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- A symlink racing with rmdir of its target could reach a freed ->ci_dentry. The reference get_target() takes pins the config_item, not its dentry; the dentry is pinned by DCACHE_PERSISTENT, which configfs_remove_dir() drops while the item is still alive. Take the target's configfs_dirent under ->d_lock instead of chasing ->ci_dentry. - configfs_rmdir() left the dentry hashed across the final put of the item, and configfs_get_config_item() treats a hashed dentry as proof of a live item. A concurrent symlink could therefore resurrect a dying item and hit a use-after-free. Unhash in configfs_remove_dir(), while the item is still guaranteed to be there. Both issues were found by syzbot. -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEErIU5puj0ZwLKSkObNaOTn/x4d20FAmqe6GQACgkQNaOTn/x4 d21unBAAqg0vIxjQAGhQ/hZnnqdFJ9es63NE93H4ZZJzkLa9J5xqMnbAVAOUoPwo BIbUs4uNVunJdhx3hgiPFSjEB9g+d9xxuoxNLHNPFptQe720QJ5ETC5X/QCmCrUc QUOVLFN0EomOXXN7HK8+hKKTbslIFHDN2SmLkICprHwL6YKygginhhHaHGukY8Oo Mfro0MTaFaVvQM6137r9EB3pnR+i+mtwEDjyWxBQFH3/KtyPW0RrUiyPM5uBP5ds ECr1UsqMNFJfeLDH8T6SQ80hz/dczByo5OHyrMrmdmeQWmZLNEtKS0Q9L7kveS5L l5PuAH2f6PHcF+cziflvB1hVy/zFWAZ6aOUMdKJY7HBImMWnWdjhm2p9ssVVe0zy GlrXbULTekq7W4o/X70948hnk0jU3auHkeFSTHc6T/u8pt1HmKVV+Bg/uYsj8cFh +DSeR5iZwj5LaYQ9mMocZQucjEBjT/Cqy/N2sT2gvKqnbyQ0w1mJEeuXMrU23NsV 2oRSMcXYEraBw6Ccnq2E7LL97tKwLp4g7myUsUGjcAe6i1JSM8d1X9wDoyL9QaHs JTdHzIg0LoDX5hHjc7gBW2/Kj3cm8xvvs+lxjNM8aBIsszKTGVNakjA3IsI5UFax /1IhMMKiyhIGJO2APFlfAzViTPm04DuAkFM80zCdH9pRfvcD2DU= =kqSj -----END PGP SIGNATURE----- Merge tag 'configfs-7.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/leitao/linux Pull configfs fixes from Breno Leitao: - A symlink racing with rmdir of its target could reach a freed ->ci_dentry. The reference that get_target() takes pins the config_item, not its dentry; the dentry is pinned by DCACHE_PERSISTENT, which configfs_remove_dir() drops while the item is still alive. Take the target's configfs_dirent under ->d_lock instead of chasing ->ci_dentry. - configfs_rmdir() left the dentry hashed across the final put of the item, and configfs_get_config_item() treats a hashed dentry as proof of a live item. A concurrent symlink could therefore resurrect a dying item and hit a use-after-free. Unhash in configfs_remove_dir(), while the item is still guaranteed to be there. Both issues were found by syzbot. * tag 'configfs-7.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/leitao/linux: configfs: unhash the dentry before dropping the item in rmdir configfs: pin the symlink target's dirent instead of chasing ->ci_dentry |
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| ipc | ||
| kernel | ||
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| .pylintrc | ||
| .rustfmt.toml | ||
| COPYING | ||
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| MAINTAINERS | ||
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| README | ||
Linux kernel ============ The Linux kernel is the core of any Linux operating system. It manages hardware, system resources, and provides the fundamental services for all other software. Quick Start ----------- * Report a bug: See Documentation/admin-guide/reporting-issues.rst * Get the latest kernel: https://kernel.org * Build the kernel: See Documentation/admin-guide/quickly-build-trimmed-linux.rst * Join the community: https://lore.kernel.org/ Essential Documentation ----------------------- All users should be familiar with: * Building requirements: Documentation/process/changes.rst * Code of Conduct: Documentation/process/code-of-conduct.rst * License: See COPYING Documentation can be built with make htmldocs or viewed online at: https://www.kernel.org/doc/html/latest/ Who Are You? ============ Find your role below: * New Kernel Developer: Getting started with kernel development * Academic Researcher: Studying kernel internals and architecture * Security Expert: Hardening and vulnerability analysis * Backport/Maintenance Engineer: Maintaining stable kernels * System Administrator: Configuring and troubleshooting * Maintainer: Leading subsystems and reviewing patches * Hardware Vendor: Writing drivers for new hardware * Distribution Maintainer: Packaging kernels for distros * AI Coding Assistant: LLMs and AI-powered development tools For Specific Users ================== New Kernel Developer -------------------- Welcome! Start your kernel development journey here: * Getting Started: Documentation/process/development-process.rst * Your First Patch: Documentation/process/submitting-patches.rst * Coding Style: Documentation/process/coding-style.rst * Build System: Documentation/kbuild/index.rst * Development Tools: Documentation/dev-tools/index.rst * Kernel Hacking Guide: Documentation/kernel-hacking/hacking.rst * Core APIs: Documentation/core-api/index.rst Academic Researcher ------------------- Explore the kernel's architecture and internals: * Researcher Guidelines: Documentation/process/researcher-guidelines.rst * Memory Management: Documentation/mm/index.rst * Scheduler: Documentation/scheduler/index.rst * Networking Stack: Documentation/networking/index.rst * Filesystems: Documentation/filesystems/index.rst * RCU (Read-Copy Update): Documentation/RCU/index.rst * Locking Primitives: Documentation/locking/index.rst * Power Management: Documentation/power/index.rst Security Expert --------------- Security documentation and hardening guides: * Security Documentation: Documentation/security/index.rst * LSM Development: Documentation/security/lsm-development.rst * Self Protection: Documentation/security/self-protection.rst * Reporting Vulnerabilities: Documentation/process/security-bugs.rst * CVE Procedures: Documentation/process/cve.rst * Embargoed Hardware Issues: Documentation/process/embargoed-hardware-issues.rst * Security Features: Documentation/userspace-api/seccomp_filter.rst Backport/Maintenance Engineer ----------------------------- Maintain and stabilize kernel versions: * Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst * Backporting Guide: Documentation/process/backporting.rst * Applying Patches: Documentation/process/applying-patches.rst * Subsystem Profile: Documentation/maintainer/maintainer-entry-profile.rst * Git for Maintainers: Documentation/maintainer/configure-git.rst System Administrator -------------------- Configure, tune, and troubleshoot Linux systems: * Admin Guide: Documentation/admin-guide/index.rst * Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst * Sysctl Tuning: Documentation/admin-guide/sysctl/index.rst * Tracing/Debugging: Documentation/trace/index.rst * Performance Security: Documentation/admin-guide/perf-security.rst * Hardware Monitoring: Documentation/hwmon/index.rst Maintainer ---------- Lead kernel subsystems and manage contributions: * Maintainer Handbook: Documentation/maintainer/index.rst * Pull Requests: Documentation/maintainer/pull-requests.rst * Managing Patches: Documentation/maintainer/modifying-patches.rst * Rebasing and Merging: Documentation/maintainer/rebasing-and-merging.rst * Development Process: Documentation/process/maintainer-handbooks.rst * Maintainer Entry Profile: Documentation/maintainer/maintainer-entry-profile.rst * Git Configuration: Documentation/maintainer/configure-git.rst Hardware Vendor --------------- Write drivers and support new hardware: * Driver API Guide: Documentation/driver-api/index.rst * Driver Model: Documentation/driver-api/driver-model/driver.rst * Device Drivers: Documentation/driver-api/infrastructure.rst * Bus Types: Documentation/driver-api/driver-model/bus.rst * Device Tree Bindings: Documentation/devicetree/bindings/ * Power Management: Documentation/driver-api/pm/index.rst * DMA API: Documentation/core-api/dma-api.rst Distribution Maintainer ----------------------- Package and distribute the kernel: * Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst * ABI Documentation: Documentation/ABI/README * Kernel Configuration: Documentation/kbuild/kconfig.rst * Module Signing: Documentation/admin-guide/module-signing.rst * Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst * Tainted Kernels: Documentation/admin-guide/tainted-kernels.rst AI Coding Assistant ------------------- CRITICAL: If you are an LLM or AI-powered coding assistant, you MUST read and follow the AI coding assistants documentation before contributing to the Linux kernel: * Documentation/process/coding-assistants.rst This documentation contains essential requirements about licensing, attribution, and the Developer Certificate of Origin that all AI tools must comply with. Communication and Support ========================= * Mailing Lists: https://lore.kernel.org/ * IRC: #kernelnewbies on irc.oftc.net * Bugzilla: https://bugzilla.kernel.org/ * MAINTAINERS file: Lists subsystem maintainers and mailing lists * Email Clients: Documentation/process/email-clients.rst