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Linux/arch/um/kernel/skas/syscall.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  4  */
  5 
  6 #include <linux/kernel.h>
  7 #include <linux/ptrace.h>
  8 #include <linux/seccomp.h>
  9 #include <kern_util.h>
 10 #include <sysdep/ptrace.h>
 11 #include <sysdep/ptrace_user.h>
 12 #include <sysdep/syscalls.h>
 13 #include <shared/timer-internal.h>
 14 
 15 void handle_syscall(struct uml_pt_regs *r)
 16 {
 17         struct pt_regs *regs = container_of(r, struct pt_regs, regs);
 18         int syscall;
 19 
 20         /*
 21          * If we have infinite CPU resources, then make every syscall also a
 22          * preemption point, since we don't have any other preemption in this
 23          * case, and kernel threads would basically never run until userspace
 24          * went to sleep, even if said userspace interacts with the kernel in
 25          * various ways.
 26          */
 27         if (time_travel_mode == TT_MODE_INFCPU)
 28                 schedule();
 29 
 30         /* Initialize the syscall number and default return value. */
 31         UPT_SYSCALL_NR(r) = PT_SYSCALL_NR(r->gp);
 32         PT_REGS_SET_SYSCALL_RETURN(regs, -ENOSYS);
 33 
 34         if (syscall_trace_enter(regs))
 35                 goto out;
 36 
 37         /* Do the seccomp check after ptrace; failures should be fast. */
 38         if (secure_computing() == -1)
 39                 goto out;
 40 
 41         syscall = UPT_SYSCALL_NR(r);
 42         if (syscall >= 0 && syscall <= __NR_syscall_max)
 43                 PT_REGS_SET_SYSCALL_RETURN(regs,
 44                                 EXECUTE_SYSCALL(syscall, regs));
 45 
 46 out:
 47         syscall_trace_leave(regs);
 48 }
 49 

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