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This does not describe how to use RTLD_DI_ORIGIN and l_name
to reconstruct a full path for the an object. The reason
is that I think we should not recommend further use of
RTLD_DI_ORIGIN due to its buffer overflow potential (bug 24298).
This should be covered by another dlinfo extension. It would
also obsolete the need for the dladdr approach to obtain
the file name for the main executable.
Obtaining the lowest address from load segments in program
headers is quite clumsy and should be provided directly
via dlinfo.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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The current toolchain does not consistently generate it, and
glibc does not use it.
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
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This new section in the manual provides recommendations for
use of glibc in environments with higher integrity requirements.
It's reflecting both current implementation shortcomings, and
challenges we inherit from ELF and psABI requirements.
Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
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This prints some information from struct cpu_features, and the midr_el1
and dczid_el0 system register contents on every CPU.
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
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This is surprisingly difficult to implement if the goal is to produce
reasonably sized output. With the current approaches to output
compression (suppressing zeros and repeated results between CPUs,
folding ranges of identical subleaves, dealing with the %ecx
reflection issue), the output is less than 600 KiB even for systems
with 256 logical CPUs.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
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And shorten the section/node names a bit, so that the menu
entries become easier to read.
Texinfo 6.5 fails to process the previous structure:
./dynlink.texi:56: warning: node `Dynamic Linker Introspection' is
next for `Dynamic Linker Diagnostics' in sectioning but not in menu
./dynlink.texi:56: warning: node up `Dynamic Linker Diagnostics'
in menu `Dynamic Linker Invocation' and
in sectioning `Dynamic Linker' differ
./dynlink.texi:1: node `Dynamic Linker' lacks menu item for
`Dynamic Linker Diagnostics' despite being its Up target
./dynlink.texi:226: warning: node prev `Dynamic Linker Introspection' in menu `Dynamic Linker Invocation'
and in sectioning `Dynamic Linker Diagnostics' differ
Texinfo 7.0.2 does not report an error.
This fixes commit f21962ddfc8bb23e92597da1f98e313dbde11cc1
("manual: Document ld.so --list-diagnostics output").
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
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Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Signed-off-by: Bert Wesarg <bert.wesarg@googlemail.com>
Reviewed-by: Florian Weimer <fweimer@redhat.com>
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The information is theoretically available via dl_iterate_phdr as
well, but that approach is very slow if there are many shared
objects.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@rehdat.com>
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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@rehdat.com>
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It can be used to speed up the libgcc unwinder, and the internal
_dl_find_dso_for_object function (which is used for caller
identification in dlopen and related functions, and in dladdr).
_dl_find_object is in the internal namespace due to bug 28503.
If libgcc switches to _dl_find_object, this namespace issue will
be fixed. It is located in libc for two reasons: it is necessary
to forward the call to the static libc after static dlopen, and
there is a link ordering issue with -static-libgcc and libgcc_eh.a
because libc.so is not a linker script that includes ld.so in the
glibc build tree (so that GCC's internal -lc after libgcc_eh.a does
not pick up ld.so).
It is necessary to do the i386 customization in the
sysdeps/x86/bits/dl_find_object.h header shared with x86-64 because
otherwise, multilib installations are broken.
The implementation uses software transactional memory, as suggested
by Torvald Riegel. Two copies of the supporting data structures are
used, also achieving full async-signal-safety.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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