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ANDROID: 16K: __PAGE_ALIGN randomize_stack_top() address

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In page-compat mode, align the randomized stack by the emulated
page-size.

Bug: 383389337
Bug: 315325080
Bug: 302403436
Change-Id: If0d5ab3b996dfe934d0b5b701c16e8c2b1dcc910
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
This commit is contained in:
Kalesh Singh
2023-11-10 00:11:04 -08:00
committed by Carlos Llamas
parent 9ba9a0891b
commit ba166bce2c
1 changed files with 3 additions and 3 deletions
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mm/util.c
+3 -3
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@@ -361,12 +361,12 @@ unsigned long randomize_stack_top(unsigned long stack_top)
if (current->flags & PF_RANDOMIZE) { if (current->flags & PF_RANDOMIZE) {
random_variable = get_random_long(); random_variable = get_random_long();
random_variable &= STACK_RND_MASK; random_variable &= STACK_RND_MASK;
random_variable <<= PAGE_SHIFT; random_variable <<= __PAGE_SHIFT;
} }
#ifdef CONFIG_STACK_GROWSUP #ifdef CONFIG_STACK_GROWSUP
return PAGE_ALIGN(stack_top) + random_variable; return __PAGE_ALIGN(stack_top) + random_variable;
#else #else
return PAGE_ALIGN(stack_top) - random_variable; return __PAGE_ALIGN(stack_top) - random_variable;
#endif #endif
} }