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[PATCH 3.19.y-ckt 49/70] MIPS: traps: Fix SIGFPE information leak from `do_ov' and `do_trap_or_bp'

From Kamal Mostafa <kamal@canonical.com>
Newsgroups linux.kernel
Subject [PATCH 3.19.y-ckt 49/70] MIPS: traps: Fix SIGFPE information leak from `do_ov' and `do_trap_or_bp'
Date 2016-03-16 21:20 +0100
Message-ID <rdq5e-5os-59@gated-at.bofh.it> (permalink)
References <rdpVv-5jX-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

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v3.19.8-ckt17 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: "Maciej W. Rozycki" <macro@imgtec.com>

commit e723e3f7f9591b79e8c56b3d7c5a204a9c571b55 upstream.

Avoid sending a partially initialised `siginfo_t' structure along SIGFPE
signals issued from `do_ov' and `do_trap_or_bp', leading to information
leaking from the kernel stack.

Signed-off-by: Maciej W. Rozycki <macro@imgtec.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 arch/mips/kernel/traps.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 3e0e61f..7dd15e9 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -692,15 +692,15 @@ static int simulate_sync(struct pt_regs *regs, unsigned int opcode)
 asmlinkage void do_ov(struct pt_regs *regs)
 {
 	enum ctx_state prev_state;
-	siginfo_t info;
+	siginfo_t info = {
+		.si_signo = SIGFPE,
+		.si_code = FPE_INTOVF,
+		.si_addr = (void __user *)regs->cp0_epc,
+	};
 
 	prev_state = exception_enter();
 	die_if_kernel("Integer overflow", regs);
 
-	info.si_code = FPE_INTOVF;
-	info.si_signo = SIGFPE;
-	info.si_errno = 0;
-	info.si_addr = (void __user *) regs->cp0_epc;
 	force_sig_info(SIGFPE, &info, current);
 	exception_exit(prev_state);
 }
@@ -847,7 +847,7 @@ out:
 static void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
 	const char *str)
 {
-	siginfo_t info;
+	siginfo_t info = { 0 };
 	char b[40];
 
 #ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
@@ -875,7 +875,6 @@ static void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
 		else
 			info.si_code = FPE_INTOVF;
 		info.si_signo = SIGFPE;
-		info.si_errno = 0;
 		info.si_addr = (void __user *) regs->cp0_epc;
 		force_sig_info(SIGFPE, &info, current);
 		break;
-- 
2.7.0

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[3.19.y-ckt stable] Linux v3.19.8-ckt17 stable review Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:10 +0100
  [PATCH 3.19.y-ckt 03/70] wext: fix message delay/ordering Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:10 +0100
  [PATCH 3.19.y-ckt 58/70] tracing: Fix check for cpu online when event is disabled Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:10 +0100
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  [PATCH 3.19.y-ckt 09/70] ahci: add new Intel device IDs Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:10 +0100
  [PATCH 3.19.y-ckt 47/70] ovl: fix getcwd() failure after unsuccessful rmdir Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:10 +0100
  [PATCH 3.19.y-ckt 54/70] Revert "drm/radeon: call hpd_irq_event on resume" Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:10 +0100
  [PATCH 3.19.y-ckt 16/70] Fix directory hardlinks from deleted directories Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:10 +0100
  [PATCH 3.19.y-ckt 44/70] drm/radeon/pm: update current crtc info after setting the powerstate Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:10 +0100
  [PATCH 3.19.y-ckt 23/70] ALSA: rawmidi: Fix ioctls X32 ABI Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:10 +0100
  [PATCH 3.19.y-ckt 69/70] mld, igmp: Fix reserved tailroom calculation Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:10 +0100
  [PATCH 3.19.y-ckt 61/70] gpio: rcar: Add Runtime PM handling for interrupts Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:20 +0100
  [PATCH 3.19.y-ckt 56/70] jffs2: reduce the breakage on recovery from halfway failed rename() Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:20 +0100
  [PATCH 3.19.y-ckt 65/70] ipv6: re-enable fragment header matching in ipv6_find_hdr Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:20 +0100
  [PATCH 3.19.y-ckt 66/70] cdc_ncm: do not call usbnet_link_change from cdc_ncm_bind Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:20 +0100
  [PATCH 3.19.y-ckt 51/70] target: Drop incorrect ABORT_TASK put for completed commands Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:20 +0100
  [PATCH 3.19.y-ckt 55/70] KVM: PPC: Book3S HV: Sanitize special-purpose register values on guest exit Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:20 +0100
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  [PATCH 3.19.y-ckt 52/70] ARM: OMAP2+: hwmod: Introduce ti,no-idle dt property Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:20 +0100
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  [PATCH 3.19.y-ckt 57/70] KVM: VMX: disable PEBS before a guest entry Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:20 +0100
  [PATCH 3.19.y-ckt 50/70] ubi: Fix out of bounds write in volume update code Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:20 +0100
  [PATCH 3.19.y-ckt 67/70] net: qca_spi: Don't clear IFF_BROADCAST Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:20 +0100
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  [PATCH 3.19.y-ckt 39/70] USB: serial: option: add support for Quectel UC20 Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:20 +0100
  [PATCH 3.19.y-ckt 62/70] tcp: convert cached rtt from usec to jiffies when feeding initial rto Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:20 +0100
  [PATCH 3.19.y-ckt 64/70] net/mlx4_core: Allow resetting VF admin mac to zero Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:20 +0100
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  [PATCH 3.19.y-ckt 63/70] ext4: iterate over buffer heads correctly in move_extent_per_page() Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:20 +0100
  [PATCH 3.19.y-ckt 49/70] MIPS: traps: Fix SIGFPE information leak from `do_ov' and `do_trap_or_bp' Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:20 +0100
  [PATCH 3.19.y-ckt 42/70] drm/ast: Fix incorrect register check for DRAM width Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:20 +0100
  [PATCH 3.19.y-ckt 40/70] mac80211: Fix Public Action frame RX in AP mode Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:20 +0100
  [PATCH 3.19.y-ckt 41/70] ALSA: seq: oss: Don't drain at closing a client Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:20 +0100
  [PATCH 3.19.y-ckt 32/70] ALSA: hdsp: Fix wrong boolean ctl value accesses Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:20 +0100
  [PATCH 3.19.y-ckt 60/70] MIPS: Fix build error when SMP is used without GIC Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:20 +0100
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  [PATCH 3.19.y-ckt 48/70] ovl: copy new uid/gid into overlayfs runtime inode Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:20 +0100
  [PATCH 3.19.y-ckt 04/70] cfg80211/wext: fix message ordering Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100
  [PATCH 3.19.y-ckt 11/70] Adding Intel Lewisburg device IDs for SATA Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100
  [PATCH 3.19.y-ckt 30/70] ALSA: hdspm: Fix wrong boolean ctl value accesses Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100
  [PATCH 3.19.y-ckt 15/70] jffs2: Fix page lock / f->sem deadlock Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100
  [PATCH 3.19.y-ckt 05/70] mac80211: fix use of uninitialised values in RX aggregation Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100
  [PATCH 3.19.y-ckt 18/70] iommu/amd: Apply workaround for ATS write permission check Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100
  [PATCH 3.19.y-ckt 28/70] Fix cifs_uniqueid_to_ino_t() function for s390x Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100
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  [PATCH 3.19.y-ckt 37/70] ASoC: wm_adsp: Fix enum ctl accesses in a wrong type Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100
  [PATCH 3.19.y-ckt 26/70] cifs: fix out-of-bounds access in lease parsing Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100
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  [PATCH 3.19.y-ckt 02/70] Input: aiptek - fix crash on detecting device without endpoints Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100
  [PATCH 3.19.y-ckt 06/70] libata: fix HDIO_GET_32BIT ioctl Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100
  [PATCH 3.19.y-ckt 20/70] can: gs_usb: fixed disconnect bug by removing erroneous use of kfree() Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100
  [PATCH 3.19.y-ckt 25/70] ALSA: timer: Fix ioctls for X32 ABI Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100
  [PATCH 3.19.y-ckt 31/70] ALSA: hdspm: Fix zero-division Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100
  [PATCH 3.19.y-ckt 14/70] Revert "jffs2: Fix lock acquisition order bug in jffs2_write_begin" Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100
  [PATCH 3.19.y-ckt 27/70] CIFS: Fix SMB2+ interim response processing for read requests Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100
  [PATCH 3.19.y-ckt 36/70] ASoC: wm8994: Fix enum ctl accesses in a wrong type Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100
  [PATCH 3.19.y-ckt 12/70] mac80211: minstrel_ht: set default tx aggregation timeout to 0 Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100
  [PATCH 3.19.y-ckt 17/70] iommu/amd: Fix boot warning when device 00:00.0 is not iommu covered Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100
  [PATCH 3.19.y-ckt 21/70] vfio: fix ioctl error handling Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100
  [PATCH 3.19.y-ckt 13/70] usb: chipidea: otg: change workqueue ci_otg as freezable Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100
  [PATCH 3.19.y-ckt 35/70] ASoC: wm8958: Fix enum ctl accesses in a wrong type Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100
  [PATCH 3.19.y-ckt 07/70] iwlwifi: mvm: inc pending frames counter also when txing non-sta Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100
  [PATCH 3.19.y-ckt 19/70] libata: Align ata_device's id on a cacheline Kamal Mostafa <kamal@canonical.com> - 2016-03-16 21:30 +0100

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