linux-kernel - [GIT PULL] tracing: Minor fixes for 6.5

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Message-ID: <20230706103410.6499a3cc@gandalf.local.home>
Date:   Thu, 6 Jul 2023 10:34:10 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Mateusz Stachyra <m.stachyra@...sung.com>
Subject: [GIT PULL] tracing: Minor fixes for 6.5


Linus,

Tracing fixes for 6.5:

- Fix bad git merge of #endif in arm64 code
  A merge of the arm64 tree caused #endif to go into the wrong place

- Fix crash on lseek of write access to tracefs/error_log
  Opening error_log as write only, and then doing an lseek() causes
  a kernel panic, because the lseek() handle expects a "seq_file"
  to exist (which is not done on write only opens). Use tracing_lseek()
  that tests for this instead of calling the default seq lseek handler.

- Check for negative instead of -E2BIG for error on strscpy() returns
  Instead of testing for -E2BIG from strscpy(), to be more robust,
  check for less than zero, which will make sure it catches any error
  that strscpy() may someday return.


Please pull the latest trace-v6.5-2 tree, which can be found at:


  git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git
trace-v6.5-2

Tag SHA1: 8201ec458c9725804267e4eda962cdaf202e85f1
Head SHA1: fddca7db4a4c17f7333793dfb5308d80c76d2896


Arnd Bergmann (1):
      arm64: ftrace: fix build error with CONFIG_FUNCTION_GRAPH_TRACER=n

Mateusz Stachyra (1):
      tracing: Fix null pointer dereference in tracing_err_log_open()

Steven Rostedt (Google) (1):
      tracing/boot: Test strscpy() against less than zero for error

----
 arch/arm64/kernel/asm-offsets.c | 2 +-
 kernel/trace/trace.c            | 2 +-
 kernel/trace/trace_boot.c       | 8 ++++----
 3 files changed, 6 insertions(+), 6 deletions(-)
---------------------------
diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c
index 757d01a68ffd..5ff1942b04fc 100644
--- a/arch/arm64/kernel/asm-offsets.c
+++ b/arch/arm64/kernel/asm-offsets.c
@@ -213,9 +213,9 @@ int main(void)
   DEFINE(FGRET_REGS_X7,			offsetof(struct fgraph_ret_regs, regs[7]));
   DEFINE(FGRET_REGS_FP,			offsetof(struct fgraph_ret_regs, fp));
   DEFINE(FGRET_REGS_SIZE,		sizeof(struct fgraph_ret_regs));
+#endif
 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
   DEFINE(FTRACE_OPS_DIRECT_CALL,	offsetof(struct ftrace_ops, direct_call));
-#endif
 #endif
   return 0;
 }
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 64a4dde073ef..3d34e6fea6b2 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -8135,7 +8135,7 @@ static const struct file_operations tracing_err_log_fops = {
 	.open           = tracing_err_log_open,
 	.write		= tracing_err_log_write,
 	.read           = seq_read,
-	.llseek         = seq_lseek,
+	.llseek         = tracing_lseek,
 	.release        = tracing_err_log_release,
 };
 
diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
index 5fe525f1b8cc..7ccc7a8e155b 100644
--- a/kernel/trace/trace_boot.c
+++ b/kernel/trace/trace_boot.c
@@ -31,7 +31,7 @@ trace_boot_set_instance_options(struct trace_array *tr, struct xbc_node *node)
 
 	/* Common ftrace options */
 	xbc_node_for_each_array_value(node, "options", anode, p) {
-		if (strscpy(buf, p, ARRAY_SIZE(buf)) == -E2BIG) {
+		if (strscpy(buf, p, ARRAY_SIZE(buf)) < 0) {
 			pr_err("String is too long: %s\n", p);
 			continue;
 		}
@@ -87,7 +87,7 @@ trace_boot_enable_events(struct trace_array *tr, struct xbc_node *node)
 	const char *p;
 
 	xbc_node_for_each_array_value(node, "events", anode, p) {
-		if (strscpy(buf, p, ARRAY_SIZE(buf)) == -E2BIG) {
+		if (strscpy(buf, p, ARRAY_SIZE(buf)) < 0) {
 			pr_err("String is too long: %s\n", p);
 			continue;
 		}
@@ -486,7 +486,7 @@ trace_boot_init_one_event(struct trace_array *tr, struct xbc_node *gnode,
 
 	p = xbc_node_find_value(enode, "filter", NULL);
 	if (p && *p != '\0') {
-		if (strscpy(buf, p, ARRAY_SIZE(buf)) == -E2BIG)
+		if (strscpy(buf, p, ARRAY_SIZE(buf)) < 0)
 			pr_err("filter string is too long: %s\n", p);
 		else if (apply_event_filter(file, buf) < 0)
 			pr_err("Failed to apply filter: %s\n", buf);
@@ -494,7 +494,7 @@ trace_boot_init_one_event(struct trace_array *tr, struct xbc_node *gnode,
 
 	if (IS_ENABLED(CONFIG_HIST_TRIGGERS)) {
 		xbc_node_for_each_array_value(enode, "actions", anode, p) {
-			if (strscpy(buf, p, ARRAY_SIZE(buf)) == -E2BIG)
+			if (strscpy(buf, p, ARRAY_SIZE(buf)) < 0)
 				pr_err("action string is too long: %s\n", p);
 			else if (trigger_process_regex(file, buf) < 0)
 				pr_err("Failed to apply an action: %s\n", p);