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authorMasahiro Yamada <masahiroy@kernel.org>2022-07-31 02:36:35 +0900
committerMasahiro Yamada <masahiroy@kernel.org>2022-08-03 22:58:10 +0900
commit5419aa2a8deea06b796222d3215dac6adc270c78 (patch)
treed97177c46418af4e852f04c2925ad5245970943c /scripts/mod
parent125ed24a4ab0d704bab5dee5ccb2c3b05f627c78 (diff)
modpost: use more reliable way to get fromsec in section_rel(a)()
The section name of Rel and Rela starts with ".rel" and ".rela" respectively (but, I do not know whether this is specification or convention). For example, ".rela.text" holds relocation entries applied to the ".text" section. So, the code chops the ".rel" or ".rela" prefix to get the name of the section to which the relocation applies. However, I do not like to skip 4 or 5 bytes blindly because it is potential memory overrun. The ELF specification provides a more reliable way to do this. - The sh_info field holds extra information, whose interpretation depends on the section type - If the section type is SHT_REL or SHT_RELA, the sh_info field holds the section header index of the section to which the relocation applies. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Diffstat (limited to 'scripts/mod')
-rw-r--r--scripts/mod/modpost.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 148b38699889..c6a055c0291e 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -1723,8 +1723,7 @@ static void section_rela(const char *modname, struct elf_info *elf,
Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;
Elf_Rela *stop = (void *)start + sechdr->sh_size;
- fromsec = sech_name(elf, sechdr);
- fromsec += strlen(".rela");
+ fromsec = sec_name(elf, sechdr->sh_info);
/* if from section (name) is know good then skip it */
if (match(fromsec, section_white_list))
return;
@@ -1776,8 +1775,7 @@ static void section_rel(const char *modname, struct elf_info *elf,
Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;
Elf_Rel *stop = (void *)start + sechdr->sh_size;
- fromsec = sech_name(elf, sechdr);
- fromsec += strlen(".rel");
+ fromsec = sec_name(elf, sechdr->sh_info);
/* if from section (name) is know good then skip it */
if (match(fromsec, section_white_list))
return;