def test_get_child():
"""Test getting child of a sysctl definition."""
source = KernelSourceTree("kernel/linux-3.10.0-957.el7",
KernelLlvmSourceBuilder)
kernel_module = source.get_module_for_symbol("sysctl_base_table")
sysctl_module = LlvmSysctlModule(kernel_module, "sysctl_base_table")
assert sysctl_module.get_child("vm").name == "vm_table"
def mod():
"""
Build LlvmSysctlModule for net.core.* sysctl options shared among tests.
"""
source = KernelSource("kernel/linux-3.10.0-862.el7", True)
kernel_module = source.get_module_from_source("net/core/sysctl_net_core.c")
yield LlvmSysctlModule(kernel_module, "net_core_table")
source.finalize()
def mod():
"""
Build LlvmSysctlModule for net.core.* sysctl options shared among tests.
"""
source = KernelSourceTree("kernel/linux-3.10.0-957.el7",
KernelLlvmSourceBuilder)
kernel_module = source.get_module_for_symbol("net_core_table")
yield LlvmSysctlModule(kernel_module, "net_core_table")
source.finalize()
def get_sysctl_module(self, sysctl):
"""
Get the LLVM module containing the definition of a sysctl option.
:param sysctl: sysctl option to search for
:return: Instance of LlvmSysctlModule.
"""
# The sysctl is composed of entries separated by dots. Entries form
# a hierarchy - each entry is a child of its predecessor (i.e. all
# entries except the last one point to sysctl tables). We follow
# the hierarchy and build the source containing the parent table of
# the last entry.
entries = sysctl.split(".")
if entries[0] in ["kernel", "vm", "fs", "debug", "dev"]:
src = "kernel/sysctl.c"
table = "sysctl_base_table"
elif entries[0] == "net":
if entries[1] == "ipv4":
if entries[2] == "conf":
src = "net/ipv4/devinet.c"
table = "devinet_sysctl.1"
entries = entries[4:]
else:
src = "net/ipv4/sysctl_net_ipv4.c"
table = "ipv4_table"
entries = entries[2:]
elif entries[1] == "core":
src = "net/core/sysctl_net_core.c"
table = "net_core_table"
entries = entries[2:]
else:
raise SourceNotFoundException(sysctl)
else:
raise SourceNotFoundException(sysctl)
for (i, entry) in enumerate(entries):
# Build the file normally and then create a corresponding
# LlvmSysctlModule with the obtained sysctl table.
kernel_mod = self.get_module_from_source(src)
sysctl_mod = LlvmSysctlModule(kernel_mod, table)
if i == len(entries) - 1:
return sysctl_mod
table = sysctl_mod.get_child(entry).name
src = self.find_srcs_with_symbol_def(table)[0]
raise SourceNotFoundException(sysctl)
def test_get_child():
"""Test getting child of a sysctl definition."""
source = KernelSource("kernel/linux-3.10.0-862.el7", True)
kernel_module = source.get_module_from_source("kernel/sysctl.c")
sysctl_module = LlvmSysctlModule(kernel_module, "sysctl_base_table")
assert sysctl_module.get_child("vm").name == "vm_table"