mirror of https://gitee.com/openkylin/linux.git
Printk changes for 4.20
-----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAABAgAGBQJb0GRmAAoJEFKgDEdIgJTy/IEQAKOC4fHonA5LUa8GEO7s+byX LNQzH/NAR+86CCKdWzaiCpyNEbwzXC/5kFuGB+NIKGrutQ+HO1haKG6URRvZiw0c YgxaRpJ1h5OfZNuCjql5dX/bFAuBPwEPUAPusA4YJYSiXota2O76OW+RwEpr71i5 /Z2ygi3nlPECOhS1jTwY+cxGci67cfBIzKKdTXEft53xO38xAp0+Ea5Ljf2kIbgl rNz6XqJcy7rcAwEvh1kHw0AVEauLWs4NRlLX5eX7FHnqoh4TVFxWhLfNKirRo7gb vHemuucVUdvgG8yoFyg9CkFNLIMV9fWyDXkxab7dvrgD61oceLbNZ7dL86eijz7j qBoQy/igiH1nqIiczhTtp+JltIMzjPmC3unaie7f+oTHnKinzAaaND3wUjqObdZm MZQWsjIpBXC1nIcIs35NZiVMs8xcOG/sekkRcjU6/kbrBkoRqR5xhbm/tIcaCj0Z wKTlgET9b4dnmX8ZiEpvrfeMGxEu4yqfh1O3rvKnk8hKgxTvnzsSriHKh86KSv1L Gby4BA1zYwQxsJJ6LZMJjtHptxKBTcLANx8C/E9wPETP4EM5A1m5egJYRlDW3hb9 MhM4vzUQfq63b9gPduP10jlLrXsWBQRAcAvtvm2lou3TNqipm6ZqVn9vqkv0retR Auk7mO33MVpHbDOQw1GK =N+Ts -----END PGP SIGNATURE----- Merge tag 'printk-for-4.20' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk Pull printk updates from Petr Mladek: - Fix two more locations where printf formatting leaked pointers - Better log_buf_len parameter handling - Add prefix to messages from printk code - Do not miss messages on other consoles when the log is replayed on a new one - Reduce race between console registration and panic() when the log might get replayed on all consoles - Some cont buffer code clean up - Call console only when there is something to do (log vs cont buffer) * tag 'printk-for-4.20' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk: lib/vsprintf: Hash printed address for netdev bits fallback lib/vsprintf: Hash legacy clock addresses lib/vsprintf: Prepare for more general use of ptr_to_id() lib/vsprintf: Make ptr argument conts in ptr_to_id() printk: fix integer overflow in setup_log_buf() printk: do not preliminary split up cont buffer printk: lock/unlock console only for new logbuf entries printk: keep kernel cont support always enabled printk: Give error on attempt to set log buffer length to over 2G printk: Add KBUILD_MODNAME and remove a redundant print prefix printk: Correct wrong casting printk: Fix panic caused by passing log_buf_len to command line printk: CON_PRINTBUFFER console registration is a bit racy printk: Do not miss new messages when replaying the log
This commit is contained in:
Linus Torvalds
commit
a67eefad99
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@ -420,9 +420,8 @@ struct clk
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%pC pll1
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%pCn pll1
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For printing struct clk structures. %pC and %pCn print the name
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(Common Clock Framework) or address (legacy clock framework) of the
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structure.
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For printing struct clk structures. %pC and %pCn print the name of the clock
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(Common Clock Framework) or a unique 32-bit ID (legacy clock framework).
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Passed by reference.
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|
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@ -16,6 +16,8 @@
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* 01Mar01 Andrew Morton
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/tty.h>
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@ -192,16 +194,7 @@ int devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write,
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return 0;
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}
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/*
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* Number of registered extended console drivers.
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*
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* If extended consoles are present, in-kernel cont reassembly is disabled
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* and each fragment is stored as a separate log entry with proper
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* continuation flag so that every emitted message has full metadata. This
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* doesn't change the result for regular consoles or /proc/kmsg. For
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* /dev/kmsg, as long as the reader concatenates messages according to
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* consecutive continuation flags, the end result should be the same too.
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*/
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/* Number of registered extended console drivers. */
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static int nr_ext_console_drivers;
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/*
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@ -423,6 +416,7 @@ static u32 log_next_idx;
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/* the next printk record to write to the console */
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static u64 console_seq;
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static u32 console_idx;
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static u64 exclusive_console_stop_seq;
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/* the next printk record to read after the last 'clear' command */
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static u64 clear_seq;
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@ -437,6 +431,7 @@ static u32 clear_idx;
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/* record buffer */
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#define LOG_ALIGN __alignof__(struct printk_log)
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#define __LOG_BUF_LEN (1 << CONFIG_LOG_BUF_SHIFT)
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#define LOG_BUF_LEN_MAX (u32)(1 << 31)
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static char __log_buf[__LOG_BUF_LEN] __aligned(LOG_ALIGN);
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static char *log_buf = __log_buf;
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static u32 log_buf_len = __LOG_BUF_LEN;
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@ -1037,18 +1032,28 @@ void log_buf_vmcoreinfo_setup(void)
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static unsigned long __initdata new_log_buf_len;
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/* we practice scaling the ring buffer by powers of 2 */
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static void __init log_buf_len_update(unsigned size)
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static void __init log_buf_len_update(u64 size)
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{
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if (size > (u64)LOG_BUF_LEN_MAX) {
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size = (u64)LOG_BUF_LEN_MAX;
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pr_err("log_buf over 2G is not supported.\n");
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}
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if (size)
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size = roundup_pow_of_two(size);
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if (size > log_buf_len)
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new_log_buf_len = size;
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new_log_buf_len = (unsigned long)size;
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}
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/* save requested log_buf_len since it's too early to process it */
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static int __init log_buf_len_setup(char *str)
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{
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unsigned size = memparse(str, &str);
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u64 size;
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if (!str)
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return -EINVAL;
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size = memparse(str, &str);
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log_buf_len_update(size);
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@ -1093,7 +1098,7 @@ void __init setup_log_buf(int early)
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{
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unsigned long flags;
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char *new_log_buf;
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int free;
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unsigned int free;
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if (log_buf != __log_buf)
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return;
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@ -1113,7 +1118,7 @@ void __init setup_log_buf(int early)
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}
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if (unlikely(!new_log_buf)) {
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pr_err("log_buf_len: %ld bytes not available\n",
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pr_err("log_buf_len: %lu bytes not available\n",
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new_log_buf_len);
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return;
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}
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@ -1126,8 +1131,8 @@ void __init setup_log_buf(int early)
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memcpy(log_buf, __log_buf, __LOG_BUF_LEN);
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logbuf_unlock_irqrestore(flags);
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pr_info("log_buf_len: %d bytes\n", log_buf_len);
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pr_info("early log buf free: %d(%d%%)\n",
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pr_info("log_buf_len: %u bytes\n", log_buf_len);
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pr_info("early log buf free: %u(%u%%)\n",
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free, (free * 100) / __LOG_BUF_LEN);
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}
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@ -1767,12 +1772,8 @@ static void cont_flush(void)
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static bool cont_add(int facility, int level, enum log_flags flags, const char *text, size_t len)
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{
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/*
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* If ext consoles are present, flush and skip in-kernel
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* continuation. See nr_ext_console_drivers definition. Also, if
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* the line gets too long, split it up in separate records.
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*/
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if (nr_ext_console_drivers || cont.len + len > sizeof(cont.buf)) {
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/* If the line gets too long, split it up in separate records. */
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if (cont.len + len > sizeof(cont.buf)) {
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cont_flush();
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return false;
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}
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@ -1795,9 +1796,6 @@ static bool cont_add(int facility, int level, enum log_flags flags, const char *
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cont_flush();
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}
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if (cont.len > (sizeof(cont.buf) * 80) / 100)
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cont_flush();
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return true;
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}
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@ -1889,8 +1887,9 @@ asmlinkage int vprintk_emit(int facility, int level,
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const char *fmt, va_list args)
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{
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int printed_len;
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bool in_sched = false;
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bool in_sched = false, pending_output;
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unsigned long flags;
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u64 curr_log_seq;
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if (level == LOGLEVEL_SCHED) {
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level = LOGLEVEL_DEFAULT;
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@ -1902,11 +1901,13 @@ asmlinkage int vprintk_emit(int facility, int level,
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/* This stops the holder of console_sem just where we want him */
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logbuf_lock_irqsave(flags);
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curr_log_seq = log_next_seq;
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printed_len = vprintk_store(facility, level, dict, dictlen, fmt, args);
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pending_output = (curr_log_seq != log_next_seq);
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logbuf_unlock_irqrestore(flags);
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/* If called from the scheduler, we can not call up(). */
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if (!in_sched) {
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if (!in_sched && pending_output) {
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/*
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* Disable preemption to avoid being preempted while holding
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* console_sem which would prevent anyone from printing to
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@ -1923,7 +1924,8 @@ asmlinkage int vprintk_emit(int facility, int level,
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preempt_enable();
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}
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wake_up_klogd();
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if (pending_output)
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wake_up_klogd();
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return printed_len;
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}
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EXPORT_SYMBOL(vprintk_emit);
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@ -2009,6 +2011,7 @@ static u64 syslog_seq;
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static u32 syslog_idx;
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static u64 console_seq;
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static u32 console_idx;
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static u64 exclusive_console_stop_seq;
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static u64 log_first_seq;
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static u32 log_first_idx;
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static u64 log_next_seq;
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@ -2351,8 +2354,9 @@ void console_unlock(void)
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printk_safe_enter_irqsave(flags);
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raw_spin_lock(&logbuf_lock);
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if (console_seq < log_first_seq) {
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len = sprintf(text, "** %u printk messages dropped **\n",
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(unsigned)(log_first_seq - console_seq));
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len = sprintf(text,
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"** %llu printk messages dropped **\n",
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log_first_seq - console_seq);
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/* messages are gone, move to first one */
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console_seq = log_first_seq;
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@ -2376,6 +2380,12 @@ void console_unlock(void)
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goto skip;
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}
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/* Output to all consoles once old messages replayed. */
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if (unlikely(exclusive_console &&
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console_seq >= exclusive_console_stop_seq)) {
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exclusive_console = NULL;
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}
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len += msg_print_text(msg,
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console_msg_format & MSG_FORMAT_SYSLOG,
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text + len,
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@ -2418,10 +2428,6 @@ void console_unlock(void)
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console_locked = 0;
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/* Release the exclusive_console once it is used */
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if (unlikely(exclusive_console))
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exclusive_console = NULL;
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raw_spin_unlock(&logbuf_lock);
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up_console_sem();
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@ -2688,8 +2694,7 @@ void register_console(struct console *newcon)
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}
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if (newcon->flags & CON_EXTENDED)
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if (!nr_ext_console_drivers++)
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pr_info("printk: continuation disabled due to ext consoles, expect more fragments in /dev/kmsg\n");
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nr_ext_console_drivers++;
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if (newcon->flags & CON_PRINTBUFFER) {
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/*
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@ -2699,13 +2704,18 @@ void register_console(struct console *newcon)
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logbuf_lock_irqsave(flags);
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console_seq = syslog_seq;
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console_idx = syslog_idx;
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logbuf_unlock_irqrestore(flags);
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/*
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* We're about to replay the log buffer. Only do this to the
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* just-registered console to avoid excessive message spam to
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* the already-registered consoles.
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*
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* Set exclusive_console with disabled interrupts to reduce
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* race window with eventual console_flush_on_panic() that
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* ignores console_lock.
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*/
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exclusive_console = newcon;
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exclusive_console_stop_seq = console_seq;
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logbuf_unlock_irqrestore(flags);
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}
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console_unlock();
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console_sysfs_notify();
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|
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216
lib/vsprintf.c
216
lib/vsprintf.c
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@ -612,6 +612,109 @@ char *string(char *buf, char *end, const char *s, struct printf_spec spec)
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return widen_string(buf, len, end, spec);
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}
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static noinline_for_stack
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char *pointer_string(char *buf, char *end, const void *ptr,
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struct printf_spec spec)
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{
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spec.base = 16;
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spec.flags |= SMALL;
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if (spec.field_width == -1) {
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spec.field_width = 2 * sizeof(ptr);
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spec.flags |= ZEROPAD;
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}
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return number(buf, end, (unsigned long int)ptr, spec);
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}
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/* Make pointers available for printing early in the boot sequence. */
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static int debug_boot_weak_hash __ro_after_init;
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static int __init debug_boot_weak_hash_enable(char *str)
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{
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debug_boot_weak_hash = 1;
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pr_info("debug_boot_weak_hash enabled\n");
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return 0;
|
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}
|
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early_param("debug_boot_weak_hash", debug_boot_weak_hash_enable);
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|
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static DEFINE_STATIC_KEY_TRUE(not_filled_random_ptr_key);
|
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static siphash_key_t ptr_key __read_mostly;
|
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|
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static void enable_ptr_key_workfn(struct work_struct *work)
|
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{
|
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get_random_bytes(&ptr_key, sizeof(ptr_key));
|
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/* Needs to run from preemptible context */
|
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static_branch_disable(¬_filled_random_ptr_key);
|
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}
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|
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static DECLARE_WORK(enable_ptr_key_work, enable_ptr_key_workfn);
|
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|
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static void fill_random_ptr_key(struct random_ready_callback *unused)
|
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{
|
||||
/* This may be in an interrupt handler. */
|
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queue_work(system_unbound_wq, &enable_ptr_key_work);
|
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}
|
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|
||||
static struct random_ready_callback random_ready = {
|
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.func = fill_random_ptr_key
|
||||
};
|
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|
||||
static int __init initialize_ptr_random(void)
|
||||
{
|
||||
int key_size = sizeof(ptr_key);
|
||||
int ret;
|
||||
|
||||
/* Use hw RNG if available. */
|
||||
if (get_random_bytes_arch(&ptr_key, key_size) == key_size) {
|
||||
static_branch_disable(¬_filled_random_ptr_key);
|
||||
return 0;
|
||||
}
|
||||
|
||||
ret = add_random_ready_callback(&random_ready);
|
||||
if (!ret) {
|
||||
return 0;
|
||||
} else if (ret == -EALREADY) {
|
||||
/* This is in preemptible context */
|
||||
enable_ptr_key_workfn(&enable_ptr_key_work);
|
||||
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, const void *ptr,
|
||||
struct printf_spec spec)
|
||||
{
|
||||
const char *str = sizeof(ptr) == 8 ? "(____ptrval____)" : "(ptrval)";
|
||||
unsigned long hashval;
|
||||
|
||||
/* When debugging early boot use non-cryptographically secure hash. */
|
||||
if (unlikely(debug_boot_weak_hash)) {
|
||||
hashval = hash_long((unsigned long)ptr, 32);
|
||||
return pointer_string(buf, end, (const void *)hashval, spec);
|
||||
}
|
||||
|
||||
if (static_branch_unlikely(¬_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);
|
||||
}
|
||||
|
||||
static noinline_for_stack
|
||||
char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec,
|
||||
const char *fmt)
|
||||
|
|
@ -1357,20 +1460,6 @@ char *uuid_string(char *buf, char *end, const u8 *addr,
|
|||
return string(buf, end, uuid, 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);
|
||||
}
|
||||
|
||||
int kptr_restrict __read_mostly;
|
||||
|
||||
static noinline_for_stack
|
||||
|
|
@ -1421,7 +1510,8 @@ char *restricted_pointer(char *buf, char *end, const void *ptr,
|
|||
}
|
||||
|
||||
static noinline_for_stack
|
||||
char *netdev_bits(char *buf, char *end, const void *addr, const char *fmt)
|
||||
char *netdev_bits(char *buf, char *end, const void *addr,
|
||||
struct printf_spec spec, const char *fmt)
|
||||
{
|
||||
unsigned long long num;
|
||||
int size;
|
||||
|
|
@ -1432,9 +1522,7 @@ char *netdev_bits(char *buf, char *end, const void *addr, const char *fmt)
|
|||
size = sizeof(netdev_features_t);
|
||||
break;
|
||||
default:
|
||||
num = (unsigned long)addr;
|
||||
size = sizeof(unsigned long);
|
||||
break;
|
||||
return ptr_to_id(buf, end, addr, spec);
|
||||
}
|
||||
|
||||
return special_hex_number(buf, end, num, size);
|
||||
|
|
@ -1474,7 +1562,7 @@ char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec,
|
|||
#ifdef CONFIG_COMMON_CLK
|
||||
return string(buf, end, __clk_get_name(clk), spec);
|
||||
#else
|
||||
return special_hex_number(buf, end, (unsigned long)clk, sizeof(unsigned long));
|
||||
return ptr_to_id(buf, end, clk, spec);
|
||||
#endif
|
||||
}
|
||||
}
|
||||
|
|
@ -1651,94 +1739,6 @@ char *device_node_string(char *buf, char *end, struct device_node *dn,
|
|||
return widen_string(buf, buf - buf_start, end, spec);
|
||||
}
|
||||
|
||||
/* Make pointers available for printing early in the boot sequence. */
|
||||
static int debug_boot_weak_hash __ro_after_init;
|
||||
|
||||
static int __init debug_boot_weak_hash_enable(char *str)
|
||||
{
|
||||
debug_boot_weak_hash = 1;
|
||||
pr_info("debug_boot_weak_hash enabled\n");
|
||||
return 0;
|
||||
}
|
||||
early_param("debug_boot_weak_hash", debug_boot_weak_hash_enable);
|
||||
|
||||
static DEFINE_STATIC_KEY_TRUE(not_filled_random_ptr_key);
|
||||
static siphash_key_t ptr_key __read_mostly;
|
||||
|
||||
static void enable_ptr_key_workfn(struct work_struct *work)
|
||||
{
|
||||
get_random_bytes(&ptr_key, sizeof(ptr_key));
|
||||
/* Needs to run from preemptible context */
|
||||
static_branch_disable(¬_filled_random_ptr_key);
|
||||
}
|
||||
|
||||
static DECLARE_WORK(enable_ptr_key_work, enable_ptr_key_workfn);
|
||||
|
||||
static void fill_random_ptr_key(struct random_ready_callback *unused)
|
||||
{
|
||||
/* This may be in an interrupt handler. */
|
||||
queue_work(system_unbound_wq, &enable_ptr_key_work);
|
||||
}
|
||||
|
||||
static struct random_ready_callback random_ready = {
|
||||
.func = fill_random_ptr_key
|
||||
};
|
||||
|
||||
static int __init initialize_ptr_random(void)
|
||||
{
|
||||
int key_size = sizeof(ptr_key);
|
||||
int ret;
|
||||
|
||||
/* Use hw RNG if available. */
|
||||
if (get_random_bytes_arch(&ptr_key, key_size) == key_size) {
|
||||
static_branch_disable(¬_filled_random_ptr_key);
|
||||
return 0;
|
||||
}
|
||||
|
||||
ret = add_random_ready_callback(&random_ready);
|
||||
if (!ret) {
|
||||
return 0;
|
||||
} else if (ret == -EALREADY) {
|
||||
/* This is in preemptible context */
|
||||
enable_ptr_key_workfn(&enable_ptr_key_work);
|
||||
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;
|
||||
|
||||
/* When debugging early boot use non-cryptographically secure hash. */
|
||||
if (unlikely(debug_boot_weak_hash)) {
|
||||
hashval = hash_long((unsigned long)ptr, 32);
|
||||
return pointer_string(buf, end, (const void *)hashval, spec);
|
||||
}
|
||||
|
||||
if (static_branch_unlikely(¬_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
|
||||
|
|
@ -1942,7 +1942,7 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
|
|||
break;
|
||||
return restricted_pointer(buf, end, ptr, spec);
|
||||
case 'N':
|
||||
return netdev_bits(buf, end, ptr, fmt);
|
||||
return netdev_bits(buf, end, ptr, spec, fmt);
|
||||
case 'a':
|
||||
return address_val(buf, end, ptr, fmt);
|
||||
case 'd':
|
||||
|
|
|
|||
Loading…
Reference in New Issue