releases/4.19.46/bpf-relax-inode-permission-check-for-retrieving-bpf-program.patch

   1 From e547ff3f803e779a3898f1f48447b29f43c54085 Mon Sep 17 00:00:00 2001
   2 From: Chenbo Feng <fengc@google.com>
   3 Date: Tue, 14 May 2019 19:42:57 -0700
   4 Subject: bpf: relax inode permission check for retrieving bpf program
   5
   6 From: Chenbo Feng <fengc@google.com>
   7
   8 commit e547ff3f803e779a3898f1f48447b29f43c54085 upstream.
   9
  10 For iptable module to load a bpf program from a pinned location, it
  11 only retrieve a loaded program and cannot change the program content so
  12 requiring a write permission for it might not be necessary.
  13 Also when adding or removing an unrelated iptable rule, it might need to
  14 flush and reload the xt_bpf related rules as well and triggers the inode
  15 permission check. It might be better to remove the write premission
  16 check for the inode so we won't need to grant write access to all the
  17 processes that flush and restore iptables rules.
  18
  19 Signed-off-by: Chenbo Feng <fengc@google.com>
  20 Signed-off-by: Alexei Starovoitov <ast@kernel.org>
  21 Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
  22 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  23
  24 ---
  25  kernel/bpf/inode.c |    2 +-
  26  1 file changed, 1 insertion(+), 1 deletion(-)
  27
  28 --- a/kernel/bpf/inode.c
  29 +++ b/kernel/bpf/inode.c
  30 @@ -518,7 +518,7 @@ out:
  31  static struct bpf_prog *__get_prog_inode(struct inode *inode, enum bpf_prog_type type)
  32  {
  33         struct bpf_prog *prog;
  34 -       int ret = inode_permission(inode, MAY_READ | MAY_WRITE);
  35 +       int ret = inode_permission(inode, MAY_READ);
  36         if (ret)
  37                 return ERR_PTR(ret);
  38