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SUNRPC: improve error response to over-size gss credential

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When the NFS server receives a large gss (kerberos) credential and tries
to pass it up to rpc.svcgssd (which is deprecated), it triggers an
infinite loop in cache_read().

cache_request() always returns -EAGAIN, and this causes a "goto again".

This patch:
 - changes the error to -E2BIG to avoid the infinite loop, and
 - generates a WARN_ONCE when rsi_request first sees an over-sized
   credential.  The warning suggests switching to gssproxy.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=196583
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
NeilBrown 2021-09-02 09:30:37 +10:00 committed by Chuck Lever
parent e38b3f2005
commit 0c217d5066
2 changed files with 3 additions and 1 deletions
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2
net/sunrpc/auth_gss/svcauth_gss.c
View file

@ -194,6 +194,8 @@ static void rsi_request(struct cache_detail *cd,
qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len);
qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len);
(*bpp)[-1] = '\n';
WARN_ONCE(*blen < 0,
"RPCSEC/GSS credential too large - please use gssproxy\n");
}
static int rsi_parse(struct cache_detail *cd,

2
net/sunrpc/cache.c
View file

@ -803,7 +803,7 @@ static int cache_request(struct cache_detail *detail,
detail->cache_request(detail, crq->item, &bp, &len);
if (len < 0)
return -EAGAIN;
return -E2BIG;
return PAGE_SIZE - len;
}