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41d6f74e6c
With commit f0b2132b35248c1f4a80f62a2c38cddcc802aa8c ("ld.so:
Support moving versioned symbols between sonames [BZ #24741]"), the
dynamic linker will find the definition of vfork in libc and binds
a vfork reference to that symbol, even if the soname in the version
reference says that the symbol should be located in libpthread.
As a result, the forwarder (whether it's IFUNC-based or a duplicate
of the libc implementation) is no longer necessary.
On older architectures, a placeholder symbol is required, to make sure
that the GLIBC_2.1.2 symbol version does not go away, or is turned in
to a weak symbol definition by the link editor. (The symbol version
needs to preserved so that the symbol coverage check in
elf/dl-version.c does not fail for old binaries.)
mips32 is an outlier: It defined __vfork@@GLIBC_2.2, but the
baseline is GLIBC_2.0. Since there are other @@GLIBC_2.2 symbols,
the placeholder symbol is not needed there.
24 lines
731 B
Plaintext
24 lines
731 B
Plaintext
# See scripts/check-localplt.awk for how this file is processed.
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# PLT use is required for the malloc family and for matherr because
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# users can define their own functions and have library internals call them.
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libc.so: calloc
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libc.so: free
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libc.so: malloc
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libc.so: memalign
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libc.so: realloc
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libc.so: __sigsetjmp
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libc.so: _IO_funlockfile
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libc.so: __errno_location
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libm.so: matherr
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# The main malloc is interposed into the dynamic linker, for
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# allocations after the initial link (when dlopen is used).
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ld.so: malloc
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ld.so: calloc
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ld.so: realloc
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ld.so: free
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# The TLS-enabled version of these functions is interposed from libc.so.
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ld.so: _dl_signal_error
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ld.so: _dl_catch_error
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ld.so: _dl_signal_exception
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ld.so: _dl_catch_exception
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