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The function sss_nss_mc_get_record return copy of record from memory
cache in last argument. Because we should not access data directly
to avoid problems with consistency of record.
The function sss_nss_mc_get_record also check whether length of record
is within data area (with macro MC_CHECK_RECORD_LENGTH)
However we also tried to do the same check in functions sss_nss_mc_get{gr, pw}*
Pointer to end of strings in record was compared to pointer to the end
of data table. But these two pointers are not within the same allocated area
and does not make sense to compare them. Sometimes record can be allocated
before mmaped area and sometime after. Sometimes it will return cached data
and other time will fall back to responder.
Resolves:
https://fedorahosted.org/sssd/ticket/2743
Reviewed-by: Michal Židek <mzidek@redhat.com>
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Thread safe initialisation was fixed in ticket #2380, but there is
still race condition in reinitialisation.
If caches is invalidated with command sss_cache -U (-G or -E) then
client code will need to reinitialize fast memory cache.
Let say we have two threads. The 1st thread find out that memory cache
should be reinitialized; therefore the fast memory cached is unmapped
and context destroyed. In the same time, 2nd thread tried to check
header of memory cache whether it is initialized and valid. As a result
of previously unmapped memory the 2nd thread access
out of bound memory (SEGFAULT).
The destroying of fast memory cache cannot be done any time. We need
to be sure that there isn't any other thread which uses mmaped memory.
The new counter of active threads was added for this purpose. The state
of fast memory cache was converted from boolean to three value state
(UNINITIALIZED, INITIALIZED, RECYCLED)
UNINITIALIZED
- the fast memory cache need to be initialized.
- if there is a problem with initialisation the state will not change
- after successful initialisation, the state will change to INITIALIZED
INITIALIZED
- if the cahe was invalidated or there is any other problem was
detected in memory cache header the state will change to RECYCLED
and memory cache IS NOT destroyed.
RECYCLED
- nothing will be done is there are any active threads which may use
the data from mmaped memory
- if there aren't active threads the fast memory cahe is destroyed and
state is changed to UNINITIALIZED.
https://fedorahosted.org/sssd/ticket/2445
Reviewed-by: Michal Židek <mzidek@redhat.com>
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Memory leak can happen with long living clients where there are records with
colliding hashes; usually LDAP servers with many users or groups.
Function sss_nss_mc_get_record allocates memory that is stored into "rec",
with next iteration variable rec is overriden with new record and old
one is lost and cannot be freed.
Example code flow:
src/sss_client/nss_mc_group.c:133: alloc_arg: "sss_nss_mc_get_record" allocates memory that is stored into "rec".
src/sss_client/nss_mc_common.c:216:13: alloc_fn: Storage is returned from allocation function "malloc".
src/sss_client/nss_mc_common.c:216:13: var_assign: Assigning: "copy_rec" = "malloc(rec_len)".
src/sss_client/nss_mc_common.c:225:9: noescape: Resource "copy_rec" is not freed or pointed-to in function "memcpy". [Note: The source code implementation of the function has been overridden by a builtin model.]
src/sss_client/nss_mc_common.c:239:5: var_assign: Assigning: "*_rec" = "copy_rec".
src/sss_client/nss_mc_group.c:163: noescape: Resource "rec" is not freed or pointed-to in "sss_nss_mc_next_slot_with_hash".
src/sss_client/nss_mc_common.c:294:60: noescape: "sss_nss_mc_next_slot_with_hash(struct sss_mc_rec *, uint32_t)" does not free or save its pointer parameter "rec".
src/sss_client/nss_mc_group.c:133: overwrite_var: Overwriting "rec" in call to "sss_nss_mc_get_record" leaks the storage that "rec" points to.
src/sss_client/nss_mc_common.c:239:5: write_notnull_to_parm: Assigning: "*_rec" = "copy_rec".
Reviewed-by: Michal Židek <mzidek@redhat.com>
Reviewed-by: Sumit Bose <sbose@redhat.com>
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struct sss_mc_rec had two hash members (hash1 and hash2) but only one next
member. This was a big problem in case of higher probability of hash collision.
structure sss_mc_rec will have two next members (next1, next2) with this patch.
next1 is related to hash1 and next2 is related to hash1.
Iterating over chains is changed, because we need to choose right next pointer.
Right next pointer will be chosen after comparing record hashes.
This behaviour is wrapped in function sss_mc_next_slot_with_hash.
Adding new record to chain is also changed. The situation is very similar to
iterating. We need to choose right next pointer (next1 or next2).
Right next pointer will be chosen after comparing record hashes.
Adding reference to next slot is wrapped in function
sss_mc_chain_slot_to_record_with_hash
Size of structure sss_mc_rec was increased from 32 bytes to 40 bytes.
Resolves:
https://fedorahosted.org/sssd/ticket/2049
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Removes off by one error when using macro MC_SIZE_TO_SLOTS
and adds new macro MC_SLOT_WITHIN_BOUNDS.
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We had pattern in client code with 3 conditions
that can be replaced with one.
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data->name value must be checked to prevent segfaults in
case of corrupted memory cache.
resolves:
https://fedorahosted.org/sssd/ticket/2018
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This patch prevents jumping outside of allocated memory in
case of corrupted slot or name_ptr values. It is not proper
solution, just hotfix until we find out what is the root cause
of ticket https://fedorahosted.org/sssd/ticket/2018
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