linux-kernel - [PATCH v4 2/5] sparc: fix accurate exception reporting in copy_{from_to}

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Message-Id: <20250905-memcpy_series-v4-2-1ca72dda195b@mkarcher.dialup.fu-berlin.de>
Date: Fri, 05 Sep 2025 00:03:31 +0200
From: Michael Karcher <kernel@...rcher.dialup.fu-berlin.de>
To: Andreas Larsson <andreas@...sler.com>
Cc: sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Michael Karcher <kernel@...rcher.dialup.fu-berlin.de>, 
 John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>, 
 Anthony Yznaga <anthony.yznaga@...cle.com>, 
 René Rebe <rene@...ctcode.com>
Subject: [PATCH v4 2/5] sparc: fix accurate exception reporting in
 copy_{from_to}_user for UltraSPARC III

Anthony Yznaga tracked down that a BUG_ON in ext4 code with large folios
enabled resulted from copy_from_user() returning impossibly large values
greater than the size to be copied. This lead to __copy_from_iter()
returning impossible values instead of the actual number of bytes it was
able to copy.

The BUG_ON has been reported in
https://lore.kernel.org/r/b14f55642207e63e907965e209f6323a0df6dcee.camel@physik.fu-berlin.de

The referenced commit introduced exception handlers on user-space memory
references in copy_from_user and copy_to_user. These handlers return from
the respective function and calculate the remaining bytes left to copy
using the current register contents. The exception handlers expect that
%o2 has already been masked during the bulk copy loop, but the masking was
performed after that loop. This will fix the return value of copy_from_user
and copy_to_user in the faulting case. The behaviour of memcpy stays
unchanged.

Fixes: ee841d0aff64 ("sparc64: Convert U3copy_{from,to}_user to accurate exception reporting.")
Tested-by: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de> # on Sun Netra 240
Reviewed-by: Anthony Yznaga <anthony.yznaga@...cle.com>
Tested-by: René Rebe <rene@...ctcode.com> # on UltraSparc III+ and UltraSparc IIIi
Signed-off-by: Michael Karcher <kernel@...rcher.dialup.fu-berlin.de>
---
 arch/sparc/lib/U3memcpy.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/sparc/lib/U3memcpy.S b/arch/sparc/lib/U3memcpy.S
index 9248d59c734ce200f1f55e6d9913277f18715a87..bace3a18f836f1428ae0ed72b27aa1e00374089e 100644
--- a/arch/sparc/lib/U3memcpy.S
+++ b/arch/sparc/lib/U3memcpy.S
@@ -267,6 +267,7 @@ FUNC_NAME:	/* %o0=dst, %o1=src, %o2=len */
 	faligndata	%f10, %f12, %f26
 	EX_LD_FP(LOAD(ldd, %o1 + 0x040, %f0), U3_retl_o2)
 
+	and		%o2, 0x3f, %o2
 	subcc		GLOBAL_SPARE, 0x80, GLOBAL_SPARE
 	add		%o1, 0x40, %o1
 	bgu,pt		%XCC, 1f
@@ -336,7 +337,6 @@ FUNC_NAME:	/* %o0=dst, %o1=src, %o2=len */
 	 * Also notice how this code is careful not to perform a
 	 * load past the end of the src buffer.
 	 */
-	and		%o2, 0x3f, %o2
 	andcc		%o2, 0x38, %g2
 	be,pn		%XCC, 2f
 	 subcc		%g2, 0x8, %g2

-- 
2.50.1