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Don't allow one to trace an ancestor when already traced.

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PR: kern/29741
Submitted by: Dave Zarzycki <zarzycki@FreeBSD.org>
Fix from: Tim J. Robbins <tim@robbins.dropbear.id.au>
MFC After: 2 weeks
This commit is contained in:
Alfred Perlstein 2002-04-14 17:12:55 +00:00
parent 51a7b740a1
commit 46e12b42fe
1 changed files with 14 additions and 1 deletions
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15
sys/kern/sys_process.c
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@ -332,11 +332,13 @@ ptrace(struct thread *td, struct ptrace_args *uap)
struct fpreg fpreg;
struct reg reg;
} r;
struct proc *p;
struct proc *curp, *p, *pp;
struct thread *td2;
int error, write;
int proctree_locked = 0;
curp = td->td_proc;
/*
* Do copyin() early before getting locks and lock proctree before
* locking the process.
@ -422,6 +424,17 @@ ptrace(struct thread *td, struct ptrace_args *uap)
goto fail;
}
/* Can't trace an ancestor if you're being traced. */
if (curp->p_flag & P_TRACED) {
for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) {
if (pp == p) {
error = EINVAL;
goto fail;
}
}
}
/* OK */
break;