Merge tag 'v5.7-rc7' into x86/amd

Linux 5.7-rc7

1 files changed, 19 insertions, 0 deletions

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 7c488a1ce318..7c47ad52ce2f 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -794,6 +794,13 @@ static char *ptr_to_id(char *buf, char *end, const void *ptr,
 	unsigned long hashval;
 	int ret;
 
+	/*
+	 * Print the real pointer value for NULL and error pointers,
+	 * as they are not actual addresses.
+	 */
+	if (IS_ERR_OR_NULL(ptr))
+		return pointer_string(buf, end, ptr, spec);
+
 	/* When debugging early boot use non-cryptographically secure hash. */
 	if (unlikely(debug_boot_weak_hash)) {
 		hashval = hash_long((unsigned long)ptr, 32);
@@ -2168,6 +2175,10 @@ char *fwnode_string(char *buf, char *end, struct fwnode_handle *fwnode,
  *		f full name
  *		P node name, including a possible unit address
  * - 'x' For printing the address. Equivalent to "%lx".
+ * - '[ku]s' For a BPF/tracing related format specifier, e.g. used out of
+ *           bpf_trace_printk() where [ku] prefix specifies either kernel (k)
+ *           or user (u) memory to probe, and:
+ *              s a string, equivalent to "%s" on direct vsnprintf() use
  *
  * ** When making changes please also update:
  *	Documentation/core-api/printk-formats.rst
@@ -2251,6 +2262,14 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 		if (!IS_ERR(ptr))
 			break;
 		return err_ptr(buf, end, ptr, spec);
+	case 'u':
+	case 'k':
+		switch (fmt[1]) {
+		case 's':
+			return string(buf, end, ptr, spec);
+		default:
+			return error_string(buf, end, "(einval)", spec);
+		}
 	}
 
 	/* default is to _not_ leak addresses, hash before printing */