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# setfsuid ___________________________________________________
# long sys_setfsuid(uid_t uid)
# long sys_setfsuid16(old_uid_t uid)
#
@define _SYSCALL_SETFSUID_NAME
%(
name = "setfsuid"
%)
@define _SYSCALL_SETFSUID_ARGSTR
%(
argstr = sprint(fsuid)
%)
@define _SYSCALL_GATE
%(
%( arch == "x86_64" %?
// There are actually 3 x86_64 setfsuid syscalls numbers (which
// get mapped to 2 syscall functions:
// - __NR_setfsuid which gets mapped to sys_setfsuid()
// - __NR_ia32_setfsuid32 which also gets mapped to
// sys_setfsuid()
// - __NR_ia32_setfsuid which gets mapped to sys_setfsuid16()
// (which is a wrapper around sys_setfsuid())
// So, we need to avoid sys_setfsuid() calls that come from
// sys_setfsuid16().
@__syscall_compat_gate(@const("__NR_setfsuid"),
@const("__NR_ia32_setfsuid32"))
%:
%( arch == "i386" %?
// On i386, there are 2 setfsuid syscall numbers:
// - __NR_setfsuid which gets mapped to sys_setfsuid16
// - __NR_setfsuid32 which gets mapped to sys_setfsuid
// Since this gets called from a probe on sys_setfsuid, we'll
// make sure this is really __NR_setfsuid32.
@__syscall_nr_gate(@const("__NR_setfsuid32"))
%)
%)
%)
@define _SYSCALL_SETFSUID_REGARGS
%(
fsuid = int_arg(1)
%)
probe syscall.setfsuid = dw_syscall.setfsuid !, nd_syscall.setfsuid ? {}
probe syscall.setfsuid.return = dw_syscall.setfsuid.return !,
nd_syscall.setfsuid.return ? {}
# dw_setfsuid _____________________________________________________
probe dw_syscall.setfsuid = kernel.function("sys_setfsuid16").call ?,
__syscall.setfsuid ?
{
@_SYSCALL_SETFSUID_NAME
fsuid = __int32($uid)
@_SYSCALL_SETFSUID_ARGSTR
}
probe __syscall.setfsuid = kernel.function("sys_setfsuid").call ?
{
@_SYSCALL_GATE
}
probe dw_syscall.setfsuid.return = kernel.function("sys_setfsuid16").return ?,
__syscall.setfsuid.return ?
{
@_SYSCALL_SETFSUID_NAME
@SYSC_RETVALSTR($return)
}
probe __syscall.setfsuid.return = kernel.function("sys_setfsuid").return ?
{
@_SYSCALL_GATE
}
# nd_setfsuid _____________________________________________________
probe nd_syscall.setfsuid = nd1_syscall.setfsuid!, nd2_syscall.setfsuid!, tp_syscall.setfsuid
{ }
probe nd1_syscall.setfsuid = kprobe.function("sys_setfsuid16") ?,
__nd1_syscall.setfsuid ?
{
@_SYSCALL_SETFSUID_NAME
asmlinkage()
@_SYSCALL_SETFSUID_REGARGS
@_SYSCALL_SETFSUID_ARGSTR
}
probe __nd1_syscall.setfsuid = kprobe.function("sys_setfsuid") ?
{
@_SYSCALL_GATE
}
/* kernel 4.17+ */
probe nd2_syscall.setfsuid = kprobe.function(@arch_syscall_prefix "sys_setfsuid") ?,
kprobe.function(@arch_syscall_prefix "sys_setfsuid16") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_SETFSUID_NAME
@_SYSCALL_SETFSUID_REGARGS
@_SYSCALL_SETFSUID_ARGSTR
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.setfsuid = __tp_syscall.setfsuid, __tp_syscall.setfsuid16
{
__set_syscall_pt_regs($regs)
@_SYSCALL_SETFSUID_NAME
@_SYSCALL_SETFSUID_REGARGS
@_SYSCALL_SETFSUID_ARGSTR
}
probe __tp_syscall.setfsuid = kernel.trace("sys_enter")
{
@__syscall_compat_gate(@const("__NR_setfsuid"), @const("__NR_compat_setfsuid32"))
}
probe __tp_syscall.setfsuid16 = kernel.trace("sys_enter")
{
@__compat_syscall_gate(@const("__NR_compat_setfsuid"))
}
probe nd_syscall.setfsuid.return = nd1_syscall.setfsuid.return!, nd2_syscall.setfsuid.return!, tp_syscall.setfsuid.return
{ }
probe nd1_syscall.setfsuid.return = kprobe.function("sys_setfsuid16").return ?,
__nd1_syscall.setfsuid.return ?
{
@_SYSCALL_SETFSUID_NAME
@SYSC_RETVALSTR(returnval())
}
probe __nd1_syscall.setfsuid.return = kprobe.function("sys_setfsuid").return ?
{
@_SYSCALL_GATE
}
/* kernel 4.17+ */
probe nd2_syscall.setfsuid.return =
kprobe.function(@arch_syscall_prefix "sys_setfsuid").return ?,
kprobe.function(@arch_syscall_prefix "sys_setfsuid16").return ?
{
@_SYSCALL_SETFSUID_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.setfsuid.return = __tp_syscall.setfsuid.return, __tp_syscall.setfsuid16.return
{
__set_syscall_pt_regs($regs)
@_SYSCALL_SETFSUID_NAME
@SYSC_RETVALSTR($ret)
}
probe __tp_syscall.setfsuid.return = kernel.trace("sys_exit")
{
@__syscall_compat_gate(@const("__NR_setfsuid"), @const("__NR_compat_setfsuid32"))
}
probe __tp_syscall.setfsuid16.return = kernel.trace("sys_exit")
{
@__compat_syscall_gate(@const("__NR_compat_setfsuid"))
}
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