20752312ea
fdlist_extend() grows a task group's descriptor table to 'row' rows of CONFIG_NFILE_DESCRIPTORS_PER_BLOCK entries each, and guards the growth against OPEN_MAX: if (CONFIG_NFILE_DESCRIPTORS_PER_BLOCK * (orig_rows + 1) > OPEN_MAX) The check sizes the table at orig_rows + 1, which assumes the caller only ever grows by a single block. The function then allocates 'row' rows, so the two agree only for growth by one. Callers do skip ahead. fdlist_dup3() asks for fd2 / CONFIG_NFILE_DESCRIPTORS_PER_BLOCK + 1, fdlist_dupfile() for the row holding minfd, and fdlist_copy() for the row holding a parent descriptor it is duplicating. Any of those can request a row well past orig_rows + 1. Such a request passes the check and the function then allocates and installs a table with more than OPEN_MAX descriptors. With the defaults (8 per block, OPEN_MAX 256) a process holding one row that calls dup2(fd, 400) ends up with 51 rows, or 408 descriptor slots, against a 256 limit. Check the row actually being requested. For single-block growth row == orig_rows + 1 and the comparison is unchanged. Signed-off-by: AlmAck <gluca86@gmail.com> |
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| binfmt | ||
| boards | ||
| cmake | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| dummy | ||
| fs | ||
| graphics | ||
| include | ||
| libs | ||
| mm | ||
| net | ||
| openamp | ||
| pass1 | ||
| sched | ||
| syscall | ||
| tools | ||
| video | ||
| wireless | ||
| .asf.yaml | ||
| .codespell-ignore-lines | ||
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| .editorconfig | ||
| .gitignore | ||
| .gitmessage | ||
| .pre-commit-config.yaml | ||
| .yamllint | ||
| AUTHORS | ||
| CMakeLists.txt | ||
| CONTRIBUTING.md | ||
| INVIOLABLES.md | ||
| Kconfig | ||
| LICENSE | ||
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| NOTICE | ||
| README.md | ||
| ReleaseNotes | ||
Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).
For brevity, many parts of the documentation will refer to Apache NuttX as simply NuttX.
Getting Started
First time on NuttX? Read the Getting Started guide! If you don't have a board available, NuttX has its own simulator that you can run on terminal.
Documentation
You can find the current NuttX documentation on the Documentation Page.
Alternatively, you can build the documentation yourself by following the Documentation Build Instructions.
The old NuttX documentation is still available in the Apache wiki.
Supported Boards
NuttX supports a wide variety of platforms. See the full list on the Supported Platforms page.
Contributing
If you wish to contribute to the NuttX project, read the Contributing guidelines for information on Git usage, coding standard, workflow and the NuttX principles.
License
The code in this repository is under either the Apache 2 license, or a license compatible with the Apache 2 license. See the License Page for more information.