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| author | Kees Cook <[email protected]> | 2024-02-16 22:25:43 -0800 |
|---|---|---|
| committer | Thomas Gleixner <[email protected]> | 2024-02-27 00:23:55 +0100 |
| commit | 44c76825d6eefee9eb7ce06c38e1a6632ac7eb7d (patch) | |
| tree | 9df5154fb922c2d63d695be90c83ec5f7bc0052d /lib/test_fortify/write_overflow-strncpy-src.c | |
| 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: [email protected]
Signed-off-by: Kees Cook <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Jiri Kosina <[email protected]>
Closes: https://lore.kernel.org/linux-hardening/CA+2EKTVLvc8hDZc+2Yhwmus=dzOUG5E4gV7ayCbu0MPJTZzWkw@mail.gmail.com/
Link: https://lore.kernel.org/r/[email protected]
Diffstat (limited to 'lib/test_fortify/write_overflow-strncpy-src.c')
0 files changed, 0 insertions, 0 deletions