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📄 aux_syscalls.stp(3.58 KB)
📄 sysc_arch_prctl.stp(3.21 KB)
📄 sysc_compat_execve.stp(1.59 KB)
📄 sysc_compat_fadvise64.stp(6.92 KB)
📄 sysc_compat_fallocate.stp(3.54 KB)
📄 sysc_compat_ftruncate64.stp(3.34 KB)
📄 sysc_compat_lookup_dcookie.stp(3.72 KB)
📄 sysc_compat_readahead.stp(3.18 KB)
📄 sysc_compat_truncate64.stp(3.45 KB)
📄 sysc_execve.stp(1.62 KB)
📄 sysc_get_thread_area.stp(3.18 KB)
📄 sysc_iopl.stp(2.27 KB)
📄 sysc_mmap.stp(4.04 KB)
📄 sysc_mmap2.stp(2.62 KB)
📄 sysc_pipe32.stp(1.54 KB)
📄 sysc_set_thread_area.stp(3.13 KB)
📄 sysc_sigaltstack.stp(2.24 KB)
📄 sysc_sysctl32.stp(1.12 KB)
📄 sysc_vm86_warning.stp(1.17 KB)
📄 syscall_num.stp(53.77 KB)

Editing: sysc_compat_truncate64.stp

# truncate _______________________________________________________
#
# asmlinkage long sys32_truncate64(const char __user *filename,
#				   unsigned long offset_low,
#				   unsigned long offset_high)
# COMPAT_SYSCALL_DEFINE3(x86_truncate64, const char __user *, filename,
#			 unsigned long, offset_low, unsigned long, offset_high)
#

@define _SYSCALL_COMPAT_TRUNCATE64_NAME
%(
	name = "truncate"
%)

@define _SYSCALL_COMPAT_TRUNCATE64_ARGSTR
%(
	argstr = sprintf("%s, %d", path, length)
%)

@define _SYSCALL_COMPAT_TRUNCATE64_REGARGS
%(
	path_uaddr = pointer_arg(1)
	path = user_string_quoted(path_uaddr)
        length = ((uint_arg(3) << 32) | uint_arg(2))
%)

probe syscall.compat_truncate64 = dw_syscall.compat_truncate64 !,
                                  nd_syscall.compat_truncate64 ? {}
probe syscall.compat_truncate64.return = dw_syscall.compat_truncate64.return !,
                                         nd_syscall.compat_truncate64.return ? {}

# dw_compat_truncate64 _____________________________________________________

probe dw_syscall.compat_truncate64 =
	kernel.function("sys32_truncate64").call ?,
	kernel.function("compat_sys_x86_truncate64").call ?
{
        @_SYSCALL_COMPAT_TRUNCATE64_NAME
	path_uaddr = $filename
	path = user_string_quoted(path_uaddr)
        length = (($offset_high << 32) | $offset_low)
	@_SYSCALL_COMPAT_TRUNCATE64_ARGSTR
}
probe dw_syscall.compat_truncate64.return =
	kernel.function("sys32_truncate64").return ?,
	kernel.function("compat_sys_x86_truncate64").return ?
{
	@_SYSCALL_COMPAT_TRUNCATE64_NAME
	@SYSC_RETVALSTR($return)
}

# nd_compat_truncate64 _____________________________________________________

probe nd_syscall.compat_truncate64 = nd1_syscall.compat_truncate64!, nd2_syscall.compat_truncate64!, tp_syscall.compat_truncate64
  { }

probe nd1_syscall.compat_truncate64 =
	kprobe.function("sys32_truncate64") ?,
	kprobe.function("compat_sys_x86_truncate64") ?
{
	asmlinkage()
        @_SYSCALL_COMPAT_TRUNCATE64_NAME
	@_SYSCALL_COMPAT_TRUNCATE64_REGARGS
	@_SYSCALL_COMPAT_TRUNCATE64_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.compat_truncate64 =
	kprobe.function(@arch_syscall_prefix "compat_sys_x86_truncate64") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_COMPAT_TRUNCATE64_NAME
	@_SYSCALL_COMPAT_TRUNCATE64_REGARGS
	@_SYSCALL_COMPAT_TRUNCATE64_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.compat_truncate64 = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__compat_syscall_gate(@const("__NR_ia32_truncate64"))
	@_SYSCALL_COMPAT_TRUNCATE64_NAME
	@_SYSCALL_COMPAT_TRUNCATE64_REGARGS
	@_SYSCALL_COMPAT_TRUNCATE64_ARGSTR
}

probe nd_syscall.compat_truncate64.return = nd1_syscall.compat_truncate64.return!, nd2_syscall.compat_truncate64.return!, tp_syscall.compat_truncate64.return
  { }

probe nd1_syscall.compat_truncate64.return =
	kprobe.function("sys32_truncate64").return ?,
	kprobe.function("compat_sys_x86_truncate64").return ?
{
	@_SYSCALL_COMPAT_TRUNCATE64_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.compat_truncate64.return =
	kprobe.function(@arch_syscall_prefix "compat_sys_x86_truncate64").return ?
{
	@_SYSCALL_COMPAT_TRUNCATE64_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.compat_truncate64.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__compat_syscall_gate(@const("__NR_ia32_truncate64"))
	@_SYSCALL_COMPAT_TRUNCATE64_NAME
	@SYSC_RETVALSTR($ret)
}

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Editing: sysc_compat_truncate64.stp

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