| 1 |
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| 2 | #ifndef __TRACE_PROBE_KERNEL_H_
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| 3 | #define __TRACE_PROBE_KERNEL_H_
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| 4 |
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| 5 | |
| 6 | * This depends on trace_probe.h, but can not include it due to
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| 7 | * the way trace_probe_tmpl.h is used by trace_kprobe.c and trace_eprobe.c.
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| 8 | * Which means that any other user must include trace_probe.h before including
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| 9 | * this file.
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| 10 |
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| 11 |
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| 12 | static nokprobe_inline int
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| 13 | fetch_store_strlen_user(unsigned long addr)
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| 14 | {
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| 15 | const void __user *uaddr = (__force const void __user *)addr;
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| 16 |
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| 17 | return strnlen_user_nofault(uaddr, MAX_STRING_SIZE);
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| 18 | }
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| 19 |
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| 20 |
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| 21 | static nokprobe_inline int
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| 22 | fetch_store_strlen(unsigned long addr)
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| 23 | {
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| 24 | int ret, len = 0;
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| 25 | u8 c;
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| 26 |
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| 27 | #ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
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| 28 | if (addr < TASK_SIZE)
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| 29 | return fetch_store_strlen_user(addr);
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| 30 | #endif
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| 31 |
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| 32 | do {
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| 33 | ret = copy_from_kernel_nofault(&c, (u8 *)addr + len, 1);
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| 34 | len++;
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| 35 | } while (c && ret == 0 && len < MAX_STRING_SIZE);
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| 36 |
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| 37 | return (ret < 0) ? ret : len;
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| 38 | }
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| 39 |
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| 40 | static nokprobe_inline void set_data_loc(int ret, void *dest, void *__dest, void *base)
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| 41 | {
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| 42 | if (ret < 0)
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| 43 | ret = 0;
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| 44 | *(u32 *)dest = make_data_loc(ret, __dest - base);
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| 45 | }
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| 46 |
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| 47 | |
| 48 | * Fetch a null-terminated string from user. Caller MUST set *(u32 *)buf
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| 49 | * with max length and relative data location.
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| 50 |
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| 51 | static nokprobe_inline int
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| 52 | fetch_store_string_user(unsigned long addr, void *dest, void *base)
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| 53 | {
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| 54 | const void __user *uaddr = (__force const void __user *)addr;
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| 55 | int maxlen = get_loc_len(*(u32 *)dest);
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| 56 | void *__dest;
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| 57 | long ret;
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| 58 |
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| 59 | if (unlikely(!maxlen))
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| 60 | return -ENOMEM;
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| 61 |
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| 62 | __dest = get_loc_data(dest, base);
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| 63 |
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| 64 | ret = strncpy_from_user_nofault(__dest, uaddr, maxlen);
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| 65 | set_data_loc(ret, dest, __dest, base);
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| 66 |
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| 67 | return ret;
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| 68 | }
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| 69 |
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| 70 | |
| 71 | * Fetch a null-terminated string. Caller MUST set *(u32 *)buf with max
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| 72 | * length and relative data location.
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| 73 |
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| 74 | static nokprobe_inline int
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| 75 | fetch_store_string(unsigned long addr, void *dest, void *base)
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| 76 | {
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| 77 | int maxlen = get_loc_len(*(u32 *)dest);
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| 78 | void *__dest;
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| 79 | long ret;
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| 80 |
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| 81 | #ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
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| 82 | if ((unsigned long)addr < TASK_SIZE)
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| 83 | return fetch_store_string_user(addr, dest, base);
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| 84 | #endif
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| 85 |
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| 86 | if (unlikely(!maxlen))
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| 87 | return -ENOMEM;
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| 88 |
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| 89 | __dest = get_loc_data(dest, base);
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| 90 |
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| 91 | |
| 92 | * Try to get string again, since the string can be changed while
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| 93 | * probing.
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| 94 |
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| 95 | ret = strncpy_from_kernel_nofault(__dest, (void *)addr, maxlen);
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| 96 | set_data_loc(ret, dest, __dest, base);
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| 97 |
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| 98 | return ret;
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| 99 | }
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| 100 |
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| 101 | static nokprobe_inline int
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| 102 | probe_mem_read_user(void *dest, void *src, size_t size)
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| 103 | {
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| 104 | const void __user *uaddr = (__force const void __user *)src;
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| 105 |
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| 106 | return copy_from_user_nofault(dest, uaddr, size);
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| 107 | }
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| 108 |
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| 109 | static nokprobe_inline int
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| 110 | probe_mem_read(void *dest, void *src, size_t size)
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| 111 | {
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| 112 | #ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
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| 113 | if ((unsigned long)src < TASK_SIZE)
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| 114 | return probe_mem_read_user(dest, src, size);
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| 115 | #endif
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| 116 | return copy_from_kernel_nofault(dest, src, size);
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| 117 | }
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| 118 |
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| 119 | #endif
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