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63cafaf47a
One-element arrays as fake flex arrays are deprecated[1] as the kernel
has switched to C99 flexible-array members instead. This case, however,
has more complexity because it is a flexible array of flexible arrays
and this patch needs to be ready to enable the new compiler flag
-Wflex-array-member-not-at-end (coming in GCC-14) globally.
So, define a new struct type for the single reports:
struct report {
uint16_t size;
struct hostif_msg_hdr msg;
} __packed;
but without the payload (flex array) in it. And add this payload to the
"hostif_msg" structure. This way, in the "report_list" structure we can
declare a flex array of single reports which now do not contain another
flex array.
struct report_list {
[...]
struct report reports[];
} __packed;
Therefore, the "struct hostif_msg" is now made up of a header and a
payload. And the "struct report" uses only the "hostif_msg" header.
The perfect solution would be for the "report" structure to use the
whole "hostif_msg" structure but this is not possible due to nested
flexible arrays. Anyway, the end result is equivalent since this patch
does attempt to change the behaviour of the code.
Now as well, we have more clarity after the cast from the raw bytes to
the new structures. Refactor the code accordingly to use the new
structures.
Also, use "container_of()" whenever we need to retrieve a pointer to
the flexible structure, through which we can access the flexible array
if needed.
Link: https://www.kernel.org/doc/html/next/process/deprecated.html#zero-length-and-one-element-arrays [1]
Closes: https://github.com/KSPP/linux/issues/333
Signed-off-by: Erick Archer <erick.archer@outlook.com>
Link: https://lore.kernel.org/r/AS8PR02MB723760CB93942370E92F00638BF72@AS8PR02MB7237.eurprd02.prod.outlook.com
[kees: tweaked commit log and dropped struct_size() uses]
Signed-off-by: Kees Cook <kees@kernel.org>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
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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 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.