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>,
Paul Mackerras <paulus@samba.org>,
Kumar Gala <kumar.gala@freescale.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.4 166/167] signal/powerpc: Document conflicts with SI_USER and SIGFPE and SIGTRAP
Date: Mon, 19 Mar 2018 16:08:52 +0000 [thread overview]
Message-ID: <20180319160513.16384-166-alexander.levin@microsoft.com> (raw)
In-Reply-To: <20180319160513.16384-1-alexander.levin@microsoft.com>
From: "Eric W. Biederman" <ebiederm@xmission.com>
[ Upstream commit cf4674c46c66e45f238f8f7e81af2a444b970c0a ]
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
that 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 and TRAP_FIXME, siginfo_layout() will now return
SIL_FAULT and the appropriate fields will be reliably 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: Paul Mackerras <paulus@samba.org>
Cc: Kumar Gala <kumar.gala@freescale.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@lists.ozlabs.org
Ref: 9bad068c24d7 ("[PATCH] ppc32: support for e500 and 85xx")
Ref: 0ed70f6105ef ("PPC32: Provide proper siginfo information on various ex=
ceptions.")
History Tree: https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.=
git
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
arch/powerpc/include/uapi/asm/siginfo.h | 15 +++++++++++++++
arch/powerpc/kernel/traps.c | 10 +++++-----
2 files changed, 20 insertions(+), 5 deletions(-)
diff --git a/arch/powerpc/include/uapi/asm/siginfo.h b/arch/powerpc/include=
/uapi/asm/siginfo.h
index ccce3ef5cd86..9c437eaf7c21 100644
--- a/arch/powerpc/include/uapi/asm/siginfo.h
+++ b/arch/powerpc/include/uapi/asm/siginfo.h
@@ -17,4 +17,19 @@
#undef NSIGTRAP
#define NSIGTRAP 4
=20
+/*
+ * SIGFPE si_codes
+ */
+#ifdef __KERNEL__
+#define FPE_FIXME 0 /* Broken dup of SI_USER */
+#endif /* __KERNEL__ */
+
+/*
+ * SIGTRAP si_codes
+ */
+#ifdef __KERNEL__
+#define TRAP_FIXME 0 /* Broken dup of SI_USER */
+#endif /* __KERNEL__ */
+
+
#endif /* _ASM_POWERPC_SIGINFO_H */
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index e4dcb0a43e3f..9ac9dfa6f796 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -771,7 +771,7 @@ void unknown_exception(struct pt_regs *regs)
printk("Bad trap at PC: %lx, SR: %lx, vector=3D%lx\n",
regs->nip, regs->msr, regs->trap);
=20
- _exception(SIGTRAP, regs, 0, 0);
+ _exception(SIGTRAP, regs, TRAP_FIXME, 0);
=20
exception_exit(prev_state);
}
@@ -793,7 +793,7 @@ void instruction_breakpoint_exception(struct pt_regs *r=
egs)
=20
void RunModeException(struct pt_regs *regs)
{
- _exception(SIGTRAP, regs, 0, 0);
+ _exception(SIGTRAP, regs, TRAP_FIXME, 0);
}
=20
void __kprobes single_step_exception(struct pt_regs *regs)
@@ -828,7 +828,7 @@ static void emulate_single_step(struct pt_regs *regs)
=20
static inline int __parse_fpscr(unsigned long fpscr)
{
- int ret =3D 0;
+ int ret =3D FPE_FIXME;
=20
/* Invalid operation */
if ((fpscr & FPSCR_VE) && (fpscr & FPSCR_VX))
@@ -1764,7 +1764,7 @@ void SPEFloatingPointException(struct pt_regs *regs)
extern int do_spe_mathemu(struct pt_regs *regs);
unsigned long spefscr;
int fpexc_mode;
- int code =3D 0;
+ int code =3D FPE_FIXME;
int err;
=20
flush_spe_to_thread(current);
@@ -1833,7 +1833,7 @@ void SPEFloatingPointRoundException(struct pt_regs *r=
egs)
printk(KERN_ERR "unrecognized spe instruction "
"in %s at %lx\n", current->comm, regs->nip);
} else {
- _exception(SIGFPE, regs, 0, regs->nip);
+ _exception(SIGFPE, regs, FPE_FIXME, regs->nip);
return;
}
}
--=20
2.14.1
parent reply other threads:[~2018-03-19 16:11 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <20180319160513.16384-1-alexander.levin@microsoft.com>]
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