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modpost: fix tee MODULE_DEVICE_TABLE built on big-endian host 

[ Upstream commit 7f54e00e58 ]

When MODULE_DEVICE_TABLE(tee, ) is built on a host with a different
endianness from the target architecture, it results in an incorrect
MODULE_ALIAS().

For example, see a case where drivers/char/hw_random/optee-rng.c
is built as a module for ARM little-endian.

If you build it on a little-endian host, you will get the correct
MODULE_ALIAS:

    $ grep MODULE_ALIAS drivers/char/hw_random/optee-rng.mod.c
    MODULE_ALIAS("tee:ab7a617c-b8e7-4d8f-8301-d09b61036b64*");

However, if you build it on a big-endian host, you will get a wrong
MODULE_ALIAS:

    $ grep MODULE_ALIAS drivers/char/hw_random/optee-rng.mod.c
    MODULE_ALIAS("tee:646b0361-9bd0-0183-8f4d-e7b87c617aab*");

The same problem also occurs when you enable CONFIG_CPU_BIG_ENDIAN,
and build it on a little-endian host.

This issue has been unnoticed because the ARM kernel is configured for
little-endian by default, and most likely built on a little-endian host
(cross-build on x86 or native-build on ARM).

The uuid field must not be reversed because uuid_t is an array of __u8.

Fixes: 0fc1db9d10 ("tee: add bus driver framework for TEE based devices")
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Masahiro Yamada 2023-10-08 02:04:44 +09:00 committed by Greg Kroah-Hartman
parent 90ab33735e
commit b6cffe8dd7
1 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
scripts/mod/file2alias.c
View File

@ -1302,13 +1302,13 @@ static int do_typec_entry(const char *filename, void *symval, char *alias)
/* Looks like: tee:uuid */
static int do_tee_entry(const char *filename, void *symval, char *alias)
{
DEF_FIELD(symval, tee_client_device_id, uuid);
DEF_FIELD_ADDR(symval, tee_client_device_id, uuid);
sprintf(alias, "tee:%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
uuid.b[0], uuid.b[1], uuid.b[2], uuid.b[3], uuid.b[4],
uuid.b[5], uuid.b[6], uuid.b[7], uuid.b[8], uuid.b[9],
uuid.b[10], uuid.b[11], uuid.b[12], uuid.b[13], uuid.b[14],
uuid.b[15]);
uuid->b[0], uuid->b[1], uuid->b[2], uuid->b[3], uuid->b[4],
uuid->b[5], uuid->b[6], uuid->b[7], uuid->b[8], uuid->b[9],
uuid->b[10], uuid->b[11], uuid->b[12], uuid->b[13], uuid->b[14],
uuid->b[15]);
add_wildcard(alias);
return 1;