Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6.24
* git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6.24:
sh: Force __access_ok() to obey address space limit.
sh: Fix argument page dcache flushing regression.
+6
include/asm-sh/cacheflush.h
+6
include/asm-sh/cacheflush.h
···
43
extern void __flush_invalidate_region(void *start, int size);
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#endif
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+
#define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
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+
static inline void flush_kernel_dcache_page(struct page *page)
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+
{
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flush_dcache_page(page);
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+
}
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+
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#if defined(CONFIG_CPU_SH4) && !defined(CONFIG_CACHE_OFF)
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extern void copy_to_user_page(struct vm_area_struct *vma,
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struct page *page, unsigned long vaddr, void *dst, const void *src,
+14
-26
include/asm-sh/uaccess.h
+14
-26
include/asm-sh/uaccess.h
···
73
/*
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* __access_ok: Check if address with size is OK or not.
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*
76
-
* We do three checks:
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* (1) is it user space?
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* (2) addr + size --> carry?
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* (3) addr + size >= 0x80000000 (PAGE_OFFSET)
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*
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-
* (1) (2) (3) | RESULT
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* 0 0 0 | ok
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* 0 0 1 | ok
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* 0 1 0 | bad
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* 0 1 1 | bad
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* 1 0 0 | ok
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* 1 0 1 | bad
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* 1 1 0 | bad
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* 1 1 1 | bad
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*/
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static inline int __access_ok(unsigned long addr, unsigned long size)
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{
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-
unsigned long flag, tmp;
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__asm__("stc r7_bank, %0\n\t"
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-
"mov.l @(8,%0), %0\n\t"
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-
"clrt\n\t"
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-
"addc %2, %1\n\t"
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-
"and %1, %0\n\t"
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"rotcl %0\n\t"
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"rotcl %0\n\t"
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"and #3, %0"
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: "=&z" (flag), "=r" (tmp)
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: "r" (addr), "1" (size)
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: "t");
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-
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return flag == 0;
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}
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#endif /* CONFIG_MMU */
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···
73
/*
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* __access_ok: Check if address with size is OK or not.
75
*
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+
* Uhhuh, this needs 33-bit arithmetic. We have a carry..
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*
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+
* sum := addr + size; carry? --> flag = true;
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+
* if (sum >= addr_limit) flag = true;
80
*/
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static inline int __access_ok(unsigned long addr, unsigned long size)
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{
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+
unsigned long flag, sum;
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__asm__("clrt\n\t"
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"addc %3, %1\n\t"
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"movt %0\n\t"
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"cmp/hi %4, %1\n\t"
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+
"rotcl %0"
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:"=&r" (flag), "=r" (sum)
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:"1" (addr), "r" (size),
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"r" (current_thread_info()->addr_limit.seg)
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+
:"t");
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return flag == 0;
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+
96
}
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#endif /* CONFIG_MMU */
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