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| author | Peter Zijlstra <peterz@infradead.org> | 2021-06-07 11:45:58 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-06-10 10:08:24 +0200 |
| commit | 584fd3b31889852d0d6f3dd1e3d8e9619b660d2c (patch) | |
| tree | 6343458bd05d3a2021ca0cdb3f62a13650dc01b2 /tools/objtool/arch/x86/decode.c | |
| parent | 614124bea77e452aa6df7a8714e8bc820b489922 (diff) | |
| download | lwn-584fd3b31889852d0d6f3dd1e3d8e9619b660d2c.tar.gz lwn-584fd3b31889852d0d6f3dd1e3d8e9619b660d2c.zip | |
objtool: Fix .symtab_shndx handling for elf_create_undef_symbol()
When an ELF object uses extended symbol section indexes (IOW it has a
.symtab_shndx section), these must be kept in sync with the regular
symbol table (.symtab).
So for every new symbol we emit, make sure to also emit a
.symtab_shndx value to keep the arrays of equal size.
Note: since we're writing an UNDEF symbol, most GElf_Sym fields will
be 0 and we can repurpose one (st_size) to host the 0 for the xshndx
value.
Fixes: 2f2f7e47f052 ("objtool: Add elf_create_undef_symbol()")
Reported-by: Nick Desaulniers <ndesaulniers@google.com>
Suggested-by: Fangrui Song <maskray@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Link: https://lkml.kernel.org/r/YL3q1qFO9QIRL/BA@hirez.programming.kicks-ass.net
Diffstat (limited to 'tools/objtool/arch/x86/decode.c')
0 files changed, 0 insertions, 0 deletions