Christian Brauner
8b12350b75
Switch all internal callers from the private ELF_NOTE_DLOPEN() macro to the new public SD_ELF_NOTE_DLOPEN() API from sd-dlopen.h, and remove the now-redundant macro definitions from dlfcn-util.h. Signed-off-by: Christian Brauner <brauner@kernel.org>
43 lines
1.9 KiB
C
43 lines
1.9 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include <dlfcn.h> /* IWYU pragma: export */
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#include "basic-forward.h"
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void* safe_dlclose(void *dl);
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static inline void dlclosep(void **dlp) {
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safe_dlclose(*dlp);
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}
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int dlopen_verbose(void **dlp, const char *filename);
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int dlsym_many_or_warn_sentinel(void *dl, int log_level, ...) _sentinel_;
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int dlopen_many_sym_or_warn_sentinel(void **dlp, const char *filename, int log_level, ...) _sentinel_;
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#define dlsym_many_or_warn(dl, log_level, ...) \
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dlsym_many_or_warn_sentinel(dl, log_level, __VA_ARGS__, NULL)
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#define dlopen_many_sym_or_warn(dlp, filename, log_level, ...) \
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dlopen_many_sym_or_warn_sentinel(dlp, filename, log_level, __VA_ARGS__, NULL)
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#define DLSYM_PROTOTYPE(symbol) \
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typeof(symbol)* sym_##symbol
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/* Macro useful for putting together variable/symbol name pairs when calling dlsym_many_or_warn(). Assumes
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* that each library symbol to resolve will be placed in a variable with the "sym_" prefix, i.e. a symbol
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* "foobar" is loaded into a variable "sym_foobar". */
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#define DLSYM_ARG(arg) \
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({ assert_cc(__builtin_types_compatible_p(typeof(sym_##arg), typeof(&arg))); &sym_##arg; }), STRINGIFY(arg)
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/* libbpf is a bit confused about type-safety and API compatibility. Provide a macro that can tape over that mess. Sad. */
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#define DLSYM_ARG_FORCE(arg) \
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&sym_##arg, STRINGIFY(arg)
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/* If called dlopen_many_sym_or_warn() will fail with EPERM. This can be used to block lazy loading of shared
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* libs, if we transfer a process into a different namespace. Note that this does not work for all calls of
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* dlopen(), just those through our dlopen_safe() wrapper (which we use comprehensively in our
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* codebase). This hence has *no* effect on NSS. (Would be great if we could change that...) */
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void block_dlopen(void);
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int dlopen_safe(const char *filename, void **ret, const char **reterr_dlerror);
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