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| author | J. Bruce Fields <bfields@fieldses.org> | 2006-12-04 20:22:32 -0500 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2006-12-06 10:46:43 -0500 |
| commit | 87d918d667e51962938392759aef6ca368d6e96d (patch) | |
| tree | b501911296997106c226b53c486a4e61d629d2a6 | |
| parent | 8fc7500bb8ea3b5c909869d00628635e964ae882 (diff) | |
| download | linux-3.10-87d918d667e51962938392759aef6ca368d6e96d.tar.gz linux-3.10-87d918d667e51962938392759aef6ca368d6e96d.tar.bz2 linux-3.10-87d918d667e51962938392759aef6ca368d6e96d.zip | |
rpc: gss: fix a kmap_atomic race in krb5 code
This code is never called from interrupt context; it's always run by either
a user thread or rpciod. So KM_SKB_SUNRPC_DATA is inappropriate here.
Thanks to Aimé Le Rouzic for capturing an oops which showed the kernel
taking an interrupt while we were in this piece of code, resulting in a
nested kmap_atomic(.,KM_SKB_SUNRPC_DATA) call from
xdr_partial_copy_from_skb().
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| -rw-r--r-- | net/sunrpc/auth_gss/gss_krb5_wrap.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/sunrpc/auth_gss/gss_krb5_wrap.c b/net/sunrpc/auth_gss/gss_krb5_wrap.c index 0f512e8e0d1..ad243872f54 100644 --- a/net/sunrpc/auth_gss/gss_krb5_wrap.c +++ b/net/sunrpc/auth_gss/gss_krb5_wrap.c @@ -57,9 +57,9 @@ gss_krb5_remove_padding(struct xdr_buf *buf, int blocksize) >>PAGE_CACHE_SHIFT; int offset = (buf->page_base + len - 1) & (PAGE_CACHE_SIZE - 1); - ptr = kmap_atomic(buf->pages[last], KM_SKB_SUNRPC_DATA); + ptr = kmap_atomic(buf->pages[last], KM_USER0); pad = *(ptr + offset); - kunmap_atomic(ptr, KM_SKB_SUNRPC_DATA); + kunmap_atomic(ptr, KM_USER0); goto out; } else len -= buf->page_len; |