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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, Will Deacon <will@kernel.org>,
	Szabolcs Nagy <szabolcs.nagy@arm.com>,
	Vincenzo Frascino <vincenzo.frascino@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>
Subject: [PATCH 5.4 56/57] arm64: vdso: Add -fasynchronous-unwind-tables to cflags
Date: Mon,  4 May 2020 19:58:00 +0200	[thread overview]
Message-ID: <20200504165501.735355046@linuxfoundation.org> (raw)
In-Reply-To: <20200504165456.783676004@linuxfoundation.org>

From: Vincenzo Frascino <vincenzo.frascino@arm.com>

commit 1578e5d03112e3e9d37e1c4d95b6dfb734c73955 upstream.

On arm64 linux gcc uses -fasynchronous-unwind-tables -funwind-tables
by default since gcc-8, so now the de facto platform ABI is to allow
unwinding from async signal handlers.

However on bare metal targets (aarch64-none-elf), and on old gcc,
async and sync unwind tables are not enabled by default to avoid
runtime memory costs.

This means if linux is built with a baremetal toolchain the vdso.so
may not have unwind tables which breaks the gcc platform ABI guarantee
in userspace.

Add -fasynchronous-unwind-tables explicitly to the vgettimeofday.o
cflags to address the ABI change.

Fixes: 28b1a824a4f4 ("arm64: vdso: Substitute gettimeofday() with C implementation")
Cc: Will Deacon <will@kernel.org>
Reported-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arm64/kernel/vdso/Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm64/kernel/vdso/Makefile
+++ b/arch/arm64/kernel/vdso/Makefile
@@ -32,7 +32,7 @@ UBSAN_SANITIZE			:= n
 OBJECT_FILES_NON_STANDARD	:= y
 KCOV_INSTRUMENT			:= n
 
-CFLAGS_vgettimeofday.o = -O2 -mcmodel=tiny
+CFLAGS_vgettimeofday.o = -O2 -mcmodel=tiny -fasynchronous-unwind-tables
 
 ifneq ($(c-gettimeofday-y),)
   CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)



  parent reply	other threads:[~2020-05-04 18:10 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-04 17:57 [PATCH 5.4 00/57] 5.4.39-rc1 review Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 01/57] dma-buf: Fix SET_NAME ioctl uapi Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 02/57] drm/edid: Fix off-by-one in DispID DTD pixel clock Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 03/57] drm/amd/display: Fix green screen issue after suspend Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 04/57] drm/qxl: qxl_release leak in qxl_draw_dirty_fb() Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 05/57] drm/qxl: qxl_release leak in qxl_hw_surface_alloc() Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 06/57] drm/qxl: qxl_release use after free Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 07/57] NFSv4.1: fix handling of backchannel binding in BIND_CONN_TO_SESSION Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 08/57] btrfs: fix transaction leak in btrfs_recover_relocation Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 09/57] btrfs: fix block group leak when removing fails Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 10/57] btrfs: fix partial loss of prealloc extent past i_size after fsync Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 11/57] btrfs: transaction: Avoid deadlock due to bad initialization timing of fs_info::journal_info Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 12/57] mmc: cqhci: Avoid false "cqhci: CQE stuck on" by not open-coding timeout loop Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 13/57] mmc: sdhci-xenon: fix annoying 1.8V regulator warning Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 14/57] mmc: sdhci-pci: Fix eMMC driver strength for BYT-based controllers Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 15/57] mmc: sdhci-msm: Enable host capabilities pertains to R1b response Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 16/57] mmc: meson-mx-sdio: Set MMC_CAP_WAIT_WHILE_BUSY Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 17/57] mmc: meson-mx-sdio: remove the broken ->card_busy() op Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 18/57] crypto: caam - fix the address of the last entry of S/G Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 19/57] ALSA: hda/realtek - Two front mics on a Lenovo ThinkCenter Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 20/57] ALSA: usb-audio: Correct a typo of NuPrime DAC-10 USB ID Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 21/57] ALSA: hda/hdmi: fix without unlocked before return Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 22/57] ALSA: line6: Fix POD HD500 audio playback Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 23/57] ALSA: pcm: oss: Place the plugin buffer overflow checks correctly Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 24/57] i2c: amd-mp2-pci: Fix Oops in amd_mp2_pci_init() error handling Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 25/57] Drivers: hv: vmbus: Fix Suspend-to-Idle for Generation-2 VM Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 26/57] dlmfs_file_write(): fix the bogosity in handling non-zero *ppos Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 27/57] IB/rdmavt: Always return ERR_PTR from rvt_create_mmap_info() Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 28/57] PM: ACPI: Output correct message on target power state Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 29/57] PM: hibernate: Freeze kernel threads in software_resume() Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 30/57] dm verity fec: fix hash block number in verity_fec_decode Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 31/57] dm writecache: fix data corruption when reloading the target Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 32/57] dm multipath: use updated MPATHF_QUEUE_IO on mapping for bio-based mpath Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 33/57] ARM: dts: imx6qdl-sr-som-ti: indicate powering off wifi is safe Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 34/57] scsi: qla2xxx: set UNLOADING before waiting for session deletion Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 35/57] scsi: qla2xxx: check UNLOADING before posting async work Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 36/57] RDMA/mlx5: Set GRH fields in query QP on RoCE Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 37/57] RDMA/mlx4: Initialize ib_spec on the stack Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 38/57] RDMA/siw: Fix potential siw_mem refcnt leak in siw_fastreg_mr() Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 39/57] RDMA/core: Prevent mixed use of FDs between shared ufiles Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 40/57] RDMA/core: Fix race between destroy and release FD object Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 41/57] RDMA/cm: Fix ordering of xa_alloc_cyclic() in ib_create_cm_id() Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 42/57] RDMA/cm: Fix an error check in cm_alloc_id_priv() Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 43/57] i2c: iproc: generate stop event for slave writes Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 44/57] vfio: avoid possible overflow in vfio_iommu_type1_pin_pages Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 45/57] vfio/type1: Fix VA->PA translation for PFNMAP VMAs in vaddr_get_pfn() Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 46/57] iommu/qcom: Fix local_base status check Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 47/57] scsi: target/iblock: fix WRITE SAME zeroing Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 48/57] iommu/amd: Fix legacy interrupt remapping for x2APIC-enabled system Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 49/57] i2c: aspeed: Avoid i2c interrupt status clear race condition Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 50/57] ALSA: opti9xx: shut up gcc-10 range warning Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 51/57] Fix use after free in get_tree_bdev() Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 52/57] nvme: prevent double free in nvme_alloc_ns() error handling Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 53/57] nfs: Fix potential posix_acl refcnt leak in nfs3_set_acl Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 54/57] dmaengine: dmatest: Fix iteration non-stop logic Greg Kroah-Hartman
2020-05-04 17:57 ` [PATCH 5.4 55/57] dmaengine: dmatest: Fix process hang when reading wait parameter Greg Kroah-Hartman
2020-05-04 17:58 ` Greg Kroah-Hartman [this message]
2020-05-04 17:58 ` [PATCH 5.4 57/57] selinux: properly handle multiple messages in selinux_netlink_send() Greg Kroah-Hartman
2020-05-05  8:38 ` [PATCH 5.4 00/57] 5.4.39-rc1 review Jon Hunter
2020-05-05 15:19 ` Naresh Kamboju
2020-05-05 15:43 ` Guenter Roeck
2020-05-05 15:44 ` shuah

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