vsprintf.c (f43dc23d5ea91fca257be02138a255f02d98e806) vsprintf.c (455cd5ab305c90ffc422dd2e0fb634730942b257)
1/*
2 * linux/lib/vsprintf.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7/* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
8/*

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931 do {
932 *p = toupper(*p);
933 } while (*(++p));
934 }
935
936 return string(buf, end, uuid, spec);
937}
938
1/*
2 * linux/lib/vsprintf.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7/* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
8/*

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931 do {
932 *p = toupper(*p);
933 } while (*(++p));
934 }
935
936 return string(buf, end, uuid, spec);
937}
938
939int kptr_restrict = 1;
940
939/*
940 * Show a '%p' thing. A kernel extension is that the '%p' is followed
941 * by an extra set of alphanumeric characters that are extended format
942 * specifiers.
943 *
944 * Right now we handle:
945 *
946 * - 'F' For symbolic function descriptor pointers with offset

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974 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
975 * little endian output byte order is:
976 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
977 * - 'V' For a struct va_format which contains a format string * and va_list *,
978 * call vsnprintf(->format, *->va_list).
979 * Implements a "recursive vsnprintf".
980 * Do not use this feature without some mechanism to verify the
981 * correctness of the format string and va_list arguments.
941/*
942 * Show a '%p' thing. A kernel extension is that the '%p' is followed
943 * by an extra set of alphanumeric characters that are extended format
944 * specifiers.
945 *
946 * Right now we handle:
947 *
948 * - 'F' For symbolic function descriptor pointers with offset

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976 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
977 * little endian output byte order is:
978 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
979 * - 'V' For a struct va_format which contains a format string * and va_list *,
980 * call vsnprintf(->format, *->va_list).
981 * Implements a "recursive vsnprintf".
982 * Do not use this feature without some mechanism to verify the
983 * correctness of the format string and va_list arguments.
984 * - 'K' For a kernel pointer that should be hidden from unprivileged users
982 *
983 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
984 * function pointers are really function descriptors, which contain a
985 * pointer to the real address.
986 */
987static noinline_for_stack
988char *pointer(const char *fmt, char *buf, char *end, void *ptr,
989 struct printf_spec spec)

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1030 }
1031 break;
1032 case 'U':
1033 return uuid_string(buf, end, ptr, spec, fmt);
1034 case 'V':
1035 return buf + vsnprintf(buf, end - buf,
1036 ((struct va_format *)ptr)->fmt,
1037 *(((struct va_format *)ptr)->va));
985 *
986 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
987 * function pointers are really function descriptors, which contain a
988 * pointer to the real address.
989 */
990static noinline_for_stack
991char *pointer(const char *fmt, char *buf, char *end, void *ptr,
992 struct printf_spec spec)

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1033 }
1034 break;
1035 case 'U':
1036 return uuid_string(buf, end, ptr, spec, fmt);
1037 case 'V':
1038 return buf + vsnprintf(buf, end - buf,
1039 ((struct va_format *)ptr)->fmt,
1040 *(((struct va_format *)ptr)->va));
1041 case 'K':
1042 /*
1043 * %pK cannot be used in IRQ context because its test
1044 * for CAP_SYSLOG would be meaningless.
1045 */
1046 if (in_irq() || in_serving_softirq() || in_nmi()) {
1047 if (spec.field_width == -1)
1048 spec.field_width = 2 * sizeof(void *);
1049 return string(buf, end, "pK-error", spec);
1050 } else if ((kptr_restrict == 0) ||
1051 (kptr_restrict == 1 &&
1052 has_capability_noaudit(current, CAP_SYSLOG)))
1053 break;
1054
1055 if (spec.field_width == -1) {
1056 spec.field_width = 2 * sizeof(void *);
1057 spec.flags |= ZEROPAD;
1058 }
1059 return number(buf, end, 0, spec);
1038 }
1039 spec.flags |= SMALL;
1040 if (spec.field_width == -1) {
1041 spec.field_width = 2 * sizeof(void *);
1042 spec.flags |= ZEROPAD;
1043 }
1044 spec.base = 16;
1045

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1061 spec.flags |= SMALL;
1062 if (spec.field_width == -1) {
1063 spec.field_width = 2 * sizeof(void *);
1064 spec.flags |= ZEROPAD;
1065 }
1066 spec.base = 16;
1067

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