Re: [PATCH] new setprocuid syscall

[Philipp Rumpf]

> diff -urN linux-2.4.1/arch/i386/kernel/entry.S
> linux-2.4.1-setprocuid/arch/i386/kernel/entry.S
> --- linux-2.4.1/arch/i386/kernel/entry.S        Thu Nov  9 02:09:50 2000
> +++ linux-2.4.1-setprocuid/arch/i386/kernel/entry.S     Mon Feb 19
> 22:12:00 2001
> @@ -645,6 +645,7 @@
>         .long SYMBOL_NAME(sys_madvise)
>         .long SYMBOL_NAME(sys_getdents64)       /* 220 */
>         .long SYMBOL_NAME(sys_fcntl64)
> +       .long SYMBOL_NAME(sys_setprocuid)
>         .long SYMBOL_NAME(sys_ni_syscall)       /* reserved for TUX */
> 
>         /*

You stole TUX's syscall slot.

> +       p = find_task_by_pid(pid);
> +       p->fsuid = p->euid = p->suid = p->uid = uid;

p might be NULL.