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UPSTREAM: bpf: relax inode permission check for retrieving bpf program

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For iptable module to load a bpf program from a pinned location, it
only retrieve a loaded program and cannot change the program content so
requiring a write permission for it might not be necessary.
Also when adding or removing an unrelated iptable rule, it might need to
flush and reload the xt_bpf related rules as well and triggers the inode
permission check. It might be better to remove the write premission
check for the inode so we won't need to grant write access to all the
processes that flush and restore iptables rules.

Signed-off-by: Chenbo Feng <fengc@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
(cherry picked from commit e547ff3f803e779a3898f1f48447b29f43c54085)

Bug: 129650054
Change-Id: I71487ad6f4d22e0a8be3757d9b72d1c04c92104d
(cherry picked from commit 9e74c1b9e8418aa0209b15db24f0b3d4876f52aa)
This commit is contained in:
Chenbo Feng 2019-05-14 19:42:57 -07:00 committed by Maciej Żenczykowski
parent 1c0ac5e9bf
commit 7453f2852a
1 changed files with 1 additions and 1 deletions
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2
kernel/bpf/inode.c
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@ -372,7 +372,7 @@ out:
static struct bpf_prog *__get_prog_inode(struct inode *inode, enum bpf_prog_type type)
{
struct bpf_prog *prog;
int ret = inode_permission(inode, MAY_READ | MAY_WRITE);
int ret = inode_permission(inode, MAY_READ);
if (ret)
return ERR_PTR(ret);