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new helper: uaccess_kernel()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2017-03-20 21:08:07 -04:00
parent aaa2e7ac80
commit db68ce10c4
32 changed files with 44 additions and 42 deletions
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kernel/trace/bpf_trace.c
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@@ -96,7 +96,7 @@ BPF_CALL_3(bpf_probe_write_user, void *, unsafe_ptr, const void *, src,
if (unlikely(in_interrupt() ||
current->flags & (PF_KTHREAD | PF_EXITING)))
return -EPERM;
if (unlikely(segment_eq(get_fs(), KERNEL_DS)))
if (unlikely(uaccess_kernel()))
return -EPERM;
if (!access_ok(VERIFY_WRITE, unsafe_ptr, size))
return -EPERM;