scripts/gdb: add mount point list command (c1a15399) · Commits · 戴 / test

scripts/gdb/linux/constants.py.in

+20 −0

Original line number	Diff line number	Diff line
		@@ -12,7 +12,11 @@
		*
		*/

		#include <linux/fs.h>
		#include <linux/mount.h>

		/* We need to stringify expanded macros so that they can be parsed */

		#define STRING(x) #x
		#define XSTRING(x) STRING(x)

		@@ -30,3 +34,19 @@
		<!-- end-c-headers -->

		import gdb

		/* linux/fs.h */
		LX_VALUE(MS_RDONLY)
		LX_VALUE(MS_SYNCHRONOUS)
		LX_VALUE(MS_MANDLOCK)
		LX_VALUE(MS_DIRSYNC)
		LX_VALUE(MS_NOATIME)
		LX_VALUE(MS_NODIRATIME)

		/* linux/mount.h */
		LX_VALUE(MNT_NOSUID)
		LX_VALUE(MNT_NODEV)
		LX_VALUE(MNT_NOEXEC)
		LX_VALUE(MNT_NOATIME)
		LX_VALUE(MNT_NODIRATIME)
		LX_VALUE(MNT_RELATIME)

scripts/gdb/linux/proc.py

+99 −0

Original line number	Diff line number	Diff line
		@@ -12,6 +12,10 @@
		#

		import gdb
		from linux import constants
		from linux import utils
		from linux import tasks
		from linux import lists


		class LxCmdLine(gdb.Command):
		@@ -96,3 +100,98 @@ Equivalent to cat /proc/ioports on a running target"""
		return show_lx_resources("ioport_resource")

		LxIOPorts()


		# Mount namespace viewer
		# /proc/mounts

		def info_opts(lst, opt):
		opts = ""
		for key, string in lst.items():
		if opt & key:
		opts += string
		return opts


		FS_INFO = {constants.LX_MS_SYNCHRONOUS: ",sync",
		constants.LX_MS_MANDLOCK: ",mand",
		constants.LX_MS_DIRSYNC: ",dirsync",
		constants.LX_MS_NOATIME: ",noatime",
		constants.LX_MS_NODIRATIME: ",nodiratime"}

		MNT_INFO = {constants.LX_MNT_NOSUID: ",nosuid",
		constants.LX_MNT_NODEV: ",nodev",
		constants.LX_MNT_NOEXEC: ",noexec",
		constants.LX_MNT_NOATIME: ",noatime",
		constants.LX_MNT_NODIRATIME: ",nodiratime",
		constants.LX_MNT_RELATIME: ",relatime"}

		mount_type = utils.CachedType("struct mount")
		mount_ptr_type = mount_type.get_type().pointer()


		class LxMounts(gdb.Command):
		"""Report the VFS mounts of the current process namespace.

		Equivalent to cat /proc/mounts on a running target
		An integer value can be supplied to display the mount
		values of that process namespace"""

		def __init__(self):
		super(LxMounts, self).__init__("lx-mounts", gdb.COMMAND_DATA)

		# Equivalent to proc_namespace.c:show_vfsmnt
		# However, that has the ability to call into s_op functions
		# whereas we cannot and must make do with the information we can obtain.
		def invoke(self, arg, from_tty):
		argv = gdb.string_to_argv(arg)
		if len(argv) >= 1:
		try:
		pid = int(argv[0])
		except:
		raise gdb.GdbError("Provide a PID as integer value")
		else:
		pid = 1

		task = tasks.get_task_by_pid(pid)
		if not task:
		raise gdb.GdbError("Couldn't find a process with PID {}"
		.format(pid))

		namespace = task['nsproxy']['mnt_ns']
		if not namespace:
		raise gdb.GdbError("No namespace for current process")

		for vfs in lists.list_for_each_entry(namespace['list'],
		mount_ptr_type, "mnt_list"):
		devname = vfs['mnt_devname'].string()
		devname = devname if devname else "none"

		pathname = ""
		parent = vfs
		while True:
		mntpoint = parent['mnt_mountpoint']
		pathname = utils.dentry_name(mntpoint) + pathname
		if (parent == parent['mnt_parent']):
		break
		parent = parent['mnt_parent']

		if (pathname == ""):
		pathname = "/"

		superblock = vfs['mnt']['mnt_sb']
		fstype = superblock['s_type']['name'].string()
		s_flags = int(superblock['s_flags'])
		m_flags = int(vfs['mnt']['mnt_flags'])
		rd = "ro" if (s_flags & constants.LX_MS_RDONLY) else "rw"

		gdb.write(
		"{} {} {} {}{}{} 0 0\n"
		.format(devname,
		pathname,
		fstype,
		rd,
		info_opts(FS_INFO, s_flags),
		info_opts(MNT_INFO, m_flags)))

		LxMounts()

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