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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 <linux/time-internal.h>
 14 #include <asm/unistd.h>
 15 
 16 void handle_syscall(struct uml_pt_regs *r)
 17 {
 18         struct pt_regs *regs = container_of(r, struct pt_regs, regs);
 19         int syscall;
 20 
 21         /*
 22          * If we have infinite CPU resources, then make every syscall also a
 23          * preemption point, since we don't have any other preemption in this
 24          * case, and kernel threads would basically never run until userspace
 25          * went to sleep, even if said userspace interacts with the kernel in
 26          * various ways.
 27          */
 28         if (time_travel_mode == TT_MODE_INFCPU ||
 29             time_travel_mode == TT_MODE_EXTERNAL)
 30                 schedule();
 31 
 32         /* Initialize the syscall number and default return value. */
 33         UPT_SYSCALL_NR(r) = PT_SYSCALL_NR(r->gp);
 34         PT_REGS_SET_SYSCALL_RETURN(regs, -ENOSYS);
 35 
 36         if (syscall_trace_enter(regs))
 37                 goto out;
 38 
 39         /* Do the seccomp check after ptrace; failures should be fast. */
 40         if (secure_computing() == -1)
 41                 goto out;
 42 
 43         syscall = UPT_SYSCALL_NR(r);
 44         if (syscall >= 0 && syscall < __NR_syscalls)
 45                 PT_REGS_SET_SYSCALL_RETURN(regs,
 46                                 EXECUTE_SYSCALL(syscall, regs));
 47 
 48 out:
 49         syscall_trace_leave(regs);
 50 }
 51 

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