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# getxattr ___________________________________________________
# ssize_t sys_getxattr(char __user *path, char __user *name,
# void __user *value, size_t size)
@define _SYSCALL_GETXATTR_NAME
%(
name = "getxattr"
%)
@define _SYSCALL_GETXATTR_ARGSTR
%(
argstr = sprintf("%s, %s, %p, %u", path, name_str, value_uaddr, size)
%)
@define _SYSCALL_GETXATTR_REGARGS
%(
path = user_string_quoted(pointer_arg(1))
path_unquoted = user_string_nofault(pointer_arg(1))
# 'name2' should have been 'name_str'. Deprecate the old name.
%(systemtap_v <= "1.4" %?
name2 = user_string_quoted(pointer_arg(2))
name2_unquoted = user_string_nofault(pointer_arg(2))
%)
name_str = user_string_quoted(pointer_arg(2))
name_str_unquoted = user_string_nofault(pointer_arg(2))
value_uaddr = pointer_arg(3)
size = ulong_arg(4)
%)
@define _SYSCALL_GETXATTR_REGARGS_STORE
%(
if (@probewrite(path_unquoted))
set_user_string_arg(pointer_arg(1), path_unquoted)
%(systemtap_v <= "1.4" %?
if (@probewrite(name2_unquoted))
set_user_string_arg(pointer_arg(2), name2_unquoted)
%)
if (@probewrite(name_str_unquoted))
set_user_string_arg(pointer_arg(2), name_str_unquoted)
if (@probewrite(value_uaddr))
set_pointer_arg(3, value_uaddr)
if (@probewrite(size))
set_ulong_arg(4, size)
%)
probe syscall.getxattr = dw_syscall.getxattr !,
nd_syscall.getxattr ? {}
probe syscall.getxattr.return = dw_syscall.getxattr.return !,
nd_syscall.getxattr.return ? {}
# dw_getxattr _____________________________________________________
probe dw_syscall.getxattr = kernel.function("sys_getxattr").call
{
@_SYSCALL_GETXATTR_NAME
path = user_string_quoted(@choose_defined($pathname, $path))
# 'name2' should have been 'name_str'. Deprecate the old name.
%(systemtap_v <= "1.4" %?
name2 = user_string_quoted($name)
%)
name_str = user_string_quoted($name)
value_uaddr = $value
size = __ulong($size)
@_SYSCALL_GETXATTR_ARGSTR
}
probe dw_syscall.getxattr.return = kernel.function("sys_getxattr").return
{
@_SYSCALL_GETXATTR_NAME
@SYSC_RETVALSTR($return)
}
# nd_getxattr _____________________________________________________
probe nd_syscall.getxattr = nd1_syscall.getxattr!, nd2_syscall.getxattr!, tp_syscall.getxattr
{ }
probe nd1_syscall.getxattr = kprobe.function("sys_getxattr") ?
{
@_SYSCALL_GETXATTR_NAME
asmlinkage()
@_SYSCALL_GETXATTR_REGARGS
@_SYSCALL_GETXATTR_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.getxattr = kprobe.function(@arch_syscall_prefix "sys_getxattr") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_GETXATTR_NAME
@_SYSCALL_GETXATTR_REGARGS
@_SYSCALL_GETXATTR_ARGSTR
},
{
@_SYSCALL_GETXATTR_REGARGS_STORE
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.getxattr = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_getxattr"), @const("__NR_compat_getxattr"))
@_SYSCALL_GETXATTR_NAME
@_SYSCALL_GETXATTR_REGARGS
@_SYSCALL_GETXATTR_ARGSTR
},
{
@_SYSCALL_GETXATTR_REGARGS_STORE
}
probe nd_syscall.getxattr.return = nd1_syscall.getxattr.return!, nd2_syscall.getxattr.return!, tp_syscall.getxattr.return
{ }
probe nd1_syscall.getxattr.return = kprobe.function("sys_getxattr").return ?
{
@_SYSCALL_GETXATTR_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.getxattr.return = kprobe.function(@arch_syscall_prefix "sys_getxattr").return ?
{
@_SYSCALL_GETXATTR_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.getxattr.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_getxattr"), @const("__NR_compat_getxattr"))
@_SYSCALL_GETXATTR_NAME
@SYSC_RETVALSTR($ret)
}
|
