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| author | David Howells <dhowells@redhat.com> | 2012-10-22 15:05:48 +0100 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2012-12-05 11:27:24 +1030 |
| commit | 12e130b04580532aa099893158aa2776b321ae7f (patch) | |
| tree | b7a6ed562d7293aa1e5b584e109a9669db253f49 /kernel/module_signing.c | |
| parent | df2fc246c8ee8b6067af1fa55d3bc23107457f61 (diff) | |
| download | lwn-12e130b04580532aa099893158aa2776b321ae7f.tar.gz lwn-12e130b04580532aa099893158aa2776b321ae7f.zip | |
MODSIGN: Don't use enum-type bitfields in module signature info block
Don't use enum-type bitfields in the module signature info block as we can't be
certain how the compiler will handle them. As I understand it, it is arch
dependent, and it is possible for the compiler to rearrange them based on
endianness and to insert a byte of padding to pad the three enums out to four
bytes.
Instead use u8 fields for these, which the compiler should emit in the right
order without padding.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'kernel/module_signing.c')
| -rw-r--r-- | kernel/module_signing.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/kernel/module_signing.c b/kernel/module_signing.c index ea1b1df5dbb0..f2970bddc5ea 100644 --- a/kernel/module_signing.c +++ b/kernel/module_signing.c @@ -27,13 +27,13 @@ * - Information block */ struct module_signature { - enum pkey_algo algo : 8; /* Public-key crypto algorithm */ - enum pkey_hash_algo hash : 8; /* Digest algorithm */ - enum pkey_id_type id_type : 8; /* Key identifier type */ - u8 signer_len; /* Length of signer's name */ - u8 key_id_len; /* Length of key identifier */ - u8 __pad[3]; - __be32 sig_len; /* Length of signature data */ + u8 algo; /* Public-key crypto algorithm [enum pkey_algo] */ + u8 hash; /* Digest algorithm [enum pkey_hash_algo] */ + u8 id_type; /* Key identifier type [enum pkey_id_type] */ + u8 signer_len; /* Length of signer's name */ + u8 key_id_len; /* Length of key identifier */ + u8 __pad[3]; + __be32 sig_len; /* Length of signature data */ }; /* |