[PATCH v4] recordmcount: Correct st_shndx handling
From: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Date: 2021-06-16 15:44:29
Also in:
linux-mediatek, lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
From: Peter Zijlstra <peterz@infradead.org> One should only use st_shndx when >SHN_UNDEF and <SHN_LORESERVE. When SHN_XINDEX, then use .symtab_shndx. Otherwise use 0. This handles the case: st_shndx >= SHN_LORESERVE && st_shndx != SHN_XINDEX. Reported-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com> [handle endianness of sym->st_shndx] Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com> --- scripts/recordmcount.h | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-)
diff --git a/scripts/recordmcount.h b/scripts/recordmcount.h
index f9b19524da11..1e9baa5c4fc6 100644
--- a/scripts/recordmcount.h
+++ b/scripts/recordmcount.h@@ -192,15 +192,20 @@ static unsigned int get_symindex(Elf_Sym const *sym, Elf32_Word const *symtab, Elf32_Word const *symtab_shndx) { unsigned long offset; + unsigned short shndx = w2(sym->st_shndx); int index; - if (sym->st_shndx != SHN_XINDEX) - return w2(sym->st_shndx); + if (shndx > SHN_UNDEF && shndx < SHN_LORESERVE) + return shndx; - offset = (unsigned long)sym - (unsigned long)symtab; - index = offset / sizeof(*sym); + if (shndx == SHN_XINDEX) { + offset = (unsigned long)sym - (unsigned long)symtab; + index = offset / sizeof(*sym); - return w(symtab_shndx[index]); + return w(symtab_shndx[index]); + } + + return 0; } static unsigned int get_shnum(Elf_Ehdr const *ehdr, Elf_Shdr const *shdr0)
--
2.18.0
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