Re: [PATCH 05/15] binfmt_flat: replace flat_argvp_envp_on_stack with a Kconfig variable

[Vladimir Murzin]

On 6/10/19 10:20 PM, Christoph Hellwig wrote:
> This will eventually allow us to kill the need for an <asm/flat.h> for
> many cases.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
>  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(-)
>

For ARM bits:

Tested-by: Vladimir Murzin <vladimir.murzin@xxxxxxx>
Reviewed-by: Vladimir Murzin <vladimir.murzin@xxxxxxx>


> 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>
>
> -#defineflat_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>
>
> -#defineflat_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>
>
> -#defineflat_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>
>
> -#defineflat_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>
>
> -#defineflat_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 18d82fd5f57c..c09651087eda 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);
>

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