| Message ID | 20210330040001.31524-1-rdunlap@infradead.org |
|---|---|
| State | New |
| Headers | show |
| Series | Documentation: crypto: add info about "fips=" boot option | expand |
On Mon, Mar 29, 2021 at 09:00:01PM -0700, Randy Dunlap wrote: > > + If fips_enabled = 1, some crypto tests are skipped. I don't think any tests are skipped. It does however disable many algorithms by essentially failing them at the testing stage. Cheers,
On Mon, Mar 29, 2021 at 10:00:45PM -0700, Randy Dunlap wrote: > On 3/29/21 9:37 PM, Herbert Xu wrote: > > On Mon, Mar 29, 2021 at 09:00:01PM -0700, Randy Dunlap wrote: > >> > >> + If fips_enabled = 1, some crypto tests are skipped. > > > > I don't think any tests are skipped. It does however disable > > many algorithms by essentially failing them at the testing stage. > > That statement was based on crypto/testmgr.c (in 4 places): > > if (fips_enabled && template[i].fips_skip) > continue; By skipping the test, the algorithm effectively fails the self-test and therefore is disabled. Cheers,
--- linux-next-20210329.orig/Documentation/admin-guide/kernel-parameters.txt +++ linux-next-20210329/Documentation/admin-guide/kernel-parameters.txt @@ -1370,6 +1370,21 @@ See Documentation/admin-guide/sysctl/net.rst for fb_tunnels_only_for_init_ns + fips= Format: { 0 | 1} + Use to disable (0) or enable (1) FIPS mode. + If enabled, any process that is waiting on the + 'fips_fail_notif_chain' will be notified of fips + failures. + This setting can also be modified via sysctl at + /proc/sysctl/crypto/fips_enabled, i.e., + crypto.fips_enabled. + If fips_enabled = 1, some crypto tests are skipped. + It can also effect which ECC curve is used. + If fips_enabled = 1 and a test fails, it will cause a + kernel panic. + If fips_enabled = 1, RSA test requires a key size of + 2K or larger. + floppy= [HW] See Documentation/admin-guide/blockdev/floppy.rst.
Having just seen a report of using "fips=1" on the kernel command line, I could not find it documented anywhere, so add some help for it. Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Cc: Dexuan Cui <decui@microsoft.com> Cc: linux-crypto@vger.kernel.org Cc: Eric Biggers <ebiggers@kernel.org> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jonathan Corbet <corbet@lwn.net> Cc: linux-doc@vger.kernel.org --- Updates/corrections welcome. Documentation/admin-guide/kernel-parameters.txt | 15 ++++++++++++++ 1 file changed, 15 insertions(+)