From 1bdda52fe92fd01b424cd6fbb63e3df96a95015c Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Date: Fri, 29 Nov 2019 10:44:59 -0300 Subject: elf: Move vDSO setup to rtld (BZ#24967) This patch moves the vDSO setup from libc to loader code, just after the vDSO link_map setup. For static case the initialization is moved to _dl_non_dynamic_init instead. Instead of using the mangled pointer, the vDSO data is set as attribute_relro (on _rtld_global_ro for shared or _dl_vdso_* for static). It is read-only even with partial relro. It fixes BZ#24967 now that the vDSO pointer is setup earlier than malloc interposition is called. Also, vDSO calls should not be a problem for static dlopen as indicated by BZ#20802. The vDSO pointer would be zero-initialized and the syscall will be issued instead. Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu, arm-linux-gnueabihf, powerpc64le-linux-gnu, powerpc64-linux-gnu, powerpc-linux-gnu, s390x-linux-gnu, sparc64-linux-gnu, and sparcv9-linux-gnu. I also run some tests on mips. Reviewed-by: Siddhesh Poyarekar --- sysdeps/powerpc/powerpc32/backtrace.c | 16 ++++++++-------- sysdeps/powerpc/powerpc64/backtrace.c | 8 ++++---- 2 files changed, 12 insertions(+), 12 deletions(-) (limited to 'sysdeps/powerpc') diff --git a/sysdeps/powerpc/powerpc32/backtrace.c b/sysdeps/powerpc/powerpc32/backtrace.c index 4a35588671..7c2d4726f8 100644 --- a/sysdeps/powerpc/powerpc32/backtrace.c +++ b/sysdeps/powerpc/powerpc32/backtrace.c @@ -51,14 +51,14 @@ struct signal_frame_32 { /* We don't care about the rest, since IP value is at 'mctx' field. */ }; -static inline int +static inline bool is_sigtramp_address (void *nip) { #ifdef HAVE_SIGTRAMP_RT32 - if (nip == VDSO_SYMBOL (sigtramp32)) - return 1; + if (nip == GLRO (dl_vdso_sigtramp_32)) + return true; #endif - return 0; + return false; } struct rt_signal_frame_32 { @@ -68,14 +68,14 @@ struct rt_signal_frame_32 { /* We don't care about the rest, since IP value is at 'uc' field. */ }; -static inline int +static inline bool is_sigtramp_address_rt (void * nip) { #ifdef HAVE_SIGTRAMP_32 - if (nip == VDSO_SYMBOL (sigtramp_rt32)) - return 1; + if (nip == GLRO (dl_vdso_sigtramp_rt32)) + return true; #endif - return 0; + return false; } int diff --git a/sysdeps/powerpc/powerpc64/backtrace.c b/sysdeps/powerpc/powerpc64/backtrace.c index ee8ba21f27..65c260ab76 100644 --- a/sysdeps/powerpc/powerpc64/backtrace.c +++ b/sysdeps/powerpc/powerpc64/backtrace.c @@ -54,14 +54,14 @@ struct signal_frame_64 { /* We don't care about the rest, since the IP value is at 'uc' field. */ }; -static inline int +static inline bool is_sigtramp_address (void *nip) { #ifdef HAVE_SIGTRAMP_RT64 - if (nip == VDSO_SYMBOL (sigtramp_rt64)) - return 1; + if (nip == GLRO (dl_vdso_sigtramp_rt64)) + return true; #endif - return 0; + return false; } int -- cgit 1.4.1