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| author | Paul Burton <paul.burton@mips.com> | 2017-12-12 09:57:47 +0000 |
|---|---|---|
| committer | Paul Burton <paul.burton@mips.com> | 2018-07-27 19:36:16 -0700 |
| commit | 351fdddd366245c0fb4636f32edfb4198c8d6b8c (patch) | |
| tree | f38034c7a4bdb213123e550302e04e3e3f4c2324 /arch/mips | |
| parent | 24babe69d7ff8d3845fac49b741b7257fb03f906 (diff) | |
| download | linux-stable-351fdddd366245c0fb4636f32edfb4198c8d6b8c.tar.gz linux-stable-351fdddd366245c0fb4636f32edfb4198c8d6b8c.tar.bz2 linux-stable-351fdddd366245c0fb4636f32edfb4198c8d6b8c.zip | |
MIPS: VDSO: Prevent use of smp_processor_id()
VDSO code should not be using smp_processor_id(), since it is executed
in user mode.
Introduce a VDSO-specific path which will cause a compile-time
or link-time error (depending upon support for __compiletime_error) if
the VDSO ever incorrectly attempts to use smp_processor_id().
[Matt Redfearn <matt.redfearn@imgtec.com>: Move before change to
smp_processor_id in series]
Signed-off-by: Paul Burton <paul.burton@mips.com>
Signed-off-by: Matt Redfearn <matt.redfearn@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/17932/
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@linux-mips.org
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/include/asm/smp.h | 12 | ||||
| -rw-r--r-- | arch/mips/vdso/Makefile | 3 |
2 files changed, 13 insertions, 2 deletions
diff --git a/arch/mips/include/asm/smp.h b/arch/mips/include/asm/smp.h index 88ebd83b3bf9..056a6bf13491 100644 --- a/arch/mips/include/asm/smp.h +++ b/arch/mips/include/asm/smp.h @@ -25,7 +25,17 @@ extern cpumask_t cpu_sibling_map[]; extern cpumask_t cpu_core_map[]; extern cpumask_t cpu_foreign_map[]; -#define raw_smp_processor_id() (current_thread_info()->cpu) +static inline int raw_smp_processor_id(void) +{ +#if defined(__VDSO__) + extern int vdso_smp_processor_id(void) + __compiletime_error("VDSO should not call smp_processor_id()"); + return vdso_smp_processor_id(); +#else + return current_thread_info()->cpu; +#endif +} +#define raw_smp_processor_id raw_smp_processor_id /* Map from cpu id to sequential logical cpu number. This will only not be idempotent when cpus failed to come on-line. */ diff --git a/arch/mips/vdso/Makefile b/arch/mips/vdso/Makefile index ce196046ac3e..477c463c89ec 100644 --- a/arch/mips/vdso/Makefile +++ b/arch/mips/vdso/Makefile @@ -7,7 +7,8 @@ ccflags-vdso := \ $(filter -I%,$(KBUILD_CFLAGS)) \ $(filter -E%,$(KBUILD_CFLAGS)) \ $(filter -mmicromips,$(KBUILD_CFLAGS)) \ - $(filter -march=%,$(KBUILD_CFLAGS)) + $(filter -march=%,$(KBUILD_CFLAGS)) \ + -D__VDSO__ cflags-vdso := $(ccflags-vdso) \ $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \ -O2 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \ |