Handle invalid windowBits in init functions#1293
Merged
Dead2 merged 1 commit intozlib-ng:developfrom Jun 16, 2022
stoeckmann:window
Merged
Handle invalid windowBits in init functions#1293Dead2 merged 1 commit intozlib-ng:developfrom stoeckmann:window
Dead2 merged 1 commit intozlib-ng:developfrom
stoeckmann:window
Conversation
Negative windowBits arguments are eventually turned positive in
deflateInit2_ and inflateInit2_ (more precisely in inflateReset2).
Such values are used to indicate that raw deflate/inflate should
be performed.
If a user supplies INT32_MIN for windowBits, the code will perform
-INT32_MIN which does not fit into int32_t. In fact, this is
undefined behavior in C and should be avoided.
Clearly this is a user error, but given the careful validation of
input arguments a few lines later in deflateInit2_ I think this
might be of interest.
Proof of Concept:
- Compile zlib-ng with gcc -ftrapv or -fsanitize=undefined
- Compile and run this program:
```
#include <limits.h>
#include <stdio.h>
#include <zlib-ng.h>
int main(void) {
zng_stream de_stream = { 0 }, in_stream = { 0 };
int result;
result = zng_deflateInit2(&de_stream, 0, Z_DEFLATED, INT32_MIN,
MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY);
printf("zng_deflateInit2: %d\n", result);
result = zng_inflateInit2(&in_stream, INT32_MIN);
printf("zng_inflateInit2: %d\n", result);
return 0;
}
```
Member
|
It looks good to me, but need @Dead2 to allow workflow approval. |
Codecov Report
@@ Coverage Diff @@
## develop #1293 +/- ##
===========================================
- Coverage 86.59% 86.57% -0.03%
===========================================
Files 124 124
Lines 10533 10537 +4
Branches 2622 2624 +2
===========================================
+ Hits 9121 9122 +1
- Misses 1056 1059 +3
Partials 356 356
Flags with carried forward coverage won't be shown. Click here to find out more.
Continue to review full report at Codecov.
|
Dead2
approved these changes
Jun 14, 2022
Merged
Dead2
added a commit
that referenced
this pull request
Mar 7, 2023
Changes since 2.0.6: - Fix CVE-2022-37434 #1328 - Fix chunkmemset #1196 - Fix deflateBound too small #1236 - Fix Z_SOLO #1263 - Fix ACLE variant of crc32 #1274 - Fix inflateBack #1311 - Fix deflate_quick windowsize #1431 - Fix DFLTCC bugs related to adler32 #1349 and #1390 - Fix warnings #1194 #1312 #1362 - MacOS build fix #1198 - Add invalid windowBits handling #1293 - Support for Force TZCNT #1186 - Support for aligned_alloc() #1360 - Minideflate improvements #1175 #1238 - Dont use unaligned access for memcpy #1309 - Build system #1209 #1233 #1267 #1273 #1278 #1292 #1316 #1318 #1365 - Test improvements #1208 #1227 #1241 #1353 - Cleanup #1266 - Documentation #1205 #1359 - Misc improvements #1294 #1297 #1306 #1344 #1348 - Backported zlib fixes - Backported CI workflows from Develop branch
Dead2
added a commit
that referenced
this pull request
Mar 17, 2023
Changes since 2.0.6: - Fix CVE-2022-37434 #1328 - Fix chunkmemset #1196 - Fix deflateBound too small #1236 - Fix Z_SOLO #1263 - Fix ACLE variant of crc32 #1274 - Fix inflateBack #1311 - Fix deflate_quick windowsize #1431 - Fix DFLTCC bugs related to adler32 #1349 and #1390 - Fix warnings #1194 #1312 #1362 - MacOS build fix #1198 - Add invalid windowBits handling #1293 - Support for Force TZCNT #1186 - Support for aligned_alloc() #1360 - Minideflate improvements #1175 #1238 - Dont use unaligned access for memcpy #1309 - Build system #1209 #1233 #1267 #1273 #1278 #1292 #1316 #1318 #1365 - Test improvements #1208 #1227 #1241 #1353 - Cleanup #1266 - Documentation #1205 #1359 - Misc improvements #1294 #1297 #1306 #1344 #1348 - Backported zlib fixes - Backported CI workflows from Develop branch
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
3 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Negative windowBits arguments are eventually turned positive in
deflateInit2_ and inflateInit2_ (more precisely in inflateReset2).
Such values are used to indicate that raw deflate/inflate should
be performed.
If a user supplies INT32_MIN for windowBits, the code will perform
-INT32_MIN which does not fit into int32_t. In fact, this is
undefined behavior in C and should be avoided.
Clearly this is a user error, but given the careful validation of
input arguments a few lines later in deflateInit2_ I think this
might be of interest.
Proof of Concept: