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beddc9fb1c
This detects seccomp support, sets the global using_seccomp variable and initilizes the exec registers. The support is only enabled if the seccomp= kernel parameter is set to either "on" or "auto". With "auto" a fallback to ptrace mode will happen if initialization failed. Signed-off-by: Benjamin Berg <benjamin@sipsolutions.net> Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Link: https://patch.msgid.link/20250602130052.545733-7-benjamin@sipsolutions.net [extend help with Kconfig text from v2, use exit syscall instead of libc, remove unneeded mctx_offset assignment, disable on 32-bit for now] Signed-off-by: Johannes Berg <johannes.berg@intel.com>
43 lines
910 B
C
43 lines
910 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2004 PathScale, Inc
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* Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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*/
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#include <errno.h>
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#include <string.h>
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#include <sys/ptrace.h>
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#include <sysdep/ptrace.h>
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#include <sysdep/ptrace_user.h>
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#include <registers.h>
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#include <stdlib.h>
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/* This is set once at boot time and not changed thereafter */
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unsigned long exec_regs[MAX_REG_NR];
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unsigned long *exec_fp_regs;
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int init_pid_registers(int pid)
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{
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int err;
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err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs);
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if (err < 0)
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return -errno;
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err = arch_init_registers(pid);
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if (err < 0)
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return err;
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exec_fp_regs = malloc(host_fp_size);
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get_fp_registers(pid, exec_fp_regs);
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return 0;
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}
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void get_safe_registers(unsigned long *regs, unsigned long *fp_regs)
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{
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memcpy(regs, exec_regs, sizeof(exec_regs));
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if (fp_regs)
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memcpy(fp_regs, exec_fp_regs, host_fp_size);
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}
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