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| author | Jason A. Donenfeld <Jason@zx2c4.com> | 2022-11-18 17:38:23 +0100 |
|---|---|---|
| committer | Jason A. Donenfeld <Jason@zx2c4.com> | 2024-07-19 20:22:12 +0200 |
| commit | 33385150ac456f6f95a58647583d0a3887620729 (patch) | |
| tree | a1143f237d7f687825935bb496dcb0d39026e6be /arch/x86/Kconfig | |
| parent | 4ad10a5f5f78a5b3e525a63bd075a4eb1139dde1 (diff) | |
| download | linux-33385150ac456f6f95a58647583d0a3887620729.tar.gz linux-33385150ac456f6f95a58647583d0a3887620729.tar.bz2 linux-33385150ac456f6f95a58647583d0a3887620729.zip | |
x86: vdso: Wire up getrandom() vDSO implementation
Hook up the generic vDSO implementation to the x86 vDSO data page. Since
the existing vDSO infrastructure is heavily based on the timekeeping
functionality, which works over arrays of bases, a new macro is
introduced for vvars that are not arrays.
The vDSO function requires a ChaCha20 implementation that does not write
to the stack, yet can still do an entire ChaCha20 permutation, so
provide this using SSE2, since this is userland code that must work on
all x86-64 processors.
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Samuel Neves <sneves@dei.uc.pt> # for vgetrandom-chacha.S
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 1d7122a1883e..9c98b7a88cc2 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -287,6 +287,7 @@ config X86 select HAVE_UNSTABLE_SCHED_CLOCK select HAVE_USER_RETURN_NOTIFIER select HAVE_GENERIC_VDSO + select VDSO_GETRANDOM if X86_64 select HOTPLUG_PARALLEL if SMP && X86_64 select HOTPLUG_SMT if SMP select HOTPLUG_SPLIT_STARTUP if SMP && X86_32 |