函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\kasan\init.c Create Date:2022-07-27 17:25:52
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：kasan_populate_early_shadow - populate shadow memory region with* kasan_early_shadow_page*@shadow_start - start of the memory range to populate*@shadow_end - end of the memory range to populate

函数原型：int __ref kasan_populate_early_shadow(const void *shadow_start, const void *shadow_end)

返回类型：int

参数：

类型参数名称
const void *shadow_start
const void *shadow_end
233  addr等于shadow_start
234  end等于shadow_end
235  pgd等于a shortcut which implies the use of the kernel's pgd, instead* of a process's(addr)
238  循环
239  next等于When walking page tables, get the address of the next boundary,* or the end address of the range if that comes earlier. Although no* vma end wraps to 0, rounded up __boundary may wrap to 0 throughout.(addr, end)
241  如果IS_ALIGNED(addr, PGDIR_SIZE)且end减addr大于等于PGDIR_SIZE则
264  pgd_populate( & For dynamically allocated mm_structs, there is a dynamically sized cpumask* at the end of the structure, the size of which depends on the maximum CPU* number the system can see, pgd, lm_alias(kasan_early_shadow_p4d))
267  p4d等于p4d_offset(pgd, addr)
268  p4d_populate( & For dynamically allocated mm_structs, there is a dynamically sized cpumask* at the end of the structure, the size of which depends on the maximum CPU* number the system can see, p4d, lm_alias(kasan_early_shadow_pud))
270  pud等于pud_offset(p4d, addr)
271  pud_populate( & For dynamically allocated mm_structs, there is a dynamically sized cpumask* at the end of the structure, the size of which depends on the maximum CPU* number the system can see, pud, lm_alias(kasan_early_shadow_pmd))
273  pmd等于pmd_offset(pud, addr)
274  pmd_populate_kernel( & For dynamically allocated mm_structs, there is a dynamically sized cpumask* at the end of the structure, the size of which depends on the maximum CPU* number the system can see, pmd, lm_alias(kasan_early_shadow_pte))
276  继续下一循环
279  如果The "pgd_xxx()" functions here are trivial for a folded two-level* setup: the p4d is never bad, and a p4d always exists (as it's folded* into the pgd entry)则
282  如果slab_is_available()则
286  否则
291  zero_p4d_populate(pgd, addr, next)
292  当pgd自加, addr等于next, addr不等于end循环
294  返回:0
调用者
名称描述
kasan_add_zero_shadow