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# setfsgid ___________________________________________________
# long sys_setfsgid(gid_t gid)
# long sys_setfsgid16(old_gid_t gid)
#
@define _SYSCALL_SETFSGID_NAME
%(
name = "setfsgid"
%)
@define _SYSCALL_SETFSGID_ARGSTR
%(
argstr = sprint(fsgid)
%)
@define _SYSCALL_GATE
%(
%( arch == "x86_64" %?
// There are actually 3 x86_64 setfsgid syscalls numbers (which
// get mapped to 2 syscall functions:
// - __NR_setfsgid which gets mapped to sys_setfsgid()
// - __NR_ia32_setfsgid32 which also gets mapped to
// sys_setfsgid()
// - __NR_ia32_setfsgid which gets mapped to sys_setfsgid16()
// (which is a wrapper around sys_setfsgid())
// So, we need to avoid sys_setfsgid() calls that come from
// sys_setfsgid16().
@__syscall_compat_gate(@const("__NR_setfsgid"),
@const("__NR_ia32_setfsgid32"))
%:
%( arch == "i386" %?
// On i386, there are 2 setfsgid syscall numbers:
// - __NR_setfsgid which gets mapped to sys_setfsgid16
// - __NR_setfsgid32 which gets mapped to sys_setfsgid
// Since this gets called from a probe on sys_setfsgid, we'll
// make sure this is really __NR_setfsgid32.
@__syscall_nr_gate(@const("__NR_setfsgid32"))
%)
%)
%)
@define _SYSCALL_SETFSGID_REGARGS
%(
fsgid = int_arg(1)
%)
@define _SYSCALL_SETFSGID_REGARGS_STORE
%(
if (@probewrite(fsgid))
set_int_arg(1, fsgid)
%)
probe syscall.setfsgid = dw_syscall.setfsgid !, nd_syscall.setfsgid ? {}
probe syscall.setfsgid.return = dw_syscall.setfsgid.return !,
nd_syscall.setfsgid.return ? {}
# dw_setfsgid _____________________________________________________
probe dw_syscall.setfsgid = kernel.function("sys_setfsgid16").call ?,
__syscall.setfsgid ?
{
@_SYSCALL_SETFSGID_NAME
fsgid = __int32($gid)
@_SYSCALL_SETFSGID_ARGSTR
}
probe __syscall.setfsgid = kernel.function("sys_setfsgid").call ?
{
@_SYSCALL_GATE
}
probe dw_syscall.setfsgid.return = kernel.function("sys_setfsgid16").return ?,
__syscall.setfsgid.return ?
{
@_SYSCALL_SETFSGID_NAME
@SYSC_RETVALSTR($return)
}
probe __syscall.setfsgid.return = kernel.function("sys_setfsgid").return ?
{
@_SYSCALL_GATE
}
# nd_setfsgid _____________________________________________________
probe nd_syscall.setfsgid = nd1_syscall.setfsgid!, nd2_syscall.setfsgid!, tp_syscall.setfsgid
{ }
probe nd1_syscall.setfsgid = kprobe.function("sys_setfsgid16") ?,
__nd1_syscall.setfsgid ?
{
@_SYSCALL_SETFSGID_NAME
asmlinkage()
@_SYSCALL_SETFSGID_REGARGS
@_SYSCALL_SETFSGID_ARGSTR
}
probe __nd1_syscall.setfsgid = kprobe.function("sys_setfsgid") ?
{
@_SYSCALL_GATE
}
/* kernel 4.17+ */
probe nd2_syscall.setfsgid = kprobe.function(@arch_syscall_prefix "sys_setfsgid") ?,
kprobe.function(@arch_syscall_prefix "sys_setfsgid16") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_SETFSGID_NAME
@_SYSCALL_SETFSGID_REGARGS
@_SYSCALL_SETFSGID_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_SETFSGID_REGARGS_STORE %)
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.setfsgid = __tp_syscall.setfsgid, __tp_syscall.setfsgid16
{
__set_syscall_pt_regs($regs)
@_SYSCALL_SETFSGID_NAME
@_SYSCALL_SETFSGID_REGARGS
@_SYSCALL_SETFSGID_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_SETFSGID_REGARGS_STORE %)
}
probe __tp_syscall.setfsgid = kernel.trace("sys_enter")
{
@__syscall_compat_gate(@const("__NR_setfsgid"), @const("__NR_compat_setfsgid32"))
}
probe __tp_syscall.setfsgid16 = kernel.trace("sys_enter")
{
@__compat_syscall_gate(@const("__NR_compat_setfsgid"))
}
probe nd_syscall.setfsgid.return = nd1_syscall.setfsgid.return!, nd2_syscall.setfsgid.return!, tp_syscall.setfsgid.return
{ }
probe nd1_syscall.setfsgid.return = kprobe.function("sys_setfsgid16").return ?,
__nd1_syscall.setfsgid.return ?
{
@_SYSCALL_SETFSGID_NAME
@SYSC_RETVALSTR(returnval())
}
probe __nd1_syscall.setfsgid.return = kprobe.function("sys_setfsgid").return ?
{
@_SYSCALL_GATE
}
/* kernel 4.17+ */
probe nd2_syscall.setfsgid.return =
kprobe.function(@arch_syscall_prefix "sys_setfsgid").return ?,
kprobe.function(@arch_syscall_prefix "sys_setfsgid16").return ?
{
@_SYSCALL_SETFSGID_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.setfsgid.return = __tp_syscall.setfsgid.return, __tp_syscall.setfsgid16.return
{
__set_syscall_pt_regs($regs)
@_SYSCALL_SETFSGID_NAME
@SYSC_RETVALSTR($ret)
}
probe __tp_syscall.setfsgid.return = kernel.trace("sys_exit")
{
@__syscall_compat_gate(@const("__NR_setfsgid"), @const("__NR_compat_setfsgid32"))
}
probe __tp_syscall.setfsgid16.return = kernel.trace("sys_exit")
{
@__compat_syscall_gate(@const("__NR_compat_setfsgid"))
}
|
