From: Ye Bin <yebin10@huawei.com> ohos inclusion category: bugfix issue: #I3ZXZF CVE: NA ----------------------------------------------- When we configure CONFIG_RANDOMIZE_BASE we find that: [XX]$arm-linux-gnueabihf-readelf -s ./arch/arm/vdso/vdso.so Symbol table '.dynsym' contains 5 entries: Num: Value Size Type Bind Vis Ndx Name 0: 00000000 0 NOTYPE LOCAL DEFAULT UND 1: 00000278 0 SECTION LOCAL DEFAULT 8 2: 00000000 0 OBJECT GLOBAL DEFAULT ABS LINUX_2.6 We can't find __vdso_gettimeofday and __vdso_clock_gettime symbol. So call clock_gettime and gettimeofday will call system call. This results in performance degradation. Signed-off-by: Ye Bin <yebin10@huawei.com> Reviewed-by: Jason Yan <yanaijie@huawei.com> Signed-off-by: yangerkun <yangerkun@huawei.com> Signed-off-by: Cui GaoSheng <cuigaosheng1@huawei.com> Reviewed-by: Xiu Jianfeng <xiujianfeng@huawei.com> Signed-off-by: Chen Jun <chenjun102@huawei.com> Signed-off-by: Yu Changchun <yuchangchun1@huawei.com> --- arch/arm/vdso/vgettimeofday.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/arm/vdso/vgettimeofday.c b/arch/arm/vdso/vgettimeofday.c index 1976c6f325a4..425e4f2458ec 100644 --- a/arch/arm/vdso/vgettimeofday.c +++ b/arch/arm/vdso/vgettimeofday.c @@ -4,6 +4,11 @@ * * Copyright 2015 Mentor Graphics Corporation. */ + +#ifdef CONFIG_RANDOMIZE_BASE +#pragma GCC visibility pop +#endif + #include <linux/time.h> #include <linux/types.h> -- 2.22.0