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# brk ________________________________________________________
# unsigned long sys_brk(unsigned long brk)
@define _SYSCALL_BRK_NAME
%(
name = "brk"
%)
@define _SYSCALL_BRK_ARGSTR
%(
argstr = sprintf("%p", brk)
%)
@define _SYSCALL_BRK_REGARGS
%(
brk = ulong_arg(1)
%)
@define _SYSCALL_BRK_REGARGS_STORE
%(
if (@probewrite(brk))
set_ulong_arg(1, brk)
%)
probe syscall.brk = dw_syscall.brk !, nd_syscall.brk ? {}
probe syscall.brk.return = dw_syscall.brk.return !, nd_syscall.brk.return ? {}
# dw_brk _____________________________________________________
probe dw_syscall.brk = kernel.function("ia64_brk").call ?,
kernel.function("sys_brk").call
{
@_SYSCALL_BRK_NAME
brk = __ulong($brk)
@_SYSCALL_BRK_ARGSTR
}
probe dw_syscall.brk.return = kernel.function("ia64_brk").return ?,
kernel.function("sys_brk").return
{
@_SYSCALL_BRK_NAME
@SYSC_RETVALSTR($return)
}
# nd_brk _____________________________________________________
probe nd_syscall.brk = nd1_syscall.brk!, nd2_syscall.brk!, tp_syscall.brk
{ }
probe nd1_syscall.brk = kprobe.function("ia64_brk") ?,
kprobe.function("sys_brk") ?
{
@_SYSCALL_BRK_NAME
asmlinkage()
@_SYSCALL_BRK_REGARGS
@_SYSCALL_BRK_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.brk = kprobe.function(@arch_syscall_prefix "sys_brk")
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_BRK_NAME
@_SYSCALL_BRK_REGARGS
@_SYSCALL_BRK_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_BRK_REGARGS_STORE %)
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.brk = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_brk"), @const("__NR_compat_brk"))
@_SYSCALL_BRK_NAME
@_SYSCALL_BRK_REGARGS
@_SYSCALL_BRK_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_BRK_REGARGS_STORE %)
}
probe nd_syscall.brk.return = nd1_syscall.brk.return!, nd2_syscall.brk.return!, tp_syscall.brk.return
{ }
probe nd1_syscall.brk.return = kprobe.function("ia64_brk").return ?,
kprobe.function("sys_brk").return ?
{
@_SYSCALL_BRK_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.brk.return = kprobe.function(@arch_syscall_prefix "sys_brk").return
{
@_SYSCALL_BRK_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.brk.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_brk"), @const("__NR_compat_brk"))
@_SYSCALL_BRK_NAME
@SYSC_RETVALSTR($ret)
}
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