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# readdir ___________________________________________________
#
# long compat_sys_old_readdir(unsigned int fd, struct compat_old_linux_dirent __user *dirent, unsigned int count)
# int old32_readdir(unsigned int fd, struct old_linux_dirent32 *dirent, unsigned int count)
# long sys_old_readdir(unsigned int fd, struct old_linux_dirent __user *dirent, unsigned int count);
#
@define _SYSCALL_READDIR_NAME
%(
name = "readdir"
%)
@define _SYSCALL_READDIR_ARGSTR
%(
argstr = sprintf("%u, %p, %u", fd, dirent, count)
%)
@define _SYSCALL_READDIR_REGARGS
%(
fd = uint_arg(1)
dirent = pointer_arg(2)
count = uint_arg(3)
%)
probe syscall.readdir = dw_syscall.readdir !, nd_syscall.readdir ? {}
probe syscall.readdir.return = dw_syscall.readdir.return !,
nd_syscall.readdir.return ? {}
# dw_readdir _____________________________________________________
probe dw_syscall.readdir = kernel.function("compat_sys_old_readdir").call ?,
kernel.function("old32_readdir").call ?,
kernel.function("old_readdir").call ?,
kernel.function("sys_old_readdir").call ?
{
@_SYSCALL_READDIR_NAME
fd = __uint32($fd)
dirent = $dirent
count = __uint32($count)
@_SYSCALL_READDIR_ARGSTR
}
probe dw_syscall.readdir.return = kernel.function("compat_sys_old_readdir").return ?,
kernel.function("old32_readdir").return ?,
kernel.function("old_readdir").return ?,
kernel.function("sys_old_readdir").return ?
{
@_SYSCALL_READDIR_NAME
@SYSC_RETVALSTR($return)
}
# nd_readdir _____________________________________________________
probe nd_syscall.readdir = nd1_syscall.readdir!, nd2_syscall.readdir!, tp_syscall.readdir
{ }
probe nd1_syscall.readdir = kprobe.function("compat_sys_old_readdir") ?,
kprobe.function("old32_readdir") ?,
kprobe.function("old_readdir") ?,
kprobe.function("sys_old_readdir").call ?
{
@_SYSCALL_READDIR_NAME
asmlinkage()
@_SYSCALL_READDIR_REGARGS
@_SYSCALL_READDIR_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.readdir = kprobe.function(@arch_syscall_prefix "compat_sys_old_readdir") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_READDIR_NAME
@_SYSCALL_READDIR_REGARGS
@_SYSCALL_READDIR_ARGSTR
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.readdir = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_readdir"), @const("__NR_compat_readdir"))
@_SYSCALL_READDIR_NAME
@_SYSCALL_READDIR_REGARGS
@_SYSCALL_READDIR_ARGSTR
}
probe nd_syscall.readdir.return = nd1_syscall.readdir.return!, nd2_syscall.readdir.return!, tp_syscall.readdir.return
{ }
probe nd1_syscall.readdir.return = kprobe.function("compat_sys_old_readdir").return ?,
kprobe.function("old32_readdir").return ?,
kprobe.function("old_readdir").return ?,
kprobe.function("sys_old_readdir").return ?
{
@_SYSCALL_READDIR_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.readdir.return = kprobe.function(@arch_syscall_prefix "compat_sys_old_readdir").return ?
{
@_SYSCALL_READDIR_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.readdir.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_readdir"), @const("__NR_compat_readdir"))
@_SYSCALL_READDIR_NAME
@SYSC_RETVALSTR($ret)
}
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