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Optional W^X policy for JIT pages (#112)

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This commit is contained in:
tevador
2019-08-25 13:47:40 +02:00
committed by GitHub
parent 971f10c9c2
commit 67010ab554
12 changed files with 195 additions and 55 deletions
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7
src/randomx.h
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@@ -44,6 +44,7 @@ typedef enum {
RANDOMX_FLAG_HARD_AES = 2,
RANDOMX_FLAG_FULL_MEM = 4,
RANDOMX_FLAG_JIT = 8,
RANDOMX_FLAG_SECURE = 16
} randomx_flags;
typedef struct randomx_dataset randomx_dataset;
@@ -135,12 +136,14 @@ RANDOMX_EXPORT void randomx_release_dataset(randomx_dataset *dataset);
/**
* Creates and initializes a RandomX virtual machine.
*
* @param flags is any combination of these 4 flags (each flag can be set or not set):
* @param flags is any combination of these 5 flags (each flag can be set or not set):
* RANDOMX_FLAG_LARGE_PAGES - allocate scratchpad memory in large pages
* RANDOMX_FLAG_HARD_AES - virtual machine will use hardware accelerated AES
* RANDOMX_FLAG_FULL_MEM - virtual machine will use the full dataset
* RANDOMX_FLAG_JIT - virtual machine will use a JIT compiler
* The numeric values of the flags are ordered so that a higher value will provide
* RANDOMX_FLAG_SECURE - when combined with RANDOMX_FLAG_JIT, the JIT pages are never
* writable and executable at the same time (W^X policy)
* The numeric values of the first 4 flags are ordered so that a higher value will provide
* faster hash calculation and a lower numeric value will provide higher portability.
* Using RANDOMX_FLAG_DEFAULT (all flags not set) works on all platforms, but is the slowest.
* @param cache is a pointer to an initialized randomx_cache structure. Can be