Re: [PATCH v6 2/6] syscall.h: add syscall_set_arguments()

["Maciej W. Rozycki" <macro@orcam.me.uk>]

On Mon, 17 Feb 2025, Dmitry V. Levin wrote:

> This function is going to be needed on all HAVE_ARCH_TRACEHOOK
> architectures to implement PTRACE_SET_SYSCALL_INFO API.
> 
> This partially reverts commit 7962c2eddbfe ("arch: remove unused
> function syscall_set_arguments()") by reusing some of old
> syscall_set_arguments() implementations.
> 
> Signed-off-by: Dmitry V. Levin <ldv@strace.io>
> Tested-by: Charlie Jenkins <charlie@rivosinc.com>
> Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
> Acked-by: Helge Deller <deller@gmx.de> # parisc
> ---
>  arch/arc/include/asm/syscall.h        | 14 +++++++++++
>  arch/arm/include/asm/syscall.h        | 13 ++++++++++
>  arch/arm64/include/asm/syscall.h      | 13 ++++++++++
>  arch/csky/include/asm/syscall.h       | 13 ++++++++++
>  arch/hexagon/include/asm/syscall.h    |  7 ++++++
>  arch/loongarch/include/asm/syscall.h  |  8 ++++++
>  arch/mips/include/asm/syscall.h       | 32 ++++++++++++++++++++++++
>  arch/nios2/include/asm/syscall.h      | 11 ++++++++
>  arch/openrisc/include/asm/syscall.h   |  7 ++++++
>  arch/parisc/include/asm/syscall.h     | 12 +++++++++
>  arch/powerpc/include/asm/syscall.h    | 10 ++++++++
>  arch/riscv/include/asm/syscall.h      |  9 +++++++
>  arch/s390/include/asm/syscall.h       |  9 +++++++
>  arch/sh/include/asm/syscall_32.h      | 12 +++++++++
>  arch/sparc/include/asm/syscall.h      | 10 ++++++++
>  arch/um/include/asm/syscall-generic.h | 14 +++++++++++
>  arch/x86/include/asm/syscall.h        | 36 +++++++++++++++++++++++++++
>  arch/xtensa/include/asm/syscall.h     | 11 ++++++++
>  include/asm-generic/syscall.h         | 16 ++++++++++++
>  19 files changed, 257 insertions(+)
> 
> diff --git a/arch/arc/include/asm/syscall.h b/arch/arc/include/asm/syscall.h
> index 9709256e31c8..89c1e1736356 100644
> --- a/arch/arc/include/asm/syscall.h
> +++ b/arch/arc/include/asm/syscall.h
> @@ -67,6 +67,20 @@ syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
>  	}
>  }
>  
> +static inline void
> +syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
> +		      unsigned long *args)
> +{
> +	unsigned long *inside_ptregs = &regs->r0;
> +	unsigned int n = 6;
> +	unsigned int i = 0;
> +
> +	while (n--) {
> +		*inside_ptregs = args[i++];
> +		inside_ptregs--;
> +	}
> +}
> +
>  static inline int
>  syscall_get_arch(struct task_struct *task)
>  {
> diff --git a/arch/arm/include/asm/syscall.h b/arch/arm/include/asm/syscall.h
> index fe4326d938c1..21927fa0ae2b 100644
> --- a/arch/arm/include/asm/syscall.h
> +++ b/arch/arm/include/asm/syscall.h
> @@ -80,6 +80,19 @@ static inline void syscall_get_arguments(struct task_struct *task,
>  	memcpy(args, &regs->ARM_r0 + 1, 5 * sizeof(args[0]));
>  }
>  
> +static inline void syscall_set_arguments(struct task_struct *task,
> +					 struct pt_regs *regs,
> +					 const unsigned long *args)
> +{
> +	memcpy(&regs->ARM_r0, args, 6 * sizeof(args[0]));
> +	/*
> +	 * Also copy the first argument into ARM_ORIG_r0
> +	 * so that syscall_get_arguments() would return it
> +	 * instead of the previous value.
> +	 */
> +	regs->ARM_ORIG_r0 = regs->ARM_r0;
> +}
> +
>  static inline int syscall_get_arch(struct task_struct *task)
>  {
>  	/* ARM tasks don't change audit architectures on the fly. */
> diff --git a/arch/arm64/include/asm/syscall.h b/arch/arm64/include/asm/syscall.h
> index ab8e14b96f68..76020b66286b 100644
> --- a/arch/arm64/include/asm/syscall.h
> +++ b/arch/arm64/include/asm/syscall.h
> @@ -73,6 +73,19 @@ static inline void syscall_get_arguments(struct task_struct *task,
>  	memcpy(args, &regs->regs[1], 5 * sizeof(args[0]));
>  }
>  
> +static inline void syscall_set_arguments(struct task_struct *task,
> +					 struct pt_regs *regs,
> +					 const unsigned long *args)
> +{
> +	memcpy(&regs->regs[0], args, 6 * sizeof(args[0]));
> +	/*
> +	 * Also copy the first argument into orig_x0
> +	 * so that syscall_get_arguments() would return it
> +	 * instead of the previous value.
> +	 */
> +	regs->orig_x0 = regs->regs[0];
> +}
> +
>  /*
>   * We don't care about endianness (__AUDIT_ARCH_LE bit) here because
>   * AArch64 has the same system calls both on little- and big- endian.
> diff --git a/arch/csky/include/asm/syscall.h b/arch/csky/include/asm/syscall.h
> index 0de5734950bf..30403f7a0487 100644
> --- a/arch/csky/include/asm/syscall.h
> +++ b/arch/csky/include/asm/syscall.h
> @@ -59,6 +59,19 @@ syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
>  	memcpy(args, &regs->a1, 5 * sizeof(args[0]));
>  }
>  
> +static inline void
> +syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
> +		      const unsigned long *args)
> +{
> +	memcpy(&regs->a0, args, 6 * sizeof(regs->a0));
> +	/*
> +	 * Also copy the first argument into orig_x0
                                                  ^
 Typo here, s/orig_x0/orig_a0/; see below.

> +	 * so that syscall_get_arguments() would return it
> +	 * instead of the previous value.
> +	 */
> +	regs->orig_a0 = regs->a0;

 Also:

> diff --git a/arch/mips/include/asm/syscall.h b/arch/mips/include/asm/syscall.h
> index 056aa1b713e2..ea050b23d428 100644
> --- a/arch/mips/include/asm/syscall.h
> +++ b/arch/mips/include/asm/syscall.h
> @@ -120,6 +137,21 @@ static inline void syscall_get_arguments(struct task_struct *task,
>  		mips_get_syscall_arg(args++, task, regs, i++);
>  }
>  
> +static inline void syscall_set_arguments(struct task_struct *task,
> +					 struct pt_regs *regs,
> +					 unsigned long *args)
> +{
> +	unsigned int i = 0;
> +	unsigned int n = 6;
> +
> +	/* O32 ABI syscall() */
> +	if (mips_syscall_is_indirect(task, regs))
> +		i++;

-- given MIPS syscall_set_nr() implementation in 3/6 this conditional is 
supposed to never be true.  Should it be BUG_ON() or discarded entirely?

> +
> +	while (n--)
> +		mips_set_syscall_arg(args++, task, regs, i++);
> +}
> +
>  extern const unsigned long sys_call_table[];
>  extern const unsigned long sys32_call_table[];
>  extern const unsigned long sysn32_call_table[];

  Maciej