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kpatch/kpatch-build/lookup.h

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merge add-patches-section functionality into create-obj-diff In preparation for dynamic symbol linking, the symbol lookup logic is going to move into create-diff-obj anyway. We might as well minimize the code duplication and pull this into create-diff-obj. This avoids having to re-parse the ELF file modify it in-place. Signed-off-by: Seth Jennings <sjenning@redhat.com> Conflicts: kpatch-build/kpatch-build
2014-05-14 20:43:58 +00:00
#ifndef _LOOKUP_H_
#define _LOOKUP_H_
struct lookup_table;
struct lookup_result {
unsigned long value;
unsigned long size;
livepatch-patch-hook: add support for livepatch sympos Support patching objects that have duplicated function names. This feature was introduced upstream in Linux v4.5. This patch appends the symbol position to the symbol structure when lookup_local_symbol is called. This pos variable is then used when creating the funcs and dynrelas sections. Finally, incorporate sympos into the livepatch patch hook only if the kernel version is greater than v4.5. In other cases the older format is used. Fixes: #493 Signed-off-by: Chris J Arges <chris.j.arges@canonical.com>
2016-02-11 17:27:12 +00:00
unsigned long pos;
merge add-patches-section functionality into create-obj-diff In preparation for dynamic symbol linking, the symbol lookup logic is going to move into create-diff-obj anyway. We might as well minimize the code duplication and pull this into create-diff-obj. This avoids having to re-parse the ELF file modify it in-place. Signed-off-by: Seth Jennings <sjenning@redhat.com> Conflicts: kpatch-build/kpatch-build
2014-05-14 20:43:58 +00:00
};
support dup file+symbol We use kelf_base->symbols to find a unique matching FILE+locals combination when we call lookup_open(). If we can't find one matching or we find more than one matching, we error out. If we find a unique one, we setup table->local_syms in lookup_open(), so later lookup_local_symbol() could do its lookup based on table->local_syms. Fixes #604. Suggested-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Zhou Chengming <zhouchengming1@huawei.com>
2017-02-04 01:31:25 +00:00
struct sym_compare_type {
char *name;
int type;
};
kpatch-build: use symbol table instead of kobject create-diff-object doesn't really need the full kernel object file as input. All it requires is a symbol table. Switch to using "eu-readelf -s"'s output instead of object files. This will enable us to cover more cases in unit tests. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Artem Savkov <asavkov@redhat.com>
2018-05-11 09:51:00 +00:00
struct lookup_table *lookup_open(char *symtab_path, char *symvers_path,
support dup file+symbol We use kelf_base->symbols to find a unique matching FILE+locals combination when we call lookup_open(). If we can't find one matching or we find more than one matching, we error out. If we find a unique one, we setup table->local_syms in lookup_open(), so later lookup_local_symbol() could do its lookup based on table->local_syms. Fixes #604. Suggested-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Zhou Chengming <zhouchengming1@huawei.com>
2017-02-04 01:31:25 +00:00
char *hint, struct sym_compare_type *locals);
merge add-patches-section functionality into create-obj-diff In preparation for dynamic symbol linking, the symbol lookup logic is going to move into create-diff-obj anyway. We might as well minimize the code duplication and pull this into create-diff-obj. This avoids having to re-parse the ELF file modify it in-place. Signed-off-by: Seth Jennings <sjenning@redhat.com> Conflicts: kpatch-build/kpatch-build
2014-05-14 20:43:58 +00:00
void lookup_close(struct lookup_table *table);
support dup file+symbol We use kelf_base->symbols to find a unique matching FILE+locals combination when we call lookup_open(). If we can't find one matching or we find more than one matching, we error out. If we find a unique one, we setup table->local_syms in lookup_open(), so later lookup_local_symbol() could do its lookup based on table->local_syms. Fixes #604. Suggested-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Zhou Chengming <zhouchengming1@huawei.com>
2017-02-04 01:31:25 +00:00
int lookup_local_symbol(struct lookup_table *table, char *name,
merge add-patches-section functionality into create-obj-diff In preparation for dynamic symbol linking, the symbol lookup logic is going to move into create-diff-obj anyway. We might as well minimize the code duplication and pull this into create-diff-obj. This avoids having to re-parse the ELF file modify it in-place. Signed-off-by: Seth Jennings <sjenning@redhat.com> Conflicts: kpatch-build/kpatch-build
2014-05-14 20:43:58 +00:00
struct lookup_result *result);
int lookup_global_symbol(struct lookup_table *table, char *name,
struct lookup_result *result);
int lookup_is_exported_symbol(struct lookup_table *table, char *name);
lookup: parse Module.symvers in lookup_open() Have lookup_open() also parse Module.symvers and add the resulting symbols and their objnames to the lookup table. This code was essentially cherry-picked from Josh Poimboeuf's lookup code found here: https://github.com/jpoimboe/kpatch/commit/8cdca59c8844505bcf40b59b5c5050b03e974fea That patch was modified to fix a bug in obj_read() (calling elf_end() without strdup'ing the symbol name strings, which was causing null dereferences) and to fix up the module name after reading it from Module.symvers (replacing '-' with '_' and stripping the path prefixes). Also, add lookup_exported_symbol_objname(), which looks up the objname of an exported symbol by making use of the objname information obtained from Module.symvers.
2017-01-23 20:43:12 +00:00
char *lookup_exported_symbol_objname(struct lookup_table *table, char *name);
merge add-patches-section functionality into create-obj-diff In preparation for dynamic symbol linking, the symbol lookup logic is going to move into create-diff-obj anyway. We might as well minimize the code duplication and pull this into create-diff-obj. This avoids having to re-parse the ELF file modify it in-place. Signed-off-by: Seth Jennings <sjenning@redhat.com> Conflicts: kpatch-build/kpatch-build
2014-05-14 20:43:58 +00:00
#endif /* _LOOKUP_H_ */