cwpearson/perfect
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

add some discussion of ASLR tools

Browse Source
This commit is contained in:
Carl Pearson
2019-09-25 15:49:20 -05:00
parent 64eb67cc2d
commit 33243fe3bb
1 changed files with 40 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
README.md
View File

@@ -100,6 +100,11 @@ See [tools/no_aslr.cpp](tools/no_aslr.cpp)
* `Result get_aslr(AslrState &state)`: save the current ASLR state * `Result get_aslr(AslrState &state)`: save the current ASLR state
* `Result set_aslr(const AslrState &state)`: set a previously-saved ASLR state * `Result set_aslr(const AslrState &state)`: set a previously-saved ASLR state
### Flush file system caches ### Flush file system caches
`perfect` can drop various filesystem caches `perfect` can drop various filesystem caches
@@ -188,6 +193,41 @@ See [examples/cpu_cache.cpp](examples/cpu_cache.cpp).
* `void flush_all(void *p, const size_t n)`: Flush all cache lines starting at `p` for `n` bytes. * `void flush_all(void *p, const size_t n)`: Flush all cache lines starting at `p` for `n` bytes.
## Tools
### tools/addr
Print the address of `main`, a stack variable, and a heap variable.
Useful for demoing ASLR.
### tools/no-aslr
Disable ASLR on the provided execution.
With ASLR, addresses are different with each invocation
```
$ tools/addr
main: 94685074364704
stack: 140734279743492
heap: 94685084978800
$ tools/addr
main: 93891046344992
stack: 140722671706708
heap: 93891068624496
```
Without ASLR, addresses are the same in each invocation
```
$ tools/no-aslr tools/addrs
main: 93824992233760
stack: 140737488347460
heap: 93824994414192
$ tools/no-aslr tools/addrs
main: 93824992233760
stack: 140737488347460
heap: 93824994414192
```
## Changelog ## Changelog
* v0.5.0 * v0.5.0