diff options
| author | Kees Cook <keescook@chromium.org> | 2024-02-16 22:25:43 -0800 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2024-02-27 00:23:55 +0100 |
| commit | 44c76825d6eefee9eb7ce06c38e1a6632ac7eb7d (patch) | |
| tree | 9df5154fb922c2d63d695be90c83ec5f7bc0052d /include/linux/compiler-gcc.h | |
| parent | 3c6539b4c177695aaa77893c4ce91d21dea7bb3d (diff) | |
x86: Increase brk randomness entropy for 64-bit systems
In commit c1d171a00294 ("x86: randomize brk"), arch_randomize_brk() was
defined to use a 32MB range (13 bits of entropy), but was never increased
when moving to 64-bit. The default arch_randomize_brk() uses 32MB for
32-bit tasks, and 1GB (18 bits of entropy) for 64-bit tasks.
Update x86_64 to match the entropy used by arm64 and other 64-bit
architectures.
Reported-by: y0un9n132@gmail.com
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Jiri Kosina <jkosina@suse.com>
Closes: https://lore.kernel.org/linux-hardening/CA+2EKTVLvc8hDZc+2Yhwmus=dzOUG5E4gV7ayCbu0MPJTZzWkw@mail.gmail.com/
Link: https://lore.kernel.org/r/20240217062545.1631668-1-keescook@chromium.org
Diffstat (limited to 'include/linux/compiler-gcc.h')
0 files changed, 0 insertions, 0 deletions