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binfmt_flat: replace flat_argvp_envp_on_stack with a Kconfig variable

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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>
Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
This commit is contained in:
Christoph Hellwig 2019-06-13 09:08:51 +02:00 committed by Greg Ungerer
parent 1d52dca117
commit bdd15a2884
12 changed files with 9 additions and 12 deletions
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1
arch/arm/Kconfig
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@ -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

2
arch/arm/include/asm/flat.h
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@ -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)
{

1
arch/c6x/include/asm/flat.h
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@ -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)
{

1
arch/h8300/Kconfig
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@ -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

2
arch/h8300/include/asm/flat.h
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@ -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

1
arch/m68k/Kconfig
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@ -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

1
arch/m68k/include/asm/flat.h
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@ -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)
{

2
arch/microblaze/include/asm/flat.h
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@ -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

1
arch/sh/include/asm/flat.h
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@ -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)
{

1
arch/xtensa/include/asm/flat.h
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@ -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)
{

3
fs/Kconfig.binfmt
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@ -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

5
fs/binfmt_flat.c
View File

@ -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);