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# writev _____________________________________________________
#
# ssize_t sys_writev(unsigned long fd,
# const struct iovec __user *vec,
# unsigned long vlen)
# ssize_t compat_sys_writev(unsigned long fd,
# const struct compat_iovec __user *vec,
# unsigned long vlen)
#
@define _SYSCALL_WRITEV_NAME
%(
name = "writev"
%)
@define _SYSCALL_WRITEV_ARGSTR
%(
argstr = sprintf("%d, %p, %d", fd, vector_uaddr, count)
%)
@define _SYSCALL_WRITEV_REGARGS
%(
vector_uaddr = pointer_arg(2)
count = int_arg(3)
fd = int_arg(1)
%)
probe syscall.writev = dw_syscall.writev !, nd_syscall.writev ? {}
probe syscall.writev.return = dw_syscall.writev.return !,
nd_syscall.writev.return ? {}
# dw_writev _____________________________________________________
probe dw_syscall.writev = kernel.function("compat_sys_writev").call ?,
kernel.function("sys_writev").call
{
@_SYSCALL_WRITEV_NAME
vector_uaddr = $vec
count = __int32($vlen)
# Although the kernel gets an unsigned long fd, on the
# user-side it is a signed int. Fix this.
fd = __int32($fd)
@_SYSCALL_WRITEV_ARGSTR
}
probe dw_syscall.writev.return = kernel.function("compat_sys_writev").return ?,
kernel.function("sys_writev").return
{
@_SYSCALL_WRITEV_NAME
@SYSC_RETVALSTR($return)
}
# nd_writev _____________________________________________________
probe nd_syscall.writev = nd1_syscall.writev!, nd2_syscall.writev!, tp_syscall.writev
{ }
probe nd1_syscall.writev = kprobe.function("compat_sys_writev") ?,
kprobe.function("sys_writev") ?
{
@_SYSCALL_WRITEV_NAME
asmlinkage()
@_SYSCALL_WRITEV_REGARGS
@_SYSCALL_WRITEV_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.writev = kprobe.function(@arch_syscall_prefix "compat_sys_writev") ?,
kprobe.function(@arch_syscall_prefix "sys_writev") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_WRITEV_NAME
@_SYSCALL_WRITEV_REGARGS
@_SYSCALL_WRITEV_ARGSTR
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.writev = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_writev"), @const("__NR_compat_writev"))
@_SYSCALL_WRITEV_NAME
@_SYSCALL_WRITEV_REGARGS
@_SYSCALL_WRITEV_ARGSTR
}
probe nd_syscall.writev.return = nd1_syscall.writev.return!, nd2_syscall.writev.return!, tp_syscall.writev.return
{ }
probe nd1_syscall.writev.return = kprobe.function("compat_sys_writev").return ?,
kprobe.function("sys_writev").return ?
{
@_SYSCALL_WRITEV_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.writev.return = kprobe.function(@arch_syscall_prefix "compat_sys_writev").return ?,
kprobe.function(@arch_syscall_prefix "sys_writev").return ?
{
@_SYSCALL_WRITEV_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.writev.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_writev"), @const("__NR_compat_writev"))
@_SYSCALL_WRITEV_NAME
@SYSC_RETVALSTR($ret)
}
|
