lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Thu, 30 May 2019 15:15:17 +0100 From: Vincenzo Frascino <vincenzo.frascino@....com> To: linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org, linux-kselftest@...r.kernel.org Cc: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will.deacon@....com>, Arnd Bergmann <arnd@...db.de>, Russell King <linux@...linux.org.uk>, Ralf Baechle <ralf@...ux-mips.org>, Paul Burton <paul.burton@...s.com>, Daniel Lezcano <daniel.lezcano@...aro.org>, Thomas Gleixner <tglx@...utronix.de>, Mark Salyzyn <salyzyn@...roid.com>, Peter Collingbourne <pcc@...gle.com>, Shuah Khan <shuah@...nel.org>, Dmitry Safonov <0x7f454c46@...il.com>, Rasmus Villemoes <linux@...musvillemoes.dk>, Huw Davies <huw@...eweavers.com>, Mark Salyzyn <salyzyn@...gle.com> Subject: [PATCH v6 05/19] arm64: Build vDSO with -ffixed-x18 From: Peter Collingbourne <pcc@...gle.com> The vDSO needs to be build with x18 reserved in order to accommodate userspace platform ABIs built on top of Linux that use the register to carry inter-procedural state, as provided for by the AAPCS. An example of such a platform ABI is the one that will be used by an upcoming version of Android. Although this change is currently a no-op due to the fact that the vDSO is currently implemented in pure assembly on arm64, it is necessary in order to prepare for another change [1] that will add C code to the vDSO. [1] https://patchwork.kernel.org/patch/10044501/ Signed-off-by: Peter Collingbourne <pcc@...gle.com> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com> Cc: Mark Salyzyn <salyzyn@...gle.com> Cc: Will Deacon <will.deacon@....com> Cc: linux-arm-kernel@...ts.infradead.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 00bcfd2672cf..d98230f70caf 100644 --- a/arch/arm64/kernel/vdso/Makefile +++ b/arch/arm64/kernel/vdso/Makefile @@ -20,7 +20,7 @@ obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) ldflags-y := -shared -nostdlib -soname=linux-vdso.so.1 --hash-style=sysv \ --build-id -n -T -ccflags-y := -fno-common -fno-builtin -fno-stack-protector +ccflags-y := -fno-common -fno-builtin -fno-stack-protector -ffixed-x18 ccflags-y += -DDISABLE_BRANCH_PROFILING VDSO_LDFLAGS := -Bsymbolic -- 2.21.0
Powered by blists - more mailing lists