arno/linux-insides
1
0
Fork 0
mirror of https://github.com/0xAX/linux-insides.git synced 2025-01-03 12:20:56 +00:00
Code Issues Releases Wiki Activity

kaslr: update links

Browse Source
This commit is contained in:
Alexander Kuleshov 2018-04-04 00:21:02 +06:00
parent 9092a38671
commit 4d63511724
No known key found for this signature in database
GPG Key ID: EE88CAC52D66AC9B
1 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
Booting/linux-bootstrap-6.md
View File

@ -35,9 +35,9 @@ In the [previous part](https://github.com/0xAX/linux-insides/blob/master/Booting
```C
void choose_random_location(unsigned long input,
unsigned long input_size,
unsigned long *output,
unsigned long *output,
unsigned long output_size,
unsigned long *virt_addr)
unsigned long *virt_addr)
{}
```
@ -146,13 +146,13 @@ and the next step is the call of the:
initialize_identity_maps();
```
function which is defined in the [arch/x86/boot/compressed/pagetable.c](https://github.com/torvalds/linux/blob/master/arch/x86/boot/compressed/pagetable.c) source code file. This function starts from initialization of `mapping_info` an instance of the `x86_mapping_info` structure:
function which is defined in the [arch/x86/boot/compressed/kaslr_64.c](https://github.com/torvalds/linux/blob/master/arch/x86/boot/compressed/kaslr_64.c) source code file. This function starts from initialization of `mapping_info` an instance of the `x86_mapping_info` structure:
```C
mapping_info.alloc_pgt_page = alloc_pgt_page;
mapping_info.context = &pgt_data;
mapping_info.page_flag = __PAGE_KERNEL_LARGE_EXEC | sev_me_mask;
mapping_info.kernpg_flag = _KERNPG_TABLE | sev_me_mask;
mapping_info.kernpg_flag = _KERNPG_TABLE;
```
The `x86_mapping_info` structure is defined in the [arch/x86/include/asm/init.h](https://github.com/torvalds/linux/blob/master/arch/x86/include/asm/init.h) header file and looks:
@ -254,7 +254,7 @@ add_identity_map(mem_avoid[MEM_AVOID_ZO_RANGE].start,
mem_avoid[MEM_AVOID_ZO_RANGE].size);
```
At the beginning of the `mem_avoid_init` function tries to avoid memory region that is used for current kernel decompression. We fill an entry from the `mem_avoid` array with the start and size of such region and call the `add_identity_map` function which should build identity mapped pages for this region. The `add_identity_map` function is defined in the [arch/x86/boot/compressed/kaslr.c](https://github.com/torvalds/linux/blob/master/arch/x86/boot/compressed/kaslr.c) source code file and looks:
At the beginning of the `mem_avoid_init` function tries to avoid memory region that is used for current kernel decompression. We fill an entry from the `mem_avoid` array with the start and size of such region and call the `add_identity_map` function which should build identity mapped pages for this region. The `add_identity_map` function is defined in the [arch/x86/boot/compressed/kaslr_64.c](https://github.com/torvalds/linux/blob/master/arch/x86/boot/compressed/kaslr_64.c) source code file and looks:
```C
void add_identity_map(unsigned long start, unsigned long size)