[4.14] fs: sysfs_emit_at: Remove PAGE_SIZE alignment check

Commit Message

Eric Biggers March 17, 2023, 6:28 a.m. UTC

From: Eric Biggers <[e-mail]>

[No upstream commit because this fixes a bug in a backport.]

Before upstream commit 59bb47985c1d ("mm, sl[aou]b: guarantee natural
alignment for kmalloc(power-of-two)") which went into v5.4, kmalloc did
*not* always guarantee that PAGE_SIZE allocations are PAGE_SIZE-aligned.

Upstream commit 2efc459d06f1 ("sysfs: Add sysfs_emit and sysfs_emit_at
to format sysfs output") added two WARN()s that trigger when PAGE_SIZE
allocations are not PAGE_SIZE-aligned.  This was backported to old
kernels that don't guarantee PAGE_SIZE alignment.

Commit 10ddfb495232 ("fs: sysfs_emit: Remove PAGE_SIZE alignment check")
in 4.19.y, and its equivalent in 4.14.y and 4.9.y, tried to fix this
bug.  However, only it handled sysfs_emit(), not sysfs_emit_at().

Fix it in sysfs_emit_at() too.

A reproducer is to build the kernel with the following options:

	CONFIG_SLUB=y
	CONFIG_SLUB_DEBUG=y
	CONFIG_SLUB_DEBUG_ON=y
	CONFIG_PM=y
	CONFIG_SUSPEND=y
	CONFIG_PM_WAKELOCKS=y

Then run:

	echo foo > /sys/power/wake_lock && cat /sys/power/wake_lock

Fixes: 390881843b4f ("sysfs: Add sysfs_emit and sysfs_emit_at to format sysfs output")
Reported-by: kernel test robot <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Eric Biggers <[e-mail]>
---
 fs/sysfs/file.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch

diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index c41e7f51150fc..cef9a469f73a8 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -592,7 +592,7 @@  int sysfs_emit_at(char *buf, int at, const char *fmt, ...)
 	va_list args;
 	int len;
 
-	if (WARN(!buf || offset_in_page(buf) || at < 0 || at >= PAGE_SIZE,
+	if (WARN(!buf || at < 0 || at >= PAGE_SIZE,
 		 "invalid sysfs_emit_at: buf:%p at:%d\n", buf, at))
 		return 0;