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linux/arch/x86/kernel/cpu
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Colin Ian King 32043fa065 x86/mtrr: Don't copy uninitialized gentry fields back to userspace 
Currently the copy_to_user of data in the gentry struct is copying
uninitiaized data in field _pad from the stack to userspace.

Fix this by explicitly memset'ing gentry to zero, this also will zero any
compiler added padding fields that may be in struct (currently there are
none).

Detected by CoverityScan, CID#200783 ("Uninitialized scalar variable")

Fixes: b263b31e8a ("x86, mtrr: Use explicit sizing and padding for the 64-bit ioctls")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Tyler Hicks <tyhicks@canonical.com>
Cc: security@kernel.org
Link: https://lkml.kernel.org/r/20181218172956.1440-1-colin.king@canonical.com
2018-12-19 00:00:16 +01:00
..
mcheck x86/MCE/AMD: Fix the thresholding machinery initialization order 2018-11-28 10:10:36 +01:00
microcode Merge branches 'x86/early-printk', 'x86/microcode' and 'core/objtool' into x86/urgent, to pick up simple topic branches 2018-10-29 07:13:09 +01:00
mtrr x86/mtrr: Don't copy uninitialized gentry fields back to userspace 2018-12-19 00:00:16 +01:00
.gitignore
amd.c x86/cpu/amd: Remove unnecessary parentheses 2018-10-03 08:27:47 +02:00
aperfmperf.c x86 / CPU: Always show current CPU frequency in /proc/cpuinfo 2017-11-15 19:46:50 +01:00
bugs.c x86/speculation: Provide IBPB always command line options 2018-11-28 11:57:14 +01:00
cacheinfo.c x86/cpu: Get cache info and setup cache cpumap for Hygon Dhyana 2018-09-27 18:28:57 +02:00
centaur.c x86/CPU: Move x86_cpuinfo::x86_max_cores assignment to detect_num_cpu_cores() 2018-05-13 16:14:24 +02:00
common.c Merge branch 'core/urgent' into x86/urgent, to pick up objtool fix 2018-11-03 23:42:16 +01:00
cpu.h x86/cpu: Get cache info and setup cache cpumap for Hygon Dhyana 2018-09-27 18:28:57 +02:00
cpuid-deps.c x86/cpuid: Switch to 'static const' specifier 2018-03-08 12:23:42 +01:00
cyrix.c x86/CPU: Use correct macros for Cyrix calls 2018-09-22 11:46:56 +02:00
hygon.c x86/cpu: Get cache info and setup cache cpumap for Hygon Dhyana 2018-09-27 18:28:57 +02:00
hypervisor.c x86/jailhouse: Add infrastructure for running in non-root cell 2018-01-14 21:11:54 +01:00
intel_pconfig.c x86/pconfig: Detect PCONFIG targets 2018-03-12 12:10:54 +01:00
intel_rdt_ctrlmondata.c x86/intel_rdt: Ensure a CPU remains online for the region's pseudo-locking sequence 2018-12-11 21:59:01 +01:00
intel_rdt_monitor.c x86/intel_rdt/mba_sc: Feedback loop to dynamically update mem bandwidth 2018-05-19 13:16:44 +02:00
intel_rdt_pseudo_lock_event.h x86/intel_rdt: Support L3 cache performance event of Broadwell 2018-06-24 15:35:48 +02:00
intel_rdt_pseudo_lock.c Merge branch 'x86/cache' into perf/core, to pick up fixes 2018-10-23 12:30:19 +02:00
intel_rdt_rdtgroup.c x86/intel_rdt: Prevent pseudo-locking from using stale pointers 2018-10-19 14:54:28 +02:00
intel_rdt.c x86/intel_rdt: Prevent pseudo-locking from using stale pointers 2018-10-19 14:54:28 +02:00
intel_rdt.h x86/intel_rdt: Fix out-of-bounds memory access in CBM tests 2018-10-09 08:02:15 +02:00
intel.c x86/spectre: Add missing family 6 check to microcode check 2018-08-27 10:29:14 +02:00
Makefile x86/cpu: Create Hygon Dhyana architecture support file 2018-09-27 16:14:05 +02:00
match.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mkcapflags.sh License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mshyperv.c x86/hyper-v: Enable PIT shutdown quirk 2018-11-04 11:04:46 +01:00
perfctr-watchdog.c x86/events: Add Hygon Dhyana support to PMU infrastructure 2018-09-27 18:28:57 +02:00
powerflags.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
proc.c x86/cpu: Change type of x86_cache_size variable to unsigned int 2018-02-15 01:15:53 +01:00
rdrand.c x86, asm: Use CC_SET()/CC_OUT() and static_cpu_has() in archrandom.h 2016-06-08 12:41:20 -07:00
scattered.c Merge branch 'x86/hyperv' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-02-01 15:04:17 +01:00
topology.c x86/cpu/topology: Provide detect_extended_topology_early() 2018-06-21 14:20:59 +02:00
transmeta.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
umc.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vmware.c x86/cpu/vmware: Do not trace vmware_sched_clock() 2018-11-09 21:39:14 +01:00