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-rw-r--r--lib/vsprintf.c226
1 files changed, 218 insertions, 8 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 0d62fd700f68..26559bdb4c49 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -26,6 +26,7 @@
#include <linux/math64.h>
#include <linux/uaccess.h>
#include <linux/ioport.h>
+#include <linux/dcache.h>
#include <net/addrconf.h>
#include <asm/page.h> /* for PAGE_SIZE */
@@ -532,16 +533,98 @@ char *string(char *buf, char *end, const char *s, struct printf_spec spec)
return buf;
}
+static void widen(char *buf, char *end, unsigned len, unsigned spaces)
+{
+ size_t size;
+ if (buf >= end) /* nowhere to put anything */
+ return;
+ size = end - buf;
+ if (size <= spaces) {
+ memset(buf, ' ', size);
+ return;
+ }
+ if (len) {
+ if (len > size - spaces)
+ len = size - spaces;
+ memmove(buf + spaces, buf, len);
+ }
+ memset(buf, ' ', spaces);
+}
+
+static noinline_for_stack
+char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec,
+ const char *fmt)
+{
+ const char *array[4], *s;
+ const struct dentry *p;
+ int depth;
+ int i, n;
+
+ switch (fmt[1]) {
+ case '2': case '3': case '4':
+ depth = fmt[1] - '0';
+ break;
+ default:
+ depth = 1;
+ }
+
+ rcu_read_lock();
+ for (i = 0; i < depth; i++, d = p) {
+ p = ACCESS_ONCE(d->d_parent);
+ array[i] = ACCESS_ONCE(d->d_name.name);
+ if (p == d) {
+ if (i)
+ array[i] = "";
+ i++;
+ break;
+ }
+ }
+ s = array[--i];
+ for (n = 0; n != spec.precision; n++, buf++) {
+ char c = *s++;
+ if (!c) {
+ if (!i)
+ break;
+ c = '/';
+ s = array[--i];
+ }
+ if (buf < end)
+ *buf = c;
+ }
+ rcu_read_unlock();
+ if (n < spec.field_width) {
+ /* we want to pad the sucker */
+ unsigned spaces = spec.field_width - n;
+ if (!(spec.flags & LEFT)) {
+ widen(buf - n, end, n, spaces);
+ return buf + spaces;
+ }
+ while (spaces--) {
+ if (buf < end)
+ *buf = ' ';
+ ++buf;
+ }
+ }
+ return buf;
+}
+
static noinline_for_stack
char *symbol_string(char *buf, char *end, void *ptr,
- struct printf_spec spec, char ext)
+ struct printf_spec spec, const char *fmt)
{
- unsigned long value = (unsigned long) ptr;
+ unsigned long value;
#ifdef CONFIG_KALLSYMS
char sym[KSYM_SYMBOL_LEN];
- if (ext == 'B')
+#endif
+
+ if (fmt[1] == 'R')
+ ptr = __builtin_extract_return_addr(ptr);
+ value = (unsigned long)ptr;
+
+#ifdef CONFIG_KALLSYMS
+ if (*fmt == 'B')
sprint_backtrace(sym, value);
- else if (ext != 'f' && ext != 's')
+ else if (*fmt != 'f' && *fmt != 's')
sprint_symbol(sym, value);
else
sprint_symbol_no_offset(sym, value);
@@ -663,7 +746,7 @@ static noinline_for_stack
char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
const char *fmt)
{
- int i, len = 1; /* if we pass '%ph[CDN]', field witdh remains
+ int i, len = 1; /* if we pass '%ph[CDN]', field width remains
negative value, fallback to the default */
char separator;
@@ -916,6 +999,103 @@ char *ip4_addr_string(char *buf, char *end, const u8 *addr,
}
static noinline_for_stack
+char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa,
+ struct printf_spec spec, const char *fmt)
+{
+ bool have_p = false, have_s = false, have_f = false, have_c = false;
+ char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") +
+ sizeof(":12345") + sizeof("/123456789") +
+ sizeof("%1234567890")];
+ char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr);
+ const u8 *addr = (const u8 *) &sa->sin6_addr;
+ char fmt6[2] = { fmt[0], '6' };
+ u8 off = 0;
+
+ fmt++;
+ while (isalpha(*++fmt)) {
+ switch (*fmt) {
+ case 'p':
+ have_p = true;
+ break;
+ case 'f':
+ have_f = true;
+ break;
+ case 's':
+ have_s = true;
+ break;
+ case 'c':
+ have_c = true;
+ break;
+ }
+ }
+
+ if (have_p || have_s || have_f) {
+ *p = '[';
+ off = 1;
+ }
+
+ if (fmt6[0] == 'I' && have_c)
+ p = ip6_compressed_string(ip6_addr + off, addr);
+ else
+ p = ip6_string(ip6_addr + off, addr, fmt6);
+
+ if (have_p || have_s || have_f)
+ *p++ = ']';
+
+ if (have_p) {
+ *p++ = ':';
+ p = number(p, pend, ntohs(sa->sin6_port), spec);
+ }
+ if (have_f) {
+ *p++ = '/';
+ p = number(p, pend, ntohl(sa->sin6_flowinfo &
+ IPV6_FLOWINFO_MASK), spec);
+ }
+ if (have_s) {
+ *p++ = '%';
+ p = number(p, pend, sa->sin6_scope_id, spec);
+ }
+ *p = '\0';
+
+ return string(buf, end, ip6_addr, spec);
+}
+
+static noinline_for_stack
+char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa,
+ struct printf_spec spec, const char *fmt)
+{
+ bool have_p = false;
+ char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")];
+ char *pend = ip4_addr + sizeof(ip4_addr);
+ const u8 *addr = (const u8 *) &sa->sin_addr.s_addr;
+ char fmt4[3] = { fmt[0], '4', 0 };
+
+ fmt++;
+ while (isalpha(*++fmt)) {
+ switch (*fmt) {
+ case 'p':
+ have_p = true;
+ break;
+ case 'h':
+ case 'l':
+ case 'n':
+ case 'b':
+ fmt4[2] = *fmt;
+ break;
+ }
+ }
+
+ p = ip4_string(ip4_addr, addr, fmt4);
+ if (have_p) {
+ *p++ = ':';
+ p = number(p, pend, ntohs(sa->sin_port), spec);
+ }
+ *p = '\0';
+
+ return string(buf, end, ip4_addr, spec);
+}
+
+static noinline_for_stack
char *uuid_string(char *buf, char *end, const u8 *addr,
struct printf_spec spec, const char *fmt)
{
@@ -987,6 +1167,7 @@ int kptr_restrict __read_mostly;
* - 'f' For simple symbolic function names without offset
* - 'S' For symbolic direct pointers with offset
* - 's' For symbolic direct pointers without offset
+ * - '[FfSs]R' as above with __builtin_extract_return_addr() translation
* - '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]
@@ -999,11 +1180,17 @@ int kptr_restrict __read_mostly;
* - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
* IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
* IPv6 uses colon separated network-order 16 bit hex with leading 0's
+ * [S][pfs]
+ * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
+ * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
* - 'i' [46] for 'raw' IPv4/IPv6 addresses
* IPv6 omits the colons (01020304...0f)
* IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
- * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order
- * - 'I6c' for IPv6 addresses printed as specified by
+ * [S][pfs]
+ * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
+ * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
+ * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order
+ * - 'I[6S]c' for IPv6 addresses printed as specified by
* http://tools.ietf.org/html/rfc5952
* - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
* "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
@@ -1060,7 +1247,7 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
case 'S':
case 's':
case 'B':
- return symbol_string(buf, end, ptr, spec, *fmt);
+ return symbol_string(buf, end, ptr, spec, fmt);
case 'R':
case 'r':
return resource_string(buf, end, ptr, spec, fmt);
@@ -1085,6 +1272,21 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
return ip6_addr_string(buf, end, ptr, spec, fmt);
case '4':
return ip4_addr_string(buf, end, ptr, spec, fmt);
+ case 'S': {
+ const union {
+ struct sockaddr raw;
+ struct sockaddr_in v4;
+ struct sockaddr_in6 v6;
+ } *sa = ptr;
+
+ switch (sa->raw.sa_family) {
+ case AF_INET:
+ return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt);
+ case AF_INET6:
+ return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt);
+ default:
+ return string(buf, end, "(invalid address)", spec);
+ }}
}
break;
case 'U':
@@ -1127,6 +1329,12 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
spec.base = 16;
return number(buf, end,
(unsigned long long) *((phys_addr_t *)ptr), spec);
+ case 'd':
+ return dentry_name(buf, end, ptr, spec, fmt);
+ case 'D':
+ return dentry_name(buf, end,
+ ((const struct file *)ptr)->f_path.dentry,
+ spec, fmt);
}
spec.flags |= SMALL;
if (spec.field_width == -1) {
@@ -1362,6 +1570,8 @@ qualifier:
* %pI6 print an IPv6 address with colons
* %pi6 print an IPv6 address without colons
* %pI6c print an IPv6 address as specified by RFC 5952
+ * %pIS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address
+ * %piS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address
* %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
* case.
* %*ph[CDN] a variable-length hex string with a separator (supports up to 64
generated by cgit (git 2.34.1) at 2025-08-14 03:37:24 +0000