Takashi Iwai
2020-Mar-11 09:35 UTC
[Ocfs2-devel] [PATCH] ocfs2: Use scnprintf() for avoiding potential buffer overflow
Since snprintf() returns the would-be-output size instead of the
actual output size, the succeeding calls may go beyond the given
buffer limit. Fix it by replacing with scnprintf().
Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
fs/ocfs2/cluster/heartbeat.c | 10 ++---
fs/ocfs2/cluster/netdebug.c | 4 +-
fs/ocfs2/dlm/dlmdebug.c | 100 +++++++++++++++++++++----------------------
fs/ocfs2/super.c | 46 ++++++++++----------
4 files changed, 80 insertions(+), 80 deletions(-)
diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index 78cb48d6a596..89d13e0705fe 100644
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -1307,7 +1307,7 @@ static int o2hb_debug_open(struct inode *inode, struct
file *file)
case O2HB_DB_TYPE_REGION_NUMBER:
reg = (struct o2hb_region *)db->db_data;
- out += snprintf(buf + out, PAGE_SIZE - out, "%d\n",
+ out += scnprintf(buf + out, PAGE_SIZE - out, "%d\n",
reg->hr_region_num);
goto done;
@@ -1317,12 +1317,12 @@ static int o2hb_debug_open(struct inode *inode, struct
file *file)
/* If 0, it has never been set before */
if (lts)
lts = jiffies_to_msecs(jiffies - lts);
- out += snprintf(buf + out, PAGE_SIZE - out, "%lu\n", lts);
+ out += scnprintf(buf + out, PAGE_SIZE - out, "%lu\n", lts);
goto done;
case O2HB_DB_TYPE_REGION_PINNED:
reg = (struct o2hb_region *)db->db_data;
- out += snprintf(buf + out, PAGE_SIZE - out, "%u\n",
+ out += scnprintf(buf + out, PAGE_SIZE - out, "%u\n",
!!reg->hr_item_pinned);
goto done;
@@ -1331,8 +1331,8 @@ static int o2hb_debug_open(struct inode *inode, struct
file *file)
}
while ((i = find_next_bit(map, db->db_len, i + 1)) < db->db_len)
- out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i);
- out += snprintf(buf + out, PAGE_SIZE - out, "\n");
+ out += scnprintf(buf + out, PAGE_SIZE - out, "%d ", i);
+ out += scnprintf(buf + out, PAGE_SIZE - out, "\n");
done:
i_size_write(inode, out);
diff --git a/fs/ocfs2/cluster/netdebug.c b/fs/ocfs2/cluster/netdebug.c
index 02bf4a1774cc..667a5c5e1f66 100644
--- a/fs/ocfs2/cluster/netdebug.c
+++ b/fs/ocfs2/cluster/netdebug.c
@@ -443,8 +443,8 @@ static int o2net_fill_bitmap(char *buf, int len)
o2net_fill_node_map(map, sizeof(map));
while ((i = find_next_bit(map, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES)
- out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i);
- out += snprintf(buf + out, PAGE_SIZE - out, "\n");
+ out += scnprintf(buf + out, PAGE_SIZE - out, "%d ", i);
+ out += scnprintf(buf + out, PAGE_SIZE - out, "\n");
return out;
}
diff --git a/fs/ocfs2/dlm/dlmdebug.c b/fs/ocfs2/dlm/dlmdebug.c
index c5c6efba7b5e..4b8b41d23e91 100644
--- a/fs/ocfs2/dlm/dlmdebug.c
+++ b/fs/ocfs2/dlm/dlmdebug.c
@@ -244,11 +244,11 @@ static int stringify_lockname(const char *lockname, int
locklen, char *buf,
memcpy((__be64 *)&inode_blkno_be,
(char *)&lockname[OCFS2_DENTRY_LOCK_INO_START],
sizeof(__be64));
- out += snprintf(buf + out, len - out, "%.*s%08x",
+ out += scnprintf(buf + out, len - out, "%.*s%08x",
OCFS2_DENTRY_LOCK_INO_START - 1, lockname,
(unsigned int)be64_to_cpu(inode_blkno_be));
} else
- out += snprintf(buf + out, len - out, "%.*s",
+ out += scnprintf(buf + out, len - out, "%.*s",
locklen, lockname);
return out;
}
@@ -260,7 +260,7 @@ static int stringify_nodemap(unsigned long *nodemap, int
maxnodes,
int i = -1;
while ((i = find_next_bit(nodemap, maxnodes, i + 1)) < maxnodes)
- out += snprintf(buf + out, len - out, "%d ", i);
+ out += scnprintf(buf + out, len - out, "%d ", i);
return out;
}
@@ -278,34 +278,34 @@ static int dump_mle(struct dlm_master_list_entry *mle,
char *buf, int len)
mle_type = "MIG";
out += stringify_lockname(mle->mname, mle->mnamelen, buf + out, len -
out);
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"\t%3s\tmas=%3u\tnew=%3u\tevt=%1d\tuse=%1d\tref=%3d\n",
mle_type, mle->master, mle->new_master,
!list_empty(&mle->hb_events),
!!mle->inuse,
kref_read(&mle->mle_refs));
- out += snprintf(buf + out, len - out, "Maybe=");
+ out += scnprintf(buf + out, len - out, "Maybe=");
out += stringify_nodemap(mle->maybe_map, O2NM_MAX_NODES,
buf + out, len - out);
- out += snprintf(buf + out, len - out, "\n");
+ out += scnprintf(buf + out, len - out, "\n");
- out += snprintf(buf + out, len - out, "Vote=");
+ out += scnprintf(buf + out, len - out, "Vote=");
out += stringify_nodemap(mle->vote_map, O2NM_MAX_NODES,
buf + out, len - out);
- out += snprintf(buf + out, len - out, "\n");
+ out += scnprintf(buf + out, len - out, "\n");
- out += snprintf(buf + out, len - out, "Response=");
+ out += scnprintf(buf + out, len - out, "Response=");
out += stringify_nodemap(mle->response_map, O2NM_MAX_NODES,
buf + out, len - out);
- out += snprintf(buf + out, len - out, "\n");
+ out += scnprintf(buf + out, len - out, "\n");
- out += snprintf(buf + out, len - out, "Node=");
+ out += scnprintf(buf + out, len - out, "Node=");
out += stringify_nodemap(mle->node_map, O2NM_MAX_NODES,
buf + out, len - out);
- out += snprintf(buf + out, len - out, "\n");
+ out += scnprintf(buf + out, len - out, "\n");
- out += snprintf(buf + out, len - out, "\n");
+ out += scnprintf(buf + out, len - out, "\n");
return out;
}
@@ -353,7 +353,7 @@ static int debug_purgelist_print(struct dlm_ctxt *dlm, char
*buf, int len)
int out = 0;
unsigned long total = 0;
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"Dumping Purgelist for Domain: %s\n", dlm->name);
spin_lock(&dlm->spinlock);
@@ -365,13 +365,13 @@ static int debug_purgelist_print(struct dlm_ctxt *dlm,
char *buf, int len)
out += stringify_lockname(res->lockname.name,
res->lockname.len,
buf + out, len - out);
- out += snprintf(buf + out, len - out, "\t%ld\n",
+ out += scnprintf(buf + out, len - out, "\t%ld\n",
(jiffies - res->last_used)/HZ);
spin_unlock(&res->spinlock);
}
spin_unlock(&dlm->spinlock);
- out += snprintf(buf + out, len - out, "Total on list: %lu\n",
total);
+ out += scnprintf(buf + out, len - out, "Total on list: %lu\n",
total);
return out;
}
@@ -410,7 +410,7 @@ static int debug_mle_print(struct dlm_ctxt *dlm, char *buf,
int len)
int i, out = 0;
unsigned long total = 0, longest = 0, bucket_count = 0;
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"Dumping MLEs for Domain: %s\n", dlm->name);
spin_lock(&dlm->master_lock);
@@ -428,7 +428,7 @@ static int debug_mle_print(struct dlm_ctxt *dlm, char *buf,
int len)
}
spin_unlock(&dlm->master_lock);
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"Total: %lu, Longest: %lu\n", total, longest);
return out;
}
@@ -467,7 +467,7 @@ static int dump_lock(struct dlm_lock *lock, int list_type,
char *buf, int len)
#define DEBUG_LOCK_VERSION 1
spin_lock(&lock->spinlock);
- out = snprintf(buf, len,
"LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d,"
+ out = scnprintf(buf, len,
"LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d,"
"%d,%d,%d,%d\n",
DEBUG_LOCK_VERSION,
list_type, lock->ml.type, lock->ml.convert_type,
@@ -491,13 +491,13 @@ static int dump_lockres(struct dlm_lock_resource *res,
char *buf, int len)
int i;
int out = 0;
- out += snprintf(buf + out, len - out, "NAME:");
+ out += scnprintf(buf + out, len - out, "NAME:");
out += stringify_lockname(res->lockname.name, res->lockname.len,
buf + out, len - out);
- out += snprintf(buf + out, len - out, "\n");
+ out += scnprintf(buf + out, len - out, "\n");
#define DEBUG_LRES_VERSION 1
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"LRES:%d,%d,%d,%ld,%d,%d,%d,%d,%d,%d,%d\n",
DEBUG_LRES_VERSION,
res->owner, res->state, res->last_used,
@@ -509,17 +509,17 @@ static int dump_lockres(struct dlm_lock_resource *res,
char *buf, int len)
kref_read(&res->refs));
/* refmap */
- out += snprintf(buf + out, len - out, "RMAP:");
+ out += scnprintf(buf + out, len - out, "RMAP:");
out += stringify_nodemap(res->refmap, O2NM_MAX_NODES,
buf + out, len - out);
- out += snprintf(buf + out, len - out, "\n");
+ out += scnprintf(buf + out, len - out, "\n");
/* lvb */
- out += snprintf(buf + out, len - out, "LVBX:");
+ out += scnprintf(buf + out, len - out, "LVBX:");
for (i = 0; i < DLM_LVB_LEN; i++)
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"%02x", (unsigned char)res->lvb[i]);
- out += snprintf(buf + out, len - out, "\n");
+ out += scnprintf(buf + out, len - out, "\n");
/* granted */
list_for_each_entry(lock, &res->granted, list)
@@ -533,7 +533,7 @@ static int dump_lockres(struct dlm_lock_resource *res, char
*buf, int len)
list_for_each_entry(lock, &res->blocked, list)
out += dump_lock(lock, 2, buf + out, len - out);
- out += snprintf(buf + out, len - out, "\n");
+ out += scnprintf(buf + out, len - out, "\n");
return out;
}
@@ -683,41 +683,41 @@ static int debug_state_print(struct dlm_ctxt *dlm, char
*buf, int len)
}
/* Domain: xxxxxxxxxx Key: 0xdfbac769 */
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"Domain: %s Key: 0x%08x Protocol: %d.%d\n",
dlm->name, dlm->key, dlm->dlm_locking_proto.pv_major,
dlm->dlm_locking_proto.pv_minor);
/* Thread Pid: xxx Node: xxx State: xxxxx */
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"Thread Pid: %d Node: %d State: %s\n",
task_pid_nr(dlm->dlm_thread_task), dlm->node_num, state);
/* Number of Joins: xxx Joining Node: xxx */
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"Number of Joins: %d Joining Node: %d\n",
dlm->num_joins, dlm->joining_node);
/* Domain Map: xx xx xx */
- out += snprintf(buf + out, len - out, "Domain Map: ");
+ out += scnprintf(buf + out, len - out, "Domain Map: ");
out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES,
buf + out, len - out);
- out += snprintf(buf + out, len - out, "\n");
+ out += scnprintf(buf + out, len - out, "\n");
/* Exit Domain Map: xx xx xx */
- out += snprintf(buf + out, len - out, "Exit Domain Map: ");
+ out += scnprintf(buf + out, len - out, "Exit Domain Map: ");
out += stringify_nodemap(dlm->exit_domain_map, O2NM_MAX_NODES,
buf + out, len - out);
- out += snprintf(buf + out, len - out, "\n");
+ out += scnprintf(buf + out, len - out, "\n");
/* Live Map: xx xx xx */
- out += snprintf(buf + out, len - out, "Live Map: ");
+ out += scnprintf(buf + out, len - out, "Live Map: ");
out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES,
buf + out, len - out);
- out += snprintf(buf + out, len - out, "\n");
+ out += scnprintf(buf + out, len - out, "\n");
/* Lock Resources: xxx (xxx) */
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"Lock Resources: %d (%d)\n",
atomic_read(&dlm->res_cur_count),
atomic_read(&dlm->res_tot_count));
@@ -729,29 +729,29 @@ static int debug_state_print(struct dlm_ctxt *dlm, char
*buf, int len)
cur_mles += atomic_read(&dlm->mle_cur_count[i]);
/* MLEs: xxx (xxx) */
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"MLEs: %d (%d)\n", cur_mles, tot_mles);
/* Blocking: xxx (xxx) */
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
" Blocking: %d (%d)\n",
atomic_read(&dlm->mle_cur_count[DLM_MLE_BLOCK]),
atomic_read(&dlm->mle_tot_count[DLM_MLE_BLOCK]));
/* Mastery: xxx (xxx) */
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
" Mastery: %d (%d)\n",
atomic_read(&dlm->mle_cur_count[DLM_MLE_MASTER]),
atomic_read(&dlm->mle_tot_count[DLM_MLE_MASTER]));
/* Migration: xxx (xxx) */
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
" Migration: %d (%d)\n",
atomic_read(&dlm->mle_cur_count[DLM_MLE_MIGRATION]),
atomic_read(&dlm->mle_tot_count[DLM_MLE_MIGRATION]));
/* Lists: Dirty=Empty Purge=InUse PendingASTs=Empty ... */
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"Lists: Dirty=%s Purge=%s PendingASTs=%s "
"PendingBASTs=%s\n",
(list_empty(&dlm->dirty_list) ? "Empty" :
"InUse"),
@@ -760,12 +760,12 @@ static int debug_state_print(struct dlm_ctxt *dlm, char
*buf, int len)
(list_empty(&dlm->pending_basts) ? "Empty" :
"InUse"));
/* Purge Count: xxx Refs: xxx */
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"Purge Count: %d Refs: %d\n", dlm->purge_count,
kref_read(&dlm->dlm_refs));
/* Dead Node: xxx */
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"Dead Node: %d\n", dlm->reco.dead_node);
/* What about DLM_RECO_STATE_FINALIZE? */
@@ -775,19 +775,19 @@ static int debug_state_print(struct dlm_ctxt *dlm, char
*buf, int len)
state = "INACTIVE";
/* Recovery Pid: xxxx Master: xxx State: xxxx */
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"Recovery Pid: %d Master: %d State: %s\n",
task_pid_nr(dlm->dlm_reco_thread_task),
dlm->reco.new_master, state);
/* Recovery Map: xx xx */
- out += snprintf(buf + out, len - out, "Recovery Map: ");
+ out += scnprintf(buf + out, len - out, "Recovery Map: ");
out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES,
buf + out, len - out);
- out += snprintf(buf + out, len - out, "\n");
+ out += scnprintf(buf + out, len - out, "\n");
/* Recovery Node State: */
- out += snprintf(buf + out, len - out, "Recovery Node State:\n");
+ out += scnprintf(buf + out, len - out, "Recovery Node State:\n");
list_for_each_entry(node, &dlm->reco.node_data, list) {
switch (node->state) {
case DLM_RECO_NODE_DATA_INIT:
@@ -815,7 +815,7 @@ static int debug_state_print(struct dlm_ctxt *dlm, char
*buf, int len)
state = "BAD";
break;
}
- out += snprintf(buf + out, len - out, "\t%u - %s\n",
+ out += scnprintf(buf + out, len - out, "\t%u - %s\n",
node->node_num, state);
}
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 05dd68ade293..ac61eeaf3837 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -220,31 +220,31 @@ static int ocfs2_osb_dump(struct ocfs2_super *osb, char
*buf, int len)
int i, out = 0;
unsigned long flags;
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"%10s => Id: %-s Uuid: %-s Gen: 0x%X Label: %-s\n",
"Device", osb->dev_str, osb->uuid_str,
osb->fs_generation, osb->vol_label);
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"%10s => State: %d Flags: 0x%lX\n", "Volume",
atomic_read(&osb->vol_state), osb->osb_flags);
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"%10s => Block: %lu Cluster: %d\n", "Sizes",
osb->sb->s_blocksize, osb->s_clustersize);
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"%10s => Compat: 0x%X Incompat: 0x%X "
"ROcompat: 0x%X\n",
"Features", osb->s_feature_compat,
osb->s_feature_incompat, osb->s_feature_ro_compat);
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"%10s => Opts: 0x%lX AtimeQuanta: %u\n", "Mount",
osb->s_mount_opt, osb->s_atime_quantum);
if (cconn) {
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"%10s => Stack: %s Name: %*s "
"Version: %d.%d\n", "Cluster",
(*osb->osb_cluster_stack == '\0' ?
@@ -255,7 +255,7 @@ static int ocfs2_osb_dump(struct ocfs2_super *osb, char
*buf, int len)
}
spin_lock_irqsave(&osb->dc_task_lock, flags);
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"%10s => Pid: %d Count: %lu WakeSeq: %lu "
"WorkSeq: %lu\n", "DownCnvt",
(osb->dc_task ? task_pid_nr(osb->dc_task) : -1),
@@ -264,32 +264,32 @@ static int ocfs2_osb_dump(struct ocfs2_super *osb, char
*buf, int len)
spin_unlock_irqrestore(&osb->dc_task_lock, flags);
spin_lock(&osb->osb_lock);
- out += snprintf(buf + out, len - out, "%10s => Pid: %d Nodes:",
+ out += scnprintf(buf + out, len - out, "%10s => Pid: %d Nodes:",
"Recovery",
(osb->recovery_thread_task ?
task_pid_nr(osb->recovery_thread_task) : -1));
if (rm->rm_used == 0)
- out += snprintf(buf + out, len - out, " None\n");
+ out += scnprintf(buf + out, len - out, " None\n");
else {
for (i = 0; i < rm->rm_used; i++)
- out += snprintf(buf + out, len - out, " %d",
+ out += scnprintf(buf + out, len - out, " %d",
rm->rm_entries[i]);
- out += snprintf(buf + out, len - out, "\n");
+ out += scnprintf(buf + out, len - out, "\n");
}
spin_unlock(&osb->osb_lock);
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"%10s => Pid: %d Interval: %lu\n", "Commit",
(osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
osb->osb_commit_interval);
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"%10s => State: %d TxnId: %lu NumTxns: %d\n",
"Journal", osb->journal->j_state,
osb->journal->j_trans_id,
atomic_read(&osb->journal->j_num_trans));
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"%10s => GlobalAllocs: %d LocalAllocs: %d "
"SubAllocs: %d LAWinMoves: %d SAExtends: %d\n",
"Stats",
@@ -299,7 +299,7 @@ static int ocfs2_osb_dump(struct ocfs2_super *osb, char
*buf, int len)
atomic_read(&osb->alloc_stats.moves),
atomic_read(&osb->alloc_stats.bg_extends));
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"%10s => State: %u Descriptor: %llu Size: %u bits "
"Default: %u bits\n",
"LocalAlloc", osb->local_alloc_state,
@@ -307,7 +307,7 @@ static int ocfs2_osb_dump(struct ocfs2_super *osb, char
*buf, int len)
osb->local_alloc_bits, osb->local_alloc_default_bits);
spin_lock(&osb->osb_lock);
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"%10s => InodeSlot: %d StolenInodes: %d, "
"MetaSlot: %d StolenMeta: %d\n", "Steal",
osb->s_inode_steal_slot,
@@ -316,20 +316,20 @@ static int ocfs2_osb_dump(struct ocfs2_super *osb, char
*buf, int len)
atomic_read(&osb->s_num_meta_stolen));
spin_unlock(&osb->osb_lock);
- out += snprintf(buf + out, len - out, "OrphanScan => ");
- out += snprintf(buf + out, len - out, "Local: %u Global: %u ",
+ out += scnprintf(buf + out, len - out, "OrphanScan => ");
+ out += scnprintf(buf + out, len - out, "Local: %u Global: %u ",
os->os_count, os->os_seqno);
- out += snprintf(buf + out, len - out, " Last Scan: ");
+ out += scnprintf(buf + out, len - out, " Last Scan: ");
if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
- out += snprintf(buf + out, len - out, "Disabled\n");
+ out += scnprintf(buf + out, len - out, "Disabled\n");
else
- out += snprintf(buf + out, len - out, "%lu seconds ago\n",
+ out += scnprintf(buf + out, len - out, "%lu seconds ago\n",
(unsigned long)(ktime_get_seconds() - os->os_scantime));
- out += snprintf(buf + out, len - out, "%10s => %3s %10s\n",
+ out += scnprintf(buf + out, len - out, "%10s => %3s %10s\n",
"Slots", "Num", "RecoGen");
for (i = 0; i < osb->max_slots; ++i) {
- out += snprintf(buf + out, len - out,
+ out += scnprintf(buf + out, len - out,
"%10s %c %3d %10d\n",
" ",
(i == osb->slot_num ? '*' : ' '),
--
2.16.4
Joseph Qi
2020-Mar-17 00:53 UTC
[Ocfs2-devel] [PATCH] ocfs2: Use scnprintf() for avoiding potential buffer overflow
On 2020/3/11 17:35, Takashi Iwai wrote:> Since snprintf() returns the would-be-output size instead of the > actual output size, the succeeding calls may go beyond the given > buffer limit. Fix it by replacing with scnprintf(). > > Signed-off-by: Takashi Iwai <tiwai at suse.de>Looks good to me. Acked-by: Joseph Qi <joseph.qi at linux.alibaba.com>> --- > fs/ocfs2/cluster/heartbeat.c | 10 ++--- > fs/ocfs2/cluster/netdebug.c | 4 +- > fs/ocfs2/dlm/dlmdebug.c | 100 +++++++++++++++++++++---------------------- > fs/ocfs2/super.c | 46 ++++++++++---------- > 4 files changed, 80 insertions(+), 80 deletions(-) > > diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c > index 78cb48d6a596..89d13e0705fe 100644 > --- a/fs/ocfs2/cluster/heartbeat.c > +++ b/fs/ocfs2/cluster/heartbeat.c > @@ -1307,7 +1307,7 @@ static int o2hb_debug_open(struct inode *inode, struct file *file) > > case O2HB_DB_TYPE_REGION_NUMBER: > reg = (struct o2hb_region *)db->db_data; > - out += snprintf(buf + out, PAGE_SIZE - out, "%d\n", > + out += scnprintf(buf + out, PAGE_SIZE - out, "%d\n", > reg->hr_region_num); > goto done; > > @@ -1317,12 +1317,12 @@ static int o2hb_debug_open(struct inode *inode, struct file *file) > /* If 0, it has never been set before */ > if (lts) > lts = jiffies_to_msecs(jiffies - lts); > - out += snprintf(buf + out, PAGE_SIZE - out, "%lu\n", lts); > + out += scnprintf(buf + out, PAGE_SIZE - out, "%lu\n", lts); > goto done; > > case O2HB_DB_TYPE_REGION_PINNED: > reg = (struct o2hb_region *)db->db_data; > - out += snprintf(buf + out, PAGE_SIZE - out, "%u\n", > + out += scnprintf(buf + out, PAGE_SIZE - out, "%u\n", > !!reg->hr_item_pinned); > goto done; > > @@ -1331,8 +1331,8 @@ static int o2hb_debug_open(struct inode *inode, struct file *file) > } > > while ((i = find_next_bit(map, db->db_len, i + 1)) < db->db_len) > - out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i); > - out += snprintf(buf + out, PAGE_SIZE - out, "\n"); > + out += scnprintf(buf + out, PAGE_SIZE - out, "%d ", i); > + out += scnprintf(buf + out, PAGE_SIZE - out, "\n"); > > done: > i_size_write(inode, out); > diff --git a/fs/ocfs2/cluster/netdebug.c b/fs/ocfs2/cluster/netdebug.c > index 02bf4a1774cc..667a5c5e1f66 100644 > --- a/fs/ocfs2/cluster/netdebug.c > +++ b/fs/ocfs2/cluster/netdebug.c > @@ -443,8 +443,8 @@ static int o2net_fill_bitmap(char *buf, int len) > o2net_fill_node_map(map, sizeof(map)); > > while ((i = find_next_bit(map, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) > - out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i); > - out += snprintf(buf + out, PAGE_SIZE - out, "\n"); > + out += scnprintf(buf + out, PAGE_SIZE - out, "%d ", i); > + out += scnprintf(buf + out, PAGE_SIZE - out, "\n"); > > return out; > } > diff --git a/fs/ocfs2/dlm/dlmdebug.c b/fs/ocfs2/dlm/dlmdebug.c > index c5c6efba7b5e..4b8b41d23e91 100644 > --- a/fs/ocfs2/dlm/dlmdebug.c > +++ b/fs/ocfs2/dlm/dlmdebug.c > @@ -244,11 +244,11 @@ static int stringify_lockname(const char *lockname, int locklen, char *buf, > memcpy((__be64 *)&inode_blkno_be, > (char *)&lockname[OCFS2_DENTRY_LOCK_INO_START], > sizeof(__be64)); > - out += snprintf(buf + out, len - out, "%.*s%08x", > + out += scnprintf(buf + out, len - out, "%.*s%08x", > OCFS2_DENTRY_LOCK_INO_START - 1, lockname, > (unsigned int)be64_to_cpu(inode_blkno_be)); > } else > - out += snprintf(buf + out, len - out, "%.*s", > + out += scnprintf(buf + out, len - out, "%.*s", > locklen, lockname); > return out; > } > @@ -260,7 +260,7 @@ static int stringify_nodemap(unsigned long *nodemap, int maxnodes, > int i = -1; > > while ((i = find_next_bit(nodemap, maxnodes, i + 1)) < maxnodes) > - out += snprintf(buf + out, len - out, "%d ", i); > + out += scnprintf(buf + out, len - out, "%d ", i); > > return out; > } > @@ -278,34 +278,34 @@ static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len) > mle_type = "MIG"; > > out += stringify_lockname(mle->mname, mle->mnamelen, buf + out, len - out); > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "\t%3s\tmas=%3u\tnew=%3u\tevt=%1d\tuse=%1d\tref=%3d\n", > mle_type, mle->master, mle->new_master, > !list_empty(&mle->hb_events), > !!mle->inuse, > kref_read(&mle->mle_refs)); > > - out += snprintf(buf + out, len - out, "Maybe="); > + out += scnprintf(buf + out, len - out, "Maybe="); > out += stringify_nodemap(mle->maybe_map, O2NM_MAX_NODES, > buf + out, len - out); > - out += snprintf(buf + out, len - out, "\n"); > + out += scnprintf(buf + out, len - out, "\n"); > > - out += snprintf(buf + out, len - out, "Vote="); > + out += scnprintf(buf + out, len - out, "Vote="); > out += stringify_nodemap(mle->vote_map, O2NM_MAX_NODES, > buf + out, len - out); > - out += snprintf(buf + out, len - out, "\n"); > + out += scnprintf(buf + out, len - out, "\n"); > > - out += snprintf(buf + out, len - out, "Response="); > + out += scnprintf(buf + out, len - out, "Response="); > out += stringify_nodemap(mle->response_map, O2NM_MAX_NODES, > buf + out, len - out); > - out += snprintf(buf + out, len - out, "\n"); > + out += scnprintf(buf + out, len - out, "\n"); > > - out += snprintf(buf + out, len - out, "Node="); > + out += scnprintf(buf + out, len - out, "Node="); > out += stringify_nodemap(mle->node_map, O2NM_MAX_NODES, > buf + out, len - out); > - out += snprintf(buf + out, len - out, "\n"); > + out += scnprintf(buf + out, len - out, "\n"); > > - out += snprintf(buf + out, len - out, "\n"); > + out += scnprintf(buf + out, len - out, "\n"); > > return out; > } > @@ -353,7 +353,7 @@ static int debug_purgelist_print(struct dlm_ctxt *dlm, char *buf, int len) > int out = 0; > unsigned long total = 0; > > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "Dumping Purgelist for Domain: %s\n", dlm->name); > > spin_lock(&dlm->spinlock); > @@ -365,13 +365,13 @@ static int debug_purgelist_print(struct dlm_ctxt *dlm, char *buf, int len) > out += stringify_lockname(res->lockname.name, > res->lockname.len, > buf + out, len - out); > - out += snprintf(buf + out, len - out, "\t%ld\n", > + out += scnprintf(buf + out, len - out, "\t%ld\n", > (jiffies - res->last_used)/HZ); > spin_unlock(&res->spinlock); > } > spin_unlock(&dlm->spinlock); > > - out += snprintf(buf + out, len - out, "Total on list: %lu\n", total); > + out += scnprintf(buf + out, len - out, "Total on list: %lu\n", total); > > return out; > } > @@ -410,7 +410,7 @@ static int debug_mle_print(struct dlm_ctxt *dlm, char *buf, int len) > int i, out = 0; > unsigned long total = 0, longest = 0, bucket_count = 0; > > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "Dumping MLEs for Domain: %s\n", dlm->name); > > spin_lock(&dlm->master_lock); > @@ -428,7 +428,7 @@ static int debug_mle_print(struct dlm_ctxt *dlm, char *buf, int len) > } > spin_unlock(&dlm->master_lock); > > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "Total: %lu, Longest: %lu\n", total, longest); > return out; > } > @@ -467,7 +467,7 @@ static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len) > > #define DEBUG_LOCK_VERSION 1 > spin_lock(&lock->spinlock); > - out = snprintf(buf, len, "LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d," > + out = scnprintf(buf, len, "LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d," > "%d,%d,%d,%d\n", > DEBUG_LOCK_VERSION, > list_type, lock->ml.type, lock->ml.convert_type, > @@ -491,13 +491,13 @@ static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len) > int i; > int out = 0; > > - out += snprintf(buf + out, len - out, "NAME:"); > + out += scnprintf(buf + out, len - out, "NAME:"); > out += stringify_lockname(res->lockname.name, res->lockname.len, > buf + out, len - out); > - out += snprintf(buf + out, len - out, "\n"); > + out += scnprintf(buf + out, len - out, "\n"); > > #define DEBUG_LRES_VERSION 1 > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "LRES:%d,%d,%d,%ld,%d,%d,%d,%d,%d,%d,%d\n", > DEBUG_LRES_VERSION, > res->owner, res->state, res->last_used, > @@ -509,17 +509,17 @@ static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len) > kref_read(&res->refs)); > > /* refmap */ > - out += snprintf(buf + out, len - out, "RMAP:"); > + out += scnprintf(buf + out, len - out, "RMAP:"); > out += stringify_nodemap(res->refmap, O2NM_MAX_NODES, > buf + out, len - out); > - out += snprintf(buf + out, len - out, "\n"); > + out += scnprintf(buf + out, len - out, "\n"); > > /* lvb */ > - out += snprintf(buf + out, len - out, "LVBX:"); > + out += scnprintf(buf + out, len - out, "LVBX:"); > for (i = 0; i < DLM_LVB_LEN; i++) > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "%02x", (unsigned char)res->lvb[i]); > - out += snprintf(buf + out, len - out, "\n"); > + out += scnprintf(buf + out, len - out, "\n"); > > /* granted */ > list_for_each_entry(lock, &res->granted, list) > @@ -533,7 +533,7 @@ static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len) > list_for_each_entry(lock, &res->blocked, list) > out += dump_lock(lock, 2, buf + out, len - out); > > - out += snprintf(buf + out, len - out, "\n"); > + out += scnprintf(buf + out, len - out, "\n"); > > return out; > } > @@ -683,41 +683,41 @@ static int debug_state_print(struct dlm_ctxt *dlm, char *buf, int len) > } > > /* Domain: xxxxxxxxxx Key: 0xdfbac769 */ > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "Domain: %s Key: 0x%08x Protocol: %d.%d\n", > dlm->name, dlm->key, dlm->dlm_locking_proto.pv_major, > dlm->dlm_locking_proto.pv_minor); > > /* Thread Pid: xxx Node: xxx State: xxxxx */ > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "Thread Pid: %d Node: %d State: %s\n", > task_pid_nr(dlm->dlm_thread_task), dlm->node_num, state); > > /* Number of Joins: xxx Joining Node: xxx */ > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "Number of Joins: %d Joining Node: %d\n", > dlm->num_joins, dlm->joining_node); > > /* Domain Map: xx xx xx */ > - out += snprintf(buf + out, len - out, "Domain Map: "); > + out += scnprintf(buf + out, len - out, "Domain Map: "); > out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES, > buf + out, len - out); > - out += snprintf(buf + out, len - out, "\n"); > + out += scnprintf(buf + out, len - out, "\n"); > > /* Exit Domain Map: xx xx xx */ > - out += snprintf(buf + out, len - out, "Exit Domain Map: "); > + out += scnprintf(buf + out, len - out, "Exit Domain Map: "); > out += stringify_nodemap(dlm->exit_domain_map, O2NM_MAX_NODES, > buf + out, len - out); > - out += snprintf(buf + out, len - out, "\n"); > + out += scnprintf(buf + out, len - out, "\n"); > > /* Live Map: xx xx xx */ > - out += snprintf(buf + out, len - out, "Live Map: "); > + out += scnprintf(buf + out, len - out, "Live Map: "); > out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES, > buf + out, len - out); > - out += snprintf(buf + out, len - out, "\n"); > + out += scnprintf(buf + out, len - out, "\n"); > > /* Lock Resources: xxx (xxx) */ > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "Lock Resources: %d (%d)\n", > atomic_read(&dlm->res_cur_count), > atomic_read(&dlm->res_tot_count)); > @@ -729,29 +729,29 @@ static int debug_state_print(struct dlm_ctxt *dlm, char *buf, int len) > cur_mles += atomic_read(&dlm->mle_cur_count[i]); > > /* MLEs: xxx (xxx) */ > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "MLEs: %d (%d)\n", cur_mles, tot_mles); > > /* Blocking: xxx (xxx) */ > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > " Blocking: %d (%d)\n", > atomic_read(&dlm->mle_cur_count[DLM_MLE_BLOCK]), > atomic_read(&dlm->mle_tot_count[DLM_MLE_BLOCK])); > > /* Mastery: xxx (xxx) */ > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > " Mastery: %d (%d)\n", > atomic_read(&dlm->mle_cur_count[DLM_MLE_MASTER]), > atomic_read(&dlm->mle_tot_count[DLM_MLE_MASTER])); > > /* Migration: xxx (xxx) */ > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > " Migration: %d (%d)\n", > atomic_read(&dlm->mle_cur_count[DLM_MLE_MIGRATION]), > atomic_read(&dlm->mle_tot_count[DLM_MLE_MIGRATION])); > > /* Lists: Dirty=Empty Purge=InUse PendingASTs=Empty ... */ > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "Lists: Dirty=%s Purge=%s PendingASTs=%s " > "PendingBASTs=%s\n", > (list_empty(&dlm->dirty_list) ? "Empty" : "InUse"), > @@ -760,12 +760,12 @@ static int debug_state_print(struct dlm_ctxt *dlm, char *buf, int len) > (list_empty(&dlm->pending_basts) ? "Empty" : "InUse")); > > /* Purge Count: xxx Refs: xxx */ > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "Purge Count: %d Refs: %d\n", dlm->purge_count, > kref_read(&dlm->dlm_refs)); > > /* Dead Node: xxx */ > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "Dead Node: %d\n", dlm->reco.dead_node); > > /* What about DLM_RECO_STATE_FINALIZE? */ > @@ -775,19 +775,19 @@ static int debug_state_print(struct dlm_ctxt *dlm, char *buf, int len) > state = "INACTIVE"; > > /* Recovery Pid: xxxx Master: xxx State: xxxx */ > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "Recovery Pid: %d Master: %d State: %s\n", > task_pid_nr(dlm->dlm_reco_thread_task), > dlm->reco.new_master, state); > > /* Recovery Map: xx xx */ > - out += snprintf(buf + out, len - out, "Recovery Map: "); > + out += scnprintf(buf + out, len - out, "Recovery Map: "); > out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES, > buf + out, len - out); > - out += snprintf(buf + out, len - out, "\n"); > + out += scnprintf(buf + out, len - out, "\n"); > > /* Recovery Node State: */ > - out += snprintf(buf + out, len - out, "Recovery Node State:\n"); > + out += scnprintf(buf + out, len - out, "Recovery Node State:\n"); > list_for_each_entry(node, &dlm->reco.node_data, list) { > switch (node->state) { > case DLM_RECO_NODE_DATA_INIT: > @@ -815,7 +815,7 @@ static int debug_state_print(struct dlm_ctxt *dlm, char *buf, int len) > state = "BAD"; > break; > } > - out += snprintf(buf + out, len - out, "\t%u - %s\n", > + out += scnprintf(buf + out, len - out, "\t%u - %s\n", > node->node_num, state); > } > > diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c > index 05dd68ade293..ac61eeaf3837 100644 > --- a/fs/ocfs2/super.c > +++ b/fs/ocfs2/super.c > @@ -220,31 +220,31 @@ static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len) > int i, out = 0; > unsigned long flags; > > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "%10s => Id: %-s Uuid: %-s Gen: 0x%X Label: %-s\n", > "Device", osb->dev_str, osb->uuid_str, > osb->fs_generation, osb->vol_label); > > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "%10s => State: %d Flags: 0x%lX\n", "Volume", > atomic_read(&osb->vol_state), osb->osb_flags); > > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "%10s => Block: %lu Cluster: %d\n", "Sizes", > osb->sb->s_blocksize, osb->s_clustersize); > > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "%10s => Compat: 0x%X Incompat: 0x%X " > "ROcompat: 0x%X\n", > "Features", osb->s_feature_compat, > osb->s_feature_incompat, osb->s_feature_ro_compat); > > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "%10s => Opts: 0x%lX AtimeQuanta: %u\n", "Mount", > osb->s_mount_opt, osb->s_atime_quantum); > > if (cconn) { > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "%10s => Stack: %s Name: %*s " > "Version: %d.%d\n", "Cluster", > (*osb->osb_cluster_stack == '\0' ? > @@ -255,7 +255,7 @@ static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len) > } > > spin_lock_irqsave(&osb->dc_task_lock, flags); > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "%10s => Pid: %d Count: %lu WakeSeq: %lu " > "WorkSeq: %lu\n", "DownCnvt", > (osb->dc_task ? task_pid_nr(osb->dc_task) : -1), > @@ -264,32 +264,32 @@ static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len) > spin_unlock_irqrestore(&osb->dc_task_lock, flags); > > spin_lock(&osb->osb_lock); > - out += snprintf(buf + out, len - out, "%10s => Pid: %d Nodes:", > + out += scnprintf(buf + out, len - out, "%10s => Pid: %d Nodes:", > "Recovery", > (osb->recovery_thread_task ? > task_pid_nr(osb->recovery_thread_task) : -1)); > if (rm->rm_used == 0) > - out += snprintf(buf + out, len - out, " None\n"); > + out += scnprintf(buf + out, len - out, " None\n"); > else { > for (i = 0; i < rm->rm_used; i++) > - out += snprintf(buf + out, len - out, " %d", > + out += scnprintf(buf + out, len - out, " %d", > rm->rm_entries[i]); > - out += snprintf(buf + out, len - out, "\n"); > + out += scnprintf(buf + out, len - out, "\n"); > } > spin_unlock(&osb->osb_lock); > > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "%10s => Pid: %d Interval: %lu\n", "Commit", > (osb->commit_task ? task_pid_nr(osb->commit_task) : -1), > osb->osb_commit_interval); > > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "%10s => State: %d TxnId: %lu NumTxns: %d\n", > "Journal", osb->journal->j_state, > osb->journal->j_trans_id, > atomic_read(&osb->journal->j_num_trans)); > > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "%10s => GlobalAllocs: %d LocalAllocs: %d " > "SubAllocs: %d LAWinMoves: %d SAExtends: %d\n", > "Stats", > @@ -299,7 +299,7 @@ static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len) > atomic_read(&osb->alloc_stats.moves), > atomic_read(&osb->alloc_stats.bg_extends)); > > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "%10s => State: %u Descriptor: %llu Size: %u bits " > "Default: %u bits\n", > "LocalAlloc", osb->local_alloc_state, > @@ -307,7 +307,7 @@ static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len) > osb->local_alloc_bits, osb->local_alloc_default_bits); > > spin_lock(&osb->osb_lock); > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "%10s => InodeSlot: %d StolenInodes: %d, " > "MetaSlot: %d StolenMeta: %d\n", "Steal", > osb->s_inode_steal_slot, > @@ -316,20 +316,20 @@ static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len) > atomic_read(&osb->s_num_meta_stolen)); > spin_unlock(&osb->osb_lock); > > - out += snprintf(buf + out, len - out, "OrphanScan => "); > - out += snprintf(buf + out, len - out, "Local: %u Global: %u ", > + out += scnprintf(buf + out, len - out, "OrphanScan => "); > + out += scnprintf(buf + out, len - out, "Local: %u Global: %u ", > os->os_count, os->os_seqno); > - out += snprintf(buf + out, len - out, " Last Scan: "); > + out += scnprintf(buf + out, len - out, " Last Scan: "); > if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE) > - out += snprintf(buf + out, len - out, "Disabled\n"); > + out += scnprintf(buf + out, len - out, "Disabled\n"); > else > - out += snprintf(buf + out, len - out, "%lu seconds ago\n", > + out += scnprintf(buf + out, len - out, "%lu seconds ago\n", > (unsigned long)(ktime_get_seconds() - os->os_scantime)); > > - out += snprintf(buf + out, len - out, "%10s => %3s %10s\n", > + out += scnprintf(buf + out, len - out, "%10s => %3s %10s\n", > "Slots", "Num", "RecoGen"); > for (i = 0; i < osb->max_slots; ++i) { > - out += snprintf(buf + out, len - out, > + out += scnprintf(buf + out, len - out, > "%10s %c %3d %10d\n", > " ", > (i == osb->slot_num ? '*' : ' '), >