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|
# sigaltstack ________________________________________________
#
# In kernel 3.8, CONFIG_GENERIC_SIGALTSTACK was added by
# kernel commit 6bf9adfc90370b695cb111116e15fdc0e1906270.
#
# Then, in kernel 3.9, all architectures were switched to using the
# generic sigaltstack by kernel commit
# d64008a8f30e0b381b292788ec6f3ee509b3bb40, which also removed the
# CONFIG_GENERIC_SIGALTSTACK config variable.
#
# Thus the following preprocessor test.
%( CONFIG_GENERIC_SIGALTSTACK == "y" || kernel_v >= "3.9" %?
# SYSCALL_DEFINE2(sigaltstack,const stack_t __user *,uss, stack_t __user *,uoss)
# COMPAT_SYSCALL_DEFINE2(sigaltstack,
# const compat_stack_t __user *, uss_ptr,
# compat_stack_t __user *, uoss_ptr)
#
@define _SYSCALL_SIGALTSTACK_NAME
%(
name = "sigaltstack"
%)
@define _SYSCALL_SIGALTSTACK_ARGSTR
%(
argstr = sprintf("%s, %p", uss_str, uoss_uaddr)
%)
@define _SYSCALL_SIGALTSTACK_REGARGS
%(
uss_uaddr = pointer_arg(1)
uss_str = (@__compat_task ? _stp_compat_sigaltstack_u(uss_uaddr)
: _stp_sigaltstack_u(uss_uaddr))
uoss_uaddr = pointer_arg(2)
%)
@define _SYSCALL_SIGALTSTACK_REGARGS_STORE
%(
if (@probewrite(uss_uaddr))
set_pointer_arg(1, uss_uaddr)
if (@probewrite(uoss_uaddr))
set_pointer_arg(2, uoss_uaddr)
%)
probe syscall.sigaltstack = dw_syscall.sigaltstack !, nd_syscall.sigaltstack ? {}
probe syscall.sigaltstack.return = dw_syscall.sigaltstack.return !,
nd_syscall.sigaltstack.return ? {}
# dw_sigaltstack _____________________________________________________
probe dw_syscall.sigaltstack = kernel.function("sys_sigaltstack").call,
kernel.function("compat_sys_sigaltstack").call ?
{
@_SYSCALL_SIGALTSTACK_NAME
uss_uaddr = @__pointer(@choose_defined($uss, $uss_ptr))
uss_str = (@__compat_task ? _stp_compat_sigaltstack_u(uss_uaddr)
: _stp_sigaltstack_u(uss_uaddr))
uoss_uaddr = @__pointer(@choose_defined($uoss, $uoss_ptr))
@_SYSCALL_SIGALTSTACK_ARGSTR
}
probe dw_syscall.sigaltstack.return = kernel.function("sys_sigaltstack").return,
kernel.function("compat_sys_sigaltstack").return ?
{
@_SYSCALL_SIGALTSTACK_NAME
@SYSC_RETVALSTR($return)
}
# nd_sigaltstack _____________________________________________________
probe nd_syscall.sigaltstack = nd1_syscall.sigaltstack!, nd2_syscall.sigaltstack!, tp_syscall.sigaltstack
{ }
probe nd1_syscall.sigaltstack = kprobe.function("sys_sigaltstack"),
kprobe.function("compat_sys_sigaltstack") ?
{
@_SYSCALL_SIGALTSTACK_NAME
asmlinkage()
@_SYSCALL_SIGALTSTACK_REGARGS
@_SYSCALL_SIGALTSTACK_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.sigaltstack = kprobe.function(@arch_syscall_prefix "sys_sigaltstack") ?,
kprobe.function(@arch_syscall_prefix "compat_sys_sigaltstack") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_SIGALTSTACK_NAME
@_SYSCALL_SIGALTSTACK_REGARGS
@_SYSCALL_SIGALTSTACK_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_SIGALTSTACK_REGARGS_STORE %)
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.sigaltstack = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_sigaltstack"), @const("__NR_compat_sigaltstack"))
@_SYSCALL_SIGALTSTACK_NAME
@_SYSCALL_SIGALTSTACK_REGARGS
@_SYSCALL_SIGALTSTACK_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_SIGALTSTACK_REGARGS_STORE %)
}
probe nd_syscall.sigaltstack.return = nd1_syscall.sigaltstack.return!, nd2_syscall.sigaltstack.return!, tp_syscall.sigaltstack.return
{ }
probe nd1_syscall.sigaltstack.return = kprobe.function("sys_sigaltstack").return,
kprobe.function("compat_sys_sigaltstack").return ?
{
@_SYSCALL_SIGALTSTACK_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.sigaltstack.return = kprobe.function(@arch_syscall_prefix "sys_sigaltstack").return ?,
kprobe.function(@arch_syscall_prefix "compat_sys_sigaltstack").return ?
{
@_SYSCALL_SIGALTSTACK_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.sigaltstack.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_sigaltstack"), @const("__NR_compat_sigaltstack"))
@_SYSCALL_SIGALTSTACK_NAME
@SYSC_RETVALSTR($ret)
}
%)
|
