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# flock ______________________________________________________
# long sys_flock(unsigned int fd, unsigned int cmd)
@define _SYSCALL_FLOCK_NAME
%(
name = "flock"
%)
@define _SYSCALL_FLOCK_ARGSTR
%(
argstr = sprintf("%d, %s", fd, _flock_cmd_str(operation))
%)
@define _SYSCALL_FLOCK_REGARGS
%(
fd = int_arg(1)
operation = int_arg(2)
%)
@define _SYSCALL_FLOCK_REGARGS_STORE
%(
if (@probewrite(fd))
set_int_arg(1, fd)
if (@probewrite(operation))
set_int_arg(2, operation)
%)
probe syscall.flock = dw_syscall.flock !, nd_syscall.flock ? {}
probe syscall.flock.return = dw_syscall.flock.return !, nd_syscall.flock.return ? {}
# dw_flock _____________________________________________________
probe dw_syscall.flock = kernel.function("sys_flock").call
{
@_SYSCALL_FLOCK_NAME
fd = __int32($fd)
operation = $cmd
@_SYSCALL_FLOCK_ARGSTR
}
probe dw_syscall.flock.return = kernel.function("sys_flock").return
{
@_SYSCALL_FLOCK_NAME
@SYSC_RETVALSTR($return)
}
# nd_flock _____________________________________________________
probe nd_syscall.flock = nd1_syscall.flock!, nd2_syscall.flock!, tp_syscall.flock
{ }
probe nd1_syscall.flock = kprobe.function("sys_flock") ?
{
@_SYSCALL_FLOCK_NAME
asmlinkage()
@_SYSCALL_FLOCK_REGARGS
@_SYSCALL_FLOCK_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.flock = kprobe.function(@arch_syscall_prefix "sys_flock") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_FLOCK_NAME
@_SYSCALL_FLOCK_REGARGS
@_SYSCALL_FLOCK_ARGSTR
},
{
@_SYSCALL_FLOCK_REGARGS_STORE
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.flock = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_flock"), @const("__NR_compat_flock"))
@_SYSCALL_FLOCK_NAME
@_SYSCALL_FLOCK_REGARGS
@_SYSCALL_FLOCK_ARGSTR
},
{
@_SYSCALL_FLOCK_REGARGS_STORE
}
probe nd_syscall.flock.return = nd1_syscall.flock.return!, nd2_syscall.flock.return!, tp_syscall.flock.return
{ }
probe nd1_syscall.flock.return = kprobe.function("sys_flock").return ?
{
@_SYSCALL_FLOCK_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.flock.return = kprobe.function(@arch_syscall_prefix "sys_flock").return ?
{
@_SYSCALL_FLOCK_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.flock.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_flock"), @const("__NR_compat_flock"))
@_SYSCALL_FLOCK_NAME
@SYSC_RETVALSTR($ret)
}
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