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authorChristoph Hellwig <hch@lst.de>2005-08-14 20:33:59 -0400
committerDavid S. Miller <davem@sunset.davemloft.net>2005-08-29 18:59:07 -0400
commit34b4a4a624bafe089107966a6c56d2a1aca026d4 (patch)
treed0546ea54dc1f7169447133df89e1512eb48ae39 /net
parent000efe1d86620244b8e017429e57fab4170ab05a (diff)
[NETFILTER]: Remove tasklist_lock abuse in ipt{,6}owner
Rip out cmd/sid/pid matching since its unfixable broken and stands in the way of locking changes to tasklist_lock. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/netfilter/ipt_owner.c132
-rw-r--r--net/ipv6/netfilter/ip6t_owner.c90
2 files changed, 14 insertions, 208 deletions
diff --git a/net/ipv4/netfilter/ipt_owner.c b/net/ipv4/netfilter/ipt_owner.c
index 3b9065e06381..c1889f88262b 100644
--- a/net/ipv4/netfilter/ipt_owner.c
+++ b/net/ipv4/netfilter/ipt_owner.c
@@ -21,106 +21,6 @@ MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
21MODULE_DESCRIPTION("iptables owner match"); 21MODULE_DESCRIPTION("iptables owner match");
22 22
23static int 23static int
24match_comm(const struct sk_buff *skb, const char *comm)
25{
26 struct task_struct *g, *p;
27 struct files_struct *files;
28 int i;
29
30 read_lock(&tasklist_lock);
31 do_each_thread(g, p) {
32 if(strncmp(p->comm, comm, sizeof(p->comm)))
33 continue;
34
35 task_lock(p);
36 files = p->files;
37 if(files) {
38 spin_lock(&files->file_lock);
39 for (i=0; i < files->max_fds; i++) {
40 if (fcheck_files(files, i) ==
41 skb->sk->sk_socket->file) {
42 spin_unlock(&files->file_lock);
43 task_unlock(p);
44 read_unlock(&tasklist_lock);
45 return 1;
46 }
47 }
48 spin_unlock(&files->file_lock);
49 }
50 task_unlock(p);
51 } while_each_thread(g, p);
52 read_unlock(&tasklist_lock);
53 return 0;
54}
55
56static int
57match_pid(const struct sk_buff *skb, pid_t pid)
58{
59 struct task_struct *p;
60 struct files_struct *files;
61 int i;
62
63 read_lock(&tasklist_lock);
64 p = find_task_by_pid(pid);
65 if (!p)
66 goto out;
67 task_lock(p);
68 files = p->files;
69 if(files) {
70 spin_lock(&files->file_lock);
71 for (i=0; i < files->max_fds; i++) {
72 if (fcheck_files(files, i) ==
73 skb->sk->sk_socket->file) {
74 spin_unlock(&files->file_lock);
75 task_unlock(p);
76 read_unlock(&tasklist_lock);
77 return 1;
78 }
79 }
80 spin_unlock(&files->file_lock);
81 }
82 task_unlock(p);
83out:
84 read_unlock(&tasklist_lock);
85 return 0;
86}
87
88static int
89match_sid(const struct sk_buff *skb, pid_t sid)
90{
91 struct task_struct *g, *p;
92 struct file *file = skb->sk->sk_socket->file;
93 int i, found=0;
94
95 read_lock(&tasklist_lock);
96 do_each_thread(g, p) {
97 struct files_struct *files;
98 if (p->signal->session != sid)
99 continue;
100
101 task_lock(p);
102 files = p->files;
103 if (files) {
104 spin_lock(&files->file_lock);
105 for (i=0; i < files->max_fds; i++) {
106 if (fcheck_files(files, i) == file) {
107 found = 1;
108 break;
109 }
110 }
111 spin_unlock(&files->file_lock);
112 }
113 task_unlock(p);
114 if (found)
115 goto out;
116 } while_each_thread(g, p);
117out:
118 read_unlock(&tasklist_lock);
119
120 return found;
121}
122
123static int
124match(const struct sk_buff *skb, 24match(const struct sk_buff *skb,
125 const struct net_device *in, 25 const struct net_device *in,
126 const struct net_device *out, 26 const struct net_device *out,
@@ -145,24 +45,6 @@ match(const struct sk_buff *skb,
145 return 0; 45 return 0;
146 } 46 }
147 47
148 if(info->match & IPT_OWNER_PID) {
149 if (!match_pid(skb, info->pid) ^
150 !!(info->invert & IPT_OWNER_PID))
151 return 0;
152 }
153
154 if(info->match & IPT_OWNER_SID) {
155 if (!match_sid(skb, info->sid) ^
156 !!(info->invert & IPT_OWNER_SID))
157 return 0;
158 }
159
160 if(info->match & IPT_OWNER_COMM) {
161 if (!match_comm(skb, info->comm) ^
162 !!(info->invert & IPT_OWNER_COMM))
163 return 0;
164 }
165
166 return 1; 48 return 1;
167} 49}
168 50
@@ -173,6 +55,8 @@ checkentry(const char *tablename,
173 unsigned int matchsize, 55 unsigned int matchsize,
174 unsigned int hook_mask) 56 unsigned int hook_mask)
175{ 57{
58 const struct ipt_owner_info *info = matchinfo;
59
176 if (hook_mask 60 if (hook_mask
177 & ~((1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_POST_ROUTING))) { 61 & ~((1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_POST_ROUTING))) {
178 printk("ipt_owner: only valid for LOCAL_OUT or POST_ROUTING.\n"); 62 printk("ipt_owner: only valid for LOCAL_OUT or POST_ROUTING.\n");
@@ -184,15 +68,13 @@ checkentry(const char *tablename,
184 IPT_ALIGN(sizeof(struct ipt_owner_info))); 68 IPT_ALIGN(sizeof(struct ipt_owner_info)));
185 return 0; 69 return 0;
186 } 70 }
187#ifdef CONFIG_SMP 71
188 /* files->file_lock can not be used in a BH */ 72 if (info->match & (IPT_OWNER_PID|IPT_OWNER_SID|IPT_OWNER_COMM)) {
189 if (((struct ipt_owner_info *)matchinfo)->match 73 printk("ipt_owner: pid, sid and command matching "
190 & (IPT_OWNER_PID|IPT_OWNER_SID|IPT_OWNER_COMM)) { 74 "not supported anymore\n");
191 printk("ipt_owner: pid, sid and command matching is broken "
192 "on SMP.\n");
193 return 0; 75 return 0;
194 } 76 }
195#endif 77
196 return 1; 78 return 1;
197} 79}
198 80
diff --git a/net/ipv6/netfilter/ip6t_owner.c b/net/ipv6/netfilter/ip6t_owner.c
index ab0e32d3de46..9b91decbfddb 100644
--- a/net/ipv6/netfilter/ip6t_owner.c
+++ b/net/ipv6/netfilter/ip6t_owner.c
@@ -20,71 +20,6 @@ MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
20MODULE_DESCRIPTION("IP6 tables owner matching module"); 20MODULE_DESCRIPTION("IP6 tables owner matching module");
21MODULE_LICENSE("GPL"); 21MODULE_LICENSE("GPL");
22 22
23static int
24match_pid(const struct sk_buff *skb, pid_t pid)
25{
26 struct task_struct *p;
27 struct files_struct *files;
28 int i;
29
30 read_lock(&tasklist_lock);
31 p = find_task_by_pid(pid);
32 if (!p)
33 goto out;
34 task_lock(p);
35 files = p->files;
36 if(files) {
37 spin_lock(&files->file_lock);
38 for (i=0; i < files->max_fds; i++) {
39 if (fcheck_files(files, i) == skb->sk->sk_socket->file) {
40 spin_unlock(&files->file_lock);
41 task_unlock(p);
42 read_unlock(&tasklist_lock);
43 return 1;
44 }
45 }
46 spin_unlock(&files->file_lock);
47 }
48 task_unlock(p);
49out:
50 read_unlock(&tasklist_lock);
51 return 0;
52}
53
54static int
55match_sid(const struct sk_buff *skb, pid_t sid)
56{
57 struct task_struct *g, *p;
58 struct file *file = skb->sk->sk_socket->file;
59 int i, found=0;
60
61 read_lock(&tasklist_lock);
62 do_each_thread(g, p) {
63 struct files_struct *files;
64 if (p->signal->session != sid)
65 continue;
66
67 task_lock(p);
68 files = p->files;
69 if (files) {
70 spin_lock(&files->file_lock);
71 for (i=0; i < files->max_fds; i++) {
72 if (fcheck_files(files, i) == file) {
73 found = 1;
74 break;
75 }
76 }
77 spin_unlock(&files->file_lock);
78 }
79 task_unlock(p);
80 if (found)
81 goto out;
82 } while_each_thread(g, p);
83out:
84 read_unlock(&tasklist_lock);
85
86 return found;
87}
88 23
89static int 24static int
90match(const struct sk_buff *skb, 25match(const struct sk_buff *skb,
@@ -112,18 +47,6 @@ match(const struct sk_buff *skb,
112 return 0; 47 return 0;
113 } 48 }
114 49
115 if(info->match & IP6T_OWNER_PID) {
116 if (!match_pid(skb, info->pid) ^
117 !!(info->invert & IP6T_OWNER_PID))
118 return 0;
119 }
120
121 if(info->match & IP6T_OWNER_SID) {
122 if (!match_sid(skb, info->sid) ^
123 !!(info->invert & IP6T_OWNER_SID))
124 return 0;
125 }
126
127 return 1; 50 return 1;
128} 51}
129 52
@@ -134,6 +57,8 @@ checkentry(const char *tablename,
134 unsigned int matchsize, 57 unsigned int matchsize,
135 unsigned int hook_mask) 58 unsigned int hook_mask)
136{ 59{
60 const struct ip6t_owner_info *info = matchinfo;
61
137 if (hook_mask 62 if (hook_mask
138 & ~((1 << NF_IP6_LOCAL_OUT) | (1 << NF_IP6_POST_ROUTING))) { 63 & ~((1 << NF_IP6_LOCAL_OUT) | (1 << NF_IP6_POST_ROUTING))) {
139 printk("ip6t_owner: only valid for LOCAL_OUT or POST_ROUTING.\n"); 64 printk("ip6t_owner: only valid for LOCAL_OUT or POST_ROUTING.\n");
@@ -142,14 +67,13 @@ checkentry(const char *tablename,
142 67
143 if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_owner_info))) 68 if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_owner_info)))
144 return 0; 69 return 0;
145#ifdef CONFIG_SMP 70
146 /* files->file_lock can not be used in a BH */ 71 if (info->match & (IP6T_OWNER_PID|IP6T_OWNER_SID)) {
147 if (((struct ip6t_owner_info *)matchinfo)->match 72 printk("ipt_owner: pid and sid matching "
148 & (IP6T_OWNER_PID|IP6T_OWNER_SID)) { 73 "not supported anymore\n");
149 printk("ip6t_owner: pid and sid matching is broken on SMP.\n");
150 return 0; 74 return 0;
151 } 75 }
152#endif 76
153 return 1; 77 return 1;
154} 78}
155 79
generated by cgit v1.2.2 (git 2.25.0) at 2024-09-22 21:26:19 -0400