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  1. 12 Apr, 2019 1 commit
  3. 13 Mar, 2019 4 commits
  5. 28 Feb, 2019 9 commits
  7. 26 Feb, 2019 6 commits
  9. 19 Feb, 2019 1 commit
  11. 17 Aug, 2018 1 commit
  13. 08 Jun, 2018 1 commit
  15. 23 May, 2018 2 commits
    • Dimitris Papastamos's avatar
      Add support for dynamic mitigation for CVE-2018-3639 · fe007b2e
      Dimitris Papastamos authored 
      

Some CPUS may benefit from using a dynamic mitigation approach for
CVE-2018-3639.  A new SMC interface is defined to allow software
executing in lower ELs to enable or disable the mitigation for their
execution context.

It should be noted that regardless of the state of the mitigation for
lower ELs, code executing in EL3 is always mitigated against
CVE-2018-3639.

NOTE: This change is a compatibility break for any platform using
the declare_cpu_ops_workaround_cve_2017_5715 macro.  Migrate to
the declare_cpu_ops_wa macro instead.

Change-Id: I3509a9337ad217bbd96de9f380c4ff8bf7917013
Signed-off-by: default avatarDimitris Papastamos <dimitris.papastamos@arm.com>
      fe007b2e
    • Dimitris Papastamos's avatar
      Implement static workaround for CVE-2018-3639 · b8a25bbb
      Dimitris Papastamos authored 
      For affected CPUs, this approach enables the mitigation during EL3
initialization, following every PE reset. No mechanism is provided to
disable the mitigation at runtime.

This approach permanently mitigates the entire software stack and no
additional mitigation code is required in other software components.

TF-A implements this approach for the following affected CPUs:

*   Cortex-A57 and Cortex-A72, by setting bit 55 (Disable load pass store) of
    `CPUACTLR_EL1` (`S3_1_C15_C2_0`).

*   Cortex-A73, by setting bit 3 of `S3_0_C15_C0_0` (not documented in the
    Technical Reference Manual (TRM)).

*   Cortex-A75, by setting bit 35 (reserved in TRM) of `CPUACTLR_EL1`
    (`S3_0_C15_C1_0`).

Additionally, a new SMC interface is implemented to allow software
executing in lower ELs to discover whether the system is mitigated
against CVE-2018-3639.

Refer to "Firmware interfaces for mitigating cache speculation
vulnerabilities System Software on Arm Systems"[0] for more
information.

[0] https://developer.arm.com/cache-speculation-vulnerability-firmware-specification



Change-Id: I084aa7c3bc7c26bf2df2248301270f77bed22ceb
Signed-off-by: default avatarDimitris Papastamos <dimitris.papastamos@arm.com>
      b8a25bbb
  17. 11 Jan, 2018 1 commit
    • Dimitris Papastamos's avatar
      Workaround for CVE-2017-5715 on Cortex A57 and A72 · f62ad322
      Dimitris Papastamos authored 
      

Invalidate the Branch Target Buffer (BTB) on entry to EL3 by disabling
and enabling the MMU.  To achieve this without performing any branch
instruction, a per-cpu vbar is installed which executes the workaround
and then branches off to the corresponding vector entry in the main
vector table.  A side effect of this change is that the main vbar is
configured before any reset handling.  This is to allow the per-cpu
reset function to override the vbar setting.

This workaround is enabled by default on the affected CPUs.

Change-Id: I97788d38463a5840a410e3cea85ed297a1678265
Signed-off-by: default avatarDimitris Papastamos <dimitris.papastamos@arm.com>
      f62ad322
  19. 07 Sep, 2017 2 commits
  21. 28 Jun, 2017 1 commit
    • Douglas Raillard's avatar
      Introduce TF_LDFLAGS · c2b8806f
      Douglas Raillard authored 
      

Use TF_LDFLAGS from the Makefiles, and still append LDFLAGS as well to
the compiler's invocation. This allows passing extra options from the
make command line using LDFLAGS.

Document new LDFLAGS Makefile option.

Change-Id: I88c5ac26ca12ac2b2d60a6f150ae027639991f27
Signed-off-by: default avatarDouglas Raillard <douglas.raillard@arm.com>
      c2b8806f
  23. 22 Jun, 2017 1 commit
    • Douglas Raillard's avatar
      Apply workarounds for A53 Cat A Errata 835769 and 843419 · a94cc374
      Douglas Raillard authored 
      These errata are only applicable to AArch64 state. See the errata notice
for more details:
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.epm048406/index.html



Introduce the build options ERRATA_A53_835769 and ERRATA_A53_843419.
Enable both of them for Juno.

Apply the 835769 workaround as following:
* Compile with -mfix-cortex-a53-835769
* Link with --fix-cortex-a53-835769

Apply the 843419 workaround as following:
* Link with --fix-cortex-a53-843419

The erratum 843419 workaround can lead the linker to create new sections
suffixed with "*.stub*" and 4KB aligned. The erratum 835769 can lead the
linker to create new "*.stub" sections with no particular alignment.

Also add support for LDFLAGS_aarch32 and LDFLAGS_aarch64 in Makefile for
architecture-specific linker options.

Change-Id: Iab3337e338b7a0a16b0d102404d9db98c154f8f8
Signed-off-by: default avatarDouglas Raillard <douglas.raillard@arm.com>
      a94cc374
  25. 03 May, 2017 1 commit
  27. 20 Mar, 2017 1 commit
    • Andre Przywara's avatar
      Add workaround for ARM Cortex-A53 erratum 855873 · b75dc0e4
      Andre Przywara authored 
      

ARM erratum 855873 applies to all Cortex-A53 CPUs.
The recommended workaround is to promote "data cache clean"
instructions to "data cache clean and invalidate" instructions.
For core revisions of r0p3 and later this can be done by setting a bit
in the CPUACTLR_EL1 register, so that hardware takes care of the promotion.
As CPUACTLR_EL1 is both IMPLEMENTATION DEFINED and can be trapped to EL3,
we set the bit in firmware.
Also we dump this register upon crashing to provide more debug
information.

Enable the workaround for the Juno boards.

Change-Id: I3840114291958a406574ab6c49b01a9d9847fec8
Signed-off-by: default avatarAndre Przywara <andre.przywara@arm.com>
      b75dc0e4
  29. 08 Mar, 2017 1 commit
    • Antonio Nino Diaz's avatar
      Apply workaround for errata 813419 of Cortex-A57 · ccbec91c
      Antonio Nino Diaz authored 
      

TLBI instructions for EL3 won't have the desired effect under specific
circumstances in Cortex-A57 r0p0. The workaround is to execute DSB and
TLBI twice each time.

Even though this errata is only needed in r0p0, the current errata
framework is not prepared to apply run-time workarounds. The current one
is always applied if compiled in, regardless of the CPU or its revision.

This errata has been enabled for Juno.

The `DSB` instruction used when initializing the translation tables has
been changed to `DSB ISH` as an optimization and to be consistent with
the barriers used for the workaround.

Change-Id: Ifc1d70b79cb5e0d87e90d88d376a59385667d338
Signed-off-by: default avatarAntonio Nino Diaz <antonio.ninodiaz@arm.com>
      ccbec91c
  31. 23 Feb, 2017 1 commit
  33. 21 Apr, 2016 6 commits