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056fc1c0e3
The audit symbind callback is not called for binaries built with
-Wl,-z,now or when LD_BIND_NOW=1 is used, nor the PLT tracking callbacks
(plt_enter and plt_exit) since this would change the expected
program semantics (where no PLT is expected) and would have performance
implications (such as for BZ#15533).
LAV_CURRENT is also bumped to indicate the audit ABI change (where
la_symbind flags are set by the loader to indicate no possible PLT
trace).
To handle powerpc64 ELFv1 function descriptor, _dl_audit_symbind
requires to know whether bind-now is used so the symbol value is
updated to function text segment instead of the OPD (for lazy binding
this is done by PPC64_LOAD_FUNCPTR on _dl_runtime_resolve).
Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu,
powerpc64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
(cherry picked from commit 32612615c5)
Resolved conflicts:
NEWS - Manual merge.
40 lines
1.6 KiB
C
40 lines
1.6 KiB
C
/* Configuration of lookup functions. PowerPC version.
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Copyright (C) 2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#define DL_FIXUP_VALUE_TYPE ElfW(Addr)
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#define DL_FIXUP_MAKE_VALUE(map, addr) (addr)
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#define DL_FIXUP_VALUE_CODE_ADDR(value) (value)
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#define DL_FIXUP_VALUE_ADDR(value) (value)
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#define DL_FIXUP_ADDR_VALUE(addr) (addr)
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#if __WORDSIZE == 64 && _CALL_ELF == 1
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/* We need to correctly set the audit modules value for bind-now. */
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# define DL_FIXUP_BINDNOW_ADDR_VALUE(addr) \
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(((Elf64_FuncDesc *)(addr))->fd_func)
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# define DL_FIXUP_BINDNOW_RELOC(value, new_value, st_value) \
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({ \
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Elf64_FuncDesc *opd = (Elf64_FuncDesc *) (value); \
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opd->fd_func = (st_value); \
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if ((new_value) != (uintptr_t) (st_value)) \
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opd->fd_toc = ((Elf64_FuncDesc *)(new_value))->fd_toc; \
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})
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#else
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# define DL_FIXUP_BINDNOW_ADDR_VALUE(addr) (addr)
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# define DL_FIXUP_BINDNOW_RELOC(value, new_value, st_value) \
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(*value) = st_value;
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#endif
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