Patch "Revert "ARC: entry: fix potential EFA clobber when TIF_SYSCALL_TRACE"" has been added to the 4.19-stable tree

[gregkh at linuxfoundation.org]

This is a note to let you know that I've just added the patch titled

    Revert "ARC: entry: fix potential EFA clobber when TIF_SYSCALL_TRACE"

to the 4.19-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:
     revert-arc-entry-fix-potential-efa-clobber-when-tif_syscall_trace.patch
and it can be found in the queue-4.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable at vger.kernel.org> know about it.


>From Vineet.Gupta1 at synopsys.com  Mon Nov  9 11:28:19 2020
From: Vineet Gupta <Vineet.Gupta1 at synopsys.com>
Date: Mon, 19 Oct 2020 19:19:57 -0700
Subject: Revert "ARC: entry: fix potential EFA clobber when TIF_SYSCALL_TRACE"
To: stable at vger.kernel.org
Cc: linux-snps-arc at lists.infradead.org, linux-kernel at vger.kernel.org, Vineet Gupta <Vineet.Gupta1 at synopsys.com>, Waldemar Brodkorb <wbx at uclibc-ng.org>
Message-ID: <20201020021957.1260521-1-vgupta at synopsys.com>

From: Vineet Gupta <Vineet.Gupta1 at synopsys.com>

This reverts commit 00fdec98d9881bf5173af09aebd353ab3b9ac729.
(but only from 5.2 and prior kernels)

The original commit was a preventive fix based on code-review and was
auto-picked for stable back-port (for better or worse).
It was OK for v5.3+ kernels, but turned up needing an implicit change
68e5c6f073bcf70 "(ARC: entry: EV_Trap expects r10 (vs. r9) to have
 exception cause)" merged in v5.3 which itself was not backported.
So to summarize the stable backport of this patch for v5.2 and prior
kernels is busted and it won't boot.

The obvious solution is backport 68e5c6f073bcf70 but that is a pain as
it doesn't revert cleanly and each of affected kernels (so far v4.19,
v4.14, v4.9, v4.4) needs a slightly different massaged varaint.
So the easier fix is to simply revert the backport from 5.2 and prior.
The issue was not a big deal as it would cause strace to sporadically
not work correctly.

Waldemar Brodkorb first reported this when running ARC uClibc regressions
on latest stable kernels (with offending backport). Once he bisected it,
the analysis was trivial, so thx to him for this.

Reported-by: Waldemar Brodkorb <wbx at uclibc-ng.org>
Bisected-by: Waldemar Brodkorb <wbx at uclibc-ng.org>
Cc: stable <stable at vger.kernel.org> # 5.2 and prior
Signed-off-by: Vineet Gupta <vgupta at synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 arch/arc/kernel/entry.S |   16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

--- a/arch/arc/kernel/entry.S
+++ b/arch/arc/kernel/entry.S
@@ -156,6 +156,7 @@ END(EV_Extension)
 tracesys:
 	; save EFA in case tracer wants the PC of traced task
 	; using ERET won't work since next-PC has already committed
+	lr  r12, [efa]
 	GET_CURR_TASK_FIELD_PTR   TASK_THREAD, r11
 	st  r12, [r11, THREAD_FAULT_ADDR]	; thread.fault_address
 
@@ -198,9 +199,15 @@ tracesys_exit:
 ; Breakpoint TRAP
 ; ---------------------------------------------
 trap_with_param:
-	mov r0, r12	; EFA in case ptracer/gdb wants stop_pc
+
+	; stop_pc info by gdb needs this info
+	lr  r0, [efa]
 	mov r1, sp
 
+	; Now that we have read EFA, it is safe to do "fake" rtie
+	;   and get out of CPU exception mode
+	FAKE_RET_FROM_EXCPN
+
 	; Save callee regs in case gdb wants to have a look
 	; SP will grow up by size of CALLEE Reg-File
 	; NOTE: clobbers r12
@@ -227,10 +234,6 @@ ENTRY(EV_Trap)
 
 	EXCEPTION_PROLOGUE
 
-	lr  r12, [efa]
-
-	FAKE_RET_FROM_EXCPN
-
 	;============ TRAP 1   :breakpoints
 	; Check ECR for trap with arg (PROLOGUE ensures r9 has ECR)
 	bmsk.f 0, r9, 7
@@ -238,6 +241,9 @@ ENTRY(EV_Trap)
 
 	;============ TRAP  (no param): syscall top level
 
+	; First return from Exception to pure K mode (Exception/IRQs renabled)
+	FAKE_RET_FROM_EXCPN
+
 	; If syscall tracing ongoing, invoke pre-post-hooks
 	GET_CURR_THR_INFO_FLAGS   r10
 	btst r10, TIF_SYSCALL_TRACE


Patches currently in stable-queue which might be from Vineet.Gupta1 at synopsys.com are

queue-4.19/revert-arc-entry-fix-potential-efa-clobber-when-tif_syscall_trace.patch