4c9d410f32
Cpio format reserves 8 bytes for an ASCII representation of a time_t timestamp. While 2106-02-07 06:28:15 UTC (time_t = 0xffffffff) is still some years in the future, a poorly chosen date string for KBUILD_BUILD_TIMESTAMP, converted into seconds since the epoch, might lead to exceeded cpio timestamp limits that result in a broken cpio archive. Add timestamp checks to prevent overrun of the 8-byte cpio header field. My colleague Thomas Kühnel discovered the behaviour, when we accidentally fed SOURCE_DATE_EPOCH to KBUILD_BUILD_TIMESTAMP as is: some timestamps (e.g. 1607420928 = 2021-12-08 9:48:48 UTC) will be interpreted by `date` as a valid date specification of science fictional times (here: year 160742). Even though this is bad input for KBUILD_BUILD_TIMESTAMP, it should not break the initramfs cpio format. Signed-off-by: Nicolas Schier <nicolas@fjasle.eu> Cc: Thomas Kühnel <thomas.kuehnel@avm.de> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> |
||
|---|---|---|
| Documentation | ||
| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
README
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.