forked from pool/glibc
Andreas Schwab
44414488d6
- Import patches from 2.23 branch OBS-URL: https://build.opensuse.org/request/show/394998 OBS-URL: https://build.opensuse.org/package/show/Base:System/glibc?expand=0&rev=436
78 lines
2.3 KiB
Diff
78 lines
2.3 KiB
Diff
2016-04-27 Florian Weimer <fweimer@redhat.com>
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[BZ #19830]
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* resolv/nss_dns/dns-host.c (getanswer_r): Check RDATA length.
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(gaih_getanswer_slice): Likewise.
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* resolv/nss_dns/dns-canon.c (_nss_dns_getcanonname_r): Likewise.
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Also check for availability of RR metadata.
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Index: glibc-2.23/resolv/nss_dns/dns-canon.c
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===================================================================
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--- glibc-2.23.orig/resolv/nss_dns/dns-canon.c
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+++ glibc-2.23/resolv/nss_dns/dns-canon.c
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@@ -103,6 +103,11 @@ _nss_dns_getcanonname_r (const char *nam
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ptr += s;
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+ /* Check that there are enough bytes for the RR
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+ metadata. */
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+ if (endptr - ptr < 10)
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+ goto unavail;
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+
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/* Check whether type and class match. */
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uint_fast16_t type;
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NS_GET16 (type, ptr);
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@@ -137,11 +142,16 @@ _nss_dns_getcanonname_r (const char *nam
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if (__ns_get16 (ptr) != ns_c_in)
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goto unavail;
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- /* Also skip over the TTL. */
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+ /* Also skip over class and TTL. */
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ptr += sizeof (uint16_t) + sizeof (uint32_t);
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- /* Skip over the data length and data. */
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- ptr += sizeof (uint16_t) + __ns_get16 (ptr);
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+ /* Skip over RDATA length and RDATA itself. */
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+ uint16_t rdatalen = __ns_get16 (ptr);
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+ ptr += sizeof (uint16_t);
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+ /* Not enough room for RDATA. */
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+ if (endptr - ptr < rdatalen)
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+ goto unavail;
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+ ptr += rdatalen;
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}
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}
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Index: glibc-2.23/resolv/nss_dns/dns-host.c
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===================================================================
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--- glibc-2.23.orig/resolv/nss_dns/dns-host.c
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+++ glibc-2.23/resolv/nss_dns/dns-host.c
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@@ -751,6 +751,14 @@ getanswer_r (const querybuf *answer, int
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cp += INT32SZ; /* TTL */
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n = __ns_get16 (cp);
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cp += INT16SZ; /* len */
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+
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+ if (end_of_message - cp < n)
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+ {
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+ /* RDATA extends beyond the end of the packet. */
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+ ++had_error;
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+ continue;
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+ }
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+
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if (__glibc_unlikely (class != C_IN))
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{
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/* XXX - debug? syslog? */
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@@ -1077,6 +1085,13 @@ gaih_getanswer_slice (const querybuf *an
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n = __ns_get16 (cp);
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cp += INT16SZ; /* len */
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+ if (end_of_message - cp < n)
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+ {
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+ /* RDATA extends beyond the end of the packet. */
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+ ++had_error;
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+ continue;
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+ }
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+
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if (class != C_IN)
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{
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cp += n;
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