1 files changed, 13 insertions, 153 deletions

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index d3023df8477f..dfd60192bc2e 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -120,147 +120,6 @@ long long simple_strtoll(const char *cp, char **endp, unsigned int base)
 }
 EXPORT_SYMBOL(simple_strtoll);
 
-/**
- * strict_strtoul - convert a string to an unsigned long strictly
- * @cp: The string to be converted
- * @base: The number base to use
- * @res: The converted result value
- *
- * strict_strtoul converts a string to an unsigned long only if the
- * string is really an unsigned long string, any string containing
- * any invalid char at the tail will be rejected and -EINVAL is returned,
- * only a newline char at the tail is acceptible because people generally
- * change a module parameter in the following way:
- *
- *      echo 1024 > /sys/module/e1000/parameters/copybreak
- *
- * echo will append a newline to the tail.
- *
- * It returns 0 if conversion is successful and *res is set to the converted
- * value, otherwise it returns -EINVAL and *res is set to 0.
- *
- * simple_strtoul just ignores the successive invalid characters and
- * return the converted value of prefix part of the string.
- */
-int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
-{
-        char *tail;
-        unsigned long val;
-
-        *res = 0;
-        if (!*cp)
-                return -EINVAL;
-
-        val = simple_strtoul(cp, &tail, base);
-        if (tail == cp)
-                return -EINVAL;
-
-        if ((tail[0] == '\0') || (tail[0] == '\n' && tail[1] == '\0')) {
-                *res = val;
-                return 0;
-        }
-
-        return -EINVAL;
-}
-EXPORT_SYMBOL(strict_strtoul);
-
-/**
- * strict_strtol - convert a string to a long strictly
- * @cp: The string to be converted
- * @base: The number base to use
- * @res: The converted result value
- *
- * strict_strtol is similiar to strict_strtoul, but it allows the first
- * character of a string is '-'.
- *
- * It returns 0 if conversion is successful and *res is set to the converted
- * value, otherwise it returns -EINVAL and *res is set to 0.
- */
-int strict_strtol(const char *cp, unsigned int base, long *res)
-{
-        int ret;
-        if (*cp == '-') {
-                ret = strict_strtoul(cp + 1, base, (unsigned long *)res);
-                if (!ret)
-                        *res = -(*res);
-        } else {
-                ret = strict_strtoul(cp, base, (unsigned long *)res);
-        }
-
-        return ret;
-}
-EXPORT_SYMBOL(strict_strtol);
-
-/**
- * strict_strtoull - convert a string to an unsigned long long strictly
- * @cp: The string to be converted
- * @base: The number base to use
- * @res: The converted result value
- *
- * strict_strtoull converts a string to an unsigned long long only if the
- * string is really an unsigned long long string, any string containing
- * any invalid char at the tail will be rejected and -EINVAL is returned,
- * only a newline char at the tail is acceptible because people generally
- * change a module parameter in the following way:
- *
- *      echo 1024 > /sys/module/e1000/parameters/copybreak
- *
- * echo will append a newline to the tail of the string.
- *
- * It returns 0 if conversion is successful and *res is set to the converted
- * value, otherwise it returns -EINVAL and *res is set to 0.
- *
- * simple_strtoull just ignores the successive invalid characters and
- * return the converted value of prefix part of the string.
- */
-int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res)
-{
-        char *tail;
-        unsigned long long val;
-
-        *res = 0;
-        if (!*cp)
-                return -EINVAL;
-
-        val = simple_strtoull(cp, &tail, base);
-        if (tail == cp)
-                return -EINVAL;
-        if ((tail[0] == '\0') || (tail[0] == '\n' && tail[1] == '\0')) {
-                *res = val;
-                return 0;
-        }
-
-        return -EINVAL;
-}
-EXPORT_SYMBOL(strict_strtoull);
-
-/**
- * strict_strtoll - convert a string to a long long strictly
- * @cp: The string to be converted
- * @base: The number base to use
- * @res: The converted result value
- *
- * strict_strtoll is similiar to strict_strtoull, but it allows the first
- * character of a string is '-'.
- *
- * It returns 0 if conversion is successful and *res is set to the converted
- * value, otherwise it returns -EINVAL and *res is set to 0.
- */
-int strict_strtoll(const char *cp, unsigned int base, long long *res)
-{
-        int ret;
-        if (*cp == '-') {
-                ret = strict_strtoull(cp + 1, base, (unsigned long long *)res);
-                if (!ret)
-                        *res = -(*res);
-        } else {
-                ret = strict_strtoull(cp, base, (unsigned long long *)res);
-        }
-
-        return ret;
-}
-EXPORT_SYMBOL(strict_strtoll);
-
 static noinline_for_stack
 int skip_atoi(const char **s)
 {
@@ -574,7 +433,9 @@ char *symbol_string(char *buf, char *end, void *ptr,
         unsigned long value = (unsigned long) ptr;
 #ifdef CONFIG_KALLSYMS
         char sym[KSYM_SYMBOL_LEN];
-        if (ext != 'f' && ext != 's')
+        if (ext == 'B')
+                sprint_backtrace(sym, value);
+        else if (ext != 'f' && ext != 's')
                 sprint_symbol(sym, value);
         else
                 kallsyms_lookup(value, NULL, NULL, NULL, sym);
@@ -936,7 +797,7 @@ char *uuid_string(char *buf, char *end, const u8 *addr,
         return string(buf, end, uuid, spec);
 }
 
-int kptr_restrict = 1;
+int kptr_restrict __read_mostly;
 
 /*
  * Show a '%p' thing.  A kernel extension is that the '%p' is followed
@@ -949,6 +810,7 @@ int kptr_restrict = 1;
  * - 'f' For simple symbolic function names without offset
  * - 'S' For symbolic direct pointers with offset
  * - 's' For symbolic direct pointers without offset
+ * - 'B' For backtraced symbolic direct pointers with offset
  * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
  * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
  * - 'M' For a 6-byte MAC address, it prints the address in the
@@ -991,7 +853,7 @@ static noinline_for_stack
 char *pointer(const char *fmt, char *buf, char *end, void *ptr,
               struct printf_spec spec)
 {
-        if (!ptr) {
+        if (!ptr && *fmt != 'K') {
                 /*
                  * Print (null) with the same width as a pointer so it makes
                  * tabular output look nice.
@@ -1008,6 +870,7 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
                 /* Fallthrough */
         case 'S':
         case 's':
+        case 'B':
                 return symbol_string(buf, end, ptr, spec, *fmt);
         case 'R':
         case 'r':
@@ -1047,16 +910,12 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
                         if (spec.field_width == -1)
                                 spec.field_width = 2 * sizeof(void *);
                         return string(buf, end, "pK-error", spec);
-                } else if ((kptr_restrict == 0) ||
-                         (kptr_restrict == 1 &&
-                          has_capability_noaudit(current, CAP_SYSLOG)))
-                        break;
-
-                if (spec.field_width == -1) {
-                        spec.field_width = 2 * sizeof(void *);
-                        spec.flags |= ZEROPAD;
                 }
-                return number(buf, end, 0, spec);
+                if (!((kptr_restrict == 0) ||
+                      (kptr_restrict == 1 &&
+                       has_capability_noaudit(current, CAP_SYSLOG))))
+                        ptr = NULL;
+                break;
         }
         spec.flags |= SMALL;
         if (spec.field_width == -1) {
@@ -1279,6 +1138,7 @@ qualifier:
  * %ps output the name of a text symbol without offset
  * %pF output the name of a function pointer with its offset
  * %pf output the name of a function pointer without its offset
+ * %pB output the name of a backtrace symbol with its offset
  * %pR output the address range in a struct resource with decoded flags
  * %pr output the address range in a struct resource with raw flags
  * %pM output a 6-byte MAC address with colons