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# getrandom __________________________________________________
# long sys_getrandom(char __user *buf, size_t count, unsigned int flags)
@define _SYSCALL_GETRANDOM_NAME
%(
name = "getrandom"
%)
@define _SYSCALL_GETRANDOM_ARGSTR
%(
argstr = sprintf("%s, %u, %s", buf, count, flags_str)
%)
@define _SYSCALL_GETRANDOM_REGARGS
%(
buf = user_string_quoted(pointer_arg(1))
count = ulong_arg(2)
flags = uint_arg(3)
flags_str = _getrandom_flags_str(uint_arg(3))
%)
probe syscall.getrandom = dw_syscall.getrandom !, nd_syscall.getrandom ? {}
probe syscall.getrandom.return = dw_syscall.getrandom.return !,
nd_syscall.getrandom.return ? {}
# dw_getrandom _____________________________________________________
probe dw_syscall.getrandom = kernel.function("sys_getrandom").call ?
{
@_SYSCALL_GETRANDOM_NAME
buf = user_string_quoted($buf)
count = __ulong($count)
flags = __uint32($flags)
flags_str = _getrandom_flags_str(__uint32($flags))
@_SYSCALL_GETRANDOM_ARGSTR
}
probe dw_syscall.getrandom.return = kernel.function("sys_getrandom").return ?
{
@_SYSCALL_GETRANDOM_NAME
@SYSC_RETVALSTR($return)
}
# nd_getrandom _____________________________________________________
probe nd_syscall.getrandom = nd1_syscall.getrandom!, nd2_syscall.getrandom!, tp_syscall.getrandom
{ }
probe nd1_syscall.getrandom = kprobe.function("sys_getrandom") ?
{
@_SYSCALL_GETRANDOM_NAME
asmlinkage()
@_SYSCALL_GETRANDOM_REGARGS
@_SYSCALL_GETRANDOM_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.getrandom = kprobe.function(@arch_syscall_prefix "sys_getrandom") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_GETRANDOM_NAME
@_SYSCALL_GETRANDOM_REGARGS
@_SYSCALL_GETRANDOM_ARGSTR
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.getrandom = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_getrandom"), @const("__NR_compat_getrandom"))
@_SYSCALL_GETRANDOM_NAME
@_SYSCALL_GETRANDOM_REGARGS
@_SYSCALL_GETRANDOM_ARGSTR
}
probe nd_syscall.getrandom.return = nd1_syscall.getrandom.return!, nd2_syscall.getrandom.return!, tp_syscall.getrandom.return
{ }
probe nd_syscall.getrandom.return = kprobe.function("sys_getrandom").return ?
{
@_SYSCALL_GETRANDOM_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.getrandom.return = kprobe.function(@arch_syscall_prefix "sys_getrandom").return ?
{
@_SYSCALL_GETRANDOM_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.getrandom.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_getrandom"), @const("__NR_compat_getrandom"))
@_SYSCALL_GETRANDOM_NAME
@SYSC_RETVALSTR($ret)
}
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