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# seccomp ____________________________________________________
# long sys_seccomp(unsigned int op, unsigned int flags, const char __user* uargs)
@define _SYSCALL_SECCOMP_NAME
%(
name = "seccomp"
%)
@define _SYSCALL_SECCOMP_ARGSTR
%(
argstr = sprintf("%s, %s, %p", op_str, flags_str, uargs_uaddr)
%)
@define _SYSCALL_SECCOMP_REGARGS
%(
op = uint_arg(1)
op_str = _seccomp_op_str(op)
flags = uint_arg(2)
flags_str = _seccomp_flags_str(flags)
%( systemtap_v <= "2.9" %?
uargs = user_string_quoted(pointer_arg(3))
uargs_unquoted = user_string_nofault(pointer_arg(3))
%)
uargs_uaddr = pointer_arg(3)
%)
@define _SYSCALL_SECCOMP_REGARGS_STORE
%(
if (@probewrite(op))
set_uint_arg(1, op)
if (@probewrite(flags))
set_uint_arg(2, flags)
if (@probewrite(uargs_uaddr))
set_pointer_arg(3, uargs_uaddr)
%( systemtap_v <= "2.9" %?
if (@probewrite(uargs_unquoted))
set_user_string_arg(pointer_arg(3), uargs_unquoted)
%)
%)
probe syscall.seccomp = dw_syscall.seccomp !, nd_syscall.seccomp ? {}
probe syscall.seccomp.return = dw_syscall.seccomp.return !,
nd_syscall.seccomp.return ? {}
# dw_seccomp _____________________________________________________
probe dw_syscall.seccomp = kernel.function("sys_seccomp").call ?
{
@_SYSCALL_SECCOMP_NAME
op = $op
op_str = _seccomp_op_str(op)
flags = $flags
flags_str = _seccomp_flags_str(flags)
%( systemtap_v <= "2.9" %?
uargs = user_string_quoted($uargs)
%)
uargs_uaddr = $uargs
@_SYSCALL_SECCOMP_ARGSTR
}
probe dw_syscall.seccomp.return = kernel.function("sys_seccomp").return ?
{
@_SYSCALL_SECCOMP_NAME
@SYSC_RETVALSTR($return)
}
# nd_seccomp _____________________________________________________
probe nd_syscall.seccomp = nd1_syscall.seccomp!, nd2_syscall.seccomp!, tp_syscall.seccomp
{ }
probe nd1_syscall.seccomp = kprobe.function("sys_seccomp") ?
{
@_SYSCALL_SECCOMP_NAME
asmlinkage()
@_SYSCALL_SECCOMP_REGARGS
@_SYSCALL_SECCOMP_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.seccomp = kprobe.function(@arch_syscall_prefix "sys_seccomp") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_SECCOMP_NAME
@_SYSCALL_SECCOMP_REGARGS
@_SYSCALL_SECCOMP_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_SECCOMP_REGARGS_STORE %)
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.seccomp = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_seccomp"), @const("__NR_compat_seccomp"))
@_SYSCALL_SECCOMP_NAME
@_SYSCALL_SECCOMP_REGARGS
@_SYSCALL_SECCOMP_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_SECCOMP_REGARGS_STORE %)
}
probe nd_syscall.seccomp.return = nd1_syscall.seccomp.return!, nd2_syscall.seccomp.return!, tp_syscall.seccomp.return
{ }
probe nd1_syscall.seccomp.return = kprobe.function("sys_seccomp").return ?
{
@_SYSCALL_SECCOMP_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.seccomp.return = kprobe.function(@arch_syscall_prefix "sys_seccomp").return ?
{
@_SYSCALL_SECCOMP_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.seccomp.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_seccomp"), @const("__NR_compat_seccomp"))
@_SYSCALL_SECCOMP_NAME
@SYSC_RETVALSTR($ret)
}
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