Hi Marcus,
I accidentally pushed the changes and now get following build error:
libc/misc/internals/__uClibc_main.c: In function '__uClibc_main':
libc/misc/internals/__uClibc_main.c:424:10: error: '_dl_auxvt' undeclared
(first use in this function); did you mean '_dl_aux_init'?
424 | if ((_dl_auxvt[AT_UID].a_un.a_val == (size_t)-1 && __check_suid())
||
| ^~~~~~~~~
| _dl_aux_init
libc/misc/internals/__uClibc_main.c:424:10: note: each undeclared identifier is
reported only once for each function it appears in
gmake[6]: *** [Makerules:373: libc/misc/internals/__uClibc_main.os] Error 1
gmake[5]: *** [Makefile:353:
/home/wbx/embedded-test/openadk/toolchain_build_qemu-aarch64_uclibc-ng_cortex_a53/w-uClibc-ng-1.0.51-1/uClibc-ng-1.0.51/.compiled]
Error 2
gmake[4]: *** [Makefile:106: uclibc-ng-compile] Error 2
gmake[3]: *** [mk/build.mk:229: toolchain/final] Error 2
gmake[2]: *** [/home/wbx/embedded-test/openadk/mk/build.mk:174: world] Error 2
gmake[1]: *** [Makefile.adk:25: all] Error 2
make: *** [Makefile:22: all] Error 2
build failed
wbx@helium:~/embedded-test$
Any idea why it fails for me and not for you?
Targeting aarch64 with uClibc-ng master.
best regards
Waldemar
Marcus Haehnel wrote,
> From: Georg Kotheimer <georg.kothei...@kernkonzept.com>
>
> While for dynamic linking the _dl_auxvt array is provided in
> dl-startup.c as part of the ldso, is was undefined for statically
> linked binaries. This resulted in a corresponding linker error if
> a statically linked program used getauxval.
>
> To provide _dl_auxvt also for statically linked binaries, a definition
> of _dl_auxvt is added to dl-support.c and initialized by _dl_aux_init().
>
> Signed-off-by: Marcus Haehnel <marcus.haeh...@kernkonzept.com>
> ---
> libc/misc/elf/dl-support.c | 16 +++++++++++++---
> libc/misc/internals/__uClibc_main.c | 22 ++++++----------------
> 2 files changed, 19 insertions(+), 19 deletions(-)
>
> diff --git a/libc/misc/elf/dl-support.c b/libc/misc/elf/dl-support.c
> index 87cd1bb72..81c78fa55 100644
> --- a/libc/misc/elf/dl-support.c
> +++ b/libc/misc/elf/dl-support.c
> @@ -12,6 +12,7 @@
> */
>
> #include <link.h>
> +#include <ldso.h>
> #include <elf.h>
> #if defined(USE_TLS) && USE_TLS
> #include <assert.h>
> @@ -31,17 +32,26 @@ ElfW(Phdr) *_dl_phdr;
> size_t _dl_phnum;
> size_t _dl_pagesize;
>
> +ElfW(auxv_t) _dl_auxvt[AUX_MAX_AT_ID];
> +
> void internal_function _dl_aux_init (ElfW(auxv_t) *av);
> void internal_function _dl_aux_init (ElfW(auxv_t) *av)
> {
> + memset(_dl_auxvt, 0x00, sizeof(_dl_auxvt));
> + for (; av->a_type != AT_NULL; av++)
> + {
> + if (av->a_type < AUX_MAX_AT_ID)
> + _dl_auxvt[av->a_type] = *av;
> + }
> +
> /* Get the program headers base address from the aux vect */
> - _dl_phdr = (ElfW(Phdr) *) av[AT_PHDR].a_un.a_val;
> + _dl_phdr = (ElfW(Phdr) *) _dl_auxvt[AT_PHDR].a_un.a_val;
>
> /* Get the number of program headers from the aux vect */
> - _dl_phnum = (size_t) av[AT_PHNUM].a_un.a_val;
> + _dl_phnum = (size_t) _dl_auxvt[AT_PHNUM].a_un.a_val;
>
> /* Get the pagesize from the aux vect */
> - _dl_pagesize = (av[AT_PAGESZ].a_un.a_val) ? (size_t)
> av[AT_PAGESZ].a_un.a_val : PAGE_SIZE;
> + _dl_pagesize = (_dl_auxvt[AT_PAGESZ].a_un.a_val) ? (size_t)
> _dl_auxvt[AT_PAGESZ].a_un.a_val : PAGE_SIZE;
> }
>
> #if defined(USE_TLS) && USE_TLS
> diff --git a/libc/misc/internals/__uClibc_main.c
> b/libc/misc/internals/__uClibc_main.c
> index 64a9c8214..a84492248 100644
> --- a/libc/misc/internals/__uClibc_main.c
> +++ b/libc/misc/internals/__uClibc_main.c
> @@ -43,7 +43,7 @@
> /* Are we in a secure process environment or are we dealing
> * with setuid stuff? If we are dynamically linked, then we
> * already have _dl_secure, otherwise we need to re-examine
> - * auxvt[] below.
> + * _dl_auxvt[] below.
> */
> int _pe_secure = 0;
> libc_hidden_data_def(_pe_secure)
> @@ -373,7 +373,6 @@ void __uClibc_main(int (*main)(int, char **, char **),
> int argc,
> {
> #ifndef SHARED
> unsigned long *aux_dat;
> - ElfW(auxv_t) auxvt[AT_EGID + 1];
> #endif
>
> #ifdef __UCLIBC_HAS_THREADS_NATIVE__
> @@ -399,23 +398,14 @@ void __uClibc_main(int (*main)(int, char **, char **),
> int argc,
>
> #ifndef SHARED
> /* Pull stuff from the ELF header when possible */
> - memset(auxvt, 0x00, sizeof(auxvt));
> aux_dat = (unsigned long*)__environ;
> while (*aux_dat) {
> aux_dat++;
> }
> aux_dat++;
> - while (*aux_dat) {
> - ElfW(auxv_t) *auxv_entry = (ElfW(auxv_t) *) aux_dat;
> - if (auxv_entry->a_type <= AT_EGID) {
> - memcpy(&(auxvt[auxv_entry->a_type]), auxv_entry,
> sizeof(ElfW(auxv_t)));
> - }
> - aux_dat += 2;
> - }
> /* Get the program headers (_dl_phdr) from the aux vector
> It will be used into __libc_setup_tls. */
> -
> - _dl_aux_init (auxvt);
> + _dl_aux_init ((ElfW(auxv_t) *)aux_dat);
> #endif
>
> /* We need to initialize uClibc. If we are dynamically linked this
> @@ -431,10 +421,10 @@ void __uClibc_main(int (*main)(int, char **, char **),
> int argc,
> #ifndef SHARED
> /* Prevent starting SUID binaries where the stdin. stdout, and
> * stderr file descriptors are not already opened. */
> - if ((auxvt[AT_UID].a_un.a_val == (size_t)-1 && __check_suid()) ||
> - (auxvt[AT_UID].a_un.a_val != (size_t)-1 &&
> - (auxvt[AT_UID].a_un.a_val != auxvt[AT_EUID].a_un.a_val ||
> - auxvt[AT_GID].a_un.a_val != auxvt[AT_EGID].a_un.a_val)))
> + if ((_dl_auxvt[AT_UID].a_un.a_val == (size_t)-1 && __check_suid()) ||
> + (_dl_auxvt[AT_UID].a_un.a_val != (size_t)-1 &&
> + (_dl_auxvt[AT_UID].a_un.a_val != _dl_auxvt[AT_EUID].a_un.a_val ||
> + _dl_auxvt[AT_GID].a_un.a_val != _dl_auxvt[AT_EGID].a_un.a_val)))
> #else
> if (_dl_secure)
> #endif
> --
> 2.47.1
>
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