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* [merged mm-nonmm-stable] kernel-panic-increase-buffer-size-for-verbose-taint-logging.patch removed from -mm tree
@ 2026-03-28  4:24 Andrew Morton
  0 siblings, 0 replies; only message in thread
From: Andrew Morton @ 2026-03-28  4:24 UTC (permalink / raw)
  To: mm-commits, wangjinchao600, pmladek, joel.granados,
	rioo.tsukatsukii, akpm


The quilt patch titled
     Subject: kernel/panic: increase buffer size for verbose taint logging
has been removed from the -mm tree.  Its filename was
     kernel-panic-increase-buffer-size-for-verbose-taint-logging.patch

This patch was dropped because it was merged into the mm-nonmm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Rio <rioo.tsukatsukii@gmail.com>
Subject: kernel/panic: increase buffer size for verbose taint logging
Date: Fri, 20 Feb 2026 20:45:00 +0530

The verbose 'Tainted: ...' string in print_tainted_seq can total to 327
characters while the buffer defined in _print_tainted is 320 bytes. 
Increase its size to 350 characters to hold all flags, along with some
headroom.

[akpm@linux-foundation.org: fix spello, add comment]
Link: https://lkml.kernel.org/r/20260220151500.13585-1-rioo.tsukatsukii@gmail.com
Signed-off-by: Rio <rioo.tsukatsukii@gmail.com>
Cc: Joel Granados <joel.granados@kernel.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Wang Jinchao <wangjinchao600@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/panic.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/kernel/panic.c~kernel-panic-increase-buffer-size-for-verbose-taint-logging
+++ a/kernel/panic.c
@@ -801,6 +801,8 @@ EXPORT_SYMBOL(panic);
  * Documentation/admin-guide/tainted-kernels.rst, including its
  * small shell script that prints the TAINT_FLAGS_COUNT bits of
  * /proc/sys/kernel/tainted.
+ *
+ * Also, update TAINT_BUF_MAX below.
  */
 const struct taint_flag taint_flags[TAINT_FLAGS_COUNT] = {
 	TAINT_FLAG(PROPRIETARY_MODULE,		'P', 'G'),
@@ -854,10 +856,12 @@ static void print_tainted_seq(struct seq
 	}
 }
 
+/* 350 can accommodate all taint flags in verbose mode, with some headroom */
+#define TAINT_BUF_MAX 350
+
 static const char *_print_tainted(bool verbose)
 {
-	/* FIXME: what should the size be? */
-	static char buf[sizeof(taint_flags)];
+	static char buf[TAINT_BUF_MAX];
 	struct seq_buf s;
 
 	BUILD_BUG_ON(ARRAY_SIZE(taint_flags) != TAINT_FLAGS_COUNT);
_

Patches currently in -mm which might be from rioo.tsukatsukii@gmail.com are



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2026-03-28  4:24 [merged mm-nonmm-stable] kernel-panic-increase-buffer-size-for-verbose-taint-logging.patch removed from -mm tree Andrew Morton

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