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443 Commits

Author SHA1 Message Date
Janos Follath
de0e3e352d Threading design: Update empty slot tracking 
Using a dedicated field allows clean separatin between key attributes
and slot state. This allows us to use the same mechanics for attributes
and key content. Which in turn means lower code size and easier
maintenance.

Signed-off-by: Janos Follath <janos.follath@arm.com>
 2023-10-20 15:12:42 +01:00
Janos Follath
52586895f7 Clarify threading design document structure 
Separate design analysis from plans and make the distinction clear
between what is implemented, what is planned to be implemented soon,
what is planned to be implemented in the future, and what is ideas that
are rejected.

(The distinction between the last two categories doesn't have to be
clear, we can't and shouldn't plan that far ahead.)

Signed-off-by: Janos Follath <janos.follath@arm.com>
 2023-10-20 14:26:57 +01:00
Janos Follath
19192a5158 Clarify reentrancy requirements for drivers 
Signed-off-by: Janos Follath <janos.follath@arm.com>
 2023-10-20 13:16:48 +01:00
David Horstmann
4e54abf182 Add section on possible use of Valgrind tracing 
Signed-off-by: David Horstmann <david.horstmann@arm.com>
 2023-10-19 17:59:45 +01:00
David Horstmann
05ca3d9a1b Expand design for validation of careful access 
Signed-off-by: David Horstmann <david.horstmann@arm.com>
 2023-10-19 16:45:37 +01:00
David Horstmann
a72b4ca734 Modify optimize-testing instructions 
Mention -flto and whole-program optimization as this is the most
important aspect.

Signed-off-by: David Horstmann <david.horstmann@arm.com>
 2023-10-19 15:22:15 +01:00
David Horstmann
3f7e42a750 Move implementation by module table earlier 
Signed-off-by: David Horstmann <david.horstmann@arm.com>
 2023-10-19 15:14:50 +01:00
David Horstmann
dae0ad439f Add more detail in design of memory poisoning 
Signed-off-by: David Horstmann <david.horstmann@arm.com>
 2023-10-19 15:12:34 +01:00
David Horstmann
0bd87f5959 Change unsigned int to uint8_t 
Signed-off-by: David Horstmann <david.horstmann@arm.com>
 2023-10-19 13:45:21 +01:00
David Horstmann
23661cc232 Detailed design of memory protection strategy 
Signed-off-by: David Horstmann <david.horstmann@arm.com>
 2023-10-18 18:20:33 +01:00
Gilles Peskine
df62f1a010 Merge pull request #1106 from gilles-peskine-arm/psa-shared-buffers-requirements 
PSA shared buffers requirements
 2023-10-17 20:38:00 +02:00
Janos Follath
d7a39ae21e Add plan for 3.6 to threading design 
Signed-off-by: Janos Follath <janos.follath@arm.com>
 2023-10-17 14:34:26 +01:00
Janos Follath
574100bb0d Add clarifications to thread safety design 
Signed-off-by: Janos Follath <janos.follath@arm.com>
 2023-10-17 12:50:28 +01:00
Janos Follath
811a954383 Add reentrancy section to thread safety design 
Signed-off-by: Janos Follath <janos.follath@arm.com>
 2023-10-17 12:50:21 +01:00
Gilles Peskine
8ebeb9c180 Test for read-read inconsistency with mprotect and ptrace/gdb 
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2023-10-16 18:37:02 +02:00
Gilles Peskine
87889ebe86 Fix editorial error with semantic consequences 
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2023-10-16 15:40:02 +02:00
Gilles Peskine
a3ce6437bf Typos 
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2023-10-16 15:39:37 +02:00
Gilles Peskine
1f2802c403 Suggest validating copy by memory poisoning 
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2023-10-13 21:49:17 +02:00
Gilles Peskine
6998721c69 Add a section skeleton for copy bypass 
It's something we're likely to want to do at some point.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2023-10-13 20:05:32 +02:00
Gilles Peskine
7bc1bb65e9 Short explanations of what is expected in the design sections 
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2023-10-13 20:05:25 +02:00
Gilles Peskine
35de1f7a7d Distinguish whole-message signature from other asymmetric cryptography 
Whole-message signature may process the message multiple times (EdDSA
signature does it).

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2023-10-13 20:04:16 +02:00
Gilles Peskine
9cad3b3a70 Design change for cipher/AEAD 
There are many reasons why a driver might violate the security requirements
for plaintext or ciphertext buffers, so mandate copying.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2023-10-13 20:03:18 +02:00
Gilles Peskine
2859267a27 Clarify terminology: built-in driver 
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2023-10-13 20:02:00 +02:00
Gilles Peskine
db00543b3a Add a section on write-read feedback 
It's a security violation, although it's not clear whether it really needs
to influence the design.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2023-10-13 19:57:53 +02:00
Gilles Peskine
352095ca86 Simplify the relaxed output-output rule 
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2023-10-13 19:56:22 +02:00
Gilles Peskine
60c453ee72 Expand explanations of the vulnerabilities 
Add a few more examples.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2023-10-13 19:07:56 +02:00
Gilles Peskine
8daedaeac9 Fix typos and copypasta 
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2023-10-13 18:47:29 +02:00
Gilles Peskine
f7806ca782 Analyze requirements for protection of arguments in shared memory 
Propose a dual-approach strategy where some buffers are copied and others
can remain shared.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2023-10-12 16:00:11 +02:00
Manuel Pégourié-Gonnard
f1878d8974 Update to only serve GCM and CCM 
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
 2023-10-12 11:19:00 +02:00
Gilles Peskine
bb5d907aa9 Automatically pick up all Markdown files 
Assume GNU make. We already do with the toplevel makefile.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2023-10-11 20:47:44 +02:00
Janos Follath
28b4da954b Add PSA threading design 
Signed-off-by: Janos Follath <janos.follath@arm.com>
 2023-10-10 15:15:55 +01:00
Manuel Pégourié-Gonnard
301d2a29a7 Update to MD light section 
Mostly to reflect this has been implemented, and remove references to
temporary remains from the previous strategy (hash_info, legacy_or_psa)
which would probably be more confusing than helpful at this point.

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
 2023-10-10 10:04:07 +02:00
Manuel Pégourié-Gonnard
2daee0410e Update list of modules using hashes 
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
 2023-10-10 10:04:07 +02:00
Manuel Pégourié-Gonnard
ca18b7747e Update definition of Cipher light 
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
 2023-10-10 10:04:07 +02:00
Manuel Pégourié-Gonnard
839d3580bd Update details of modules using cipher operations 
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
 2023-10-10 09:22:59 +02:00
Gilles Peskine
32743619a2 Merge pull request #8114 from yanesca/threading_requirements_update 
Refine thread safety requirements
 2023-10-09 11:22:59 +00:00
Xiaokang Qian
db3035b8bc Fix a typo in psa-crypto-implementation-structure.md 
Signed-off-by: Xiaokang Qian <xiaokang.qian@arm.com>
 2023-09-26 09:09:20 +00:00
Xiaokang Qian
76e55a20dd Change the documenti about psa_crypto_driver_wrappers.c{h} 
Signed-off-by: Xiaokang Qian <xiaokang.qian@arm.com>
 2023-09-26 09:09:20 +00:00
Xiaokang Qian
1198e43644 Change the description of auto-generated driver dispatch files 
Signed-off-by: Xiaokang Qian <xiaokang.qian@arm.com>
 2023-09-26 09:09:20 +00:00
Xiaokang Qian
845693c513 Change comments to psa_crypto_driver_wrappers.h 
Signed-off-by: Xiaokang Qian <xiaokang.qian@arm.com>
 2023-09-26 09:09:20 +00:00
Janos Follath
b4527fbd82 Add clarifications to the threading requirements 
Signed-off-by: Janos Follath <janos.follath@arm.com>
 2023-08-31 14:01:24 +01:00
Janos Follath
b6954730f0 Fix typo 
Co-authored-by: Ronald Cron <ronald.cron@arm.com>
Signed-off-by: Janos Follath <janos.follath@arm.com>
 2023-08-31 13:54:21 +01:00
Janos Follath
35633dd977 Add threading non-requirement 
State explicitly the non-requirement that it's ok for psa_destroy_key to
block waiting for a driver.

Signed-off-by: Janos Follath <janos.follath@arm.com>
 2023-08-31 08:31:19 +01:00
Janos Follath
15d9ec29be Improve thread safety presentation 
- Use unique section titles so that there are unique anchors
- Make list style consistent between similar sections

Signed-off-by: Janos Follath <janos.follath@arm.com>
 2023-08-31 08:22:21 +01:00
Janos Follath
0385c2815c Tighten thread safety requirements 
We shouldn't violate the requirement that the key identifier can be
reused. In practice, a key manager may destroy a key that's in use by
another process, and the privileged world containing the key manager and
the crypto service should not be perturbed by an unprivileged process.

With respect to blocking, again, a key manager should not be blocked
indefinitely by an unprivileged application.

These are desirable properties even in the short term.

Signed-off-by: Janos Follath <janos.follath@arm.com>
 2023-08-30 16:44:04 +01:00
Janos Follath
7ec993d804 Refine thread safety requirements 
Split and refine short term requirements for key deletion.

Signed-off-by: Janos Follath <janos.follath@arm.com>
 2023-08-23 16:04:48 +01:00
Manuel Pégourié-Gonnard
36cd3f9f8e Add tentative definition of Cipher light 
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
 2023-08-11 10:06:42 +02:00
Manuel Pégourié-Gonnard
948137be59 Add details on use of ciphers from other modules 
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
 2023-08-10 16:58:30 +02:00
Gilles Peskine
33291ba35f Merge pull request #5538 from gilles-peskine-arm/psa-thread_safety-doc 
PSA thread safety requirements
 2023-08-10 16:21:55 +02:00
Gilles Peskine
9aa93c8e78 Added a note about new primitives for secure destruction 
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2023-08-07 16:32:09 +02:00