From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>,
Will Deacon <will@kernel.org>,
Szabolcs Nagy <szabolcs.nagy@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Sasha Levin <sashal@kernel.org>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH AUTOSEL 5.4 33/35] arm64: vdso: Add -fasynchronous-unwind-tables to cflags
Date: Thu, 7 May 2020 10:28:27 -0400 [thread overview]
Message-ID: <20200507142830.26239-33-sashal@kernel.org> (raw)
In-Reply-To: <20200507142830.26239-1-sashal@kernel.org>
From: Vincenzo Frascino <vincenzo.frascino@arm.com>
[ Upstream commit 1578e5d03112e3e9d37e1c4d95b6dfb734c73955 ]
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: Sasha Levin <sashal@kernel.org>
---
arch/arm64/kernel/vdso/Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile
index dd2514bb1511f..3862cad2410cf 100644
--- 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)
--
2.20.1
next prev parent reply other threads:[~2020-05-07 14:34 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-07 14:27 [PATCH AUTOSEL 5.4 01/35] RDMA/mlx4: Initialize ib_spec on the stack Sasha Levin
2020-05-07 14:27 ` [PATCH AUTOSEL 5.4 02/35] RDMA/siw: Fix potential siw_mem refcnt leak in siw_fastreg_mr() Sasha Levin
2020-05-07 14:27 ` [PATCH AUTOSEL 5.4 03/35] nfs: Fix potential posix_acl refcnt leak in nfs3_set_acl Sasha Levin
2020-05-07 14:27 ` [PATCH AUTOSEL 5.4 04/35] vfio: avoid possible overflow in vfio_iommu_type1_pin_pages Sasha Levin
2020-05-07 14:27 ` [PATCH AUTOSEL 5.4 05/35] riscv: fix vdso build with lld Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 06/35] scsi: qla2xxx: set UNLOADING before waiting for session deletion Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 07/35] scsi: qla2xxx: check UNLOADING before posting async work Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 08/35] scsi: target/iblock: fix WRITE SAME zeroing Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 09/35] RDMA/mlx5: Set GRH fields in query QP on RoCE Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 10/35] RDMA/core: Prevent mixed use of FDs between shared ufiles Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 11/35] dmaengine: pch_dma.c: Avoid data race between probe and irq handler Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 12/35] dmaengine: mmp_tdma: Do not ignore slave config validation errors Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 13/35] dmaengine: mmp_tdma: Reset channel error on release Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 14/35] vfio/type1: Fix VA->PA translation for PFNMAP VMAs in vaddr_get_pfn() Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 15/35] ALSA: hda: Match both PCI ID and SSID for driver blacklist Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 16/35] selftests/ftrace: Check the first record for kprobe_args_type.tc Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 17/35] RDMA/core: Fix race between destroy and release FD object Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 18/35] cpufreq: intel_pstate: Only mention the BIOS disabling turbo mode once Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 19/35] dma-buf: Fix SET_NAME ioctl uapi Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 20/35] nvme: prevent double free in nvme_alloc_ns() error handling Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 21/35] dmaengine: dmatest: Fix iteration non-stop logic Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 22/35] i2c: iproc: generate stop event for slave writes Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 23/35] ALSA: hda/hdmi: fix race in monitor detection during probe Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 24/35] dmaengine: dmatest: Fix process hang when reading 'wait' parameter Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 25/35] drm/amd/powerplay: avoid using pm_en before it is initialized revised Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 26/35] SUNRPC: defer slow parts of rpc_free_client() to a workqueue Sasha Levin
2020-05-07 21:18 ` NeilBrown
2020-05-16 23:10 ` Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 27/35] drm/amd/display: check if REFCLK_CNTL register is present Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 28/35] drm/amd/display: Update downspread percent to match spreadsheet for DCN2.1 Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 29/35] Fix use after free in get_tree_bdev() Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 30/35] drm/qxl: lost qxl_bo_kunmap_atomic_page in qxl_image_init_helper() Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 31/35] ALSA: opti9xx: shut up gcc-10 range warning Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 32/35] i2c: aspeed: Avoid i2c interrupt status clear race condition Sasha Levin
2020-05-07 14:28 ` Sasha Levin [this message]
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 34/35] iommu/amd: Fix legacy interrupt remapping for x2APIC-enabled system Sasha Levin
2020-05-07 14:28 ` [PATCH AUTOSEL 5.4 35/35] iommu/qcom: Fix local_base status check Sasha Levin
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