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commit bc8f194c8c29e46e8ee4034f06e46988dfff38f7
Author: Siddhesh Poyarekar <siddhesh@redhat.com>
Date: Wed Apr 30 12:00:39 2014 +0530
Initialize all of datahead structure in nscd (BZ #16791)
The datahead structure has an unused padding field that remains
uninitialized. Valgrind prints out a warning for it on querying a
netgroups entry. This is harmless, but is a potential data leak since
it would result in writing out an uninitialized byte to the cache
file. Besides, this happens only when there is a cache miss, so we're
not adding computation to any fast path.
commit 1cdeb2372ddecac0dfe0c132a033e9590ffa07d2
Author: Siddhesh Poyarekar <siddhesh@redhat.com>
Date: Wed Apr 30 11:57:09 2014 +0530
Consolidate code to initialize nscd dataset header
This patch consolidates the code to initialize the header of a dataset
into a single set of functions (one for positive and another for
negative datasets) primarily to reduce repetition of code. The
secondary reason is to simplify Patch 2/2 which fixes the problem of
an uninitialized byte in the header by initializing an unused field in
the structure and hence preventing a possible data leak into the cache
file.
diff --git glibc-2.17-c758a686/nscd/aicache.c glibc-2.17-c758a686/nscd/aicache.c
index 98d40a1..d7966bd 100644
--- glibc-2.17-c758a686/nscd/aicache.c
+++ glibc-2.17-c758a686/nscd/aicache.c
@@ -383,17 +383,12 @@ addhstaiX (struct database_dyn *db, int fd, request_header *req,
cp = family;
}
- /* Fill in the rest of the dataset. */
- dataset->head.allocsize = total + req->key_len;
- dataset->head.recsize = total - offsetof (struct dataset, resp);
- dataset->head.notfound = false;
- dataset->head.nreloads = he == NULL ? 0 : (dh->nreloads + 1);
- dataset->head.usable = true;
-
- /* Compute the timeout time. */
- dataset->head.ttl = ttl == INT32_MAX ? db->postimeout : ttl;
- timeout = dataset->head.timeout = time (NULL) + dataset->head.ttl;
+ timeout = datahead_init_pos (&dataset->head, total + req->key_len,
+ total - offsetof (struct dataset, resp),
+ he == NULL ? 0 : dh->nreloads + 1,
+ ttl == INT32_MAX ? db->postimeout : ttl);
+ /* Fill in the rest of the dataset. */
dataset->resp.version = NSCD_VERSION;
dataset->resp.found = 1;
dataset->resp.naddrs = naddrs;
@@ -528,15 +523,9 @@ next_nip:
else if ((dataset = mempool_alloc (db, (sizeof (struct dataset)
+ req->key_len), 1)) != NULL)
{
- dataset->head.allocsize = sizeof (struct dataset) + req->key_len;
- dataset->head.recsize = total;
- dataset->head.notfound = true;
- dataset->head.nreloads = 0;
- dataset->head.usable = true;
-
- /* Compute the timeout time. */
- timeout = dataset->head.timeout = time (NULL) + db->negtimeout;
- dataset->head.ttl = db->negtimeout;
+ timeout = datahead_init_neg (&dataset->head,
+ sizeof (struct dataset) + req->key_len,
+ total, db->negtimeout);
/* This is the reply. */
memcpy (&dataset->resp, &notfound, total);
diff --git glibc-2.17-c758a686/nscd/grpcache.c glibc-2.17-c758a686/nscd/grpcache.c
index b5a33eb..df59fa7 100644
--- glibc-2.17-c758a686/nscd/grpcache.c
+++ glibc-2.17-c758a686/nscd/grpcache.c
@@ -128,14 +128,10 @@ cache_addgr (struct database_dyn *db, int fd, request_header *req,
}
else if ((dataset = mempool_alloc (db, sizeof (struct dataset) + req->key_len, 1)) != NULL)
{
- dataset->head.allocsize = sizeof (struct dataset) + req->key_len;
- dataset->head.recsize = total;
- dataset->head.notfound = true;
- dataset->head.nreloads = 0;
- dataset->head.usable = true;
-
- /* Compute the timeout time. */
- timeout = dataset->head.timeout = t + db->negtimeout;
+ timeout = datahead_init_neg (&dataset->head,
+ (sizeof (struct dataset)
+ + req->key_len), total,
+ db->negtimeout);
/* This is the reply. */
memcpy (&dataset->resp, &notfound, total);
@@ -232,14 +228,10 @@ cache_addgr (struct database_dyn *db, int fd, request_header *req,
dataset_temporary = true;
}
- dataset->head.allocsize = total + n;
- dataset->head.recsize = total - offsetof (struct dataset, resp);
- dataset->head.notfound = false;
- dataset->head.nreloads = he == NULL ? 0 : (dh->nreloads + 1);
- dataset->head.usable = true;
-
- /* Compute the timeout time. */
- timeout = dataset->head.timeout = t + db->postimeout;
+ timeout = datahead_init_pos (&dataset->head, total + n,
+ total - offsetof (struct dataset, resp),
+ he == NULL ? 0 : dh->nreloads + 1,
+ db->postimeout);
dataset->resp.version = NSCD_VERSION;
dataset->resp.found = 1;
diff --git glibc-2.17-c758a686/nscd/hstcache.c glibc-2.17-c758a686/nscd/hstcache.c
index a79b67a..d4f1ad2 100644
--- glibc-2.17-c758a686/nscd/hstcache.c
+++ glibc-2.17-c758a686/nscd/hstcache.c
@@ -152,15 +152,11 @@ cache_addhst (struct database_dyn *db, int fd, request_header *req,
else if ((dataset = mempool_alloc (db, (sizeof (struct dataset)
+ req->key_len), 1)) != NULL)
{
- dataset->head.allocsize = sizeof (struct dataset) + req->key_len;
- dataset->head.recsize = total;
- dataset->head.notfound = true;
- dataset->head.nreloads = 0;
- dataset->head.usable = true;
-
- /* Compute the timeout time. */
- dataset->head.ttl = ttl == INT32_MAX ? db->negtimeout : ttl;
- timeout = dataset->head.timeout = t + dataset->head.ttl;
+ timeout = datahead_init_neg (&dataset->head,
+ (sizeof (struct dataset)
+ + req->key_len), total,
+ (ttl == INT32_MAX
+ ? db->negtimeout : ttl));
/* This is the reply. */
memcpy (&dataset->resp, resp, total);
@@ -257,15 +253,10 @@ cache_addhst (struct database_dyn *db, int fd, request_header *req,
alloca_used = true;
}
- dataset->head.allocsize = total + req->key_len;
- dataset->head.recsize = total - offsetof (struct dataset, resp);
- dataset->head.notfound = false;
- dataset->head.nreloads = he == NULL ? 0 : (dh->nreloads + 1);
- dataset->head.usable = true;
-
- /* Compute the timeout time. */
- dataset->head.ttl = ttl == INT32_MAX ? db->postimeout : ttl;
- timeout = dataset->head.timeout = t + dataset->head.ttl;
+ timeout = datahead_init_pos (&dataset->head, total + req->key_len,
+ total - offsetof (struct dataset, resp),
+ he == NULL ? 0 : dh->nreloads + 1,
+ ttl == INT32_MAX ? db->postimeout : ttl);
dataset->resp.version = NSCD_VERSION;
dataset->resp.found = 1;
diff --git glibc-2.17-c758a686/nscd/initgrcache.c glibc-2.17-c758a686/nscd/initgrcache.c
index 1bf9f0d..361319f 100644
--- glibc-2.17-c758a686/nscd/initgrcache.c
+++ glibc-2.17-c758a686/nscd/initgrcache.c
@@ -213,14 +213,10 @@ addinitgroupsX (struct database_dyn *db, int fd, request_header *req,
else if ((dataset = mempool_alloc (db, (sizeof (struct dataset)
+ req->key_len), 1)) != NULL)
{
- dataset->head.allocsize = sizeof (struct dataset) + req->key_len;
- dataset->head.recsize = total;
- dataset->head.notfound = true;
- dataset->head.nreloads = 0;
- dataset->head.usable = true;
-
- /* Compute the timeout time. */
- timeout = dataset->head.timeout = time (NULL) + db->negtimeout;
+ timeout = datahead_init_neg (&dataset->head,
+ (sizeof (struct dataset)
+ + req->key_len), total,
+ db->negtimeout);
/* This is the reply. */
memcpy (&dataset->resp, &notfound, total);
@@ -276,14 +272,10 @@ addinitgroupsX (struct database_dyn *db, int fd, request_header *req,
alloca_used = true;
}
- dataset->head.allocsize = total + req->key_len;
- dataset->head.recsize = total - offsetof (struct dataset, resp);
- dataset->head.notfound = false;
- dataset->head.nreloads = he == NULL ? 0 : (dh->nreloads + 1);
- dataset->head.usable = true;
-
- /* Compute the timeout time. */
- timeout = dataset->head.timeout = time (NULL) + db->postimeout;
+ timeout = datahead_init_pos (&dataset->head, total + req->key_len,
+ total - offsetof (struct dataset, resp),
+ he == NULL ? 0 : dh->nreloads + 1,
+ db->postimeout);
dataset->resp.version = NSCD_VERSION;
dataset->resp.found = 1;
diff --git glibc-2.17-c758a686/nscd/netgroupcache.c glibc-2.17-c758a686/nscd/netgroupcache.c
index 820d823..b3d40e9 100644
--- glibc-2.17-c758a686/nscd/netgroupcache.c
+++ glibc-2.17-c758a686/nscd/netgroupcache.c
@@ -90,15 +90,9 @@ do_notfound (struct database_dyn *db, int fd, request_header *req,
/* If we cannot permanently store the result, so be it. */
if (dataset != NULL)
{
- dataset->head.allocsize = sizeof (struct dataset) + req->key_len;
- dataset->head.recsize = total;
- dataset->head.notfound = true;
- dataset->head.nreloads = 0;
- dataset->head.usable = true;
-
- /* Compute the timeout time. */
- timeout = dataset->head.timeout = time (NULL) + db->negtimeout;
- dataset->head.ttl = db->negtimeout;
+ timeout = datahead_init_neg (&dataset->head,
+ sizeof (struct dataset) + req->key_len,
+ total, db->negtimeout);
/* This is the reply. */
memcpy (&dataset->resp, &notfound, total);
@@ -359,13 +353,10 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
/* Fill in the dataset. */
dataset = (struct dataset *) buffer;
- dataset->head.allocsize = total + req->key_len;
- dataset->head.recsize = total - offsetof (struct dataset, resp);
- dataset->head.notfound = false;
- dataset->head.nreloads = he == NULL ? 0 : (dh->nreloads + 1);
- dataset->head.usable = true;
- dataset->head.ttl = db->postimeout;
- timeout = dataset->head.timeout = time (NULL) + dataset->head.ttl;
+ timeout = datahead_init_pos (&dataset->head, total + req->key_len,
+ total - offsetof (struct dataset, resp),
+ he == NULL ? 0 : dh->nreloads + 1,
+ db->postimeout);
dataset->resp.version = NSCD_VERSION;
dataset->resp.found = 1;
@@ -541,12 +532,12 @@ addinnetgrX (struct database_dyn *db, int fd, request_header *req,
dataset = &dataset_mem;
}
- dataset->head.allocsize = sizeof (*dataset) + req->key_len;
- dataset->head.recsize = sizeof (innetgroup_response_header);
+ datahead_init_pos (&dataset->head, sizeof (*dataset) + req->key_len,
+ sizeof (innetgroup_response_header),
+ he == NULL ? 0 : dh->nreloads + 1, result->head.ttl);
+ /* Set the notfound status and timeout based on the result from
+ getnetgrent. */
dataset->head.notfound = result->head.notfound;
- dataset->head.nreloads = he == NULL ? 0 : (dh->nreloads + 1);
- dataset->head.usable = true;
- dataset->head.ttl = result->head.ttl;
dataset->head.timeout = timeout;
dataset->resp.version = NSCD_VERSION;
diff --git glibc-2.17-c758a686/nscd/nscd-client.h glibc-2.17-c758a686/nscd/nscd-client.h
index 98f77e7..ee16df6 100644
--- glibc-2.17-c758a686/nscd/nscd-client.h
+++ glibc-2.17-c758a686/nscd/nscd-client.h
@@ -236,6 +236,48 @@ struct datahead
} data[0];
};
+static inline time_t
+datahead_init_common (struct datahead *head, nscd_ssize_t allocsize,
+ nscd_ssize_t recsize, uint32_t ttl)
+{
+ /* Initialize so that we don't write out junk in uninitialized data to the
+ cache. */
+ memset (head, 0, sizeof (*head));
+
+ head->allocsize = allocsize;
+ head->recsize = recsize;
+ head->usable = true;
+
+ head->ttl = ttl;
+
+ /* Compute and return the timeout time. */
+ return head->timeout = time (NULL) + ttl;
+}
+
+static inline time_t
+datahead_init_pos (struct datahead *head, nscd_ssize_t allocsize,
+ nscd_ssize_t recsize, uint8_t nreloads, uint32_t ttl)
+{
+ time_t ret = datahead_init_common (head, allocsize, recsize, ttl);
+
+ head->notfound = false;
+ head->nreloads = nreloads;
+
+ return ret;
+}
+
+static inline time_t
+datahead_init_neg (struct datahead *head, nscd_ssize_t allocsize,
+ nscd_ssize_t recsize, uint32_t ttl)
+{
+ time_t ret = datahead_init_common (head, allocsize, recsize, ttl);
+
+ /* We don't need to touch nreloads here since it is set to our desired value
+ (0) when we clear the structure. */
+ head->notfound = true;
+
+ return ret;
+}
/* Structure for one hash table entry. */
struct hashentry
diff --git glibc-2.17-c758a686/nscd/pwdcache.c glibc-2.17-c758a686/nscd/pwdcache.c
index fa355c3..41c245b 100644
--- glibc-2.17-c758a686/nscd/pwdcache.c
+++ glibc-2.17-c758a686/nscd/pwdcache.c
@@ -135,14 +135,10 @@ cache_addpw (struct database_dyn *db, int fd, request_header *req,
else if ((dataset = mempool_alloc (db, (sizeof (struct dataset)
+ req->key_len), 1)) != NULL)
{
- dataset->head.allocsize = sizeof (struct dataset) + req->key_len;
- dataset->head.recsize = total;
- dataset->head.notfound = true;
- dataset->head.nreloads = 0;
- dataset->head.usable = true;
-
- /* Compute the timeout time. */
- timeout = dataset->head.timeout = t + db->negtimeout;
+ timeout = datahead_init_neg (&dataset->head,
+ (sizeof (struct dataset)
+ + req->key_len), total,
+ db->negtimeout);
/* This is the reply. */
memcpy (&dataset->resp, &notfound, total);
@@ -215,14 +211,10 @@ cache_addpw (struct database_dyn *db, int fd, request_header *req,
alloca_used = true;
}
- dataset->head.allocsize = total + n;
- dataset->head.recsize = total - offsetof (struct dataset, resp);
- dataset->head.notfound = false;
- dataset->head.nreloads = he == NULL ? 0 : (dh->nreloads + 1);
- dataset->head.usable = true;
-
- /* Compute the timeout time. */
- timeout = dataset->head.timeout = t + db->postimeout;
+ timeout = datahead_init_pos (&dataset->head, total + n,
+ total - offsetof (struct dataset, resp),
+ he == NULL ? 0 : dh->nreloads + 1,
+ db->postimeout);
dataset->resp.version = NSCD_VERSION;
dataset->resp.found = 1;
diff --git glibc-2.17-c758a686/nscd/servicescache.c glibc-2.17-c758a686/nscd/servicescache.c
index 12ce9b2..95bdcfe 100644
--- glibc-2.17-c758a686/nscd/servicescache.c
+++ glibc-2.17-c758a686/nscd/servicescache.c
@@ -120,14 +120,10 @@ cache_addserv (struct database_dyn *db, int fd, request_header *req,
else if ((dataset = mempool_alloc (db, (sizeof (struct dataset)
+ req->key_len), 1)) != NULL)
{
- dataset->head.allocsize = sizeof (struct dataset) + req->key_len;
- dataset->head.recsize = total;
- dataset->head.notfound = true;
- dataset->head.nreloads = 0;
- dataset->head.usable = true;
-
- /* Compute the timeout time. */
- timeout = dataset->head.timeout = t + db->negtimeout;
+ timeout = datahead_init_neg (&dataset->head,
+ (sizeof (struct dataset)
+ + req->key_len), total,
+ db->negtimeout);
/* This is the reply. */
memcpy (&dataset->resp, &notfound, total);
@@ -207,14 +203,10 @@ cache_addserv (struct database_dyn *db, int fd, request_header *req,
alloca_used = true;
}
- dataset->head.allocsize = total + req->key_len;
- dataset->head.recsize = total - offsetof (struct dataset, resp);
- dataset->head.notfound = false;
- dataset->head.nreloads = he == NULL ? 0 : (dh->nreloads + 1);
- dataset->head.usable = true;
-
- /* Compute the timeout time. */
- timeout = dataset->head.timeout = t + db->postimeout;
+ timeout = datahead_init_pos (&dataset->head, total + req->key_len,
+ total - offsetof (struct dataset, resp),
+ he == NULL ? 0 : dh->nreloads + 1,
+ db->postimeout);
dataset->resp.version = NSCD_VERSION;
dataset->resp.found = 1;