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x86: MMU: Bug in _x86_mmu_buffer_validate

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The value of the PTE (starting_pte_num) was not
calulated correctly. If size of the buffer exceeded 4KB,
the buffer validation API was failing.

JIRA: ZEP-2489

Signed-off-by: Adithya Baglody <adithya.nagaraj.baglody@intel.com>
This commit is contained in:
Adithya Baglody 2017-08-09 12:23:00 +05:30 • committed by Andrew Boie
commit ab7b02ce67
1 changed files with 1 additions and 1 deletions
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2
arch/x86/core/x86_mmu.c
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@ -143,7 +143,7 @@ int _x86_mmu_buffer_validate(void *addr, size_t size, int flags)
end_pde_num = MMU_PDE_NUM((char *)addr + size - 1);
rw_permission = GET_RW_PERM(flags);
us_permission = GET_US_PERM(flags);
starting_pte_num = MMU_PAGE_NUM((char *)addr + size - 1);
starting_pte_num = MMU_PAGE_NUM((char *)addr);
/* Iterate for all the pde's the buffer might take up.
* (depends on the size of the buffer and start address of the buff)