From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Arnd Bergmann <arnd@arndb.de>,
Paolo Bonzini <pbonzini@redhat.com>,
Sasha Levin <sashal@kernel.org>,
kvm@vger.kernel.org, clang-built-linux@googlegroups.com
Subject: [PATCH AUTOSEL 5.2 43/85] x86: kvm: avoid constant-conversion warning
Date: Fri, 26 Jul 2019 09:38:53 -0400 [thread overview]
Message-ID: <20190726133936.11177-43-sashal@kernel.org> (raw)
In-Reply-To: <20190726133936.11177-1-sashal@kernel.org>
From: Arnd Bergmann <arnd@arndb.de>
[ Upstream commit a6a6d3b1f867d34ba5bd61aa7bb056b48ca67cff ]
clang finds a contruct suspicious that converts an unsigned
character to a signed integer and back, causing an overflow:
arch/x86/kvm/mmu.c:4605:39: error: implicit conversion from 'int' to 'u8' (aka 'unsigned char') changes value from -205 to 51 [-Werror,-Wconstant-conversion]
u8 wf = (pfec & PFERR_WRITE_MASK) ? ~w : 0;
~~ ^~
arch/x86/kvm/mmu.c:4607:38: error: implicit conversion from 'int' to 'u8' (aka 'unsigned char') changes value from -241 to 15 [-Werror,-Wconstant-conversion]
u8 uf = (pfec & PFERR_USER_MASK) ? ~u : 0;
~~ ^~
arch/x86/kvm/mmu.c:4609:39: error: implicit conversion from 'int' to 'u8' (aka 'unsigned char') changes value from -171 to 85 [-Werror,-Wconstant-conversion]
u8 ff = (pfec & PFERR_FETCH_MASK) ? ~x : 0;
~~ ^~
Add an explicit cast to tell clang that everything works as
intended here.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://github.com/ClangBuiltLinux/linux/issues/95
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/x86/kvm/mmu.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 98f6e4f88b04..8d95c81b2c82 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -4593,11 +4593,11 @@ static void update_permission_bitmask(struct kvm_vcpu *vcpu,
*/
/* Faults from writes to non-writable pages */
- u8 wf = (pfec & PFERR_WRITE_MASK) ? ~w : 0;
+ u8 wf = (pfec & PFERR_WRITE_MASK) ? (u8)~w : 0;
/* Faults from user mode accesses to supervisor pages */
- u8 uf = (pfec & PFERR_USER_MASK) ? ~u : 0;
+ u8 uf = (pfec & PFERR_USER_MASK) ? (u8)~u : 0;
/* Faults from fetches of non-executable pages*/
- u8 ff = (pfec & PFERR_FETCH_MASK) ? ~x : 0;
+ u8 ff = (pfec & PFERR_FETCH_MASK) ? (u8)~x : 0;
/* Faults from kernel mode fetches of user pages */
u8 smepf = 0;
/* Faults from kernel mode accesses of user pages */
--
2.20.1
next prev parent reply other threads:[~2019-07-26 13:40 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-26 13:38 [PATCH AUTOSEL 5.2 01/85] ARM: riscpc: fix DMA Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 02/85] ARM: dts: rockchip: Make rk3288-veyron-minnie run at hs200 Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 03/85] ARM: dts: rockchip: Make rk3288-veyron-mickey's emmc work again Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 04/85] clk: meson: mpll: properly handle spread spectrum Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 05/85] ARM: dts: rockchip: Mark that the rk3288 timer might stop in suspend Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 06/85] ftrace: Enable trampoline when rec count returns back to one Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 07/85] arm64: dts: qcom: qcs404-evb: fix l3 min voltage Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 08/85] soc: qcom: rpmpd: fixup rpmpd set performance state Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 09/85] arm64: dts: marvell: mcbin: enlarge PCI memory window Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 10/85] soc: imx: soc-imx8: Correct return value of error handle Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 11/85] dmaengine: tegra-apb: Error out if DMA_PREP_INTERRUPT flag is unset Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 12/85] arm64: dts: rockchip: fix isp iommu clocks and power domain Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 13/85] kernel/module.c: Only return -EEXIST for modules that have finished loading Sasha Levin
2019-07-26 13:46 ` Prarit Bhargava
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 14/85] PCI: OF: Initialize dev->fwnode appropriately Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 15/85] firmware/psci: psci_checker: Park kthreads before stopping them Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 16/85] soc: imx8: Fix potential kernel dump in error path Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 17/85] arm64: qcom: qcs404: Add reset-cells to GCC node Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 18/85] swiotlb: fix phys_addr_t overflow warning Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 19/85] MIPS: lantiq: Fix bitfield masking Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 20/85] dmaengine: rcar-dmac: Reject zero-length slave DMA requests Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 21/85] ARM: exynos: Only build MCPM support if used Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 22/85] clk: tegra210: fix PLLU and PLLU_OUT1 Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 23/85] fs/adfs: super: fix use-after-free bug Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 24/85] clk: sprd: Add check for return value of sprd_clk_regmap_init() Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 25/85] arm64: dts: rockchip: Fix USB3 Type-C on rk3399-sapphire Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 26/85] btrfs: tree-checker: Check if the file extent end overflows Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 27/85] btrfs: fix minimum number of chunk errors for DUP Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 28/85] btrfs: Flush before reflinking any extent to prevent NOCOW write falling back to COW without data reservation Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 29/85] remoteproc: copy parent dma_pfn_offset for vdev Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 30/85] btrfs: qgroup: Don't hold qgroup_ioctl_lock in btrfs_qgroup_inherit() Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 31/85] cifs: Fix a race condition with cifs_echo_request Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 32/85] ceph: fix listxattr vxattr buffer length calculation Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 33/85] ceph: fix improper use of smp_mb__before_atomic() Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 34/85] ceph: fix dir_lease_is_valid() Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 35/85] ceph: return -ERANGE if virtual xattr value didn't fit in buffer Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 36/85] virtio-mmio: add error check for platform_get_irq Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 37/85] ACPI: blacklist: fix clang warning for unused DMI table Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 38/85] scsi: zfcp: fix GCC compiler warning emitted with -Wmaybe-uninitialized Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 39/85] selftests/bpf: do not ignore clang failures Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 40/85] drm/amd/display: Expose audio inst from DC to DM Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 41/85] cifs: fix crash in cifs_dfs_do_automount Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 42/85] perf version: Fix segfault due to missing OPT_END() Sasha Levin
2019-07-26 13:38 ` Sasha Levin [this message]
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 44/85] ACPI: fix false-positive -Wuninitialized warning Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 45/85] ISDN: hfcsusb: checking idx of ep configuration Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 46/85] KVM: nVMX: Ignore segment base for VMX memory operand when segment not FS or GS Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 47/85] bpf: fix BTF verifier size resolution logic Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 48/85] libbpf: fix another GCC8 warning for strncpy Sasha Levin
2019-07-26 13:38 ` [PATCH AUTOSEL 5.2 49/85] be2net: Signal that the device cannot transmit during reconfiguration Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 50/85] mm/z3fold: don't try to use buddy slots after free Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 51/85] mm/slab_common.c: work around clang bug #42570 Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 52/85] mm/memcontrol.c: keep local VM counters in sync with the hierarchical ones Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 53/85] mm/z3fold.c: reinitialize zhdr structs after migration Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 54/85] x86/apic: Silence -Wtype-limits compiler warnings Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 55/85] x86: math-emu: Hide clang warnings for 16-bit overflow Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 56/85] mm/cma.c: fail if fixed declaration can't be honored Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 57/85] lib/test_overflow.c: avoid tainting the kernel and fix wrap size Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 58/85] lib/test_string.c: avoid masking memset16/32/64 failures Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 59/85] mm/ioremap: check virtual address alignment while creating huge mappings Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 60/85] coda: add error handling for fget Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 61/85] coda: fix build using bare-metal toolchain Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 62/85] uapi linux/coda_psdev.h: move upc_req definition from uapi to kernel side headers Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 63/85] drivers/rapidio/devices/rio_mport_cdev.c: NUL terminate some strings Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 64/85] drivers/pps/pps.c: clear offset flags in PPS_SETPARAMS ioctl Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 65/85] ipc/mqueue.c: only perform resource calculation if user valid Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 66/85] nds32: fix asm/syscall.h Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 67/85] device-dax: fix memory and resource leak if hotplug fails Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 68/85] mm/hotplug: make remove_memory() interface usable Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 69/85] floppy: fix div-by-zero in setup_format_params Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 70/85] floppy: fix out-of-bounds read in copy_buffer Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 71/85] mlxsw: spectrum_dcb: Configure DSCP map as the last rule is removed Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 72/85] stacktrace: Force USER_DS for stack_trace_save_user() Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 73/85] crypto: ccp - Fix SEV_VERSION_GREATER_OR_EQUAL Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 74/85] xen: let alloc_xenballooned_pages() fail if not enough memory free Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 75/85] xen/pv: Fix a boot up hang revealed by int3 self test Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 76/85] x86/uaccess: Remove ELF function annotation from copy_user_handle_tail() Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 77/85] objtool: Add mcsafe_handle_tail() to the uaccess safe list Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 78/85] x86/kvm: Don't call kvm_spurious_fault() from .fixup Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 79/85] x86/paravirt: Fix callee-saved function ELF sizes Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 80/85] bnxt_en: Fix VNIC accounting when enabling aRFS on 57500 chips Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 81/85] x86, boot: Remove multiple copy of static function sanitize_boot_params() Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 82/85] bpf: Disable GCC -fgcse optimization for ___bpf_prog_run() Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 83/85] drm/nouveau: fix memory leak in nouveau_conn_reset() Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 84/85] dma-direct: correct the physical addr in dma_direct_sync_sg_for_cpu/device Sasha Levin
2019-07-26 13:39 ` [PATCH AUTOSEL 5.2 85/85] drm/nouveau/dmem: missing mutex_lock in error path Sasha Levin
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