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| author | Peter Zijlstra <peterz@infradead.org> | 2021-06-16 17:41:26 +0200 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2021-06-18 15:09:17 +0200 |
| commit | fb780761e7bd9f2e94f5b9a296ead6b35b944206 (patch) | |
| tree | 75d08ed9c036205c84c0e0275054a82b10d33963 /scripts/recordmcount.h | |
| parent | tracing: Correct the length check which causes memory corruption (diff) | |
| download | linux-fb780761e7bd9f2e94f5b9a296ead6b35b944206.tar.xz linux-fb780761e7bd9f2e94f5b9a296ead6b35b944206.zip | |
recordmcount: Correct st_shndx handling
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.
Link: https://lore.kernel.org/lkml/20210607023839.26387-1-mark-pk.tsai@mediatek.com/
Link: https://lkml.kernel.org/r/20210616154126.2794-1-mark-pk.tsai@mediatek.com
Reported-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Tested-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
[handle endianness of sym->st_shndx]
Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'scripts/recordmcount.h')
| -rw-r--r-- | scripts/recordmcount.h | 15 |
1 files 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) |