From: Peter Zijlstra peterz@infradead.org
stable inclusion from stable-v5.10.133 commit b37c439250118f6fecfd6436d8b218a452ab6fa8 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5PTAS CVE: CVE-2022-29900,CVE-2022-23816,CVE-2022-29901
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit d0c5c4cc73da0b05b0d9e5f833f2d859e1b45f8e upstream.
Have elf_add_reloc() create the relocation section implicitly.
Suggested-by: Josh Poimboeuf jpoimboe@redhat.com Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Signed-off-by: Borislav Petkov bp@suse.de Signed-off-by: Ingo Molnar mingo@kernel.org Reviewed-by: Miroslav Benes mbenes@suse.cz Link: https://lkml.kernel.org/r/20210326151259.880174448@infradead.org [bwh: Backported to 5.10: drop changes in create_mcount_loc_sections()] Signed-off-by: Ben Hutchings ben@decadent.org.uk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Lin Yujun linyujun809@huawei.com Reviewed-by: Zhang Jianhua chris.zjh@huawei.com --- tools/objtool/check.c | 3 --- tools/objtool/elf.c | 9 ++++++++- tools/objtool/elf.h | 1 - tools/objtool/orc_gen.c | 2 -- 4 files changed, 8 insertions(+), 7 deletions(-)
diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 76a63294d64e..2cb409859081 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -459,9 +459,6 @@ static int create_static_call_sections(struct objtool_file *file) if (!sec) return -1;
- if (!elf_create_reloc_section(file->elf, sec, SHT_RELA)) - return -1; - idx = 0; list_for_each_entry(insn, &file->static_call_list, static_call_node) {
diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c index 973f0c481bac..b76d687bc962 100644 --- a/tools/objtool/elf.c +++ b/tools/objtool/elf.c @@ -498,11 +498,18 @@ static int read_symbols(struct elf *elf) return -1; }
+static struct section *elf_create_reloc_section(struct elf *elf, + struct section *base, + int reltype); + int elf_add_reloc(struct elf *elf, struct section *sec, unsigned long offset, unsigned int type, struct symbol *sym, int addend) { struct reloc *reloc;
+ if (!sec->reloc && !elf_create_reloc_section(elf, sec, SHT_RELA)) + return -1; + reloc = malloc(sizeof(*reloc)); if (!reloc) { perror("malloc"); @@ -880,7 +887,7 @@ static struct section *elf_create_rela_reloc_section(struct elf *elf, struct sec return sec; }
-struct section *elf_create_reloc_section(struct elf *elf, +static struct section *elf_create_reloc_section(struct elf *elf, struct section *base, int reltype) { diff --git a/tools/objtool/elf.h b/tools/objtool/elf.h index 825ad326201d..463f329f1c66 100644 --- a/tools/objtool/elf.h +++ b/tools/objtool/elf.h @@ -122,7 +122,6 @@ static inline u32 reloc_hash(struct reloc *reloc)
struct elf *elf_open_read(const char *name, int flags); struct section *elf_create_section(struct elf *elf, const char *name, unsigned int sh_flags, size_t entsize, int nr); -struct section *elf_create_reloc_section(struct elf *elf, struct section *base, int reltype);
int elf_add_reloc(struct elf *elf, struct section *sec, unsigned long offset, unsigned int type, struct symbol *sym, int addend); diff --git a/tools/objtool/orc_gen.c b/tools/objtool/orc_gen.c index 57de202c51b4..671f3b296c1a 100644 --- a/tools/objtool/orc_gen.c +++ b/tools/objtool/orc_gen.c @@ -222,8 +222,6 @@ int orc_create(struct objtool_file *file) sec = elf_create_section(file->elf, ".orc_unwind_ip", 0, sizeof(int), nr); if (!sec) return -1; - if (!elf_create_reloc_section(file->elf, sec, SHT_RELA)) - return -1;
/* Write ORC entries to sections: */ list_for_each_entry(entry, &orc_list, list) {