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d8f8b84456
Add subarchitecture-independent implementation of asm-generic/syscall.h allowing access to user system call parameters and results: * syscall_get_nr() * syscall_rollback() * syscall_get_error() * syscall_get_return_value() * syscall_set_return_value() * syscall_get_arguments() * syscall_set_arguments() * syscall_get_arch() provided by arch/x86/um/asm/syscall.h This provides the necessary syscall helpers needed by HAVE_ARCH_SECCOMP_FILTER plus syscall_get_error(). This is inspired from Meredydd Luff's patch (https://gerrit.chromium.org/gerrit/21425). Signed-off-by: Mickaël Salaün <mic@digikod.net> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Will Drewry <wad@chromium.org> Cc: Meredydd Luff <meredydd@senatehouse.org> Cc: David Drysdale <drysdale@google.com> Signed-off-by: Richard Weinberger <richard@nod.at> Acked-by: Kees Cook <keescook@chromium.org>
138 lines
2.7 KiB
C
138 lines
2.7 KiB
C
/*
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* Access to user system call parameters and results
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*
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* See asm-generic/syscall.h for function descriptions.
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*
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* Copyright (C) 2015 Mickaël Salaün <mic@digikod.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __UM_SYSCALL_GENERIC_H
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#define __UM_SYSCALL_GENERIC_H
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#include <asm/ptrace.h>
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#include <linux/err.h>
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#include <linux/sched.h>
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#include <sysdep/ptrace.h>
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static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
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{
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return PT_REGS_SYSCALL_NR(regs);
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}
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static inline void syscall_rollback(struct task_struct *task,
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struct pt_regs *regs)
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{
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/* do nothing */
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}
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static inline long syscall_get_error(struct task_struct *task,
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struct pt_regs *regs)
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{
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const long error = regs_return_value(regs);
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return IS_ERR_VALUE(error) ? error : 0;
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}
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static inline long syscall_get_return_value(struct task_struct *task,
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struct pt_regs *regs)
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{
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return regs_return_value(regs);
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}
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static inline void syscall_set_return_value(struct task_struct *task,
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struct pt_regs *regs,
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int error, long val)
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{
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PT_REGS_SET_SYSCALL_RETURN(regs, (long) error ?: val);
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}
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static inline void syscall_get_arguments(struct task_struct *task,
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struct pt_regs *regs,
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unsigned int i, unsigned int n,
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unsigned long *args)
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{
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const struct uml_pt_regs *r = ®s->regs;
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switch (i) {
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case 0:
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if (!n--)
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break;
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*args++ = UPT_SYSCALL_ARG1(r);
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case 1:
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if (!n--)
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break;
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*args++ = UPT_SYSCALL_ARG2(r);
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case 2:
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if (!n--)
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break;
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*args++ = UPT_SYSCALL_ARG3(r);
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case 3:
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if (!n--)
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break;
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*args++ = UPT_SYSCALL_ARG4(r);
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case 4:
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if (!n--)
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break;
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*args++ = UPT_SYSCALL_ARG5(r);
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case 5:
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if (!n--)
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break;
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*args++ = UPT_SYSCALL_ARG6(r);
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case 6:
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if (!n--)
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break;
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default:
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BUG();
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break;
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}
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}
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static inline void syscall_set_arguments(struct task_struct *task,
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struct pt_regs *regs,
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unsigned int i, unsigned int n,
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const unsigned long *args)
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{
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struct uml_pt_regs *r = ®s->regs;
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switch (i) {
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case 0:
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if (!n--)
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break;
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UPT_SYSCALL_ARG1(r) = *args++;
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case 1:
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if (!n--)
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break;
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UPT_SYSCALL_ARG2(r) = *args++;
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case 2:
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if (!n--)
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break;
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UPT_SYSCALL_ARG3(r) = *args++;
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case 3:
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if (!n--)
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break;
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UPT_SYSCALL_ARG4(r) = *args++;
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case 4:
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if (!n--)
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break;
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UPT_SYSCALL_ARG5(r) = *args++;
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case 5:
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if (!n--)
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break;
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UPT_SYSCALL_ARG6(r) = *args++;
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case 6:
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if (!n--)
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break;
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default:
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BUG();
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break;
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}
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}
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/* See arch/x86/um/asm/syscall.h for syscall_get_arch() definition. */
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#endif /* __UM_SYSCALL_GENERIC_H */
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