diff options
Diffstat (limited to 'target/linux/generic/backport-5.4')
2 files changed, 115 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.4/030-modpost-add-a-helper-to-get-data-pointed-by-a-symbol.patch b/target/linux/generic/backport-5.4/030-modpost-add-a-helper-to-get-data-pointed-by-a-symbol.patch new file mode 100644 index 0000000000..cf88c0c69f --- /dev/null +++ b/target/linux/generic/backport-5.4/030-modpost-add-a-helper-to-get-data-pointed-by-a-symbol.patch @@ -0,0 +1,53 @@ +From afa0459daa7b08c7b2c879705b69d39b734a11d0 Mon Sep 17 00:00:00 2001 +From: Masahiro Yamada <yamada.masahiro@socionext.com> +Date: Fri, 15 Nov 2019 02:42:21 +0900 +Subject: [PATCH] modpost: add a helper to get data pointed by a symbol + +When CONFIG_MODULE_REL_CRCS is enabled, the value of __crc_* is not +an absolute value, but the address to the CRC data embedded in the +.rodata section. + +Getting the data pointed by the symbol value is somewhat complex. +Split it out into a new helper, sym_get_data(). + +I will reuse it to refactor namespace_from_kstrtabns() in the next +commit. + +Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> +--- + scripts/mod/modpost.c | 17 +++++++++++++---- + 1 file changed, 13 insertions(+), 4 deletions(-) + +--- a/scripts/mod/modpost.c ++++ b/scripts/mod/modpost.c +@@ -312,6 +312,18 @@ static const char *sec_name(struct elf_i + return sech_name(elf, &elf->sechdrs[secindex]); + } + ++static void *sym_get_data(const struct elf_info *info, const Elf_Sym *sym) ++{ ++ Elf_Shdr *sechdr = &info->sechdrs[sym->st_shndx]; ++ unsigned long offset; ++ ++ offset = sym->st_value; ++ if (info->hdr->e_type != ET_REL) ++ offset -= sechdr->sh_addr; ++ ++ return (void *)info->hdr + sechdr->sh_offset + offset; ++} ++ + #define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0) + + static enum export export_from_secname(struct elf_info *elf, unsigned int sec) +@@ -701,10 +713,7 @@ static void handle_modversions(struct mo + unsigned int *crcp; + + /* symbol points to the CRC in the ELF object */ +- crcp = (void *)info->hdr + sym->st_value + +- info->sechdrs[sym->st_shndx].sh_offset - +- (info->hdr->e_type != ET_REL ? +- info->sechdrs[sym->st_shndx].sh_addr : 0); ++ crcp = sym_get_data(info, sym); + crc = TO_NATIVE(*crcp); + } + sym_update_crc(symname + strlen("__crc_"), mod, crc, diff --git a/target/linux/generic/backport-5.4/031-modpost-refactor-namespace_from_kstrtabns-to-not-har.patch b/target/linux/generic/backport-5.4/031-modpost-refactor-namespace_from_kstrtabns-to-not-har.patch new file mode 100644 index 0000000000..230dc6b89a --- /dev/null +++ b/target/linux/generic/backport-5.4/031-modpost-refactor-namespace_from_kstrtabns-to-not-har.patch @@ -0,0 +1,62 @@ +From e84f9fbbece1585f45a03ccc11eeabe121cadc1b Mon Sep 17 00:00:00 2001 +From: Masahiro Yamada <yamada.masahiro@socionext.com> +Date: Fri, 15 Nov 2019 02:42:22 +0900 +Subject: [PATCH] modpost: refactor namespace_from_kstrtabns() to not hard-code + section name + +Currently, namespace_from_kstrtabns() relies on the fact that +namespace strings are recorded in the __ksymtab_strings section. +Actually, it is coded in include/linux/export.h, but modpost does +not need to hard-code the section name. + +Elf_Sym::st_shndx holds the index of the relevant section. Using it is +a more portable way to get the namespace string. + +Make namespace_from_kstrtabns() simply call sym_get_data(), and delete +the info->ksymtab_strings . + +While I was here, I added more 'const' qualifiers to pointers. + +Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> +--- + scripts/mod/modpost.c | 10 +++------- + scripts/mod/modpost.h | 1 - + 2 files changed, 3 insertions(+), 8 deletions(-) + +--- a/scripts/mod/modpost.c ++++ b/scripts/mod/modpost.c +@@ -360,10 +360,10 @@ static enum export export_from_sec(struc + return export_unknown; + } + +-static const char *namespace_from_kstrtabns(struct elf_info *info, +- Elf_Sym *kstrtabns) ++static const char *namespace_from_kstrtabns(const struct elf_info *info, ++ const Elf_Sym *sym) + { +- char *value = info->ksymtab_strings + kstrtabns->st_value; ++ const char *value = sym_get_data(info, sym); + return value[0] ? value : NULL; + } + +@@ -605,10 +605,6 @@ static int parse_elf(struct elf_info *in + info->export_unused_gpl_sec = i; + else if (strcmp(secname, "__ksymtab_gpl_future") == 0) + info->export_gpl_future_sec = i; +- else if (strcmp(secname, "__ksymtab_strings") == 0) +- info->ksymtab_strings = (void *)hdr + +- sechdrs[i].sh_offset - +- sechdrs[i].sh_addr; + + if (sechdrs[i].sh_type == SHT_SYMTAB) { + unsigned int sh_link_idx; +--- a/scripts/mod/modpost.h ++++ b/scripts/mod/modpost.h +@@ -143,7 +143,6 @@ struct elf_info { + Elf_Section export_gpl_sec; + Elf_Section export_unused_gpl_sec; + Elf_Section export_gpl_future_sec; +- char *ksymtab_strings; + char *strtab; + char *modinfo; + unsigned int modinfo_len; |