace.
The only userspace program known to use the header is elf2flt, and it
ships with its own version of the combined header.

Use the chance to move the <asm/flat.h> inclusion out of this file, as it
is in no way needed for the format defintion, but just for the binfmt
implementation.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Vladimir Murzin <vladimir.murzin@arm.com>
Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com>
---
 fs/binfmt_flat.c          |  1 +
 include/linux/flat.h      | 45 ++++++++++++++++++++++++++---
 include/uapi/linux/flat.h | 59 ---------------------------------------
 3 files changed, 42 insertions(+), 63 deletions(-)
 delete mode 100644 include/uapi/linux/flat.h

diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index a15fdd5d95ed..b63c5e63ae3f 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -42,6 +42,7 @@
 #include <asm/unaligned.h>
 #include <asm/cacheflush.h>
 #include <asm/page.h>
+#include <asm/flat.h>
 
 #ifndef flat_get_relocate_addr
 #define flat_get_relocate_addr(rel)	(rel)
diff --git a/include/linux/flat.h b/include/linux/flat.h
index 569b67d64d5c..21d901ba191b 100644
--- a/include/linux/flat.h
+++ b/include/linux/flat.h
@@ -10,8 +10,47 @@
 #ifndef _LINUX_FLAT_H
 #define _LINUX_FLAT_H
 
-#include <uapi/linux/flat.h>
-#include <asm/flat.h>
+#define	FLAT_VERSION			0x00000004L
+
+#ifdef CONFIG_BINFMT_SHARED_FLAT
+#define	MAX_SHARED_LIBS			(4)
+#else
+#define	MAX_SHARED_LIBS			(1)
+#endif
+
+/*
+ * To make everything easier to port and manage cross platform
+ * development,  all fields are in network byte order.
+ */
+
+struct flat_hdr {
+	char magic[4];
+	unsigned long rev;          /* version (as above) */
+	unsigned long entry;        /* Offset of first executable instruction
+	                               with text segment from beginning of file */
+	unsigned long data_start;   /* Offset of data segment from beginning of
+	                               file */
+	unsigned long data_end;     /* Offset of end of data segment
+	                               from beginning of file */
+	unsigned long bss_end;      /* Offset of end of bss segment from beginning
+	                               of file */
+
+	/* (It is assumed that data_end through bss_end forms the bss segment.) */
+
+	unsigned long stack_size;   /* Size of stack, in bytes */
+	unsigned long reloc_start;  /* Offset of relocation records from
+	                               beginning of file */
+	unsigned long reloc_count;  /* Number of relocation records */
+	unsigned long flags;
+	unsigned long build_date;   /* When the program/library was built */
+	unsigned long filler[5];    /* Reservered, set to zero */
+};
+
+#define FLAT_FLAG_RAM    0x0001 /* load program entirely into RAM */
+#define FLAT_FLAG_GOTPIC 0x0002 /* program is PIC with GOT */
+#define FLAT_FLAG_GZIP   0x0004 /* all but the header is compressed */
+#define FLAT_FLAG_GZDATA 0x0008 /* only data/relocs are compressed (for XIP) */
+#define FLAT_FLAG_KTRACE 0x0010 /* output useful kernel trace for debugging */
 
 /*
  * While it would be nice to keep this header clean,  users of older
@@ -22,8 +61,6 @@
  *        with the format above,  except to fix bugs with old format support.
  */
 
-#include <asm/byteorder.h>
-
 #define	OLD_FLAT_VERSION			0x00000002L
 #define OLD_FLAT_RELOC_TYPE_TEXT	0
 #define OLD_FLAT_RELOC_TYPE_DATA	1
diff --git a/include/uapi/linux/flat.h b/include/uapi/linux/flat.h
deleted file mode 100644
index 27e595e44fb7..000000000000
--- a/include/uapi/linux/flat.h
+++ /dev/null
@@ -1,59 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-/*
- * Copyright (C) 2002-2003  David McCullough <davidm@snapgear.com>
- * Copyright (C) 1998       Kenneth Albanowski <kjahds@kjahds.com>
- *                          The Silver Hammer Group, Ltd.
- *
- * This file provides the definitions and structures needed to
- * support uClinux flat-format executables.
- */
-
-#ifndef _UAPI_LINUX_FLAT_H
-#define _UAPI_LINUX_FLAT_H
-
-
-#define	FLAT_VERSION			0x00000004L
-
-#ifdef CONFIG_BINFMT_SHARED_FLAT
-#define	MAX_SHARED_LIBS			(4)
-#else
-#define	MAX_SHARED_LIBS			(1)
-#endif
-
-/*
- * To make everything easier to port and manage cross platform
- * development,  all fields are in network byte order.
- */
-
-struct flat_hdr {
-	char magic[4];
-	unsigned long rev;          /* version (as above) */
-	unsigned long entry;        /* Offset of first executable instruction
-	                               with text segment from beginning of file */
-	unsigned long data_start;   /* Offset of data segment from beginning of
-	                               file */
-	unsigned long data_end;     /* Offset of end of data segment
-	                               from beginning of file */
-	unsigned long bss_end;      /* Offset of end of bss segment from beginning
-	                               of file */
-
-	/* (It is assumed that data_end through bss_end forms the bss segment.) */
-
-	unsigned long stack_size;   /* Size of stack, in bytes */
-	unsigned long reloc_start;  /* Offset of relocation records from
-	                               beginning of file */
-	unsigned long reloc_count;  /* Number of relocation records */
-	unsigned long flags;       
-	unsigned long build_date;   /* When the program/library was built */
-	unsigned long filler[5];    /* Reservered, set to zero */
-};
-
-#define FLAT_FLAG_RAM    0x0001 /* load program entirely into RAM */
-#define FLAT_FLAG_GOTPIC 0x0002 /* program is PIC with GOT */
-#define FLAT_FLAG_GZIP   0x0004 /* all but the header is compressed */
-#define FLAT_FLAG_GZDATA 0x0008 /* only data/relocs are compressed (for XIP) */
-#define FLAT_FLAG_KTRACE 0x0010 /* output useful kernel trace for debugging */
-
-
-
-#endif /* _UAPI_LINUX_FLAT_H */
-- 
2.20.1


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[PATCH 07/17] binfmt_flat: remove the unused OLD_FLAT_FLAG_RAM definition

[Christoph Hellwig]

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/linux/flat.h | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/include/linux/flat.h b/include/linux/flat.h
index 21d901ba191b..2b7cda6e9c1b 100644
--- a/include/linux/flat.h
+++ b/include/linux/flat.h
@@ -72,15 +72,12 @@ typedef union {
 # if defined(mc68000) && !defined(CONFIG_COLDFIRE)
 		signed long offset : 30;
 		unsigned long type : 2;
-#   	define OLD_FLAT_FLAG_RAM    0x1 /* load program entirely into RAM */
 # elif defined(__BIG_ENDIAN_BITFIELD)
 		unsigned long type : 2;
 		signed long offset : 30;
-#   	define OLD_FLAT_FLAG_RAM    0x1 /* load program entirely into RAM */
 # elif defined(__LITTLE_ENDIAN_BITFIELD)
 		signed long offset : 30;
 		unsigned long type : 2;
-#   	define OLD_FLAT_FLAG_RAM    0x1 /* load program entirely into RAM */
 # else
 #   	error "Unknown bitfield order for flat files."
 # endif
-- 
2.20.1


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[PATCH 08/17] binfmt_flat: consolidate two version of flat_v2_reloc_t

[Christoph Hellwig]

Two branches of the ifdef maze actually have the same content, so merge
them.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/linux/flat.h | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/include/linux/flat.h b/include/linux/flat.h
index 2b7cda6e9c1b..19c586b74b99 100644
--- a/include/linux/flat.h
+++ b/include/linux/flat.h
@@ -69,15 +69,13 @@ struct flat_hdr {
 typedef union {
 	unsigned long	value;
 	struct {
-# if defined(mc68000) && !defined(CONFIG_COLDFIRE)
+#if defined(__LITTLE_ENDIAN_BITFIELD) || \
+    (defined(mc68000) && !defined(CONFIG_COLDFIRE))
 		signed long offset : 30;
 		unsigned long type : 2;
 # elif defined(__BIG_ENDIAN_BITFIELD)
 		unsigned long type : 2;
 		signed long offset : 30;
-# elif defined(__LITTLE_ENDIAN_BITFIELD)
-		signed long offset : 30;
-		unsigned long type : 2;
 # else
 #   	error "Unknown bitfield order for flat files."
 # endif
-- 
2.20.1


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Re: [PATCH 08/17] binfmt_flat: consolidate two version of flat_v2_reloc_t

[Al Viro]

On Thu, Jun 13, 2019 at 09:08:54AM +0200, Christoph Hellwig wrote:
> Two branches of the ifdef maze actually have the same content, so merge
> them.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  include/linux/flat.h | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/include/linux/flat.h b/include/linux/flat.h
> index 2b7cda6e9c1b..19c586b74b99 100644
> --- a/include/linux/flat.h
> +++ b/include/linux/flat.h
> @@ -69,15 +69,13 @@ struct flat_hdr {
>  typedef union {
>  	unsigned long	value;
>  	struct {
> -# if defined(mc68000) && !defined(CONFIG_COLDFIRE)
> +#if defined(__LITTLE_ENDIAN_BITFIELD) || \
> +    (defined(mc68000) && !defined(CONFIG_COLDFIRE))
>  		signed long offset : 30;
>  		unsigned long type : 2;
>  # elif defined(__BIG_ENDIAN_BITFIELD)
>  		unsigned long type : 2;
>  		signed long offset : 30;
> -# elif defined(__LITTLE_ENDIAN_BITFIELD)
> -		signed long offset : 30;
> -		unsigned long type : 2;
>  # else
>  #   	error "Unknown bitfield order for flat files."
>  # endif
> -- 
> 2.20.1
> 

FWIW, I wonder if keeping that type is worth bothering.
Something like
old_reloc(__be32 reloc)
{
	u32 v = be32_to_cpu(reloc);
	int offset, type;

#if (defined(mc68000) && !defined(CONFIG_COLDFIRE))
	/* old m68k uses unusual format - type is in lower bits of octet 3 */
	type = v % 4;
	offset = (int)v / 4;
#else
	/* everything else (including coldfire) has it in upper bits of octet 0 */
	type = v >> 30;
	offset = (int)(v << 2) >> 2; /* or (v & 0x1fffffff) - (v & 0x20000000) * 4 */
#endif
	...

and to hell with bitfields, aliasing unions, etc.  Unless I'm misreading
the whole thing, that is...  Greg?

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Re: [PATCH 08/17] binfmt_flat: consolidate two version of flat_v2_reloc_t

[Greg Ungerer]

On 26/6/19 8:29 am, Al Viro wrote:
> On Thu, Jun 13, 2019 at 09:08:54AM +0200, Christoph Hellwig wrote:
>> Two branches of the ifdef maze actually have the same content, so merge
>> them.
>>
>> Signed-off-by: Christoph Hellwig <hch@lst.de>
>> ---
>>   include/linux/flat.h | 6 ++----
>>   1 file changed, 2 insertions(+), 4 deletions(-)
>>
>> diff --git a/include/linux/flat.h b/include/linux/flat.h
>> index 2b7cda6e9c1b..19c586b74b99 100644
>> --- a/include/linux/flat.h
>> +++ b/include/linux/flat.h
>> @@ -69,15 +69,13 @@ struct flat_hdr {
>>   typedef union {
>>   	unsigned long	value;
>>   	struct {
>> -# if defined(mc68000) && !defined(CONFIG_COLDFIRE)
>> +#if defined(__LITTLE_ENDIAN_BITFIELD) || \
>> +    (defined(mc68000) && !defined(CONFIG_COLDFIRE))
>>   		signed long offset : 30;
>>   		unsigned long type : 2;
>>   # elif defined(__BIG_ENDIAN_BITFIELD)
>>   		unsigned long type : 2;
>>   		signed long offset : 30;
>> -# elif defined(__LITTLE_ENDIAN_BITFIELD)
>> -		signed long offset : 30;
>> -		unsigned long type : 2;
>>   # else
>>   #   	error "Unknown bitfield order for flat files."
>>   # endif
>> -- 
>> 2.20.1
>>
> 
> FWIW, I wonder if keeping that type is worth bothering.
> Something like
> old_reloc(__be32 reloc)
> {
> 	u32 v = be32_to_cpu(reloc);
> 	int offset, type;
> 
> #if (defined(mc68000) && !defined(CONFIG_COLDFIRE))
> 	/* old m68k uses unusual format - type is in lower bits of octet 3 */
> 	type = v % 4;
> 	offset = (int)v / 4;
> #else
> 	/* everything else (including coldfire) has it in upper bits of octet 0 */
> 	type = v >> 30;
> 	offset = (int)(v << 2) >> 2; /* or (v & 0x1fffffff) - (v & 0x20000000) * 4 */
> #endif
> 	...
> 
> and to hell with bitfields, aliasing unions, etc.  Unless I'm misreading
> the whole thing, that is...  Greg?

I think you are right. This is much better.
The old mc6800 is the odd one out, the rest have it in network order,
and this makes that much clearer.

Regards
Greg



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Re: [PATCH 08/17] binfmt_flat: consolidate two version of flat_v2_reloc_t

[Geert Uytterhoeven]

Hi Greg,

On Wed, Jun 26, 2019 at 9:23 AM Greg Ungerer <gerg@linux-m68k.org> wrote:
> On 26/6/19 8:29 am, Al Viro wrote:
> > On Thu, Jun 13, 2019 at 09:08:54AM +0200, Christoph Hellwig wrote:
> >> Two branches of the ifdef maze actually have the same content, so merge
> >> them.
> >>
> >> Signed-off-by: Christoph Hellwig <hch@lst.de>
> >> ---
> >>   include/linux/flat.h | 6 ++----
> >>   1 file changed, 2 insertions(+), 4 deletions(-)
> >>
> >> diff --git a/include/linux/flat.h b/include/linux/flat.h
> >> index 2b7cda6e9c1b..19c586b74b99 100644
> >> --- a/include/linux/flat.h
> >> +++ b/include/linux/flat.h
> >> @@ -69,15 +69,13 @@ struct flat_hdr {
> >>   typedef union {
> >>      unsigned long   value;
> >>      struct {
> >> -# if defined(mc68000) && !defined(CONFIG_COLDFIRE)
> >> +#if defined(__LITTLE_ENDIAN_BITFIELD) || \
> >> +    (defined(mc68000) && !defined(CONFIG_COLDFIRE))
> >>              signed long offset : 30;
> >>              unsigned long type : 2;
> >>   # elif defined(__BIG_ENDIAN_BITFIELD)
> >>              unsigned long type : 2;
> >>              signed long offset : 30;
> >> -# elif defined(__LITTLE_ENDIAN_BITFIELD)
> >> -            signed long offset : 30;
> >> -            unsigned long type : 2;
> >>   # else
> >>   #          error "Unknown bitfield order for flat files."
> >>   # endif
> >> --
> >> 2.20.1
> >>
> >
> > FWIW, I wonder if keeping that type is worth bothering.
> > Something like
> > old_reloc(__be32 reloc)
> > {
> >       u32 v = be32_to_cpu(reloc);
> >       int offset, type;
> >
> > #if (defined(mc68000) && !defined(CONFIG_COLDFIRE))
> >       /* old m68k uses unusual format - type is in lower bits of octet 3 */
> >       type = v % 4;
> >       offset = (int)v / 4;
> > #else
> >       /* everything else (including coldfire) has it in upper bits of octet 0 */
> >       type = v >> 30;
> >       offset = (int)(v << 2) >> 2; /* or (v & 0x1fffffff) - (v & 0x20000000) * 4 */
> > #endif
> >       ...
> >
> > and to hell with bitfields, aliasing unions, etc.  Unless I'm misreading
> > the whole thing, that is...  Greg?
>
> I think you are right. This is much better.
> The old mc6800 is the odd one out, the rest have it in network order,
> and this makes that much clearer.

Is that correct for Microblaze, which can be big or little endian?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

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Re: [PATCH 08/17] binfmt_flat: consolidate two version of flat_v2_reloc_t

[Greg Ungerer]

Hi Geert,

On 26/6/19 6:18 pm, Geert Uytterhoeven wrote:
> Hi Greg,
> 
> On Wed, Jun 26, 2019 at 9:23 AM Greg Ungerer <gerg@linux-m68k.org> wrote:
>> On 26/6/19 8:29 am, Al Viro wrote:
>>> On Thu, Jun 13, 2019 at 09:08:54AM +0200, Christoph Hellwig wrote:
>>>> Two branches of the ifdef maze actually have the same content, so merge
>>>> them.
>>>>
>>>> Signed-off-by: Christoph Hellwig <hch@lst.de>
>>>> ---
>>>>    include/linux/flat.h | 6 ++----
>>>>    1 file changed, 2 insertions(+), 4 deletions(-)
>>>>
>>>> diff --git a/include/linux/flat.h b/include/linux/flat.h
>>>> index 2b7cda6e9c1b..19c586b74b99 100644
>>>> --- a/include/linux/flat.h
>>>> +++ b/include/linux/flat.h
>>>> @@ -69,15 +69,13 @@ struct flat_hdr {
>>>>    typedef union {
>>>>       unsigned long   value;
>>>>       struct {
>>>> -# if defined(mc68000) && !defined(CONFIG_COLDFIRE)
>>>> +#if defined(__LITTLE_ENDIAN_BITFIELD) || \
>>>> +    (defined(mc68000) && !defined(CONFIG_COLDFIRE))
>>>>               signed long offset : 30;
>>>>               unsigned long type : 2;
>>>>    # elif defined(__BIG_ENDIAN_BITFIELD)
>>>>               unsigned long type : 2;
>>>>               signed long offset : 30;
>>>> -# elif defined(__LITTLE_ENDIAN_BITFIELD)
>>>> -            signed long offset : 30;
>>>> -            unsigned long type : 2;
>>>>    # else
>>>>    #          error "Unknown bitfield order for flat files."
>>>>    # endif
>>>> --
>>>> 2.20.1
>>>>
>>>
>>> FWIW, I wonder if keeping that type is worth bothering.
>>> Something like
>>> old_reloc(__be32 reloc)
>>> {
>>>        u32 v = be32_to_cpu(reloc);
>>>        int offset, type;
>>>
>>> #if (defined(mc68000) && !defined(CONFIG_COLDFIRE))
>>>        /* old m68k uses unusual format - type is in lower bits of octet 3 */
>>>        type = v % 4;
>>>        offset = (int)v / 4;
>>> #else
>>>        /* everything else (including coldfire) has it in upper bits of octet 0 */
>>>        type = v >> 30;
>>>        offset = (int)(v << 2) >> 2; /* or (v & 0x1fffffff) - (v & 0x20000000) * 4 */
>>> #endif
>>>        ...
>>>
>>> and to hell with bitfields, aliasing unions, etc.  Unless I'm misreading
>>> the whole thing, that is...  Greg?
>>
>> I think you are right. This is much better.
>> The old mc6800 is the odd one out, the rest have it in network order,
>> and this makes that much clearer.
> 
> Is that correct for Microblaze, which can be big or little endian?

It is true for all architectures that use flat. All fields inside a
flat format binary are store in network order.

The final processing of the relocation entries in the elf2flt
converter tool:

    for (i=0; i<reloc_len; i++) reloc[i] = htonl(reloc[i]);

Regards
Greg



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[PATCH 09/17] binfmt_flat: use fixed size type for the on-disk format

[Christoph Hellwig]

So far binfmt_flat has only been supported on 32-bit platforms, so the
variable size of the fields didn't matter.  But the upcoming RISC-V
nommu port supports 64-bit CPUs, and we now have a conflict between
the elf2flt creation tool that always uses 32-bit fields and the kernel
that uses (unsigned) long field.  Switch to the userspace view as the
rest of the binfmt_flat format is completely architecture neutral,
and binfmt_flat isn't the right binary format for huge executables to
start with.

While we're at it also ensure these fields are using __be types as
they big endian and are byte swapped when loaded.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com>
---
 include/linux/flat.h | 44 ++++++++++++++++++++++----------------------
 1 file changed, 22 insertions(+), 22 deletions(-)

diff --git a/include/linux/flat.h b/include/linux/flat.h
index 19c586b74b99..d586bb6e64a7 100644
--- a/include/linux/flat.h
+++ b/include/linux/flat.h
@@ -24,26 +24,26 @@
  */
 
 struct flat_hdr {
-	char magic[4];
-	unsigned long rev;          /* version (as above) */
-	unsigned long entry;        /* Offset of first executable instruction
-	                               with text segment from beginning of file */
-	unsigned long data_start;   /* Offset of data segment from beginning of
-	                               file */
-	unsigned long data_end;     /* Offset of end of data segment
-	                               from beginning of file */
-	unsigned long bss_end;      /* Offset of end of bss segment from beginning
-	                               of file */
+	char	magic[4];
+	__be32	rev;          /* version (as above) */
+	__be32	entry;        /* Offset of first executable instruction
+				 with text segment from beginning of file */
+	__be32	data_start;   /* Offset of data segment from beginning of
+				 file */
+	__be32	data_end;     /* Offset of end of data segment from beginning
+				 of file */
+	__be32	bss_end;      /* Offset of end of bss segment from beginning
+				 of file */
 
 	/* (It is assumed that data_end through bss_end forms the bss segment.) */
 
-	unsigned long stack_size;   /* Size of stack, in bytes */
-	unsigned long reloc_start;  /* Offset of relocation records from
-	                               beginning of file */
-	unsigned long reloc_count;  /* Number of relocation records */
-	unsigned long flags;
-	unsigned long build_date;   /* When the program/library was built */
-	unsigned long filler[5];    /* Reservered, set to zero */
+	__be32	stack_size;   /* Size of stack, in bytes */
+	__be32	reloc_start;  /* Offset of relocation records from beginning of
+				 file */
+	__be32	reloc_count;  /* Number of relocation records */
+	__be32	flags;
+	__be32	build_date;   /* When the program/library was built */
+	__u32	filler[5];    /* Reservered, set to zero */
 };
 
 #define FLAT_FLAG_RAM    0x0001 /* load program entirely into RAM */
@@ -67,15 +67,15 @@ struct flat_hdr {
 #define OLD_FLAT_RELOC_TYPE_BSS		2
 
 typedef union {
-	unsigned long	value;
+	u32		value;
 	struct {
 #if defined(__LITTLE_ENDIAN_BITFIELD) || \
     (defined(mc68000) && !defined(CONFIG_COLDFIRE))
-		signed long offset : 30;
-		unsigned long type : 2;
+		s32	offset : 30;
+		u32	type : 2;
 # elif defined(__BIG_ENDIAN_BITFIELD)
-		unsigned long type : 2;
-		signed long offset : 30;
+		u32	type : 2;
+		s32	offset : 30;
 # else
 #   	error "Unknown bitfield order for flat files."
 # endif
-- 
2.20.1


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[PATCH 10/17] binfmt_flat: add endianess annotations

[Christoph Hellwig]

Most binfmt_flat on-disk fields are big endian.  Use the proper __be32
type where applicable.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Vladimir Murzin <vladimir.murzin@arm.com>
Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com>
---
 fs/binfmt_flat.c | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index b63c5e63ae3f..404a0bedc85b 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -421,7 +421,8 @@ static int load_flat_file(struct linux_binprm *bprm,
 	unsigned long textpos, datapos, realdatastart;
 	u32 text_len, data_len, bss_len, stack_len, full_data, flags;
 	unsigned long len, memp, memp_size, extra, rlim;
-	u32 __user *reloc, *rp;
+	__be32 __user *reloc;
+	u32 __user *rp;
 	struct inode *inode;
 	int i, rev, relocs;
 	loff_t fpos;
@@ -594,7 +595,7 @@ static int load_flat_file(struct linux_binprm *bprm,
 			goto err;
 		}
 
-		reloc = (u32 __user *)
+		reloc = (__be32 __user *)
 			(datapos + (ntohl(hdr->reloc_start) - text_len));
 		memp = realdatastart;
 		memp_size = len;
@@ -619,7 +620,7 @@ static int load_flat_file(struct linux_binprm *bprm,
 				MAX_SHARED_LIBS * sizeof(u32),
 				FLAT_DATA_ALIGN);
 
-		reloc = (u32 __user *)
+		reloc = (__be32 __user *)
 			(datapos + (ntohl(hdr->reloc_start) - text_len));
 		memp = textpos;
 		memp_size = len;
@@ -785,15 +786,16 @@ static int load_flat_file(struct linux_binprm *bprm,
 		u32 __maybe_unused persistent = 0;
 		for (i = 0; i < relocs; i++) {
 			u32 addr, relval;
+			__be32 tmp;
 
 			/*
 			 * Get the address of the pointer to be
 			 * relocated (of course, the address has to be
 			 * relocated first).
 			 */
-			if (get_user(relval, reloc + i))
+			if (get_user(tmp, reloc + i))
 				return -EFAULT;
-			relval = ntohl(relval);
+			relval = ntohl(tmp);
 			addr = flat_get_relocate_addr(relval);
 			rp = (u32 __user *)calc_reloc(addr, libinfo, id, 1);
 			if (rp == (u32 __user *)RELOC_FAILED) {
@@ -812,8 +814,13 @@ static int load_flat_file(struct linux_binprm *bprm,
 				 * Do the relocation.  PIC relocs in the data section are
 				 * already in target order
 				 */
-				if ((flags & FLAT_FLAG_GOTPIC) == 0)
-					addr = ntohl(addr);
+				if ((flags & FLAT_FLAG_GOTPIC) == 0) {
+					/*
+					 * Meh, the same value can have a different
+					 * byte order based on a flag..
+					 */
+					addr = ntohl((__force __be32)addr);
+				}
 				addr = calc_reloc(addr, libinfo, id, 0);
 				if (addr == RELOC_FAILED) {
 					ret = -ENOEXEC;
@@ -828,11 +835,10 @@ static int load_flat_file(struct linux_binprm *bprm,
 		}
 	} else {
 		for (i = 0; i < relocs; i++) {
-			u32 relval;
+			__be32 relval;
 			if (get_user(relval, reloc + i))
 				return -EFAULT;
-			relval = ntohl(relval);
-			old_reloc(relval);
+			old_reloc(ntohl(relval));
 		}
 	}
 
-- 
2.20.1


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[PATCH 11/17] binfmt_flat: add a ARCH_HAS_BINFMT_FLAT option

[Christoph Hellwig]

Allow architectures to opt into ARCH_HAS_BINFMT_FLAT support instead of
assuming that all nommu ports support the format.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com>
---
 arch/arm/Kconfig        | 1 +
 arch/c6x/Kconfig        | 1 +
 arch/h8300/Kconfig      | 1 +
 arch/m68k/Kconfig       | 1 +
 arch/microblaze/Kconfig | 1 +
 arch/sh/Kconfig         | 1 +
 arch/xtensa/Kconfig     | 1 +
 fs/Kconfig.binfmt       | 5 ++++-
 8 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index b1b48c0bde76..695a26c68064 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -4,6 +4,7 @@ config ARM
 	default y
 	select ARCH_32BIT_OFF_T
 	select ARCH_CLOCKSOURCE_DATA
+	select ARCH_HAS_BINFMT_FLAT
 	select ARCH_HAS_DEBUG_VIRTUAL if MMU
 	select ARCH_HAS_DEVMEM_IS_ALLOWED
 	select ARCH_HAS_ELF_RANDOMIZE
diff --git a/arch/c6x/Kconfig b/arch/c6x/Kconfig
index eeb0471268a0..78dfe186d708 100644
--- a/arch/c6x/Kconfig
+++ b/arch/c6x/Kconfig
@@ -7,6 +7,7 @@
 config C6X
 	def_bool y
 	select ARCH_32BIT_OFF_T
+	select ARCH_HAS_BINFMT_FLAT
 	select ARCH_HAS_SYNC_DMA_FOR_CPU
 	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
 	select CLKDEV_LOOKUP
diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
index 7457f190caaa..ec800e9d5aad 100644
--- a/arch/h8300/Kconfig
+++ b/arch/h8300/Kconfig
@@ -2,6 +2,7 @@
 config H8300
         def_bool y
 	select ARCH_32BIT_OFF_T
+	select ARCH_HAS_BINFMT_FLAT
 	select BINFMT_FLAT_ARGVP_ENVP_ON_STACK
 	select BINFMT_FLAT_OLD_ALWAYS_RAM
 	select GENERIC_ATOMIC64
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index fd69ee5ad6ab..c0c43c624afa 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -3,6 +3,7 @@ config M68K
 	bool
 	default y
 	select ARCH_32BIT_OFF_T
+	select ARCH_HAS_BINFMT_FLAT
 	select ARCH_HAS_SYNC_DMA_FOR_DEVICE if HAS_DMA
 	select ARCH_MIGHT_HAVE_PC_PARPORT if ISA
 	select ARCH_NO_COHERENT_DMA_MMAP if !MMU
diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index f11433daab4a..d411de05b628 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -3,6 +3,7 @@ config MICROBLAZE
 	def_bool y
 	select ARCH_32BIT_OFF_T
 	select ARCH_NO_SWAP
+	select ARCH_HAS_BINFMT_FLAT if !MMU
 	select ARCH_HAS_DMA_COHERENT_TO_PFN if MMU
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_SYNC_DMA_FOR_CPU
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index b77f512bb176..df3e6215b78c 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 config SUPERH
 	def_bool y
+	select ARCH_HAS_BINFMT_FLAT if !MMU
 	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
 	select ARCH_MIGHT_HAVE_PC_PARPORT
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 6ec1b75eabc5..ebc135bda921 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -2,6 +2,7 @@
 config XTENSA
 	def_bool y
 	select ARCH_32BIT_OFF_T
+	select ARCH_HAS_BINFMT_FLAT if !MMU
 	select ARCH_HAS_SYNC_DMA_FOR_CPU
 	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
 	select ARCH_NO_COHERENT_DMA_MMAP if !MMU
diff --git a/fs/Kconfig.binfmt b/fs/Kconfig.binfmt
index 82f7d7f234f3..286b425b30b9 100644
--- a/fs/Kconfig.binfmt
+++ b/fs/Kconfig.binfmt
@@ -91,9 +91,12 @@ config BINFMT_SCRIPT
 
 	  Most systems will not boot if you say M or N here.  If unsure, say Y.
 
+config ARCH_HAS_BINFMT_FLAT
+	bool
+
 config BINFMT_FLAT
 	bool "Kernel support for flat binaries"
-	depends on !MMU || ARM || M68K
+	depends on ARCH_HAS_BINFMT_FLAT
 	help
 	  Support uClinux FLAT format binaries.
 
-- 
2.20.1


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[PATCH 12/17] binfmt_flat: make support for old format binaries optional

[Christoph Hellwig]

No need to carry the extra code around, given that systems using flat
binaries are generally very resource constrained.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/Kconfig.binfmt |  7 +++++++
 fs/binfmt_flat.c  | 30 ++++++++++++++++++++++--------
 2 files changed, 29 insertions(+), 8 deletions(-)

diff --git a/fs/Kconfig.binfmt b/fs/Kconfig.binfmt
index 286b425b30b9..62dc4f577ba1 100644
--- a/fs/Kconfig.binfmt
+++ b/fs/Kconfig.binfmt
@@ -106,6 +106,13 @@ config BINFMT_FLAT_ARGVP_ENVP_ON_STACK
 config BINFMT_FLAT_OLD_ALWAYS_RAM
 	bool
 
+config BINFMT_FLAT_OLD
+	bool "Enable support for very old legacy flat binaries"
+	depends on BINFMT_FLAT
+	help
+	  Support decade old uClinux FLAT format binaries.  Unless you know
+	  you have some of those say N here.
+
 config BINFMT_ZFLAT
 	bool "Enable ZFLAT support"
 	depends on BINFMT_FLAT
diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index 404a0bedc85b..1e88f4e62e65 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -374,6 +374,7 @@ calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp)
 
 /****************************************************************************/
 
+#ifdef CONFIG_BINFMT_FLAT_OLD
 static void old_reloc(unsigned long rl)
 {
 	static const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
@@ -411,6 +412,7 @@ static void old_reloc(unsigned long rl)
 
 	pr_debug("Relocation became %lx\n", val);
 }
+#endif /* CONFIG_BINFMT_FLAT_OLD */
 
 /****************************************************************************/
 
@@ -461,6 +463,7 @@ static int load_flat_file(struct linux_binprm *bprm,
 	if (flags & FLAT_FLAG_KTRACE)
 		pr_info("Loading file: %s\n", bprm->filename);
 
+#ifdef CONFIG_BINFMT_FLAT_OLD
 	if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
 		pr_err("bad flat file version 0x%x (supported 0x%lx and 0x%lx)\n",
 		       rev, FLAT_VERSION, OLD_FLAT_VERSION);
@@ -476,6 +479,23 @@ static int load_flat_file(struct linux_binprm *bprm,
 		goto err;
 	}
 
+	/*
+	 * fix up the flags for the older format,  there were all kinds
+	 * of endian hacks,  this only works for the simple cases
+	 */
+	if (rev == OLD_FLAT_VERSION &&
+	   (flags || IS_ENABLED(CONFIG_BINFMT_FLAT_OLD_ALWAYS_RAM)))
+		flags = FLAT_FLAG_RAM;
+
+#else /* CONFIG_BINFMT_FLAT_OLD */
+	if (rev != FLAT_VERSION) {
+		pr_err("bad flat file version 0x%x (supported 0x%lx)\n",
+		       rev, FLAT_VERSION);
+		ret = -ENOEXEC;
+		goto err;
+	}
+#endif /* !CONFIG_BINFMT_FLAT_OLD */
+
 	/*
 	 * Make sure the header params are sane.
 	 * 28 bits (256 MB) is way more than reasonable in this case.
@@ -487,14 +507,6 @@ static int load_flat_file(struct linux_binprm *bprm,
 		goto err;
 	}
 
-	/*
-	 * fix up the flags for the older format,  there were all kinds
-	 * of endian hacks,  this only works for the simple cases
-	 */
-	if (rev == OLD_FLAT_VERSION &&
-	   (flags || IS_ENABLED(CONFIG_BINFMT_FLAT_OLD_ALWAYS_RAM)))
-		flags = FLAT_FLAG_RAM;
-
 #ifndef CONFIG_BINFMT_ZFLAT
 	if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
 		pr_err("Support for ZFLAT executables is not enabled.\n");
@@ -833,6 +845,7 @@ static int load_flat_file(struct linux_binprm *bprm,
 					goto err;
 			}
 		}
+#ifdef CONFIG_BINFMT_FLAT_OLD
 	} else {
 		for (i = 0; i < relocs; i++) {
 			__be32 relval;
@@ -840,6 +853,7 @@ static int load_flat_file(struct linux_binprm *bprm,
 				return -EFAULT;
 			old_reloc(ntohl(relval));
 		}
+#endif /* CONFIG_BINFMT_FLAT_OLD */
 	}
 
 	flush_icache_range(start_code, end_code);
-- 
2.20.1


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[PATCH 13/17] binfmt_flat: provide an asm-generic/flat.h

[Christoph Hellwig]

This file implements the flat get/put reloc helpers for architectures
that do not need to overload the relocs by simply using get_user/put_user.

Note that many nommu architectures currently use {get,put}_unaligned, which
looks a little bogus and should probably later be switched over to this
version as well.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com>
---
 arch/arm/include/asm/Kbuild                   |  1 +
 arch/m68k/include/asm/flat.h                  | 21 +------------------
 .../asm => include/asm-generic}/flat.h        | 12 ++++-------
 3 files changed, 6 insertions(+), 28 deletions(-)
 rename {arch/arm/include/asm => include/asm-generic}/flat.h (73%)

diff --git a/arch/arm/include/asm/Kbuild b/arch/arm/include/asm/Kbuild
index a8f149ab45b8..6b2dc15b6dff 100644
--- a/arch/arm/include/asm/Kbuild
+++ b/arch/arm/include/asm/Kbuild
@@ -5,6 +5,7 @@ generic-y += early_ioremap.h
 generic-y += emergency-restart.h
 generic-y += exec.h
 generic-y += extable.h
+generic-y += flat.h
 generic-y += irq_regs.h
 generic-y += kdebug.h
 generic-y += local.h
diff --git a/arch/m68k/include/asm/flat.h b/arch/m68k/include/asm/flat.h
index d7102fcd43eb..46379e08cdd6 100644
--- a/arch/m68k/include/asm/flat.h
+++ b/arch/m68k/include/asm/flat.h
@@ -6,26 +6,7 @@
 #ifndef __M68KNOMMU_FLAT_H__
 #define __M68KNOMMU_FLAT_H__
 
-#include <linux/uaccess.h>
-
-static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
-					u32 *addr, u32 *persistent)
-{
-#ifdef CONFIG_CPU_HAS_NO_UNALIGNED
-	return copy_from_user(addr, rp, 4) ? -EFAULT : 0;
-#else
-	return get_user(*addr, rp);
-#endif
-}
-
-static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel)
-{
-#ifdef CONFIG_CPU_HAS_NO_UNALIGNED
-	return copy_to_user(rp, &addr, 4) ? -EFAULT : 0;
-#else
-	return put_user(addr, rp);
-#endif
-}
+#include <asm-generic/flat.h>
 
 #define FLAT_PLAT_INIT(regs) \
 	do { \
diff --git a/arch/arm/include/asm/flat.h b/include/asm-generic/flat.h
similarity index 73%
rename from arch/arm/include/asm/flat.h
rename to include/asm-generic/flat.h
index bbc27901446f..fcd2b45c0735 100644
--- a/arch/arm/include/asm/flat.h
+++ b/include/asm-generic/flat.h
@@ -1,15 +1,11 @@
 /* SPDX-License-Identifier: GPL-2.0 */
-/*
- * arch/arm/include/asm/flat.h -- uClinux flat-format executables
- */
-
-#ifndef __ARM_FLAT_H__
-#define __ARM_FLAT_H__
+#ifndef _ASM_GENERIC_FLAT_H
+#define _ASM_GENERIC_FLAT_H
 
 #include <linux/uaccess.h>
 
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
-					u32 *addr, u32 *persistent)
+		u32 *addr, u32 *persistent)
 {
 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
 	return copy_from_user(addr, rp, 4) ? -EFAULT : 0;
@@ -27,4 +23,4 @@ static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel)
 #endif
 }
 
-#endif /* __ARM_FLAT_H__ */
+#endif /* _ASM_GENERIC_FLAT_H */
-- 
2.20.1


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[PATCH 14/17] binfmt_flat: remove the persistent argument from flat_get_addr_from_rp

[Christoph Hellwig]

The argument is never used.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/c6x/include/asm/flat.h        | 2 +-
 arch/h8300/include/asm/flat.h      | 2 +-
 arch/microblaze/include/asm/flat.h | 2 +-
 arch/sh/include/asm/flat.h         | 2 +-
 arch/xtensa/include/asm/flat.h     | 2 +-
 fs/binfmt_flat.c                   | 4 +---
 include/asm-generic/flat.h         | 2 +-
 7 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/arch/c6x/include/asm/flat.h b/arch/c6x/include/asm/flat.h
index 2d57a9204d21..9e6544b51386 100644
--- a/arch/c6x/include/asm/flat.h
+++ b/arch/c6x/include/asm/flat.h
@@ -5,7 +5,7 @@
 #include <asm/unaligned.h>
 
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
-					u32 *addr, u32 *persistent)
+					u32 *addr)
 {
 	*addr = get_unaligned((__force u32 *)rp);
 	return 0;
diff --git a/arch/h8300/include/asm/flat.h b/arch/h8300/include/asm/flat.h
index 4683146f0e9e..78070f924177 100644
--- a/arch/h8300/include/asm/flat.h
+++ b/arch/h8300/include/asm/flat.h
@@ -17,7 +17,7 @@
 
 #define	flat_get_relocate_addr(rel)		(rel & ~0x00000001)
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
-					u32 *addr, u32 *persistent)
+					u32 *addr)
 {
 	u32 val = get_unaligned((__force u32 *)rp);
 	if (!(flags & FLAT_FLAG_GOTPIC))
diff --git a/arch/microblaze/include/asm/flat.h b/arch/microblaze/include/asm/flat.h
index 9e3d8e01d294..1ab86770eaee 100644
--- a/arch/microblaze/include/asm/flat.h
+++ b/arch/microblaze/include/asm/flat.h
@@ -28,7 +28,7 @@
  */
 
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
-					u32 *addr, u32 *persistent)
+					u32 *addr)
 {
 	u32 *p = (__force u32 *)rp;
 
diff --git a/arch/sh/include/asm/flat.h b/arch/sh/include/asm/flat.h
index 1002343dd84a..fee4f25555cb 100644
--- a/arch/sh/include/asm/flat.h
+++ b/arch/sh/include/asm/flat.h
@@ -12,7 +12,7 @@
 #include <asm/unaligned.h>
 
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
-					u32 *addr, u32 *persistent)
+					u32 *addr)
 {
 	*addr = get_unaligned((__force u32 *)rp);
 	return 0;
diff --git a/arch/xtensa/include/asm/flat.h b/arch/xtensa/include/asm/flat.h
index 3d357371b28b..ed5870c779f9 100644
--- a/arch/xtensa/include/asm/flat.h
+++ b/arch/xtensa/include/asm/flat.h
@@ -5,7 +5,7 @@
 #include <asm/unaligned.h>
 
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
-					u32 *addr, u32 *persistent)
+					u32 *addr)
 {
 	*addr = get_unaligned((__force u32 *)rp);
 	return 0;
diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index 1e88f4e62e65..0ca65d51bb01 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -795,7 +795,6 @@ static int load_flat_file(struct linux_binprm *bprm,
 	 * __start to address 4 so that is okay).
 	 */
 	if (rev > OLD_FLAT_VERSION) {
-		u32 __maybe_unused persistent = 0;
 		for (i = 0; i < relocs; i++) {
 			u32 addr, relval;
 			__be32 tmp;
@@ -816,8 +815,7 @@ static int load_flat_file(struct linux_binprm *bprm,
 			}
 
 			/* Get the pointer's value.  */
-			ret = flat_get_addr_from_rp(rp, relval, flags,
-							&addr, &persistent);
+			ret = flat_get_addr_from_rp(rp, relval, flags, &addr);
 			if (unlikely(ret))
 				goto err;
 
diff --git a/include/asm-generic/flat.h b/include/asm-generic/flat.h
index fcd2b45c0735..1928a3596938 100644
--- a/include/asm-generic/flat.h
+++ b/include/asm-generic/flat.h
@@ -5,7 +5,7 @@
 #include <linux/uaccess.h>
 
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
-		u32 *addr, u32 *persistent)
+		u32 *addr)
 {
 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
 	return copy_from_user(addr, rp, 4) ? -EFAULT : 0;
-- 
2.20.1


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[PATCH 15/17] binfmt_flat: move the MAX_SHARED_LIBS definition to binfmt_flat.c

[Christoph Hellwig]

MAX_SHARED_LIBS is an implementation detail of the kernel loader,
and should be kept away from the file format definition.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/binfmt_flat.c     | 6 ++++++
 include/linux/flat.h | 6 ------
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index 0ca65d51bb01..ccd9843e979e 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -68,6 +68,12 @@
 #define RELOC_FAILED 0xff00ff01		/* Relocation incorrect somewhere */
 #define UNLOADED_LIB 0x7ff000ff		/* Placeholder for unused library */
 
+#ifdef CONFIG_BINFMT_SHARED_FLAT
+#define	MAX_SHARED_LIBS			(4)
+#else
+#define	MAX_SHARED_LIBS			(1)
+#endif
+
 struct lib_info {
 	struct {
 		unsigned long start_code;		/* Start of text segment */
diff --git a/include/linux/flat.h b/include/linux/flat.h
index d586bb6e64a7..83977c0ce3de 100644
--- a/include/linux/flat.h
+++ b/include/linux/flat.h
@@ -12,12 +12,6 @@
 
 #define	FLAT_VERSION			0x00000004L
 
-#ifdef CONFIG_BINFMT_SHARED_FLAT
-#define	MAX_SHARED_LIBS			(4)
-#else
-#define	MAX_SHARED_LIBS			(1)
-#endif
-
 /*
  * To make everything easier to port and manage cross platform
  * development,  all fields are in network byte order.
-- 
2.20.1


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Re: [PATCH 15/17] binfmt_flat: move the MAX_SHARED_LIBS definition to binfmt_flat.c

[Sergei Shtylyov]

Hello!

On 13.06.2019 10:09, Christoph Hellwig wrote:

> MAX_SHARED_LIBS is an implementation detail of the kernel loader,
> and should be kept away from the file format definition.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>   fs/binfmt_flat.c     | 6 ++++++
>   include/linux/flat.h | 6 ------
>   2 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
> index 0ca65d51bb01..ccd9843e979e 100644
> --- a/fs/binfmt_flat.c
> +++ b/fs/binfmt_flat.c
> @@ -68,6 +68,12 @@
>   #define RELOC_FAILED 0xff00ff01		/* Relocation incorrect somewhere */
>   #define UNLOADED_LIB 0x7ff000ff		/* Placeholder for unused library */
>   
> +#ifdef CONFIG_BINFMT_SHARED_FLAT
> +#define	MAX_SHARED_LIBS			(4)
> +#else
> +#define	MAX_SHARED_LIBS			(1)
> +#endif

    Perhaps the time to remove ()?

[...]

MBR, Sergei

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[PATCH 16/17] binfmt_flat: don't offset the data start

[Christoph Hellwig]

Ever since the initial commit of the binfmt_flat shared library
support back in the bitkeeper days we've offset the actual in-memory
.data start by one field per possible shared library, or 1 in case
shared library support isn't enabled.  I can't find anything in the
loader that actually makes use of it, nor was it present before
shared library support it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/binfmt_flat.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index ccd9843e979e..80d902fb46e3 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -573,7 +573,7 @@ static int load_flat_file(struct linux_binprm *bprm,
 			goto err;
 		}
 
-		len = data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long);
+		len = data_len + extra;
 		len = PAGE_ALIGN(len);
 		realdatastart = vm_mmap(NULL, 0, len,
 			PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0);
@@ -587,9 +587,7 @@ static int load_flat_file(struct linux_binprm *bprm,
 			vm_munmap(textpos, text_len);
 			goto err;
 		}
-		datapos = ALIGN(realdatastart +
-				MAX_SHARED_LIBS * sizeof(unsigned long),
-				FLAT_DATA_ALIGN);
+		datapos = ALIGN(realdatastart, FLAT_DATA_ALIGN);
 
 		pr_debug("Allocated data+bss+stack (%u bytes): %lx\n",
 			 data_len + bss_len + stack_len, datapos);
@@ -619,7 +617,7 @@ static int load_flat_file(struct linux_binprm *bprm,
 		memp_size = len;
 	} else {
 
-		len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(u32);
+		len = text_len + data_len + extra;
 		len = PAGE_ALIGN(len);
 		textpos = vm_mmap(NULL, 0, len,
 			PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0);
@@ -634,9 +632,7 @@ static int load_flat_file(struct linux_binprm *bprm,
 		}
 
 		realdatastart = textpos + ntohl(hdr->data_start);
-		datapos = ALIGN(realdatastart +
-				MAX_SHARED_LIBS * sizeof(u32),
-				FLAT_DATA_ALIGN);
+		datapos = ALIGN(realdatastart, FLAT_DATA_ALIGN);
 
 		reloc = (__be32 __user *)
 			(datapos + (ntohl(hdr->reloc_start) - text_len));
@@ -653,8 +649,9 @@ static int load_flat_file(struct linux_binprm *bprm,
 					 (text_len + full_data
 						  - sizeof(struct flat_hdr)),
 					 0);
-			memmove((void *) datapos, (void *) realdatastart,
-					full_data);
+			if (datapos != realdatastart)
+				memmove((void *)datapos, (void *)realdatastart,
+						full_data);
 #else
 			/*
 			 * This is used on MMU systems mainly for testing.
@@ -710,8 +707,7 @@ static int load_flat_file(struct linux_binprm *bprm,
 		if (IS_ERR_VALUE(result)) {
 			ret = result;
 			pr_err("Unable to read code+data+bss, errno %d\n", ret);
-			vm_munmap(textpos, text_len + data_len + extra +
-				MAX_SHARED_LIBS * sizeof(u32));
+			vm_munmap(textpos, text_len + data_len + extra);
 			goto err;
 		}
 	}
-- 
2.20.1


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[PATCH 17/17] riscv: add binfmt_flat support

[Christoph Hellwig]

Just use the generic definitions.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/riscv/Kconfig            | 1 +
 arch/riscv/include/asm/Kbuild | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 0c4b12205632..2c19baa8d6c3 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -17,6 +17,7 @@ config RISCV
 	select OF
 	select OF_EARLY_FLATTREE
 	select OF_IRQ
+	select ARCH_HAS_BINFMT_FLAT
 	select ARCH_WANT_FRAME_POINTERS
 	select CLONE_BACKWARDS
 	select COMMON_CLK
diff --git a/arch/riscv/include/asm/Kbuild b/arch/riscv/include/asm/Kbuild
index 5ee646619cc3..1efaeddf1e4b 100644
--- a/arch/riscv/include/asm/Kbuild
+++ b/arch/riscv/include/asm/Kbuild
@@ -5,6 +5,7 @@ generic-y += compat.h
 generic-y += device.h
 generic-y += div64.h
 generic-y += extable.h
+generic-y += flat.h
 generic-y += dma.h
 generic-y += dma-contiguous.h
 generic-y += dma-mapping.h
-- 
2.20.1


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Re: binfmt_flat cleanups and RISC-V support v2

[Greg Ungerer]

Hi Christoph,

On 13/6/19 5:08 pm, Christoph Hellwig wrote:
> below is a larger stash of cleanups for the binfmt_misc code,
> preparing for the last patch that now trivially adds RISC-V
> support, which will be used for the RISC-V nommu series I am
> about to post.
> 
> Changes since v2:
>   - fix the handling of old format flags
>   - don't pass arguments on stack for RISC-V
>   - small cleanups for flat_v2_reloc_t

Thanks for doing this work. Tested and works for me on
m68k/Coldfire too.

I have pushed these onto the for-next branch of the
m68knommu git tree.

Regards
Greg



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