Re: [PATCH v2 2/5] seccomp: make underlying bpf ref counted as well

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 09/11/2015 02:20 AM, Tycho Andersen wrote:
In the next patch, we're going to add a way to access the underlying
filters via bpf fds. This means that we need to ref-count both the
struct seccomp_filter objects and the struct bpf_prog objects separately,
in case a process dies but a filter is still referred to by another
process.

Additionally, we mark classic converted seccomp filters as seccomp eBPF
programs, since they are a subset of what is supported in seccomp eBPF.

Signed-off-by: Tycho Andersen <tycho.andersen@xxxxxxxxxxxxx>
CC: Kees Cook <keescook@xxxxxxxxxxxx>
CC: Will Drewry <wad@xxxxxxxxxxxx>
CC: Oleg Nesterov <oleg@xxxxxxxxxx>
CC: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
CC: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
CC: Serge E. Hallyn <serge.hallyn@xxxxxxxxxx>
CC: Alexei Starovoitov <ast@xxxxxxxxxx>
CC: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
---
  kernel/seccomp.c | 4 +++-
  1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/seccomp.c b/kernel/seccomp.c
index 245df6b..afaeddf 100644
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -378,6 +378,8 @@ static struct seccomp_filter *seccomp_prepare_filter(struct sock_fprog *fprog)
  	}

  	atomic_set(&sfilter->usage, 1);
+	atomic_set(&sfilter->prog->aux->refcnt, 1);
+	sfilter->prog->type = BPF_PROG_TYPE_SECCOMP;

So, if you do this, then this breaks the assumption of eBPF JITs
that, currently, all classic converted BPF programs always have a
prog->type of BPF_PROG_TYPE_UNSPEC (see: bpf_prog_was_classic()).

Currently, JITs make use of this information to determine whether
A and X mappings for such programs should or should not be cleared
in the prologue (s390 currently).

In the seccomp_prepare_filter() stage, we're already past that, so
it will not cause an issue, but we certainly would need to be very
careful in future, if bpf_prog_was_classic() is then used at a later
stage when we already have a generated bpf_prog somewhere, as then
this assumption will break.

  	return sfilter;
  }
@@ -470,7 +472,7 @@ void get_seccomp_filter(struct task_struct *tsk)
  static inline void seccomp_filter_free(struct seccomp_filter *filter)
  {
  	if (filter) {
-		bpf_prog_free(filter->prog);
+		bpf_prog_put(filter->prog);
  		kfree(filter);
  	}
  }


--
To unsubscribe from this list: send the line "unsubscribe linux-api" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux