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| author | Sami Tolvanen <samitolvanen@google.com> | 2022-09-08 23:54:58 +0200 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2022-09-26 19:13:15 +0200 |
| commit | 5141d3a06b2da1731ac82091298b766a1f95d3d8 (patch) | |
| tree | 94633d84a24c8e49b2e38318d6735dfaf01c672b | |
| parent | treewide: Drop __cficanonical (diff) | |
| download | linux-5141d3a06b2da1731ac82091298b766a1f95d3d8.tar.xz linux-5141d3a06b2da1731ac82091298b766a1f95d3d8.zip | |
objtool: Preserve special st_shndx indexes in elf_update_symbol
elf_update_symbol fails to preserve the special st_shndx values
between [SHN_LORESERVE, SHN_HIRESERVE], which results in it
converting SHN_ABS entries into SHN_UNDEF, for example. Explicitly
check for the special indexes and ensure these symbols are not
marked undefined.
Fixes: ead165fa1042 ("objtool: Fix symbol creation")
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220908215504.3686827-17-samitolvanen@google.com
| -rw-r--r-- | tools/objtool/elf.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c index c25e957c1e52..7e24b09b1163 100644 --- a/tools/objtool/elf.c +++ b/tools/objtool/elf.c @@ -619,6 +619,11 @@ static int elf_update_symbol(struct elf *elf, struct section *symtab, Elf64_Xword entsize = symtab->sh.sh_entsize; int max_idx, idx = sym->idx; Elf_Scn *s, *t = NULL; + bool is_special_shndx = sym->sym.st_shndx >= SHN_LORESERVE && + sym->sym.st_shndx != SHN_XINDEX; + + if (is_special_shndx) + shndx = sym->sym.st_shndx; s = elf_getscn(elf->elf, symtab->idx); if (!s) { @@ -704,7 +709,7 @@ static int elf_update_symbol(struct elf *elf, struct section *symtab, } /* setup extended section index magic and write the symbol */ - if (shndx >= SHN_UNDEF && shndx < SHN_LORESERVE) { + if ((shndx >= SHN_UNDEF && shndx < SHN_LORESERVE) || is_special_shndx) { sym->sym.st_shndx = shndx; if (!shndx_data) shndx = 0; |