[PATCH v2] recordmcount: Correct st_shndx handling

* [PATCH v2] recordmcount: Correct st_shndx handling
@ 2021-06-15  6:47 ` Mark-PK Tsai
  0 siblings, 0 replies; 12+ messages in thread
From: Mark-PK Tsai @ 2021-06-15  6:47 UTC (permalink / raw)
  To: rostedt
  Cc: Matthias Brugger, Matt Helsley, Sami Tolvanen, Mark-PK Tsai,
	peterz, linux-kernel, linux-arm-kernel, linux-mediatek,
	yj.chiang

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>
Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
---
 scripts/recordmcount.h | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/scripts/recordmcount.h b/scripts/recordmcount.h
index f9b19524da11..ef9c3425f86b 100644
--- a/scripts/recordmcount.h
+++ b/scripts/recordmcount.h
@@ -194,13 +194,18 @@ static unsigned int get_symindex(Elf_Sym const *sym, Elf32_Word const *symtab,
 	unsigned long offset;
 	int index;
 
-	if (sym->st_shndx != SHN_XINDEX)
+	if (w2(sym->st_shndx) > SHN_UNDEF &&
+	    w2(sym->st_shndx) < SHN_LORESERVE)
 		return w2(sym->st_shndx);
 
-	offset = (unsigned long)sym - (unsigned long)symtab;
-	index = offset / sizeof(*sym);
+	if (w2(sym->st_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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