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| author | David Kaplan <david.kaplan@amd.com> | 2024-04-21 22:17:28 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-05-02 17:32:42 +0300 |
| commit | 3b1ce482e2e669fc8093035e9a9fabd7e6ff2289 (patch) | |
| tree | f2de07ff6c15b7254049e205378a1b62fe1dfd1f /rust | |
| parent | cec11fa2eb512ebe3a459c185f4aca1d44059bbf (diff) | |
| download | linux-3b1ce482e2e669fc8093035e9a9fabd7e6ff2289.tar.xz | |
x86/cpu: Fix check for RDPKRU in __show_regs()
commit b53c6bd5d271d023857174b8fd3e32f98ae51372 upstream.
cpu_feature_enabled(X86_FEATURE_OSPKE) does not necessarily reflect
whether CR4.PKE is set on the CPU. In particular, they may differ on
non-BSP CPUs before setup_pku() is executed. In this scenario, RDPKRU
will #UD causing the system to hang.
Fix by checking CR4 for PKE enablement which is always correct for the
current CPU.
The scenario happens by inserting a WARN* before setup_pku() in
identiy_cpu() or some other diagnostic which would lead to calling
__show_regs().
[ bp: Massage commit message. ]
Signed-off-by: David Kaplan <david.kaplan@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20240421191728.32239-1-bp@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'rust')
0 files changed, 0 insertions, 0 deletions