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r289660:

Do not allow to execute ptrace(PT_TRACE_ME) when the process is
already traced.

Do not allow to execute ptrace(PT_TRACE_ME) when there is no parent
which can trace the process, i.e. when the parent is already init.
Note that after the PT_TRACE_ME request the process is unkillable and
non-continuable until a debugger is attached, or parent is killed, the
later clears P_TRACED state.  Since init clearly would not debug the
caller, and cannot be killed, disallow creation of unkillable
processes.

Reviewed by:	jhb, pho
Reported and tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
Differential revision:	https://reviews.freebsd.org/D3908
This commit is contained in:
kib 2015-10-20 20:38:20 +00:00
parent 235f7c0a8e
commit f2fc8e1816
1 changed files with 1 additions and 1 deletions
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2
sys/kern/sys_process.c
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@ -443,7 +443,7 @@ ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve)
}
#ifdef COMPAT_FREEBSD32
static int
static int
ptrace_vm_entry32(struct thread *td, struct proc *p,
struct ptrace_vm_entry32 *pve32)
{