Unable to init binreloc with ld >= 2.31
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Key: CORE-5955
URL: http://tracker.firebirdsql.org/browse/CORE-5955
Project: Firebird Core
Issue Type: Bug
Environment: Libux binaried built with ld >=2.31
Reporter: Roman Simakov
See
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=blob_plain;f=ld/NEWS;hb=refs/tags/binutils-2_31
for 2.31
*Add a configure option --enable-separate-code to decide whether
-z separate-code should be enabled in ELF linker by default. Default
to yes for Linux/x86 targets. Note that -z separate-code can increase
disk and memory size.
Now -z separate-code linker option is default and in /proc/self/maps we can
find 6 sections for libfbclient.so
7ffff7b8d000-7ffff7c0f000 r--p 00000000 08:15 52957347
/home/roman/prj/RedDatabase/red-database/gen/Debug/firebird/lib/libfbclient.so.4.0.0
7ffff7c0f000-7ffff7da8000 r-xp 00082000 08:15 52957347
/home/roman/prj/RedDatabase/red-database/gen/Debug/firebird/lib/libfbclient.so.4.0.0
7ffff7da8000-7ffff7f83000 r--p 0021b000 08:15 52957347
/home/roman/prj/RedDatabase/red-database/gen/Debug/firebird/lib/libfbclient.so.4.0.0
7ffff7f83000-7ffff7f84000 ---p 003f6000 08:15 52957347
/home/roman/prj/RedDatabase/red-database/gen/Debug/firebird/lib/libfbclient.so.4.0.0
7ffff7f84000-7ffff7fbc000 r--p 003f6000 08:15 52957347
/home/roman/prj/RedDatabase/red-database/gen/Debug/firebird/lib/libfbclient.so.4.0.0
7ffff7fbc000-7ffff7fbe000 rw-p 0042e000 08:15 52957347
/home/roman/prj/RedDatabase/red-database/gen/Debug/firebird/lib/libfbclient.so.4.0.0
Previosly we could find 4. Now "r-xp" pages contains ONLY instructions. Any
data moved to separate pages "a--p".
7f8ef3f04000-7f8ef42f9000 r-xp 00000000 08:15 52957337
/home/roman/prj/RedDatabase/red-database/gen/Debug/firebird/lib/libfbclient.so.4.0.0
7f8ef42f9000-7f8ef42fa000 ---p 003f5000 08:15 52957337
/home/roman/prj/RedDatabase/red-database/gen/Debug/firebird/lib/libfbclient.so.4.0.0
7f8ef42fa000-7f8ef4332000 r--p 003f5000 08:15 52957337
/home/roman/prj/RedDatabase/red-database/gen/Debug/firebird/lib/libfbclient.so.4.0.0
7f8ef4332000-7f8ef4334000 rw-p 0042d000 08:15 52957337
/home/roman/prj/RedDatabase/red-database/gen/Debug/firebird/lib/libfbclient.so.4.0.0
binreloc library skip any lines of /proc/self/maps except "a-xp" and it's a
bug. It tries to find an address of empty constant string "" and supposes it
will be allocated at the same page as instructions. Starting from ld 2.31 it's
not so by default. We need to conider r--p sections as well.
A simpthom is "Missing master config file firebird.conf" if you try to run
server without installation.
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