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# fchmodat ___________________________________________________
# new function with 2.6.16
# long sys_fchmodat(int dfd, const char __user *filename,
# mode_t mode)
@define _SYSCALL_FCHMODAT_NAME
%(
name = "fchmodat"
%)
@define _SYSCALL_FCHMODAT_ARGSTR
%(
argstr = sprintf("%s, %s, %#o", dirfd_str, pathname, mode)
%)
@define _SYSCALL_FCHMODAT_REGARGS
%(
dirfd = int_arg(1)
dirfd_str = _dfd_str(dirfd)
pathname = user_string_quoted(pointer_arg(2))
pathname_unquoted = user_string_nofault(pointer_arg(2))
mode = uint_arg(3)
%)
@define _SYSCALL_FCHMODAT_REGARGS_STORE
%(
if (@probewrite(dirfd))
set_int_arg(1, dirfd)
if (@probewrite(pathname_unquoted))
set_user_string_arg(pointer_arg(2), pathname_unquoted)
if (@probewrite(mode))
set_uint_arg(3, mode)
%)
probe syscall.fchmodat = dw_syscall.fchmodat !, nd_syscall.fchmodat ? {}
probe syscall.fchmodat.return = dw_syscall.fchmodat.return !, nd_syscall.fchmodat.return ? {}
# dw_fchmodat _____________________________________________________
probe dw_syscall.fchmodat = kernel.function("sys_fchmodat").call ?
{
@__syscall_compat_gate(@const("__NR_fchmodat"),
@const("__NR_compat_fchmodat"))
@_SYSCALL_FCHMODAT_NAME
dirfd = __int32($dfd)
dirfd_str = _dfd_str(__int32($dfd))
pathname = user_string_quoted($filename)
%( arch == "i386" %?
# Why @cast() here? Even though the user passes an unsigned
# int (32-bits), some kernels (2.6.32-431.el6.i686) get an
# unsigned short (16-bits).
mode = @uint_cast(&$mode)
%:
mode = __uint32($mode)
%)
@_SYSCALL_FCHMODAT_ARGSTR
}
probe dw_syscall.fchmodat.return = kernel.function("sys_fchmodat").return ?
{
@__syscall_compat_gate(@const("__NR_fchmodat"),
@const("__NR_compat_fchmodat"))
@_SYSCALL_FCHMODAT_NAME
@SYSC_RETVALSTR($return)
}
# nd_fchmodat _____________________________________________________
probe nd_syscall.fchmodat = nd1_syscall.fchmodat!, nd2_syscall.fchmodat!, tp_syscall.fchmodat
{ }
probe nd1_syscall.fchmodat = kprobe.function("sys_fchmodat") ?
{
@__syscall_compat_gate(@const("__NR_fchmodat"),
@const("__NR_compat_fchmodat"))
@_SYSCALL_FCHMODAT_NAME
asmlinkage()
@_SYSCALL_FCHMODAT_REGARGS
@_SYSCALL_FCHMODAT_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.fchmodat = kprobe.function(@arch_syscall_prefix "sys_fchmodat") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_FCHMODAT_NAME
@_SYSCALL_FCHMODAT_REGARGS
@_SYSCALL_FCHMODAT_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_FCHMODAT_REGARGS_STORE %)
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.fchmodat = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_fchmodat"), @const("__NR_compat_fchmodat"))
@_SYSCALL_FCHMODAT_NAME
@_SYSCALL_FCHMODAT_REGARGS
@_SYSCALL_FCHMODAT_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_FCHMODAT_REGARGS_STORE %)
}
probe nd_syscall.fchmodat.return = nd1_syscall.fchmodat.return!, nd2_syscall.fchmodat.return!, tp_syscall.fchmodat.return
{ }
probe nd1_syscall.fchmodat.return = kprobe.function("sys_fchmodat").return ?
{
@__syscall_compat_gate(@const("__NR_fchmodat"),
@const("__NR_compat_fchmodat"))
@_SYSCALL_FCHMODAT_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.fchmodat.return = kprobe.function(@arch_syscall_prefix "sys_fchmodat").return ?
{
@_SYSCALL_FCHMODAT_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.fchmodat.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_fchmodat"), @const("__NR_compat_fchmodat"))
@_SYSCALL_FCHMODAT_NAME
@SYSC_RETVALSTR($ret)
}
|
