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/dev/zero is meant for reading zeroes. /dev/null is for writing into
nirvana.
Signed-off-by: Ulf Hermann <ulf.hermann@qt.io>
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elf[32|64]_updatenull would sanity check the e_type before allowing to
update the phdrs. This prevents creating an ET_REL file with phdrs. It
also prevents creating any vendor specific ELF file having phdrs. We
only check this when updating/writing out the file. But we would just
read such files. Don't prevent people from creating unexpected ELF files.
elflint will warn for such files.
While writing a new testcase for this another bug was found that
prevented updating a just created phdr because elf_getphdrnum would
sanity check the phdr offset in the file (which doesn't exist yet).
Fix that by only doing such a sanity check if the phdrs haven't been
read in or created yet.
This second bug should have been found by the existing elfshphehdr
test, but that test contained a typo checking elf_getphdrnum.
It tested that the called failed when there were no phdrs, but then
elf_getphdrnum should simply succeed and return zero.
https://bugzilla.redhat.com/show_bug.cgi?id=1352232
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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Some older compilers warn about a function and argument name being equal.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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When e_version is EV_NONE we should set it to EV_CURRENT like we do for
the EI_VERSION and like we set EI_DATA to the correct byte order when set
to ELFDATANONE. Likewise we should always set e_shentsize like we do for
e_phentsize, not just when ELF_F_LAYOUT isn't set.
Add a new elfshphehdr testcase to check the above.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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