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| author | Mounir IDRASSI <mounir.idrassi@idrix.fr> | 2016-09-24 23:36:13 +0200 |
|---|---|---|
| committer | Mounir IDRASSI <mounir.idrassi@idrix.fr> | 2016-10-17 18:40:14 +0200 |
| commit | 77d070fe7384bfb0c6dece81e4900e603b13ee6c (patch) | |
| tree | d1596436592199cad8ed7654253e167e87422ecd | |
| parent | 183cbc087a7551e4335da212e93732a72a7570f0 (diff) | |
| download | VeraCrypt-77d070fe7384bfb0c6dece81e4900e603b13ee6c.tar.gz VeraCrypt-77d070fe7384bfb0c6dece81e4900e603b13ee6c.zip | |
Windows Bootloader: for MBR bootloader, reset position pointers to keystroke buffer after password or PIM is entered to avoid leaking length information
| -rw-r--r-- | src/Boot/Windows/BootConsoleIo.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/Boot/Windows/BootConsoleIo.cpp b/src/Boot/Windows/BootConsoleIo.cpp index 2fee84fc..60305ea1 100644 --- a/src/Boot/Windows/BootConsoleIo.cpp +++ b/src/Boot/Windows/BootConsoleIo.cpp @@ -299,6 +299,12 @@ void ClearBiosKeystrokeBuffer () mov cx, 32 cld rep stosb + + // reset position pointers at 0x41A and 0x41C to the begining + // of keyboard buffer to avoid revealing password/PIM length + mov ax, 0x001e + mov es:[0x41a], ax + mov es:[0x41c], ax pop es } } |