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ocfs2: use scnprintf() for avoiding potential buffer overflow

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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@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joseph Qi <jiangqi903@gmail.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Link: http://lkml.kernel.org/r/20200311093516.25300-1-tiwai@suse.de
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Takashi Iwai 2020-04-01 21:04:05 -07:00 committed by Linus Torvalds
parent 0434c9f404
commit d293d3af2d
4 changed files with 80 additions and 80 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
fs/ocfs2/cluster/heartbeat.c
View File

@ -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);

4
fs/ocfs2/cluster/netdebug.c
View File

@ -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;
}

100
fs/ocfs2/dlm/dlmdebug.c
View File

@ -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);
}

46
fs/ocfs2/super.c
View File

@ -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 ? '*' : ' '),