1#@!#!123s

: / usr / share / systemtap / tapset / linux /
Filename : sysc_setgroups.stp
back
# setgroups __________________________________________________
#
# long sys_setgroups(int gidsetsize, gid_t __user *grouplist)
# long sys_setgroups16(int gidsetsize, old_gid_t __user *grouplist)
# long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
#

@define _SYSCALL_SETGROUPS_NAME
%(
	name = "setgroups"
%)

@define _SYSCALL_SETGROUPS_ARGSTR
%(
	argstr = sprintf("%d, %p", size, list_uaddr)
%)

@define _SYSCALL_SETGROUPS_REGARGS
%(
	size = int_arg(1)
	list_uaddr = pointer_arg(2)
%)

probe syscall.setgroups = dw_syscall.setgroups !, nd_syscall.setgroups ? {}
probe syscall.setgroups.return = dw_syscall.setgroups.return !,
                                 nd_syscall.setgroups.return ? {}

# dw_setgroups _____________________________________________________

probe dw_syscall.setgroups = kernel.function("sys_setgroups16").call ?,
                          kernel.function("sys32_setgroups16").call ?,
%( arch == "s390" %?
                          kernel.function("compat_sys_s390_setgroups16").call ?,
%)
                          kernel.function("sys_setgroups").call ?
{
	@_SYSCALL_SETGROUPS_NAME
	size = __int32($gidsetsize)
	list_uaddr = $grouplist
	@_SYSCALL_SETGROUPS_ARGSTR
}
probe dw_syscall.setgroups.return = kernel.function("sys_setgroups16").return ?,
	kernel.function("sys32_setgroups16").return ?,
%( arch == "s390" %?
	kernel.function("compat_sys_s390_setgroups16").return ?,
%)
	kernel.function("sys_setgroups").return ?
{
	@_SYSCALL_SETGROUPS_NAME
	@SYSC_RETVALSTR($return)
}

# nd_setgroups _____________________________________________________

probe nd_syscall.setgroups = nd1_syscall.setgroups!, nd2_syscall.setgroups!, tp_syscall.setgroups
  { }

probe nd1_syscall.setgroups = kprobe.function("sys_setgroups16") ?,
                             kprobe.function("sys32_setgroups16") ?,
%( arch == "s390" %?
                             kprobe.function("compat_sys_s390_setgroups16") ?,
%)
                             kprobe.function("sys_setgroups") ?
{
	@_SYSCALL_SETGROUPS_NAME
	asmlinkage()
	@_SYSCALL_SETGROUPS_REGARGS
	@_SYSCALL_SETGROUPS_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.setgroups =
	kprobe.function(@arch_syscall_prefix "sys_setgroups") ?,
	kprobe.function(@arch_syscall_prefix "sys_setgroups16") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_SETGROUPS_NAME
	@_SYSCALL_SETGROUPS_REGARGS
	@_SYSCALL_SETGROUPS_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.setgroups = __tp_syscall.setgroups, __tp_syscall.setgroups32
{
	__set_syscall_pt_regs($regs)
	@_SYSCALL_SETGROUPS_NAME
	@_SYSCALL_SETGROUPS_REGARGS
	@_SYSCALL_SETGROUPS_ARGSTR
}
probe __tp_syscall.setgroups = kernel.trace("sys_enter")
{
	@__syscall_compat_gate(@const("__NR_setgroups"), @const("__NR_compat_setgroups"))
}
probe __tp_syscall.setgroups32 = kernel.trace("sys_enter")
{
	@__syscall_compat_gate(@const("__NR_setgroups32"), @const("__NR_compat_setgroups32"))
}

probe nd_syscall.setgroups.return = nd1_syscall.setgroups.return!, nd2_syscall.setgroups.return!, tp_syscall.setgroups.return
  { }
  
probe nd1_syscall.setgroups.return = kprobe.function("sys_setgroups16").return ?,
	kprobe.function("sys32_setgroups16").return ?,
%( arch == "s390" %?
	kprobe.function("compat_sys_s390_setgroups16").return ?,
%)
	kprobe.function("sys_setgroups").return ?
{
	@_SYSCALL_SETGROUPS_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.setgroups.return =
	kprobe.function(@arch_syscall_prefix "sys_setgroups").return ?,
	kprobe.function(@arch_syscall_prefix "sys_setgroups16").return ?
{
	@_SYSCALL_SETGROUPS_NAME
	@SYSC_RETVALSTR(returnval())
}
 
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.setgroups.return = __tp_syscall.setgroups.return, __tp_syscall.setgroups32.return
{
	__set_syscall_pt_regs($regs)
	@_SYSCALL_SETGROUPS_NAME
	@SYSC_RETVALSTR($ret)
}
probe __tp_syscall.setgroups.return = kernel.trace("sys_exit")
{
	@__syscall_compat_gate(@const("__NR_setgroups"), @const("__NR_compat_setgroups"))
}
probe __tp_syscall.setgroups32.return = kernel.trace("sys_exit")
{
	@__syscall_compat_gate(@const("__NR_setgroups32"), @const("__NR_compat_setgroups32"))
}