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Updated readme.md

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@ -215,7 +215,7 @@ completely and redirect all calls to the _mimalloc_ library instead .
## Environment Options
You can set further options either programmatically (using [`mi_option_set`](https://microsoft.github.io/mimalloc/group__options.html)),
or via environment variables.
or via environment variables:
- `MIMALLOC_SHOW_STATS=1`: show statistics when the program terminates.
- `MIMALLOC_VERBOSE=1`: show verbose messages.
@ -265,11 +265,11 @@ _mimalloc_ can be build in secure mode by using the `-DMI_SECURE=ON` flags in `c
to make mimalloc more robust against exploits. In particular:
- All internal mimalloc pages are surrounded by guard pages and the heap metadata is behind a guard page as well (so a buffer overflow
exploit cannot reach into the metadata),
exploit cannot reach into the metadata).
- All free list pointers are
[encoded](https://github.com/microsoft/mimalloc/blob/783e3377f79ee82af43a0793910a9f2d01ac7863/include/mimalloc-internal.h#L396)
with per-page keys which is used both to prevent overwrites with a known pointer, as well as to detect heap corruption,
- Double free's are detected (and ignored),
with per-page keys which is used both to prevent overwrites with a known pointer, as well as to detect heap corruption.
- Double free's are detected (and ignored).
- The free lists are initialized in a random order and allocation randomly chooses between extension and reuse within a page to
mitigate against attacks that rely on a predicable allocation order. Similarly, the larger heap blocks allocated by mimalloc
from the OS are also address randomized.