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Use unsigned integer when shifting
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A UBSAN warning can be triggered when handling a long sequence of backticks:
src/commonmark.c:98:20: runtime error: left shift of 1 by 31 places cannot be represented in type 'int'
which can be triggered by:
```
| a | b |
| --- | --** `c```````````````````````````````- |
| c | `|d` \| e |
```
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A UBSAN warning can be triggered because the link title is an empty string:
src/inlines.c:113:20: runtime error: null pointer passed as argument 2, which is declared to never be null
which can be triggered by:
```
[f]:_
[f]
```
The length of the memcpy is zero so the NULL pointer is not dereferenced but it
is still undefined behaviour.
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This also brings the code into closer alignment with the wording
of the spec.
See jgm/CommonMark#467.
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Closes #211.
Found by google/oss-fuzz:
https://oss-fuzz.com/v2/testcase-detail/4686992824598528
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We got an array overflow in enumerated lists nested more than
10 deep with start number =/= 1.
Found by google/oss-fuzz.
https://oss-fuzz.com/v2/testcase-detail/5546760854306816
This commit also ensures that we don't try to set `enum_` counters
that aren't defined by LaTeX (generally up to enumv).
Closes #210.
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echo '[](xx:)' | ./build/src/cmark -t latex
Segmentation fault: 11
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This can be run locally with `make libFuzzer` but the harness will be
integrated into oss-fuzz for large-scale fuzzing.
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See https://github.com/jgm/cmark/issues/206.
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Revert "Remove normalize as an option per #190"
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E.g. cmark_node_get_url on a non-link or image.
Closes #155.
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Only ascii punctuation characters are escapable,
per the spec.
Closes #192.
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Closes #193.
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as documented!
Closes #202.
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Note, however, that this may not be needed at all:
the old code would have gone into an infinite loop
if the delimiter stack were not already freed.
If we can prove that the delimiter stack is empty
at this point, we could remove this; on the other hand,
it may not hurt to keep it here defensively.
Closes #189.
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Closes #188.
@nwellnhof - could you have a look and let me know if you
think this is a bad idea or could be improved?
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needed for multilib distros like Fedora
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The overflow could occur in the following condition:
the buffer ends with `\r` and the next memory address
contains `\n`.
Closes #184.
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Strong now goes inside Emph rather than the reverse,
when both scopes are possible.
The code is much simpler.
This also avoids a spec inconsistency that cmark had previously:
`***hi***` became Strong (Emph "hi")) but
`***hi****` became Emph (Strong "hi")) "*"
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* Don't double-output the link in latex-rendering.
* Prevent ligatures in dashes sensibly when rendering latex.
\- is a hyphenation, so it doesn't get displayed at all.
* Redo "Don't double-output the link in latex-rendering."
This reverts commit 8fb1f1c3c8799628141780ca5fd8d70883c1ec53
and adds the proper solution to the problem.
With commit 8fb1f1c3c double rendering is fixed, but the url isn't
escaped anymore, so I discarded the wrong copy.
We now return 0 from the function in case of a single link,
which stops processing the contents of the node.
* Add a comment about the double-rendering issue addressed in 1c0d4749451cf85a849a3cf8e41cf137789821d4
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CMake impovement
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Now you can enable/disable compilation and installation targets for
shared and static libraries via -DCMARK_SHARED=ON/OFF and
-DCMARK_STATIC=ON/OFF
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Replaced ${LIB_INSTALL_DIR} option with built-in ${LIB_SUFFIX} for installing
for 32/64-bit systems. Normally, CMake will set ${LIB_SUFFIX} automatically
for required enviroment.
If you have any issues with it, you can override this option with
-DLIB_SUFFIX=64 or -DLIB_SUFFIX="" during configuration.
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Noticed the need for this through fuzzing.
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We now use a much smaller array.
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This reverts commit 9e643720ec903f3b448bd2589a0c02c2514805ae.
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This reverts commit 4fbe344df43ed7f60a3d3a53981088334cb709fc.
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We need to store the length of the original delimiter run,
instead of using the length of the remaining delimiters
after some have been subtracted.
Test case:
a***b* c*
Thanks to Raph Levin for reporting.
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* Improve strbuf guarantees
Introduce BUFSIZE_MAX macro and make sure that the strbuf implementation
can handle strings up to this size.
* Abort early if document size exceeds internal limit
* Change types for source map offsets
Switch to size_t for the public API, making the public headers
C89-compatible again.
Switch to bufsize_t internally, reducing memory usage and improving
performance on 32-bit platforms.
* Make parser return NULL on internal index overflow
Make S_parser_feed set an error and ignore subsequent chunks if the
total input document size exceeds an internal limit. Make
cmark_parser_finish return NULL if an error was encountered. Add
public API functions to retrieve error code and error message.
strbuf overflow in renderers and OOM in parser or renderers still
cause an abort.
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* open_new_blocks: always create child before advancing offset
* Source map
* Extent's typology
* In-depth python bindings
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The `alloc` member wasn't initialized.
This also allows to add an assertion in `chunk_rtrim` which doesn't
work for alloced chunks.
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1. Downloaded CaseFolding.txt from http://unicode.org/Public/UCD/latest/ucd/CaseFolding.txt
2. Deleted src/case_fold_switch.inc
3. Ran `make src/case_fold_switch.inc`
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- Removed recursion in scan_to_closing_backticks
- Added an array of pointers to potential backtick closers
to subject
- This array is used to avoid traversing the subject again
when we've already seen all the potential backtick closers.
- Added a max bound of 1000 for backtick code span delimiters.
- This helps with pathological cases like:
x
x `
x ``
x ```
x ````
...
Thanks to Martin Mitáš for identifying the problem and for
discussion of solutions.
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