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ZIO: Add overflow checks for linear buffers

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Since we use a limited set of kmem caches, quite often we have unused
memory after the end of the buffer.  Put there up to a 512-byte canary
when built with debug to detect buffer overflows at the free time.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes #15553
This commit is contained in:
Alexander Motin
2023-12-01 14:50:10 -05:00
committed by Brian Behlendorf
parent ad47eca195
commit e48195c816
2 changed files with 58 additions and 2 deletions
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lib/libspl/include/assert.h
+3
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@@ -64,6 +64,9 @@ libspl_assert(const char *buf, const char *file, const char *func, int line)
#undef verify
#endif
#define PANIC(fmt, a...) \
libspl_assertf(__FILE__, __FUNCTION__, __LINE__, fmt, ## a)
#define VERIFY(cond) \
(void) ((!(cond)) && \
libspl_assert(#cond, __FILE__, __FUNCTION__, __LINE__))