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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/um/kernel/skas/syscall.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | arch/um/kernel/skas/syscall.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/arch/um/kernel/skas/syscall.c b/arch/um/kernel/skas/syscall.c new file mode 100644 index 000000000..9ee19e566 --- /dev/null +++ b/arch/um/kernel/skas/syscall.c @@ -0,0 +1,50 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) + */ + +#include <linux/kernel.h> +#include <linux/ptrace.h> +#include <linux/seccomp.h> +#include <kern_util.h> +#include <sysdep/ptrace.h> +#include <sysdep/ptrace_user.h> +#include <sysdep/syscalls.h> +#include <linux/time-internal.h> +#include <asm/unistd.h> + +void handle_syscall(struct uml_pt_regs *r) +{ + struct pt_regs *regs = container_of(r, struct pt_regs, regs); + int syscall; + + /* + * If we have infinite CPU resources, then make every syscall also a + * preemption point, since we don't have any other preemption in this + * case, and kernel threads would basically never run until userspace + * went to sleep, even if said userspace interacts with the kernel in + * various ways. + */ + if (time_travel_mode == TT_MODE_INFCPU || + time_travel_mode == TT_MODE_EXTERNAL) + schedule(); + + /* Initialize the syscall number and default return value. */ + UPT_SYSCALL_NR(r) = PT_SYSCALL_NR(r->gp); + PT_REGS_SET_SYSCALL_RETURN(regs, -ENOSYS); + + if (syscall_trace_enter(regs)) + goto out; + + /* Do the seccomp check after ptrace; failures should be fast. */ + if (secure_computing() == -1) + goto out; + + syscall = UPT_SYSCALL_NR(r); + if (syscall >= 0 && syscall < __NR_syscalls) + PT_REGS_SET_SYSCALL_RETURN(regs, + EXECUTE_SYSCALL(syscall, regs)); + +out: + syscall_trace_leave(regs); +} |