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It's not safe to use the aux vect inside __uClibc_main if we are running
with shared libraries, because it could have been already modified.
For example, if some constructor plays with environment variables by
using unsetenv, the modifications done into the stack to unset an
environment variable, have impacts on the aux vect due to the extra NULL
entries added.
Due to this, __uClibc_main is not able to detect where the aux vect
starts, so all the entries that are used by __uClibc_main (AT_UID,
AT_EUID, AT_GID, AT_EGID, AT_PAGESZ and possibly other arch specific)
are impacted.
Same side effect on the aux vect is caused by the ld.so when running a
SUID program with some of the unsecure environment variables set, that
will be unset by the ld.so itself.
In order to fix this issue, it needs to handle aux vect entries into
__uClibc_main only if SHARED is not defined.
In SHARED case, libc refers to __dl_secure and _dl_pagesize as initialised
by the ld.so where the aux vext is still untouched.
Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com>
Reviewed-by: Carmelo Amoroso <carmelo.amoroso@st.com>
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
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Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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This adds support for DSBT ELF to ld.so. This uses loadmaps like FD-PIC.
Some code is added in ld.so to initialize the DSBT tables, and there's
also a new target macro FINISH_BOOTSTRAP_RELOC.
Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Aurelien Jacquiot <a-jacquiot@ti.com>
Signed-off-by: Bernd Schmidt <bernds@codesourcery.com>
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Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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This patch will convert all the #ifdef USE_TLS and #if USE_TLS to
#if defined(USE_TLS) && USE_TLS.
By checking if the USE_TLS is defined before checking its value will result in
correct behavior for architectures not defining this config symbol.
Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>
Acked-by: Carmelo AMOROSO <carmelo.amoroso@st.com>
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Signed-off-by: Austin Foxley <austinf@cetoncorp.com>
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Handle O=
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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The dlpi_addr isn't a simple Elf_Addr type for FDPIC systems, so we can't
just assign 0 to it to initialize.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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If an arch (like alpha and others) have no ldso support at all, then there
is no point in attempting to walk loaded modules in the dl-* helper funcs.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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This cuts down on a lot of noise from gcc-4.4
Signed-off-by: Ron Lee <ron@debian.org>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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Currently we have an implementation in ld.so and libdl.a.
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
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