From: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
To: Matthias Brugger <matthias.bgg@gmail.com>
Cc: <rostedt@goodmis.org>, Mark-PK Tsai <mark-pk.tsai@mediatek.com>,
"Sami Tolvanen" <samitolvanen@google.com>,
Matt Helsley <mhelsley@vmware.com>,
<linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-mediatek@lists.infradead.org>, <yj.chiang@mediatek.com>
Subject: [PATCH] recordmcount: avoid using ABS symbol as reference
Date: Mon, 7 Jun 2021 10:38:39 +0800 [thread overview]
Message-ID: <20210607023839.26387-1-mark-pk.tsai@mediatek.com> (raw)
Avoid using ABS symbol, which won't be relocate, as reference.
On arm64 platform, if there's shndx equals SHN_ABS(0xfff1).
Section Headers:
[Nr] Name Type Address Off Size ES Flg Lk Inf Al
[65521] .text.n_tty_receive_buf PROGBITS 0000000000000000 3cdab520 000054 00 AX 0 0 4
[65522] .rela.text.n_tty_receive_buf RELA 0000000000000000 3cdab578 000030 18 I 152076 65521 8
find_secsym_ndx, which use r_info in rela section to find the reference
symbol, may take ABS symbol as base.
Symbol table '.symtab' contains 453285 entries:
Num: Value Size Type Bind Vis Ndx Name
6: 0000000000000002 0 NOTYPE LOCAL DEFAULT ABS section_count
Which cause an invalid address in __mcount_loc.
Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
---
scripts/recordmcount.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/scripts/recordmcount.h b/scripts/recordmcount.h
index f9b19524da11..9b69167fb7ff 100644
--- a/scripts/recordmcount.h
+++ b/scripts/recordmcount.h
@@ -526,6 +526,10 @@ static int find_secsym_ndx(unsigned const txtndx,
for (symp = sym0, t = nsym; t; --t, ++symp) {
unsigned int const st_bind = ELF_ST_BIND(symp->st_info);
+ /* avoid absolute symbols */
+ if (symp->st_shndx == SHN_ABS)
+ continue;
+
if (txtndx == get_symindex(symp, symtab, symtab_shndx)
/* avoid STB_WEAK */
&& (STB_LOCAL == st_bind || STB_GLOBAL == st_bind)) {
--
2.18.0
next reply other threads:[~2021-06-07 2:39 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-07 2:38 Mark-PK Tsai [this message]
2021-06-07 6:37 ` [PATCH] recordmcount: avoid using ABS symbol as reference Ard Biesheuvel
2021-06-07 6:59 ` Mark-PK Tsai
2021-06-07 7:07 ` Ard Biesheuvel
2021-06-07 7:42 ` Mark-PK Tsai
2021-06-07 8:06 ` Mark-PK Tsai
2021-06-07 9:50 ` Ard Biesheuvel
2021-06-07 10:32 ` Mark-PK Tsai
2021-06-07 11:44 ` Peter Zijlstra
2021-06-07 13:18 ` Mark-PK Tsai
2021-06-07 13:44 ` Steven Rostedt
2021-06-07 17:31 ` Mark-PK Tsai
2021-06-07 15:40 ` Peter Zijlstra
2021-06-08 1:15 ` Mark-PK Tsai
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