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DivestOS/Patches/LineageOS-14.1/android_external_libexif/323459.patch
Tad 202033c013
Pull in old cherrypicks + 5 missing patches from syphyr 
This adds 3 expat patches for n-asb-2022-09
from https://github.com/syphyr/android_external_expat/commits/cm-14.1
and also applies 2 of them to 15.1

Signed-off-by: Tad <tad@spotco.us>
2022-09-11 14:02:35 -04:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jayant Chowdhary <jchowdhary@google.com>
Date: Tue, 24 Aug 2021 18:04:56 +0000
Subject: [PATCH] Fix MakerNote tag size overflow issues at read time.
This is a cherry-pick of
https://github.com/libexif/libexif/commit/435e21f05001fb03f9f186fa7cbc69454afd00d1
for CVE-2020-13112
Bug: 194342672
Test: sts-tradefed run sts-engbuild-no-spl-lock -m StsHostTestCases
--test android.security.sts.CVE_2020_13112#testPocBug_194342672
Change-Id: Ibdf388bc768213833f8fef9740b3527d46a14a2a
Merged-In: Id106e79e829329145d27a93273241b58878bfac3
Signed-off-by: Jayant Chowdhary <jchowdhary@google.com>
(cherry picked from commit fd5f7bab830858e57a2baf9d4dd47e5820337b56)
Merged-In:Ibdf388bc768213833f8fef9740b3527d46a14a2a
---
libexif/canon/exif-mnote-data-canon.c | 20 ++++++++++++++---
libexif/fuji/exif-mnote-data-fuji.c | 22 +++++++++++++-----
libexif/olympus/exif-mnote-data-olympus.c | 27 ++++++++++++++++++-----
libexif/pentax/exif-mnote-data-pentax.c | 19 ++++++++++++----
4 files changed, 69 insertions(+), 19 deletions(-)
diff --git a/libexif/canon/exif-mnote-data-canon.c b/libexif/canon/exif-mnote-data-canon.c
index acf88ab..4396c53 100644
--- a/libexif/canon/exif-mnote-data-canon.c
+++ b/libexif/canon/exif-mnote-data-canon.c
@@ -32,6 +32,8 @@
#define DEBUG
+#define CHECKOVERFLOW(offset,datasize,structsize) (( offset >= datasize) || (structsize > datasize) || (offset > datasize - structsize ))
+
static void
exif_mnote_data_canon_clear (ExifMnoteDataCanon *n)
{
@@ -209,7 +211,8 @@ exif_mnote_data_canon_load (ExifMnoteData *ne,
return;
}
datao = 6 + n->offset;
- if ((datao + 2 < datao) || (datao + 2 < 2) || (datao + 2 > buf_size)) {
+
+ if (CHECKOVERFLOW(datao, buf_size, 2)) {
exif_log (ne->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifMnoteCanon", "Short MakerNote");
return;
@@ -233,7 +236,7 @@ exif_mnote_data_canon_load (ExifMnoteData *ne,
tcount = 0;
for (i = c, o = datao; i; --i, o += 12) {
size_t s;
- if ((o + 12 < o) || (o + 12 < 12) || (o + 12 > buf_size)) {
+ if (CHECKOVERFLOW(o,buf_size,12)) {
exif_log (ne->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifMnoteCanon", "Short MakerNote");
break;
@@ -248,6 +251,16 @@ exif_mnote_data_canon_load (ExifMnoteData *ne,
"Loading entry 0x%x ('%s')...", n->entries[tcount].tag,
mnote_canon_tag_get_name (n->entries[tcount].tag));
+ /* Check if we overflow the multiplication. Use buf_size as the max size for integer overflow detection,
+ * we will check the buffer sizes closer later. */
+ if ( exif_format_get_size (n->entries[tcount].format) &&
+ buf_size / exif_format_get_size (n->entries[tcount].format) < n->entries[tcount].components
+ ) {
+ exif_log (ne->log, EXIF_LOG_CODE_CORRUPT_DATA,
+ "ExifMnoteCanon", "Tag size overflow detected (%u * %lu)", exif_format_get_size (n->entries[tcount].format), n->entries[tcount].components);
+ continue;
+ }
+
/*
* Size? If bigger than 4 bytes, the actual data is not
* in the entry but somewhere else (offset).
@@ -264,7 +277,8 @@ exif_mnote_data_canon_load (ExifMnoteData *ne,
} else {
size_t dataofs = o + 8;
if (s > 4) dataofs = exif_get_long (buf + dataofs, n->order) + 6;
- if ((dataofs + s < s) || (dataofs + s < dataofs) || (dataofs + s > buf_size)) {
+
+ if (CHECKOVERFLOW(dataofs, buf_size, s)) {
exif_log (ne->log, EXIF_LOG_CODE_DEBUG,
"ExifMnoteCanon",
"Tag data past end of buffer (%zu > %u)",
diff --git a/libexif/fuji/exif-mnote-data-fuji.c b/libexif/fuji/exif-mnote-data-fuji.c
index a9949e1..11ff8c3 100644
--- a/libexif/fuji/exif-mnote-data-fuji.c
+++ b/libexif/fuji/exif-mnote-data-fuji.c
@@ -28,6 +28,8 @@
#include "exif-mnote-data-fuji.h"
+#define CHECKOVERFLOW(offset,datasize,structsize) (( offset >= datasize) || (structsize > datasize) || (offset > datasize - structsize ))
+
struct _MNoteFujiDataPrivate {
ExifByteOrder order;
};
@@ -162,7 +164,7 @@ exif_mnote_data_fuji_load (ExifMnoteData *en,
return;
}
datao = 6 + n->offset;
- if ((datao + 12 < datao) || (datao + 12 < 12) || (datao + 12 > buf_size)) {
+ if (CHECKOVERFLOW(datao, buf_size, 12)) {
exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifMnoteDataFuji", "Short MakerNote");
return;
@@ -170,8 +172,7 @@ exif_mnote_data_fuji_load (ExifMnoteData *en,
n->order = EXIF_BYTE_ORDER_INTEL;
datao += exif_get_long (buf + datao + 8, EXIF_BYTE_ORDER_INTEL);
- if ((datao + 2 < datao) || (datao + 2 < 2) ||
- (datao + 2 > buf_size)) {
+ if (CHECKOVERFLOW(datao, buf_size, 2)) {
exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifMnoteDataFuji", "Short MakerNote");
return;
@@ -195,7 +196,7 @@ exif_mnote_data_fuji_load (ExifMnoteData *en,
tcount = 0;
for (i = c, o = datao; i; --i, o += 12) {
size_t s;
- if ((o + 12 < o) || (o + 12 < 12) || (o + 12 > buf_size)) {
+ if (CHECKOVERFLOW(o, buf_size, 12)) {
exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifMnoteDataFuji", "Short MakerNote");
break;
@@ -210,6 +211,16 @@ exif_mnote_data_fuji_load (ExifMnoteData *en,
"Loading entry 0x%x ('%s')...", n->entries[tcount].tag,
mnote_fuji_tag_get_name (n->entries[tcount].tag));
+ /* Check if we overflow the multiplication. Use buf_size as the max size for integer overflow detection,
+ * we will check the buffer sizes closer later. */
+ if ( exif_format_get_size (n->entries[tcount].format) &&
+ buf_size / exif_format_get_size (n->entries[tcount].format) < n->entries[tcount].components
+ ) {
+ exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
+ "ExifMnoteDataFuji", "Tag size overflow detected (%u * %lu)", exif_format_get_size (n->entries[tcount].format), n->entries[tcount].components);
+ continue;
+ }
+
/*
* Size? If bigger than 4 bytes, the actual data is not
* in the entry but somewhere else (offset).
@@ -221,8 +232,7 @@ exif_mnote_data_fuji_load (ExifMnoteData *en,
if (s > 4)
/* The data in this case is merely a pointer */
dataofs = exif_get_long (buf + dataofs, n->order) + 6 + n->offset;
- if ((dataofs + s < dataofs) || (dataofs + s < s) ||
- (dataofs + s >= buf_size)) {
+ if (CHECKOVERFLOW(dataofs, buf_size, s)) {
exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifMnoteDataFuji", "Tag data past end of "
"buffer (%zu >= %u)", dataofs + s, buf_size);
diff --git a/libexif/olympus/exif-mnote-data-olympus.c b/libexif/olympus/exif-mnote-data-olympus.c
index f4ccbb0..e7bf984 100644
--- a/libexif/olympus/exif-mnote-data-olympus.c
+++ b/libexif/olympus/exif-mnote-data-olympus.c
@@ -37,6 +37,8 @@
*/
/*#define EXIF_OVERCOME_SANYO_OFFSET_BUG */
+#define CHECKOVERFLOW(offset,datasize,structsize) (( offset >= datasize) || (structsize > datasize) || (offset > datasize - structsize ))
+
static enum OlympusVersion
exif_mnote_data_olympus_identify_variant (const unsigned char *buf,
unsigned int buf_size);
@@ -247,7 +249,8 @@ exif_mnote_data_olympus_load (ExifMnoteData *en,
return;
}
o2 = 6 + n->offset; /* Start of interesting data */
- if ((o2 + 10 < o2) || (o2 + 10 < 10) || (o2 + 10 > buf_size)) {
+
+ if (CHECKOVERFLOW(o2,buf_size,10)) {
exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifMnoteDataOlympus", "Short MakerNote");
return;
@@ -303,6 +306,8 @@ exif_mnote_data_olympus_load (ExifMnoteData *en,
/* Olympus S760, S770 */
datao = o2;
o2 += 8;
+
+ if (CHECKOVERFLOW(o2,buf_size,4)) return;
exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataOlympus",
"Parsing Olympus maker note v2 (0x%02x, %02x, %02x, %02x)...",
buf[o2], buf[o2 + 1], buf[o2 + 2], buf[o2 + 3]);
@@ -347,6 +352,7 @@ exif_mnote_data_olympus_load (ExifMnoteData *en,
case nikonV2:
o2 += 6;
if (o2 >= buf_size) return;
+ if (CHECKOVERFLOW(o2,buf_size,12)) return;
exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataOlympus",
"Parsing Nikon maker note v2 (0x%02x, %02x, %02x, "
"%02x, %02x, %02x, %02x, %02x)...",
@@ -406,7 +412,8 @@ exif_mnote_data_olympus_load (ExifMnoteData *en,
}
/* Sanity check the offset */
- if ((o2 + 2 < o2) || (o2 + 2 < 2) || (o2 + 2 > buf_size)) {
+
+ if (CHECKOVERFLOW(o2,buf_size,2)) {
exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifMnoteOlympus", "Short MakerNote");
return;
@@ -430,7 +437,7 @@ exif_mnote_data_olympus_load (ExifMnoteData *en,
tcount = 0;
for (i = c, o = o2; i; --i, o += 12) {
size_t s;
- if ((o + 12 < o) || (o + 12 < 12) || (o + 12 > buf_size)) {
+ if (CHECKOVERFLOW(o, buf_size, 12)) {
exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifMnoteOlympus", "Short MakerNote");
break;
@@ -451,6 +458,15 @@ exif_mnote_data_olympus_load (ExifMnoteData *en,
n->entries[tcount].components,
(int)exif_format_get_size(n->entries[tcount].format)); */
+ /* Check if we overflow the multiplication. Use buf_size as the max size for integer overflow detection,
+ * we will check the buffer sizes closer later. */
+ if (exif_format_get_size (n->entries[tcount].format) &&
+ buf_size / exif_format_get_size (n->entries[tcount].format) < n->entries[tcount].components
+ ) {
+ exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifMnoteOlympus", "Tag size overflow detected (%u * %lu)", exif_format_get_size (n->entries[tcount].format), n->entries[tcount].components);
+ continue;
+ }
+
/*
* Size? If bigger than 4 bytes, the actual data is not
* in the entry but somewhere else (offset).
@@ -469,7 +485,7 @@ exif_mnote_data_olympus_load (ExifMnoteData *en,
* tag in its MakerNote. The offset is actually the absolute
* position in the file instead of the position within the IFD.
*/
- if (dataofs + s > buf_size && n->version == sanyoV1) {
+ if (dataofs > (buf_size - s) && n->version == sanyoV1) {
/* fix pointer */
dataofs -= datao + 6;
exif_log (en->log, EXIF_LOG_CODE_DEBUG,
@@ -478,8 +494,7 @@ exif_mnote_data_olympus_load (ExifMnoteData *en,
}
#endif
}
- if ((dataofs + s < dataofs) || (dataofs + s < s) ||
- (dataofs + s > buf_size)) {
+ if (CHECKOVERFLOW(dataofs, buf_size, s)) {
exif_log (en->log, EXIF_LOG_CODE_DEBUG,
"ExifMnoteOlympus",
"Tag data past end of buffer (%zu > %u)",
diff --git a/libexif/pentax/exif-mnote-data-pentax.c b/libexif/pentax/exif-mnote-data-pentax.c
index 38fbf64..f9eb69c 100644
--- a/libexif/pentax/exif-mnote-data-pentax.c
+++ b/libexif/pentax/exif-mnote-data-pentax.c
@@ -28,6 +28,8 @@
#include <libexif/exif-byte-order.h>
#include <libexif/exif-utils.h>
+#define CHECKOVERFLOW(offset,datasize,structsize) (( offset >= datasize) || (structsize > datasize) || (offset > datasize - structsize ))
+
static void
exif_mnote_data_pentax_clear (ExifMnoteDataPentax *n)
{
@@ -224,7 +226,7 @@ exif_mnote_data_pentax_load (ExifMnoteData *en,
return;
}
datao = 6 + n->offset;
- if ((datao + 8 < datao) || (datao + 8 < 8) || (datao + 8 > buf_size)) {
+ if (CHECKOVERFLOW(datao, buf_size, 8)) {
exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifMnoteDataPentax", "Short MakerNote");
return;
@@ -277,7 +279,7 @@ exif_mnote_data_pentax_load (ExifMnoteData *en,
tcount = 0;
for (i = c, o = datao; i; --i, o += 12) {
size_t s;
- if ((o + 12 < o) || (o + 12 < 12) || (o + 12 > buf_size)) {
+ if (CHECKOVERFLOW(o,buf_size,12)) {
exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifMnoteDataPentax", "Short MakerNote");
break;
@@ -292,6 +294,16 @@ exif_mnote_data_pentax_load (ExifMnoteData *en,
"Loading entry 0x%x ('%s')...", n->entries[tcount].tag,
mnote_pentax_tag_get_name (n->entries[tcount].tag));
+ /* Check if we overflow the multiplication. Use buf_size as the max size for integer overflow detection,
+ * we will check the buffer sizes closer later. */
+ if ( exif_format_get_size (n->entries[tcount].format) &&
+ buf_size / exif_format_get_size (n->entries[tcount].format) < n->entries[tcount].components
+ ) {
+ exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
+ "ExifMnoteDataPentax", "Tag size overflow detected (%u * %lu)", exif_format_get_size (n->entries[tcount].format), n->entries[tcount].components);
+ break;
+ }
+
/*
* Size? If bigger than 4 bytes, the actual data is not
* in the entry but somewhere else (offset).
@@ -304,8 +316,7 @@ exif_mnote_data_pentax_load (ExifMnoteData *en,
if (s > 4)
/* The data in this case is merely a pointer */
dataofs = exif_get_long (buf + dataofs, n->order) + 6;
- if ((dataofs + s < dataofs) || (dataofs + s < s) ||
- (dataofs + s > buf_size)) {
+ if (CHECKOVERFLOW(dataofs, buf_size, s)) {
exif_log (en->log, EXIF_LOG_CODE_DEBUG,
"ExifMnoteDataPentax", "Tag data past end "
"of buffer (%zu > %u)", dataofs + s, buf_size);
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