kernel/linux.git/arch, branch v4.14.58

powerpc/powernv: Fix save/restore of SPRG3 on entry/exit from stop (idle)

2018-07-25T09:25:11+00:00

commit b03897cf318dfc47de33a7ecbc7655584266f034 upstream. On 64-bit servers, SPRN_SPRG3 and its userspace read-only mirror SPRN_USPRG3 are used as userspace VDSO write and read registers respectively. SPRN_SPRG3 is lost when we enter stop4 and above, and is currently not restored. As a result, any read from SPRN_USPRG3 returns zero on an exit from stop4 (Power9 only) and above. Thus in this situation, on POWER9, any call from sched_getcpu() always returns zero, as on powerpc, we call __kernel_getcpu() which relies upon SPRN_USPRG3 to report the CPU and NUMA node information. Fix this by restoring SPRN_SPRG3 on wake up from a deep stop state with the sprg_vdso value that is cached in PACA. Fixes: e1c1cfed5432 ("powerpc/powernv: Save/Restore additional SPRs for stop4 cpuidle") Cc: stable@vger.kernel.org # v4.14+ Reported-by: Florian Weimer Signed-off-by: Gautham R. Shenoy Reviewed-by: Michael Ellerman Signed-off-by: Michael Ellerman Signed-off-by: Greg Kroah-Hartman

alpha: fix osf_wait4() breakage

2018-07-25T09:25:11+00:00

commit f88a333b44318643282b8acc92af90deda441f5e upstream. kernel_wait4() expects a userland address for status - it's only rusage that goes as a kernel one (and needs a copyout afterwards) [ Also, fix the prototype of kernel_wait4() to have that __user annotation - Linus ] Fixes: 92ebce5ac55d ("osf_wait4: switch to kernel_wait4()") Cc: stable@kernel.org # v4.13+ Signed-off-by: Al Viro Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman

ARC: mm: allow mprotect to make stack mappings executable

2018-07-25T09:25:08+00:00

commit 93312b6da4df31e4102ce5420e6217135a16c7ea upstream. mprotect(EXEC) was failing for stack mappings as default vm flags was missing MAYEXEC. This was triggered by glibc test suite nptl/tst-execstack testcase What is surprising is that despite running LTP for years on, we didn't catch this issue as it lacks a directed test case. gcc dejagnu tests with nested functions also requiring exec stack work fine though because they rely on the GNU_STACK segment spit out by compiler and handled in kernel elf loader. This glibc case is different as the stack is non exec to begin with and a dlopen of shared lib with GNU_STACK segment triggers the exec stack proceedings using a mprotect(PROT_EXEC) which was broken. CC: stable@vger.kernel.org Signed-off-by: Vineet Gupta Signed-off-by: Greg Kroah-Hartman

ARC: configs: Remove CONFIG_INITRAMFS_SOURCE from defconfigs

2018-07-25T09:25:08+00:00

commit 64234961c145606b36eaa82c47b11be842b21049 upstream. We used to have pre-set CONFIG_INITRAMFS_SOURCE with local path to intramfs in ARC defconfigs. This was quite convenient for in-house development but not that convenient for newcomers who obviusly don't have folders like "arc_initramfs" next to the Linux source tree. Which leads to quite surprising failure of defconfig building: ------------------------------->8----------------------------- ../scripts/gen_initramfs_list.sh: Cannot open '../../arc_initramfs_hs/' ../usr/Makefile:57: recipe for target 'usr/initramfs_data.cpio.gz' failed make[2]: *** [usr/initramfs_data.cpio.gz] Error 1 ------------------------------->8----------------------------- So now when more and more people start to deal with our defconfigs let's make their life easier with removal of CONFIG_INITRAMFS_SOURCE. Signed-off-by: Alexey Brodkin Cc: Kevin Hilman Cc: stable@vger.kernel.org Signed-off-by: Alexey Brodkin Signed-off-by: Vineet Gupta Signed-off-by: Greg Kroah-Hartman

ARC: Fix CONFIG_SWAP

2018-07-25T09:25:07+00:00

commit 6e3761145a9ba3ce267c330b6bff51cf6a057b06 upstream. swap was broken on ARC due to silly copy-paste issue. We encode offset from swapcache page in __swp_entry() as (off << 13) but were not decoding back in __swp_offset() as (off >> 13) - it was still (off << 13). This finally fixes swap usage on ARC. | # mkswap /dev/sda2 | | # swapon -a -e /dev/sda2 | Adding 500728k swap on /dev/sda2. Priority:-2 extents:1 across:500728k | | # free | total used free shared buffers cached | Mem: 765104 13456 751648 4736 8 4736 | -/+ buffers/cache: 8712 756392 | Swap: 500728 0 500728 Cc: stable@vger.kernel.org Signed-off-by: Alexey Brodkin Signed-off-by: Vineet Gupta Signed-off-by: Greg Kroah-Hartman

ARCv2: [plat-hsdk]: Save accl reg pair by default

2018-07-25T09:25:07+00:00

commit af1fc5baa724c63ce1733dfcf855bad5ef6078e3 upstream. This manifsted as strace segfaulting on HSDK because gcc was targetting the accumulator registers as GPRs, which kernek was not saving/restoring by default. Cc: stable@vger.kernel.org #4.14+ Signed-off-by: Vineet Gupta Signed-off-by: Greg Kroah-Hartman

x86/MCE: Remove min interval polling limitation

2018-07-25T09:25:07+00:00

commit fbdb328c6bae0a7c78d75734a738b66b86dffc96 upstream. commit b3b7c4795c ("x86/MCE: Serialize sysfs changes") introduced a min interval limitation when setting the check interval for polled MCEs. However, the logic is that 0 disables polling for corrected MCEs, see Documentation/x86/x86_64/machinecheck. The limitation prevents disabling. Remove this limitation and allow the value 0 to disable polling again. Fixes: b3b7c4795c ("x86/MCE: Serialize sysfs changes") Signed-off-by: Dewet Thibaut Signed-off-by: Alexander Sverdlin [ Massage commit message. ] Signed-off-by: Borislav Petkov Signed-off-by: Thomas Gleixner Cc: Tony Luck Cc: linux-edac Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/20180716084927.24869-1-alexander.sverdlin@nokia.com Signed-off-by: Greg Kroah-Hartman

x86/events/intel/ds: Fix bts_interrupt_threshold alignment

2018-07-25T09:25:07+00:00

commit 2c991e408df6a407476dbc453d725e1e975479e7 upstream. Markus reported that BTS is sporadically missing the tail of the trace in the perf_event data buffer: [decode error (1): instruction overflow] shown in GDB; and bisected it to the conversion of debug_store to PTI. A little "optimization" crept into alloc_bts_buffer(), which mistakenly placed bts_interrupt_threshold away from the 24-byte record boundary. Intel SDM Vol 3B 17.4.9 says "This address must point to an offset from the BTS buffer base that is a multiple of the BTS record size." Revert "max" from a byte count to a record count, to calculate the bts_interrupt_threshold correctly: which turns out to fix problem seen. Fixes: c1961a4631da ("x86/events/intel/ds: Map debug buffers in cpu_entry_area") Reported-and-tested-by: Markus T Metzger Signed-off-by: Hugh Dickins Signed-off-by: Thomas Gleixner Cc: Peter Zijlstra Cc: Arnaldo Carvalho de Melo Cc: Alexander Shishkin Cc: Andi Kleen Cc: Dave Hansen Cc: Stephane Eranian Cc: stable@vger.kernel.org # v4.14+ Link: https://lkml.kernel.org/r/alpine.LSU.2.11.1807141248290.1614@eggly.anvils Signed-off-by: Greg Kroah-Hartman

x86/apm: Don't access __preempt_count with zeroed fs

2018-07-25T09:25:07+00:00

commit 6f6060a5c9cc76fdbc22748264e6aa3779ec2427 upstream. APM_DO_POP_SEGS does not restore fs/gs which were zeroed by APM_DO_ZERO_SEGS. Trying to access __preempt_count with zeroed fs doesn't really work. Move the ibrs call outside the APM_DO_SAVE_SEGS/APM_DO_RESTORE_SEGS invocations so that fs is actually restored before calling preempt_enable(). Fixes the following sort of oopses: [ 0.313581] general protection fault: 0000 [#1] PREEMPT SMP [ 0.313803] Modules linked in: [ 0.314040] CPU: 0 PID: 268 Comm: kapmd Not tainted 4.16.0-rc1-triton-bisect-00090-gdd84441a7971 #19 [ 0.316161] EIP: __apm_bios_call_simple+0xc8/0x170 [ 0.316161] EFLAGS: 00210016 CPU: 0 [ 0.316161] EAX: 00000102 EBX: 00000000 ECX: 00000102 EDX: 00000000 [ 0.316161] ESI: 0000530e EDI: dea95f64 EBP: dea95f18 ESP: dea95ef0 [ 0.316161] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 [ 0.316161] CR0: 80050033 CR2: 00000000 CR3: 015d3000 CR4: 000006d0 [ 0.316161] Call Trace: [ 0.316161] ? cpumask_weight.constprop.15+0x20/0x20 [ 0.316161] on_cpu0+0x44/0x70 [ 0.316161] apm+0x54e/0x720 [ 0.316161] ? __switch_to_asm+0x26/0x40 [ 0.316161] ? __schedule+0x17d/0x590 [ 0.316161] kthread+0xc0/0xf0 [ 0.316161] ? proc_apm_show+0x150/0x150 [ 0.316161] ? kthread_create_worker_on_cpu+0x20/0x20 [ 0.316161] ret_from_fork+0x2e/0x38 [ 0.316161] Code: da 8e c2 8e e2 8e ea 57 55 2e ff 1d e0 bb 5d b1 0f 92 c3 5d 5f 07 1f 89 47 0c 90 8d b4 26 00 00 00 00 90 8d b4 26 00 00 00 00 90 <64> ff 0d 84 16 5c b1 74 7f 8b 45 dc 8e e0 8b 45 d8 8e e8 8b 45 [ 0.316161] EIP: __apm_bios_call_simple+0xc8/0x170 SS:ESP: 0068:dea95ef0 [ 0.316161] ---[ end trace 656253db2deaa12c ]--- Fixes: dd84441a7971 ("x86/speculation: Use IBRS if available before calling into firmware") Signed-off-by: Ville Syrjälä Signed-off-by: Thomas Gleixner Cc: stable@vger.kernel.org Cc: David Woodhouse Cc: "H. Peter Anvin" Cc: x86@kernel.org Cc: David Woodhouse Cc: "H. Peter Anvin" Link: https://lkml.kernel.org/r/20180709133534.5963-1-ville.syrjala@linux.intel.com Signed-off-by: Greg Kroah-Hartman

arm64: KVM: Add ARCH_WORKAROUND_2 discovery through ARCH_FEATURES_FUNC_ID

2018-07-22T12:28:52+00:00

commit 5d81f7dc9bca4f4963092433e27b508cbe524a32 upstream. Now that all our infrastructure is in place, let's expose the availability of ARCH_WORKAROUND_2 to guests. We take this opportunity to tidy up a couple of SMCCC constants. Acked-by: Christoffer Dall Reviewed-by: Mark Rutland Signed-off-by: Marc Zyngier Signed-off-by: Catalin Marinas Signed-off-by: Marc Zyngier Signed-off-by: Greg Kroah-Hartman