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AUDIT
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0x1
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The allocator maintains a log that contains recent
history of its activity. The number of items logged
depends on whether CONTENTS is
also set. The log is a fixed size. When space is
exhausted, earlier records are reclaimed.
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TEST
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0x2
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The allocator writes a pattern into freed memory
and checks that the pattern is unchanged when the
buffer is next allocated. If some portion of the
buffer is changed, then the memory was probably used
by a client that had previously allocated and freed
the buffer. If an overwrite is identified, the
system panics.
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REDZONE
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0x4
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The allocator provides extra memory at the end of
the requested buffer and inserts a special pattern
into that memory. When the buffer is freed, the
pattern is checked to see if data was written past
the end of the buffer. If an overwrite is
identified, the kernel panics.
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CONTENTS
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0x8
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The allocator logs up to 256 bytes of buffer
contents when the buffer is freed. This flag
requires that AUDIT also be
set.
The numeric value of these flags can be logically
added together and set by the
/etc/system file.
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LITE
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0x100
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Does minimal integrity checking when a buffer is
allocated and freed. When enabled, the allocator
checks that the redzone has not been written into,
that a freed buffer is not being freed again, and
that the buffer being freed is the size that was
allocated. Do not combine this flag with any other
flags.
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