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87b7292aa5
drgn is currently licensed as GPLv3+. Part of the long term vision for drgn is that other projects can use it as a library providing programmatic interfaces for debugger functionality. A more permissive license is better suited to this goal. We decided on LGPLv2.1+ as a good balance between software freedom and permissiveness. All contributors not employed by Meta were contacted via email and consented to the license change. The only exception was the author of commitc4fbf7e589("libdrgn: fix for compilation error"), who did not respond. That commit reverted a single line of code to one originally written by me in commit640b1c011d("libdrgn: embed DWARF index in DWARF info cache"). Signed-off-by: Omar Sandoval <osandov@osandov.com>
47 lines
1.5 KiB
Python
47 lines
1.5 KiB
Python
# Copyright (c) Meta Platforms, Inc. and affiliates.
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# SPDX-License-Identifier: LGPL-2.1-or-later
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import ctypes
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import os
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import re
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import sys
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from util import NORMALIZED_MACHINE_NAME, SYS
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# Some architectures don't implement kexec_file_load. Note that even if the
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# number is defined, it may not be implemented.
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if "kexec_file_load" not in SYS:
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sys.exit(f"kexec_file_load is not defined on {NORMALIZED_MACHINE_NAME}")
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KEXEC_FILE_ON_CRASH = 2
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KEXEC_FILE_NO_INITRAMFS = 4
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syscall = ctypes.CDLL(None, use_errno=True).syscall
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syscall.restype = ctypes.c_long
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with open("/proc/cmdline", "rb") as f:
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cmdline = f.read().rstrip(b"\n")
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cmdline = re.sub(rb"(^|\s)crashkernel=\S+", b"", cmdline)
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# `nokaslr` is required to avoid sporadically failing to reserve space for the
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# capture kernel
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cmdline += b" nokaslr"
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if os.getenv("KDUMP_NEEDS_NOSMP"):
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# `nosmp` is required to avoid QEMU sporadically failing an internal
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# assertion when using emulation.
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cmdline += b" nosmp"
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with open(f"/lib/modules/{os.uname().release}/vmlinuz", "rb") as kernel:
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if syscall(
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ctypes.c_long(SYS["kexec_file_load"]),
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ctypes.c_int(kernel.fileno()),
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ctypes.c_int(-1),
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ctypes.c_ulong(len(cmdline) + 1),
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ctypes.c_char_p(cmdline + b"\0"),
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ctypes.c_ulong(KEXEC_FILE_ON_CRASH | KEXEC_FILE_NO_INITRAMFS),
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):
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errno = ctypes.get_errno()
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raise OSError(errno, os.strerror(errno))
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with open("/proc/sysrq-trigger", "w") as f:
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f.write("c")
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