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Fix the SMB2 showstopper, found by an extended torture test from Volker.

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In the oplock refactoring, the algorithm underwent an unnoticed change.
In 3.5.x stat_opens were silently (i.e. no explicit code had comments
explaining this) ignored when looking for oplock breaks and share mode
violations. After the refactoring, the function find_oplock_types()
no longer ignored stat_open entries in the share mode table when looking
for batch and exclusive oplocks. This patch adds two changes to find_oplock_types()
to ignore the case where the incoming open request is a stat open being
tested against existing opens, and also when the incoming open request
is a non-stat open being tested against existing stat opens. Neither
of these cause an oplock break or share mode violation. Thanks a *lot*
to Volker, who persevered in reproducing this problem.

Autobuild-User: Jeremy Allison <jra@samba.org>
Autobuild-Date: Mon May 16 22:38:20 CEST 2011 on sn-devel-104
This commit is contained in:
Jeremy Allison 2011-05-16 12:20:14 -07:00
parent fe21bdc43c
commit 8cf14c21b3
1 changed files with 25 additions and 3 deletions
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28
source3/smbd/open.c
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@ -949,7 +949,9 @@ static NTSTATUS send_break_message(files_struct *fsp,
* Do internal consistency checks on the share mode for a file.
*/
static void find_oplock_types(struct share_mode_lock *lck,
static void find_oplock_types(files_struct *fsp,
int oplock_request,
struct share_mode_lock *lck,
struct share_mode_entry **pp_batch,
struct share_mode_entry **pp_ex_or_batch,
bool *got_level2,
@ -962,11 +964,27 @@ static void find_oplock_types(struct share_mode_lock *lck,
*got_level2 = false;
*got_no_oplock = false;
/* Ignore stat or internal opens, as is done in
delay_for_batch_oplocks() and
delay_for_exclusive_oplocks().
*/
if ((oplock_request & INTERNAL_OPEN_ONLY) || is_stat_open(fsp->access_mask)) {
return;
}
for (i=0; i<lck->num_share_modes; i++) {
if (!is_valid_share_mode_entry(&lck->share_modes[i])) {
continue;
}
if (lck->share_modes[i].op_type == NO_OPLOCK &&
is_stat_open(lck->share_modes[i].access_mask)) {
/* We ignore stat opens in the table - they
always have NO_OPLOCK and never get or
cause breaks. JRA. */
continue;
}
if (BATCH_OPLOCK_TYPE(lck->share_modes[i].op_type)) {
/* batch - can only be one. */
if (*pp_ex_or_batch || *pp_batch || *got_level2 || *got_no_oplock) {
@ -1906,7 +1924,9 @@ static NTSTATUS open_file_ntcreate(connection_struct *conn,
}
/* Get the types we need to examine. */
find_oplock_types(lck,
find_oplock_types(fsp,
oplock_request,
lck,
&batch_entry,
&exclusive_entry,
&got_level2_oplock,
@ -2151,7 +2171,9 @@ static NTSTATUS open_file_ntcreate(connection_struct *conn,
}
/* Get the types we need to examine. */
find_oplock_types(lck,
find_oplock_types(fsp,
oplock_request,
lck,
&batch_entry,
&exclusive_entry,
&got_level2_oplock,