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fbfdc1b6f8
The size of struct rt_firmware_hdr is 36 bytes.
$ pahole -C rt_firmware_hdr drivers/staging/r8188eu/r8188eu.o
struct rt_firmware_hdr {
__le16 Signature; /* 0 2 */
u8 Category; /* 2 1 */
u8 Function; /* 3 1 */
__le16 Version; /* 4 2 */
u8 Subversion; /* 6 1 */
/* XXX 1 byte hole, try to pack */
u16 Rsvd1; /* 8 2 */
u8 Month; /* 10 1 */
u8 Date; /* 11 1 */
u8 Hour; /* 12 1 */
u8 Minute; /* 13 1 */
__le16 RamCodeSize; /* 14 2 */
u8 Foundry; /* 16 1 */
u8 Rsvd2; /* 17 1 */
/* XXX 2 bytes hole, try to pack */
__le32 SvnIdx; /* 20 4 */
u32 Rsvd3; /* 24 4 */
u32 Rsvd4; /* 28 4 */
u32 Rsvd5; /* 32 4 */
/* size: 36, cachelines: 1, members: 17 */
/* sum members: 33, holes: 2, sum holes: 3 */
/* last cacheline: 36 bytes */
};
But the header in the firmware file is only 32 bytes long.
The hexdump of rtl8188eufw.bin shows that the field Rsvd1 should be u8
instead of __le16.
OFFSET rtl8188eufw.bin
-----------------------------------------------------------
0x00000000 E1 88 10 00 0B 00 01 00 01 21 11 27 30 36 00 00
0x00000010 2D 07 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x00000000 E1 88 10 00 0B 00 01 00 01 21 11 27 30 36 00 00
^ ^ ^ ^ ^ ^
Subversion Rsvd1 Month Date Hour Minute
With the change of field Rsvd1 from __le16 to u8 the structure has the
correct size 32.
$ pahole -C rt_firmware_hdr drivers/staging/r8188eu/r8188eu.o
struct rt_firmware_hdr {
__le16 Signature; /* 0 2 */
u8 Category; /* 2 1 */
u8 Function; /* 3 1 */
__le16 Version; /* 4 2 */
u8 Subversion; /* 6 1 */
u8 Rsvd1; /* 7 1 */
u8 Month; /* 8 1 */
u8 Date; /* 9 1 */
u8 Hour; /* 10 1 */
u8 Minute; /* 11 1 */
__le16 RamCodeSize; /* 12 2 */
u8 Foundry; /* 14 1 */
u8 Rsvd2; /* 15 1 */
__le32 SvnIdx; /* 16 4 */
u32 Rsvd3; /* 20 4 */
u32 Rsvd4; /* 24 4 */
u32 Rsvd5; /* 28 4 */
/* size: 32, cachelines: 1, members: 17 */
/* last cacheline: 32 bytes */
The wrong size had no effect because the header size is hardcoded to
32 where it is used in the code and the fields after Subversion are
not used.
Fixes:
|
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| 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 | ||
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.