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Diffstat (limited to 'changes/bug7352')
| -rw-r--r-- | changes/bug7352 | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/changes/bug7352 b/changes/bug7352 new file mode 100644 index 0000000000..74a878dbe0 --- /dev/null +++ b/changes/bug7352 @@ -0,0 +1,12 @@ + o Major bugfixes: + - Tor tries to wipe potentially sensitive data after using it, so + that if some subsequent security failure exposes Tor's memory, + the damage will be limited. But we had a bug where the compiler + was eliminating these wipe operations when it decided that the + memory was no longer visible to a (correctly running) program, + hence defeating our attempt at defense in depth. We fix that + by using OpenSSL's OPENSSL_cleanse() operation, which a compiler + is unlikely to optimize away. Future versions of Tor may use + a less ridiculously heavy approach for this. Fixes bug 7352. + Reported in an article by Andrey Karpov. + |