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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>
CC:     "Eric W. Biederman" <ebiederm@xmission.com>,
        James Hogan <james.hogan@imgtec.com>,
        "linux-metag@vger.kernel.org" <linux-metag@vger.kernel.org>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.15 119/124] signal/metag: Document a conflict
 with SI_USER with SIGFPE
Thread-Topic: [PATCH AUTOSEL for 4.15 119/124] signal/metag: Document a
 conflict with SI_USER with SIGFPE
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Date:   Mon, 19 Mar 2018 15:49:15 +0000
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From: "Eric W. Biederman" <ebiederm@xmission.com>

[ Upstream commit b80328be53c215346b153769267b38f531d89b4f ]

Setting si_code to 0 results in a userspace seeing an si_code of 0.
This is the same si_code as SI_USER.  Posix and common sense requires
that SI_USER not be a signal specific si_code.  As such this use of 0
for the si_code is a pretty horribly broken ABI.

Further use of si_code =3D=3D 0 guaranteed that copy_siginfo_to_user saw a
value of __SI_KILL and now sees a value of SIL_KILL with the result
hat uid and pid fields are copied and which might copying the si_addr
field by accident but certainly not by design.  Making this a very
flakey implementation.

Utilizing FPE_FIXME siginfo_layout will now return SIL_FAULT and the
appropriate fields will reliably be copied.

Possible ABI fixes includee:
  - Send the signal without siginfo
  - Don't generate a signal
  - Possibly assign and use an appropriate si_code
  - Don't handle cases which can't happen

Cc: James Hogan <james.hogan@imgtec.com>
Cc: linux-metag@vger.kernel.org
Ref: ac919f0883e5 ("metag: Traps")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 arch/metag/include/uapi/asm/siginfo.h | 7 +++++++
 arch/metag/kernel/traps.c             | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/metag/include/uapi/asm/siginfo.h b/arch/metag/include/uap=
i/asm/siginfo.h
index b54ef7186ca3..9a3f6cde9487 100644
--- a/arch/metag/include/uapi/asm/siginfo.h
+++ b/arch/metag/include/uapi/asm/siginfo.h
@@ -6,4 +6,11 @@
=20
 #include <asm-generic/siginfo.h>
=20
+/*
+ * SIGFPE si_codes
+ */
+#ifdef __KERNEL__
+#define FPE_FIXME      0       /* Broken dup of SI_USER */
+#endif /* __KERNEL__ */
+
 #endif
diff --git a/arch/metag/kernel/traps.c b/arch/metag/kernel/traps.c
index 444851e510d5..3b62b1b0c0b5 100644
--- a/arch/metag/kernel/traps.c
+++ b/arch/metag/kernel/traps.c
@@ -735,7 +735,7 @@ TBIRES fpe_handler(TBIRES State, int SigNum, int Trigge=
rs, int Inst, PTBI pTBI)
 	else if (error_state & TXSTAT_FPE_INEXACT_BIT)
 		info.si_code =3D FPE_FLTRES;
 	else
-		info.si_code =3D 0;
+		info.si_code =3D FPE_FIXME;
 	info.si_errno =3D 0;
 	info.si_addr =3D (__force void __user *)regs->ctx.CurrPC;
 	force_sig_info(SIGFPE, &info, current);
--=20
2.14.1