validate_prctl_map

Name:Check arithmetic relations of passed addresses.* WARNING: we don't require any capability here so be very careful* in what is allowed for modification from userspace.

Proto:static int validate_prctl_map_addr(struct prctl_mm_map *prctl_map)

Type:int

Parameter:

Type	Parameter	Name
struct prctl_mm_map *	prctl_map

1884

mmap_max_addr = TASK_SIZE

1885

error = -EINVAL

1887

static const unsigned char offsets[] = {offsetof(structprctl_mm_map, start_code), offsetof(structprctl_mm_map, end_code), offsetof(structprctl_mm_map, start_data), offsetof(structprctl_mm_map, end_data), offsetof(structprctl_mm_map, start_brk), offsetof(structprctl_mm_map, brk), offsetof(structprctl_mm_map, start_stack), offsetof(structprctl_mm_map, arg_start), offsetof(structprctl_mm_map, arg_end), offsetof(structprctl_mm_map, env_start), offsetof(structprctl_mm_map, env_end), }

1905

When i < ARRAY_SIZE - get the number of elements in array @arr*@arr: array to be sized(offsets) cycle

1906

val = *(prctl_map + offsets[i])

1908

If val >= mmap_max_addr || val < mmap_min_addr Then Go to out

1919

error = Make sure the pairs are ordered.(start_code, < , end_code)

1920

error |= Make sure the pairs are ordered.(start_data, <= , end_data)

1921

error |= Make sure the pairs are ordered.(start_brk, <= , brk)

1922

error |= Make sure the pairs are ordered.(arg_start, <= , arg_end)

1923

error |= Make sure the pairs are ordered.(env_start, <= , env_end)

1924

If error Then Go to out

1928

error = -EINVAL

1933

If heap for brk() syscall <= end_data || brk <= end_data Then Go to out

1940

If check_data_rlimit(rlimit(RLIMIT_DATA), brk, heap for brk() syscall , end_data, data section bounds ) Then Go to out

1945

error = 0

1946

out :

1947

Return error

**Caller**
Name	Describe
prctl_set_mm

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Function report