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Evan Lambert
66691e272e
The refill_buf function uses snprintf to append to a fixed-size buffer. snprintf returns the length that would have been written, which can exceed the remaining buffer size. If this happens, ptr advances beyond the buffer and rem becomes negative. In the 2nd iteration, rem is treated as a large unsigned integer, causing snprintf to write oob. While this behavior is technically mitigated by num_perfcntrs being locked at 5, it's still unsafe if num_perfcntrs were ever to change/a second source was added. Signed-off-by: Evan Lambert <veyga@veygax.dev> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com> Patchwork: https://patchwork.freedesktop.org/patch/696358/ Link: https://lore.kernel.org/r/20251224124254.17920-3-veyga@veygax.dev Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
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.