This is a note to let you know that I've just added the patch titled metag/usercopy: Set flags before ADDZ to the 4.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: metag-usercopy-set-flags-before-addz.patch and it can be found in the queue-4.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From fd40eee1290ad7add7aa665e3ce6b0f9fe9734b4 Mon Sep 17 00:00:00 2001 From: James Hogan <james.hogan@xxxxxxxxxx> Date: Tue, 4 Apr 2017 11:43:26 +0100 Subject: metag/usercopy: Set flags before ADDZ From: James Hogan <james.hogan@xxxxxxxxxx> commit fd40eee1290ad7add7aa665e3ce6b0f9fe9734b4 upstream. The fixup code for the copy_to_user rapf loops reads TXStatus.LSM_STEP to decide how far to rewind the source pointer. There is a special case for the last execution of an MGETL/MGETD, since it leaves LSM_STEP=0 even though the number of MGETLs/MGETDs attempted was 4. This uses ADDZ which is conditional upon the Z condition flag, but the AND instruction which masked the TXStatus.LSM_STEP field didn't set the condition flags based on the result. Fix that now by using ANDS which does set the flags, and also marking the condition codes as clobbered by the inline assembly. Fixes: 373cd784d0fc ("metag: Memory handling") Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx> Cc: linux-metag@xxxxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/metag/lib/usercopy.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) --- a/arch/metag/lib/usercopy.c +++ b/arch/metag/lib/usercopy.c @@ -315,7 +315,7 @@ " .previous\n" \ : "=r" (to), "=r" (from), "=r" (ret), "=d" (n) \ : "0" (to), "1" (from), "2" (ret), "3" (n) \ - : "D1Ar1", "D0Ar2", "memory") + : "D1Ar1", "D0Ar2", "cc", "memory") /* rewind 'to' and 'from' pointers when a fault occurs * @@ -341,7 +341,7 @@ #define __asm_copy_to_user_64bit_rapf_loop(to, from, ret, n, id)\ __asm_copy_user_64bit_rapf_loop(to, from, ret, n, id, \ "LSR D0Ar2, D0Ar2, #8\n" \ - "AND D0Ar2, D0Ar2, #0x7\n" \ + "ANDS D0Ar2, D0Ar2, #0x7\n" \ "ADDZ D0Ar2, D0Ar2, #4\n" \ "SUB D0Ar2, D0Ar2, #1\n" \ "MOV D1Ar1, #4\n" \ @@ -486,7 +486,7 @@ " .previous\n" \ : "=r" (to), "=r" (from), "=r" (ret), "=d" (n) \ : "0" (to), "1" (from), "2" (ret), "3" (n) \ - : "D1Ar1", "D0Ar2", "memory") + : "D1Ar1", "D0Ar2", "cc", "memory") /* rewind 'to' and 'from' pointers when a fault occurs * @@ -512,7 +512,7 @@ #define __asm_copy_to_user_32bit_rapf_loop(to, from, ret, n, id)\ __asm_copy_user_32bit_rapf_loop(to, from, ret, n, id, \ "LSR D0Ar2, D0Ar2, #8\n" \ - "AND D0Ar2, D0Ar2, #0x7\n" \ + "ANDS D0Ar2, D0Ar2, #0x7\n" \ "ADDZ D0Ar2, D0Ar2, #4\n" \ "SUB D0Ar2, D0Ar2, #1\n" \ "MOV D1Ar1, #4\n" \ Patches currently in stable-queue which might be from james.hogan@xxxxxxxxxx are queue-4.10/mips-end-spinlocks-with-.insn.patch queue-4.10/metag-usercopy-add-missing-fixups.patch queue-4.10/metag-usercopy-add-early-abort-to-copy_to_user.patch queue-4.10/mips-ralink-fix-typos-in-rt3883-pinctrl.patch queue-4.10/metag-usercopy-set-flags-before-addz.patch queue-4.10/metag-usercopy-fix-src-fixup-in-from-user-rapf-loops.patch queue-4.10/metag-usercopy-drop-unused-macros.patch queue-4.10/mips-lantiq-fix-missing-xbar-kernel-panic.patch queue-4.10/metag-usercopy-zero-rest-of-buffer-from-copy_from_user.patch queue-4.10/metag-usercopy-fix-alignment-error-checking.patch queue-4.10/mips-force-o32-fp64-support-on-32bit-mips64r6-kernels.patch