diff options
| author | Jason Cooper <jason@lakedaemon.net> | 2016-10-11 23:53:56 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-12 01:06:32 +0300 |
| commit | 9c6f0902a55226b08b9703408f04b258b9afa0bc (patch) | |
| tree | 49d7c8d8f3e1e058c7436b2d21d0430623bca186 /arch/x86/kernel/sys_x86_64.c | |
| parent | 99fdafdeacfa99ca9047641b684fa2aaf094a661 (diff) | |
| download | linux-9c6f0902a55226b08b9703408f04b258b9afa0bc.tar.xz | |
x86: use simpler API for random address requests
Currently, all callers to randomize_range() set the length to 0 and
calculate end by adding a constant to the start address. We can simplify
the API to remove a bunch of needless checks and variables.
Use the new randomize_addr(start, range) call to set the requested
address.
Link: http://lkml.kernel.org/r/20160803233913.32511-3-jason@lakedaemon.net
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H . Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86/kernel/sys_x86_64.c')
| -rw-r--r-- | arch/x86/kernel/sys_x86_64.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/arch/x86/kernel/sys_x86_64.c b/arch/x86/kernel/sys_x86_64.c index 10e0272d789a..a55ed63b9f91 100644 --- a/arch/x86/kernel/sys_x86_64.c +++ b/arch/x86/kernel/sys_x86_64.c @@ -101,7 +101,6 @@ static void find_start_end(unsigned long flags, unsigned long *begin, unsigned long *end) { if (!test_thread_flag(TIF_ADDR32) && (flags & MAP_32BIT)) { - unsigned long new_begin; /* This is usually used needed to map code in small model, so it needs to be in the first 31bit. Limit it to that. This means we need to move the @@ -112,9 +111,7 @@ static void find_start_end(unsigned long flags, unsigned long *begin, *begin = 0x40000000; *end = 0x80000000; if (current->flags & PF_RANDOMIZE) { - new_begin = randomize_range(*begin, *begin + 0x02000000, 0); - if (new_begin) - *begin = new_begin; + *begin = randomize_page(*begin, 0x02000000); } } else { *begin = current->mm->mmap_legacy_base; |