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A call to memblock_free() or memblock_phys_free() issued after memblock data is discarded will result in use after free in memblock_isolate_range(). When CONFIG_KASAN is enabled, this will cause a panic early in boot. Without CONFIG_KASAN, there is a chance that memblock_isolate_range() might scribble on memory that is now in use by somebody else. Avoid those issues by making sure that memblock_discard points memblock.reserved.regions back at the static buffer. If memblock_free() or memblock_phys_free() is called after memblock memory is discarded, that will print a warning in memblock_remove_region(). -----BEGIN PGP SIGNATURE----- iQFEBAABCgAuFiEEeOVYVaWZL5900a/pOQOGJssO/ZEFAmTB94cQHHJwcHRAa2Vy bmVsLm9yZwAKCRA5A4Ymyw79kesHB/4rNvGFGEI8LFxooARLt8glcv0Hn7oJ+z3L Xyczw1ZkglT3DEYsoY78bSriddWPqrV3wWkr+p2NYXPBJWgQZ6t3DRZviqzXcj2l Ew2XwLAfT6Vay1eqEFfJJvkGg27QLhnmJPnjDzCWweiXUaR5xOESwKCBmZBWeXUU t5EFJMIXLVEoBDLGW5kk+Q4RZDqhU/sJWDqf4ciWQ5vDS8OFTr56hfth7T8XoMxm BPlC21+cEJUWrbb1gAJUMbIERTzvYg8odZqSAESlHyNyDEtYjyLce5W6HA6zHK+H 2gqiti+Pd1OyHbJUc1lN7iRTE8FJ7DQcBr6H9sk81Po5af02Ky7m =FRx8 -----END PGP SIGNATURE----- Merge tag 'fixes-2023-07-27' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock Pull memblock fix from Mike Rapoport: "A call to memblock_free() or memblock_phys_free() issued after memblock data is discarded will result in use after free in memblock_isolate_range(). Avoid those issues by making sure that memblock_discard points memblock.reserved.regions back at the static buffer" * tag 'fixes-2023-07-27' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock: mm,memblock: reset memblock.reserved to system init state to prevent UAF |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.