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4467. [security] It was possible to trigger a assertion when rendering

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a message. [RT #43139]

(cherry picked from commit 2bd0922cf9)
This commit is contained in:
Mark Andrews 2016-09-09 11:29:48 +10:00
parent ab083050a6
commit 51bcc28543
2 changed files with 34 additions and 11 deletions
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3
CHANGES
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@ -1,3 +1,6 @@
4467. [security] It was possible to trigger a assertion when rendering
a message. [RT #43139]
4466. [bug] Interface scanning didn't work on a Windows system
without a non local IPv6 addresses. [RT #43130]

42
lib/dns/message.c
View file

@ -1722,7 +1722,7 @@ dns_message_renderbegin(dns_message_t *msg, dns_compress_t *cctx,
if (r.length < DNS_MESSAGE_HEADERLEN)
return (ISC_R_NOSPACE);
if (r.length < msg->reserved)
if (r.length - DNS_MESSAGE_HEADERLEN < msg->reserved)
return (ISC_R_NOSPACE);
/*
@ -1863,8 +1863,29 @@ norender_rdataset(const dns_rdataset_t *rdataset, unsigned int options,
return (ISC_TRUE);
}
#endif
static isc_result_t
renderset(dns_rdataset_t *rdataset, dns_name_t *owner_name,
dns_compress_t *cctx, isc_buffer_t *target,
unsigned int reserved, unsigned int options, unsigned int *countp)
{
isc_result_t result;
/*
* Shrink the space in the buffer by the reserved amount.
*/
if (target->length - target->used < reserved)
return (ISC_R_NOSPACE);
target->length -= reserved;
result = dns_rdataset_towire(rdataset, owner_name,
cctx, target, options, countp);
target->length += reserved;
return (result);
}
isc_result_t
dns_message_rendersection(dns_message_t *msg, dns_section_t sectionid,
unsigned int options)
@ -1907,6 +1928,8 @@ dns_message_rendersection(dns_message_t *msg, dns_section_t sectionid,
/*
* Shrink the space in the buffer by the reserved amount.
*/
if (msg->buffer->length - msg->buffer->used < msg->reserved)
return (ISC_R_NOSPACE);
msg->buffer->length -= msg->reserved;
total = 0;
@ -2182,9 +2205,8 @@ dns_message_renderend(dns_message_t *msg) {
* Render.
*/
count = 0;
result = dns_rdataset_towire(msg->opt, dns_rootname,
msg->cctx, msg->buffer, 0,
&count);
result = renderset(msg->opt, dns_rootname, msg->cctx,
msg->buffer, msg->reserved, 0, &count);
msg->counts[DNS_SECTION_ADDITIONAL] += count;
if (result != ISC_R_SUCCESS)
return (result);
@ -2200,9 +2222,8 @@ dns_message_renderend(dns_message_t *msg) {
if (result != ISC_R_SUCCESS)
return (result);
count = 0;
result = dns_rdataset_towire(msg->tsig, msg->tsigname,
msg->cctx, msg->buffer, 0,
&count);
result = renderset(msg->tsig, msg->tsigname, msg->cctx,
msg->buffer, msg->reserved, 0, &count);
msg->counts[DNS_SECTION_ADDITIONAL] += count;
if (result != ISC_R_SUCCESS)
return (result);
@ -2223,9 +2244,8 @@ dns_message_renderend(dns_message_t *msg) {
* the owner name of a SIG(0) is irrelevant, and will not
* be set in a message being rendered.
*/
result = dns_rdataset_towire(msg->sig0, dns_rootname,
msg->cctx, msg->buffer, 0,
&count);
result = renderset(msg->sig0, dns_rootname, msg->cctx,
msg->buffer, msg->reserved, 0, &count);
msg->counts[DNS_SECTION_ADDITIONAL] += count;
if (result != ISC_R_SUCCESS)
return (result);