Mercurial > hg > nginx
annotate src/os/unix/ngx_udp_sendmsg_chain.c @ 7048:80224192163c
Resolver: fixed possible use-after-free while resolving SRV.
Resolving an SRV record includes resolving its host names in subrequests.
Previously, if memory allocation failed while reporting a subrequest result
after receiving a response from a DNS server, the SRV resolve handler was
called immediately with the NGX_ERROR state. However, if the SRV record
included another copy of the resolved name, it was reported once again.
This could trigger the use-after-free memory access after SRV resolve
handler freed the resolve context by calling ngx_resolve_name_done().
Now the SRV resolve handler is called only when all its subrequests are
completed.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Tue, 04 Jul 2017 18:07:29 +0300 |
parents | 8ce1a34f160b |
children | d127837c714f |
rev | line source |
---|---|
6692 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 * Copyright (C) Nginx, Inc. | |
5 */ | |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 #include <ngx_event.h> | |
11 | |
12 | |
13 static ngx_chain_t *ngx_udp_output_chain_to_iovec(ngx_iovec_t *vec, | |
14 ngx_chain_t *in, ngx_log_t *log); | |
15 static ssize_t ngx_sendmsg(ngx_connection_t *c, ngx_iovec_t *vec); | |
16 | |
17 | |
18 ngx_chain_t * | |
19 ngx_udp_unix_sendmsg_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit) | |
20 { | |
21 ssize_t n; | |
22 off_t send; | |
23 ngx_chain_t *cl; | |
24 ngx_event_t *wev; | |
25 ngx_iovec_t vec; | |
26 struct iovec iovs[NGX_IOVS_PREALLOCATE]; | |
27 | |
28 wev = c->write; | |
29 | |
30 if (!wev->ready) { | |
31 return in; | |
32 } | |
33 | |
34 #if (NGX_HAVE_KQUEUE) | |
35 | |
36 if ((ngx_event_flags & NGX_USE_KQUEUE_EVENT) && wev->pending_eof) { | |
37 (void) ngx_connection_error(c, wev->kq_errno, | |
38 "kevent() reported about an closed connection"); | |
39 wev->error = 1; | |
40 return NGX_CHAIN_ERROR; | |
41 } | |
42 | |
43 #endif | |
44 | |
45 /* the maximum limit size is the maximum size_t value - the page size */ | |
46 | |
47 if (limit == 0 || limit > (off_t) (NGX_MAX_SIZE_T_VALUE - ngx_pagesize)) { | |
48 limit = NGX_MAX_SIZE_T_VALUE - ngx_pagesize; | |
49 } | |
50 | |
51 send = 0; | |
52 | |
53 vec.iovs = iovs; | |
54 vec.nalloc = NGX_IOVS_PREALLOCATE; | |
55 | |
56 for ( ;; ) { | |
57 | |
58 /* create the iovec and coalesce the neighbouring bufs */ | |
59 | |
60 cl = ngx_udp_output_chain_to_iovec(&vec, in, c->log); | |
61 | |
62 if (cl == NGX_CHAIN_ERROR) { | |
63 return NGX_CHAIN_ERROR; | |
64 } | |
65 | |
66 if (cl && cl->buf->in_file) { | |
67 ngx_log_error(NGX_LOG_ALERT, c->log, 0, | |
68 "file buf in sendmsg " | |
69 "t:%d r:%d f:%d %p %p-%p %p %O-%O", | |
70 cl->buf->temporary, | |
71 cl->buf->recycled, | |
72 cl->buf->in_file, | |
73 cl->buf->start, | |
74 cl->buf->pos, | |
75 cl->buf->last, | |
76 cl->buf->file, | |
77 cl->buf->file_pos, | |
78 cl->buf->file_last); | |
79 | |
80 ngx_debug_point(); | |
81 | |
82 return NGX_CHAIN_ERROR; | |
83 } | |
84 | |
85 if (cl == in) { | |
86 return in; | |
87 } | |
88 | |
89 send += vec.size; | |
90 | |
91 n = ngx_sendmsg(c, &vec); | |
92 | |
93 if (n == NGX_ERROR) { | |
94 return NGX_CHAIN_ERROR; | |
95 } | |
96 | |
97 if (n == NGX_AGAIN) { | |
98 wev->ready = 0; | |
99 return in; | |
100 } | |
101 | |
102 c->sent += n; | |
103 | |
104 in = ngx_chain_update_sent(in, n); | |
105 | |
106 if (send >= limit || in == NULL) { | |
107 return in; | |
108 } | |
109 } | |
110 } | |
111 | |
112 | |
113 static ngx_chain_t * | |
114 ngx_udp_output_chain_to_iovec(ngx_iovec_t *vec, ngx_chain_t *in, ngx_log_t *log) | |
115 { | |
116 size_t total, size; | |
117 u_char *prev; | |
118 ngx_uint_t n, flush; | |
119 ngx_chain_t *cl; | |
120 struct iovec *iov; | |
121 | |
122 cl = in; | |
123 iov = NULL; | |
124 prev = NULL; | |
125 total = 0; | |
126 n = 0; | |
127 flush = 0; | |
128 | |
129 for ( /* void */ ; in && !flush; in = in->next) { | |
130 | |
131 if (in->buf->flush || in->buf->last_buf) { | |
132 flush = 1; | |
133 } | |
134 | |
135 if (ngx_buf_special(in->buf)) { | |
136 continue; | |
137 } | |
138 | |
139 if (in->buf->in_file) { | |
140 break; | |
141 } | |
142 | |
143 if (!ngx_buf_in_memory(in->buf)) { | |
144 ngx_log_error(NGX_LOG_ALERT, log, 0, | |
145 "bad buf in output chain " | |
146 "t:%d r:%d f:%d %p %p-%p %p %O-%O", | |
147 in->buf->temporary, | |
148 in->buf->recycled, | |
149 in->buf->in_file, | |
150 in->buf->start, | |
151 in->buf->pos, | |
152 in->buf->last, | |
153 in->buf->file, | |
154 in->buf->file_pos, | |
155 in->buf->file_last); | |
156 | |
157 ngx_debug_point(); | |
158 | |
159 return NGX_CHAIN_ERROR; | |
160 } | |
161 | |
162 size = in->buf->last - in->buf->pos; | |
163 | |
164 if (prev == in->buf->pos) { | |
165 iov->iov_len += size; | |
166 | |
167 } else { | |
168 if (n == vec->nalloc) { | |
169 ngx_log_error(NGX_LOG_ALERT, log, 0, | |
170 "too many parts in a datagram"); | |
171 return NGX_CHAIN_ERROR; | |
172 } | |
173 | |
174 iov = &vec->iovs[n++]; | |
175 | |
176 iov->iov_base = (void *) in->buf->pos; | |
177 iov->iov_len = size; | |
178 } | |
179 | |
180 prev = in->buf->pos + size; | |
181 total += size; | |
182 } | |
183 | |
184 if (!flush) { | |
185 #if (NGX_SUPPRESS_WARN) | |
186 vec->size = 0; | |
187 vec->count = 0; | |
188 #endif | |
189 return cl; | |
190 } | |
191 | |
192 vec->count = n; | |
193 vec->size = total; | |
194 | |
195 return in; | |
196 } | |
197 | |
198 | |
199 static ssize_t | |
200 ngx_sendmsg(ngx_connection_t *c, ngx_iovec_t *vec) | |
201 { | |
202 ssize_t n; | |
203 ngx_err_t err; | |
204 struct msghdr msg; | |
205 | |
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206 #if (NGX_HAVE_MSGHDR_MSG_CONTROL) |
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207 |
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208 #if (NGX_HAVE_IP_SENDSRCADDR) |
7019 | 209 u_char msg_control[CMSG_SPACE(sizeof(struct in_addr))]; |
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210 #elif (NGX_HAVE_IP_PKTINFO) |
7019 | 211 u_char msg_control[CMSG_SPACE(sizeof(struct in_pktinfo))]; |
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212 #endif |
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213 |
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214 #if (NGX_HAVE_INET6 && NGX_HAVE_IPV6_RECVPKTINFO) |
7019 | 215 u_char msg_control6[CMSG_SPACE(sizeof(struct in6_pktinfo))]; |
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216 #endif |
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217 |
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218 #endif |
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219 |
6692 | 220 ngx_memzero(&msg, sizeof(struct msghdr)); |
221 | |
222 if (c->socklen) { | |
223 msg.msg_name = c->sockaddr; | |
224 msg.msg_namelen = c->socklen; | |
225 } | |
226 | |
227 msg.msg_iov = vec->iovs; | |
228 msg.msg_iovlen = vec->count; | |
229 | |
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230 #if (NGX_HAVE_MSGHDR_MSG_CONTROL) |
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231 |
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232 if (c->listening && c->listening->wildcard && c->local_sockaddr) { |
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233 |
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234 #if (NGX_HAVE_IP_SENDSRCADDR) |
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235 |
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236 if (c->local_sockaddr->sa_family == AF_INET) { |
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237 struct cmsghdr *cmsg; |
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238 struct in_addr *addr; |
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239 struct sockaddr_in *sin; |
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240 |
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241 msg.msg_control = &msg_control; |
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242 msg.msg_controllen = sizeof(msg_control); |
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243 |
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244 cmsg = CMSG_FIRSTHDR(&msg); |
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245 cmsg->cmsg_level = IPPROTO_IP; |
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246 cmsg->cmsg_type = IP_SENDSRCADDR; |
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247 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_addr)); |
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248 |
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249 sin = (struct sockaddr_in *) c->local_sockaddr; |
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250 |
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251 addr = (struct in_addr *) CMSG_DATA(cmsg); |
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252 *addr = sin->sin_addr; |
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253 } |
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254 |
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255 #elif (NGX_HAVE_IP_PKTINFO) |
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256 |
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257 if (c->local_sockaddr->sa_family == AF_INET) { |
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258 struct cmsghdr *cmsg; |
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259 struct in_pktinfo *pkt; |
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260 struct sockaddr_in *sin; |
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261 |
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262 msg.msg_control = &msg_control; |
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263 msg.msg_controllen = sizeof(msg_control); |
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264 |
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265 cmsg = CMSG_FIRSTHDR(&msg); |
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266 cmsg->cmsg_level = IPPROTO_IP; |
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267 cmsg->cmsg_type = IP_PKTINFO; |
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268 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); |
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269 |
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270 sin = (struct sockaddr_in *) c->local_sockaddr; |
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271 |
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272 pkt = (struct in_pktinfo *) CMSG_DATA(cmsg); |
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273 ngx_memzero(pkt, sizeof(struct in_pktinfo)); |
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274 pkt->ipi_spec_dst = sin->sin_addr; |
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275 } |
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276 |
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277 #endif |
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278 |
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279 #if (NGX_HAVE_INET6 && NGX_HAVE_IPV6_RECVPKTINFO) |
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280 |
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281 if (c->local_sockaddr->sa_family == AF_INET6) { |
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282 struct cmsghdr *cmsg; |
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283 struct in6_pktinfo *pkt6; |
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284 struct sockaddr_in6 *sin6; |
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285 |
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286 msg.msg_control = &msg_control6; |
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287 msg.msg_controllen = sizeof(msg_control6); |
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288 |
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289 cmsg = CMSG_FIRSTHDR(&msg); |
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290 cmsg->cmsg_level = IPPROTO_IPV6; |
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291 cmsg->cmsg_type = IPV6_PKTINFO; |
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292 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); |
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293 |
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294 sin6 = (struct sockaddr_in6 *) c->local_sockaddr; |
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295 |
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296 pkt6 = (struct in6_pktinfo *) CMSG_DATA(cmsg); |
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297 ngx_memzero(pkt6, sizeof(struct in6_pktinfo)); |
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298 pkt6->ipi6_addr = sin6->sin6_addr; |
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299 } |
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300 |
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301 #endif |
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302 } |
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303 |
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304 #endif |
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305 |
6692 | 306 eintr: |
307 | |
308 n = sendmsg(c->fd, &msg, 0); | |
309 | |
310 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, | |
311 "sendmsg: %z of %uz", n, vec->size); | |
312 | |
313 if (n == -1) { | |
314 err = ngx_errno; | |
315 | |
316 switch (err) { | |
317 case NGX_EAGAIN: | |
318 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, | |
319 "sendmsg() not ready"); | |
320 return NGX_AGAIN; | |
321 | |
322 case NGX_EINTR: | |
323 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, | |
324 "sendmsg() was interrupted"); | |
325 goto eintr; | |
326 | |
327 default: | |
328 c->write->error = 1; | |
329 ngx_connection_error(c, err, "sendmsg() failed"); | |
330 return NGX_ERROR; | |
331 } | |
332 } | |
333 | |
334 return n; | |
335 } |