On Tue 2013-08-27 18:22:17, joeyli wrote: > 於 日，2013-08-25 於 18:43 +0200，Pavel Machek 提到： > > On Thu 2013-08-22 19:01:56, Lee, Chun-Yi wrote: > > > This patch introduced SNAPSHOT_SIG_HASH config for user to select which > > > hash algorithm will be used during signature generation of snapshot. > > > > > > v2: > > > Add define check of oCONFIG_SNAPSHOT_VERIFICATION in snapshot.c before > > > declare pkey_hash(). > > > > > > Reviewed-by: Jiri Kosina <jkosina@xxxxxxx> > > > Signed-off-by: Lee, Chun-Yi <jlee@xxxxxxxx> > > > --- > > > kernel/power/Kconfig | 46 ++++++++++++++++++++++++++++++++++++++++++++++ > > > kernel/power/snapshot.c | 27 ++++++++++++++++++++++----- > > > 2 files changed, 68 insertions(+), 5 deletions(-) > > > > > > diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig > > > index b592d88..79b34fa 100644 > > > --- a/kernel/power/Kconfig > > > +++ b/kernel/power/Kconfig > > > @@ -78,6 +78,52 @@ config SNAPSHOT_VERIFICATION > > > dependent on UEFI environment. EFI bootloader should generate the > > > key-pair. > > > > > > +choice > > > + prompt "Which hash algorithm should snapshot be signed with?" > > > + depends on SNAPSHOT_VERIFICATION > > > + help > > > + This determines which sort of hashing algorithm will be used during > > > + signature generation of snapshot. This algorithm _must_ be built into > > > + the kernel directly so that signature verification can take place. > > > + It is not possible to load a signed snapshot containing the algorithm > > > + to check the signature on that module. > > > > Like if 1000 ifdefs you already added to the code are not enough, you > > make some new ones? > > Pavel > > > > This SNAPSHOT_SIG_HASH kernel config is to select which SHA algorithms > used for generate digest of snapshot. The configuration will captured by > a const char* in code: > > +static const char *snapshot_hash = CONFIG_SNAPSHOT_SIG_HASH; > + > +static int pkey_hash(void) > > So, there doesn't have any ifdef block derived from this new config. I'd say select one hash function, and use it. There's no need to make it configurable. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
