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Subject[PATCH v5 01/11] vsprintf: Shuffle misc pointer to string functions
Date
This is just a preparation step for further changes.

The patch does not change the code.

Signed-off-by: Petr Mladek <pmladek@suse.com>
---
lib/vsprintf.c | 244 ++++++++++++++++++++++++++++-----------------------------
1 file changed, 122 insertions(+), 122 deletions(-)

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index b82f0c6c2aec..19fdfe621b40 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -613,6 +613,128 @@ char *string(char *buf, char *end, const char *s, struct printf_spec spec)
}

static noinline_for_stack
+char *pointer_string(char *buf, char *end, const void *ptr,
+ struct printf_spec spec)
+{
+ spec.base = 16;
+ spec.flags |= SMALL;
+ if (spec.field_width == -1) {
+ spec.field_width = 2 * sizeof(ptr);
+ spec.flags |= ZEROPAD;
+ }
+
+ return number(buf, end, (unsigned long int)ptr, spec);
+}
+
+static bool have_filled_random_ptr_key __read_mostly;
+static siphash_key_t ptr_key __read_mostly;
+
+static void fill_random_ptr_key(struct random_ready_callback *unused)
+{
+ get_random_bytes(&ptr_key, sizeof(ptr_key));
+ /*
+ * have_filled_random_ptr_key==true is dependent on get_random_bytes().
+ * ptr_to_id() needs to see have_filled_random_ptr_key==true
+ * after get_random_bytes() returns.
+ */
+ smp_mb();
+ WRITE_ONCE(have_filled_random_ptr_key, true);
+}
+
+static struct random_ready_callback random_ready = {
+ .func = fill_random_ptr_key
+};
+
+static int __init initialize_ptr_random(void)
+{
+ int ret = add_random_ready_callback(&random_ready);
+
+ if (!ret) {
+ return 0;
+ } else if (ret == -EALREADY) {
+ fill_random_ptr_key(&random_ready);
+ return 0;
+ }
+
+ return ret;
+}
+early_initcall(initialize_ptr_random);
+
+/* Maps a pointer to a 32 bit unique identifier. */
+static char *ptr_to_id(char *buf, char *end, void *ptr, struct printf_spec spec)
+{
+ const char *str = sizeof(ptr) == 8 ? "(____ptrval____)" : "(ptrval)";
+ unsigned long hashval;
+
+ if (unlikely(!have_filled_random_ptr_key)) {
+ spec.field_width = 2 * sizeof(ptr);
+ /* string length must be less than default_width */
+ return string(buf, end, str, spec);
+ }
+
+#ifdef CONFIG_64BIT
+ hashval = (unsigned long)siphash_1u64((u64)ptr, &ptr_key);
+ /*
+ * Mask off the first 32 bits, this makes explicit that we have
+ * modified the address (and 32 bits is plenty for a unique ID).
+ */
+ hashval = hashval & 0xffffffff;
+#else
+ hashval = (unsigned long)siphash_1u32((u32)ptr, &ptr_key);
+#endif
+ return pointer_string(buf, end, (const void *)hashval, spec);
+}
+
+int kptr_restrict __read_mostly;
+
+static noinline_for_stack
+char *restricted_pointer(char *buf, char *end, const void *ptr,
+ struct printf_spec spec)
+{
+ switch (kptr_restrict) {
+ case 0:
+ /* Always print %pK values */
+ break;
+ case 1: {
+ const struct cred *cred;
+
+ /*
+ * kptr_restrict==1 cannot be used in IRQ context
+ * because its test for CAP_SYSLOG would be meaningless.
+ */
+ if (in_irq() || in_serving_softirq() || in_nmi()) {
+ if (spec.field_width == -1)
+ spec.field_width = 2 * sizeof(ptr);
+ return string(buf, end, "pK-error", spec);
+ }
+
+ /*
+ * Only print the real pointer value if the current
+ * process has CAP_SYSLOG and is running with the
+ * same credentials it started with. This is because
+ * access to files is checked at open() time, but %pK
+ * checks permission at read() time. We don't want to
+ * leak pointer values if a binary opens a file using
+ * %pK and then elevates privileges before reading it.
+ */
+ cred = current_cred();
+ if (!has_capability_noaudit(current, CAP_SYSLOG) ||
+ !uid_eq(cred->euid, cred->uid) ||
+ !gid_eq(cred->egid, cred->gid))
+ ptr = NULL;
+ break;
+ }
+ case 2:
+ default:
+ /* Always print 0's for %pK */
+ ptr = NULL;
+ break;
+ }
+
+ return pointer_string(buf, end, ptr, spec);
+}
+
+static noinline_for_stack
char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec,
const char *fmt)
{
@@ -1358,69 +1480,6 @@ char *uuid_string(char *buf, char *end, const u8 *addr,
}

static noinline_for_stack
-char *pointer_string(char *buf, char *end, const void *ptr,
- struct printf_spec spec)
-{
- spec.base = 16;
- spec.flags |= SMALL;
- if (spec.field_width == -1) {
- spec.field_width = 2 * sizeof(ptr);
- spec.flags |= ZEROPAD;
- }
-
- return number(buf, end, (unsigned long int)ptr, spec);
-}
-
-int kptr_restrict __read_mostly;
-
-static noinline_for_stack
-char *restricted_pointer(char *buf, char *end, const void *ptr,
- struct printf_spec spec)
-{
- switch (kptr_restrict) {
- case 0:
- /* Always print %pK values */
- break;
- case 1: {
- const struct cred *cred;
-
- /*
- * kptr_restrict==1 cannot be used in IRQ context
- * because its test for CAP_SYSLOG would be meaningless.
- */
- if (in_irq() || in_serving_softirq() || in_nmi()) {
- if (spec.field_width == -1)
- spec.field_width = 2 * sizeof(ptr);
- return string(buf, end, "pK-error", spec);
- }
-
- /*
- * Only print the real pointer value if the current
- * process has CAP_SYSLOG and is running with the
- * same credentials it started with. This is because
- * access to files is checked at open() time, but %pK
- * checks permission at read() time. We don't want to
- * leak pointer values if a binary opens a file using
- * %pK and then elevates privileges before reading it.
- */
- cred = current_cred();
- if (!has_capability_noaudit(current, CAP_SYSLOG) ||
- !uid_eq(cred->euid, cred->uid) ||
- !gid_eq(cred->egid, cred->gid))
- ptr = NULL;
- break;
- }
- case 2:
- default:
- /* Always print 0's for %pK */
- ptr = NULL;
- break;
- }
-
- return pointer_string(buf, end, ptr, spec);
-}
-
-static noinline_for_stack
char *netdev_bits(char *buf, char *end, const void *addr, const char *fmt)
{
unsigned long long num;
@@ -1654,65 +1713,6 @@ char *device_node_string(char *buf, char *end, struct device_node *dn,
return widen_string(buf, buf - buf_start, end, spec);
}

-static bool have_filled_random_ptr_key __read_mostly;
-static siphash_key_t ptr_key __read_mostly;
-
-static void fill_random_ptr_key(struct random_ready_callback *unused)
-{
- get_random_bytes(&ptr_key, sizeof(ptr_key));
- /*
- * have_filled_random_ptr_key==true is dependent on get_random_bytes().
- * ptr_to_id() needs to see have_filled_random_ptr_key==true
- * after get_random_bytes() returns.
- */
- smp_mb();
- WRITE_ONCE(have_filled_random_ptr_key, true);
-}
-
-static struct random_ready_callback random_ready = {
- .func = fill_random_ptr_key
-};
-
-static int __init initialize_ptr_random(void)
-{
- int ret = add_random_ready_callback(&random_ready);
-
- if (!ret) {
- return 0;
- } else if (ret == -EALREADY) {
- fill_random_ptr_key(&random_ready);
- return 0;
- }
-
- return ret;
-}
-early_initcall(initialize_ptr_random);
-
-/* Maps a pointer to a 32 bit unique identifier. */
-static char *ptr_to_id(char *buf, char *end, void *ptr, struct printf_spec spec)
-{
- const char *str = sizeof(ptr) == 8 ? "(____ptrval____)" : "(ptrval)";
- unsigned long hashval;
-
- if (unlikely(!have_filled_random_ptr_key)) {
- spec.field_width = 2 * sizeof(ptr);
- /* string length must be less than default_width */
- return string(buf, end, str, spec);
- }
-
-#ifdef CONFIG_64BIT
- hashval = (unsigned long)siphash_1u64((u64)ptr, &ptr_key);
- /*
- * Mask off the first 32 bits, this makes explicit that we have
- * modified the address (and 32 bits is plenty for a unique ID).
- */
- hashval = hashval & 0xffffffff;
-#else
- hashval = (unsigned long)siphash_1u32((u32)ptr, &ptr_key);
-#endif
- return pointer_string(buf, end, (const void *)hashval, spec);
-}
-
/*
* Show a '%p' thing. A kernel extension is that the '%p' is followed
* by an extra set of alphanumeric characters that are extended format
--
2.13.6
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