mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-09-22 09:34:56 +02:00
Namhyung Kim
65a99264f5
The IBS software filter is filtering kernel samples for regular users in the PMI handler. It checks the instruction address in the IBS register to determine if it was in kernel mode or not. But it turns out that it's possible to report a kernel data address even if the instruction address belongs to user-space. Matteo Rizzo found that when an instruction raises an exception, IBS can report some kernel data addresses like IDT while holding the faulting instruction's RIP. To prevent an information leak, it should double check if the data address in PERF_SAMPLE_DATA is in the kernel space as well. [ mingo: Clarified the changelog ] Suggested-by: Matteo Rizzo <matteorizzo@google.com> Signed-off-by: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: https://lore.kernel.org/r/20250317163755.1842589-1-namhyung@kernel.org
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 reStructuredText 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.