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Fix build with KASAN 

The stock zstd code expects some helpers from ASAN if present.
This works fine in userland, but in kernel, KASAN also gets detected,
and lacks those helpers. So let's make some empty substitutes for
that case.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rich Ercolani <rincebrain@gmail.com>
Closes #12232
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Rich Ercolani 2021-06-26 01:28:12 -04:00 committed by GitHub
parent 5e2c8338bf
commit 2084e9f748
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1 changed files with 19 additions and 0 deletions
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19
module/zstd/zfs_zstd.c
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@ -202,6 +202,25 @@ static struct zstd_fallback_mem zstd_dctx_fallback;
static struct zstd_pool *zstd_mempool_cctx;
static struct zstd_pool *zstd_mempool_dctx;
/*
* The library zstd code expects these if ADDRESS_SANITIZER gets defined,
* and while ASAN does this, KASAN defines that and does not. So to avoid
* changing the external code, we do this.
*/
#if defined(__has_feature)
#if __has_feature(address_sanitizer)
#define ADDRESS_SANITIZER 1
#endif
#elif defined(__SANITIZE_ADDRESS__)
#define ADDRESS_SANITIZER 1
#endif
#if defined(_KERNEL) && defined(ADDRESS_SANITIZER)
void __asan_unpoison_memory_region(void const volatile *addr, size_t size);
void __asan_poison_memory_region(void const volatile *addr, size_t size);
void __asan_unpoison_memory_region(void const volatile *addr, size_t size) {};
void __asan_poison_memory_region(void const volatile *addr, size_t size) {};
#endif
static void
zstd_mempool_reap(struct zstd_pool *zstd_mempool)