diff options
| author | kib <kib@FreeBSD.org> | 2015-11-03 08:31:01 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2015-11-03 08:31:01 +0000 |
| commit | 4042a41aefa37363843b47eb3c9750e91c6dd37a (patch) | |
| tree | 6333081fd943c7cf5717fa150dfba6e6e3158974 /sys/kern | |
| parent | 5e283417b20f49343d939a29a2343b558c6c4221 (diff) | |
| download | FreeBSD-src-4042a41aefa37363843b47eb3c9750e91c6dd37a.zip FreeBSD-src-4042a41aefa37363843b47eb3c9750e91c6dd37a.tar.gz | |
MFC r289660,r289664:
Do not allow to execute ptrace(PT_TRACE_ME) when the process is
already traced or when there is no parent which can trace the process.
Diffstat (limited to 'sys/kern')
| -rw-r--r-- | sys/kern/sys_process.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/sys/kern/sys_process.c b/sys/kern/sys_process.c index a3a861f..5efec4f 100644 --- a/sys/kern/sys_process.c +++ b/sys/kern/sys_process.c @@ -442,7 +442,7 @@ 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) { @@ -743,7 +743,18 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data) */ switch (req) { case PT_TRACE_ME: - /* Always legal. */ + /* + * Always legal, when there is a parent process which + * could trace us. Otherwise, reject. + */ + if ((p->p_flag & P_TRACED) != 0) { + error = EBUSY; + goto fail; + } + if (p->p_pptr == initproc) { + error = EPERM; + goto fail; + } break; case PT_ATTACH: |
