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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2019-11-29 10:44:59 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2020-01-03 11:22:07 -0300 |
| commit | 1bdda52fe92fd01b424cd6fbb63e3df96a95015c (patch) | |
| tree | d25214e63bf5c96ab48c11ec0df28b5d96ca99da /sysdeps/unix/sysv/linux/sysdep-vdso.h | |
| parent | 57013650f7e796428ac2c0b7512757e99327bfc9 (diff) | |
| download | glibc-1bdda52fe92fd01b424cd6fbb63e3df96a95015c.tar glibc-1bdda52fe92fd01b424cd6fbb63e3df96a95015c.tar.gz glibc-1bdda52fe92fd01b424cd6fbb63e3df96a95015c.tar.bz2 glibc-1bdda52fe92fd01b424cd6fbb63e3df96a95015c.zip | |
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 <siddhesh@sourceware.org>
Diffstat (limited to 'sysdeps/unix/sysv/linux/sysdep-vdso.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/sysdep-vdso.h | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/sysdeps/unix/sysv/linux/sysdep-vdso.h b/sysdeps/unix/sysv/linux/sysdep-vdso.h index f0cc384d78..dc6eaddbbf 100644 --- a/sysdeps/unix/sysv/linux/sysdep-vdso.h +++ b/sysdeps/unix/sysv/linux/sysdep-vdso.h @@ -19,8 +19,7 @@ #ifndef SYSDEP_VDSO_LINUX_H # define SYSDEP_VDSO_LINUX_H -#include <dl-vdso.h> -#include <libc-vdso.h> +#include <ldsodefs.h> #ifndef INTERNAL_VSYSCALL_CALL # define INTERNAL_VSYSCALL_CALL(funcptr, err, nr, args...) \ @@ -34,8 +33,7 @@ INTERNAL_SYSCALL_DECL (sc_err); \ long int sc_ret; \ \ - __typeof (__vdso_##name) vdsop = __vdso_##name; \ - PTR_DEMANGLE (vdsop); \ + __typeof (GLRO(dl_vdso_##name)) vdsop = GLRO(dl_vdso_##name); \ if (vdsop != NULL) \ { \ sc_ret = INTERNAL_VSYSCALL_CALL (vdsop, sc_err, nr, ##args); \ |