diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/vsprintf.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 92e6085eef15..6c56c62fd9a5 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -2152,6 +2152,9 @@ EXPORT_SYMBOL_GPL(no_hash_pointers); static int __init no_hash_pointers_enable(char *str) { + if (no_hash_pointers) + return 0; + no_hash_pointers = true; pr_warn("**********************************************************\n"); @@ -2242,7 +2245,9 @@ early_param("no_hash_pointers", no_hash_pointers_enable); * Implements a "recursive vsnprintf". * Do not use this feature without some mechanism to verify the * correctness of the format string and va_list arguments. - * - 'K' For a kernel pointer that should be hidden from unprivileged users + * - 'K' For a kernel pointer that should be hidden from unprivileged users. + * Use only for procfs, sysfs and similar files, not printk(); please + * read the documentation (path below) first. * - 'NF' For a netdev_features_t * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with * a certain separator (' ' by default): @@ -2281,7 +2286,8 @@ early_param("no_hash_pointers", no_hash_pointers_enable); * Without an option prints the full name of the node * f full name * P node name, including a possible unit address - * - 'x' For printing the address. Equivalent to "%lx". + * - 'x' For printing the address unmodified. Equivalent to "%lx". + * Please read the documentation (path below) before using! * - '[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: @@ -3191,8 +3197,6 @@ int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) switch (*fmt) { case 'S': case 's': - case 'F': - case 'f': case 'x': case 'K': case 'e': |