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a23bb79479
In case of shared builds the symbol can be represented in multiple
shared objects, and so if one SO contains _end symbol firstly, then it
it's address can subtracted from the symbol from another SO, and this
give overflow.
Here is an example of such symbol:
$ llvm-readelf -a programs/server/libclickhouse-server-libd.so | fgrep schemata_sql
552: 000000000010b869 0 NOTYPE GLOBAL DEFAULT 22 _binary_schemata_sql_size
1271: 000000000010b869 0 NOTYPE GLOBAL DEFAULT 22 _binary_schemata_sql_end
3627: 000000000010b480 0 NOTYPE GLOBAL DEFAULT 22 _binary_schemata_sql_start
5822: 000000000010b869 0 NOTYPE GLOBAL DEFAULT 22 _binary_schemata_sql_end
5828: 000000000010b869 0 NOTYPE GLOBAL DEFAULT 22 _binary_schemata_sql_size
5831: 000000000010b480 0 NOTYPE GLOBAL DEFAULT 22 _binary_schemata_sql_start
$ llvm-readelf -W -a src/TableFunctions/libclickhouse_table_functionsd.* | fgrep schemata_sql
1709: 00000000001fc5a1 0 NOTYPE GLOBAL DEFAULT 22 _binary_schemata_sql_end
5107: 00000000001fc5a1 0 NOTYPE GLOBAL DEFAULT 22 _binary_schemata_sql_size
6090: 00000000001fc1b8 0 NOTYPE GLOBAL DEFAULT 22 _binary_schemata_sql_start
10975: 00000000001fc1b8 0 NOTYPE GLOBAL DEFAULT 22 _binary_schemata_sql_start
10976: 00000000001fc5a1 0 NOTYPE GLOBAL DEFAULT 22 _binary_schemata_sql_end
10977: 00000000001fc5a1 0 NOTYPE GLOBAL DEFAULT 22 _binary_schemata_sql_size
To address this, add base address of the Elf into the resources to
compare with.
Follow-up for: #33134 (cc @alexey-milovidov)
93 lines
2.5 KiB
C++
93 lines
2.5 KiB
C++
#pragma once
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#if defined(__ELF__) && !defined(__FreeBSD__)
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#include <vector>
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#include <string>
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#include <unordered_map>
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#include <Common/Elf.h>
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#include <boost/noncopyable.hpp>
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#include <Common/MultiVersion.h>
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namespace DB
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{
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/** Allow to quickly find symbol name from address.
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* Used as a replacement for "dladdr" function which is extremely slow.
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* It works better than "dladdr" because it also allows to search private symbols, that are not participated in shared linking.
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*/
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class SymbolIndex : private boost::noncopyable
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{
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protected:
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SymbolIndex() { update(); }
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public:
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static MultiVersion<SymbolIndex>::Version instance();
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static void reload();
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struct Symbol
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{
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const void * address_begin;
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const void * address_end;
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const char * name;
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};
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struct Object
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{
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const void * address_begin;
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const void * address_end;
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std::string name;
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std::shared_ptr<Elf> elf;
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};
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/// Address in virtual memory should be passed. These addresses include offset where the object is loaded in memory.
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const Symbol * findSymbol(const void * address) const;
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const Object * findObject(const void * address) const;
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const std::vector<Symbol> & symbols() const { return data.symbols; }
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const std::vector<Object> & objects() const { return data.objects; }
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std::string_view getResource(String name) const
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{
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if (auto it = data.resources.find(name); it != data.resources.end())
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return it->second.data;
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return {};
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}
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/// The BuildID that is generated by compiler.
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String getBuildID() const { return data.build_id; }
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String getBuildIDHex() const;
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struct ResourcesBlob
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{
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/// Symbol can be presented in multiple shared objects,
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/// base_address will be used to compare only symbols from the same SO.
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ElfW(Addr) base_address;
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/// Just a human name of the SO.
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std::string_view object_name;
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/// Data blob.
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std::string_view data;
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};
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using Resources = std::unordered_map<std::string_view /* symbol name */, ResourcesBlob>;
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struct Data
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{
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std::vector<Symbol> symbols;
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std::vector<Object> objects;
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String build_id;
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/// Resources (embedded binary data) are located by symbols in form of _binary_name_start and _binary_name_end.
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Resources resources;
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};
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private:
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Data data;
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void update();
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static MultiVersion<SymbolIndex> & instanceImpl();
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};
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}
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#endif
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