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SubjectRe: [PATCH] sys_personality: Add a optional arch hook arch_check_personality()
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I am sorry for sending a wrong version, the correct version is v2.

在 2019/12/28 16:43, Wang ShaoBo 写道:
> currently arm64 use __arm64_sys_arm64_personality() as its default
> syscall. Now using a normal hook arch_check_personality() can reject
> personality settings for special case of different archs.
>
> Signed-off-by: Wang ShaoBo <bobo.shaobowang@huawei.com>
> ---
> arch/arm64/kernel/sys.c | 6 +++---
> kernel/exec_domain.c | 11 +++++++++++
> 2 files changed, 14 insertions(+), 3 deletions(-)
>
> diff --git a/arch/arm64/kernel/sys.c b/arch/arm64/kernel/sys.c
> index d5ffaaab31a7..751fbd57eb1e 100644
> --- a/arch/arm64/kernel/sys.c
> +++ b/arch/arm64/kernel/sys.c
> @@ -28,12 +28,13 @@ SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
> return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
> }
>
> -SYSCALL_DEFINE1(arm64_personality, unsigned int, personality)
> +int arch_check_personality(unsigned int personality)
> {
> if (personality(personality) == PER_LINUX32 &&
> !system_supports_32bit_el0())
> return -EINVAL;
> - return ksys_personality(personality);
> +
> + return 0;
> }
>
> asmlinkage long sys_ni_syscall(void);
> @@ -46,7 +47,6 @@ asmlinkage long __arm64_sys_ni_syscall(const struct pt_regs *__unused)
> /*
> * Wrappers to pass the pt_regs argument.
> */
> -#define __arm64_sys_personality __arm64_sys_arm64_personality
>
> #undef __SYSCALL
> #define __SYSCALL(nr, sym) asmlinkage long __arm64_##sym(const struct pt_regs *);
> diff --git a/kernel/exec_domain.c b/kernel/exec_domain.c
> index f7a0512ddc23..ec6b16e30ed1 100644
> --- a/kernel/exec_domain.c
> +++ b/kernel/exec_domain.c
> @@ -35,7 +35,18 @@ static int __init proc_execdomains_init(void)
> module_init(proc_execdomains_init);
> #endif
>
> +static int __weak arch_check_personality(unsigned int personality)
> +{
> + return 0;
> +}
> +
> SYSCALL_DEFINE1(personality, unsigned int, personality)
> {
> + int check;
> +
> + check = arch_check_personality(personality);
> + if (check)
> + return check;
> +
> return ksys_personality(personality);
> }

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