From 6f9bc70dd584ed41dc1da31bf0342b3cf95ba5d9 Mon Sep 17 00:00:00 2001 From: =?utf8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= Date: Sun, 1 Mar 2020 15:50:37 +0100 Subject: [PATCH] linux-5.4: backport modpost upstream patches MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Fixes modpost Segmentation Fault with bcm2708 and bcm2709: MODPOST vmlinux.o Segmentation fault make[6]: *** [scripts/Makefile.modpost:66: __modpost] Error 139 Signed-off-by: Álvaro Fernández Rojas --- ...lper-to-get-data-pointed-by-a-symbol.patch | 53 ++++++++++++++++ ...-namespace_from_kstrtabns-to-not-har.patch | 62 +++++++++++++++++++ .../generic/hack-5.4/204-module_strip.patch | 12 ++-- .../211-darwin-uuid-typedef-clash.patch | 5 -- 4 files changed, 121 insertions(+), 11 deletions(-) create mode 100644 target/linux/generic/backport-5.4/030-modpost-add-a-helper-to-get-data-pointed-by-a-symbol.patch create mode 100644 target/linux/generic/backport-5.4/031-modpost-refactor-namespace_from_kstrtabns-to-not-har.patch 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 +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 +--- + 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 +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 +--- + 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; diff --git a/target/linux/generic/hack-5.4/204-module_strip.patch b/target/linux/generic/hack-5.4/204-module_strip.patch index d37dfd4f98..8b84ddd7f0 100644 --- a/target/linux/generic/hack-5.4/204-module_strip.patch +++ b/target/linux/generic/hack-5.4/204-module_strip.patch @@ -135,7 +135,7 @@ Signed-off-by: Felix Fietkau --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c -@@ -2051,7 +2051,9 @@ static void read_symbols(const char *mod +@@ -2056,7 +2056,9 @@ static void read_symbols(const char *mod symname = remove_dot(info.strtab + sym->st_name); handle_modversions(mod, &info, sym, symname); @@ -145,7 +145,7 @@ Signed-off-by: Felix Fietkau } /* Apply symbol namespaces from __kstrtabns_ entries. */ -@@ -2265,8 +2267,10 @@ static void add_header(struct buffer *b, +@@ -2270,8 +2272,10 @@ static void add_header(struct buffer *b, buf_printf(b, "\n"); buf_printf(b, "BUILD_SALT;\n"); buf_printf(b, "\n"); @@ -156,7 +156,7 @@ Signed-off-by: Felix Fietkau buf_printf(b, "\n"); buf_printf(b, "__visible struct module __this_module\n"); buf_printf(b, "__section(.gnu.linkonce.this_module) = {\n"); -@@ -2283,8 +2287,10 @@ static void add_header(struct buffer *b, +@@ -2288,8 +2292,10 @@ static void add_header(struct buffer *b, static void add_intree_flag(struct buffer *b, int is_intree) { @@ -167,7 +167,7 @@ Signed-off-by: Felix Fietkau } /* Cannot check for assembler */ -@@ -2297,8 +2303,10 @@ static void add_retpoline(struct buffer +@@ -2302,8 +2308,10 @@ static void add_retpoline(struct buffer static void add_staging_flag(struct buffer *b, const char *name) { @@ -178,7 +178,7 @@ Signed-off-by: Felix Fietkau } /** -@@ -2382,11 +2390,13 @@ static void add_depends(struct buffer *b +@@ -2387,11 +2395,13 @@ static void add_depends(struct buffer *b static void add_srcversion(struct buffer *b, struct module *mod) { @@ -192,7 +192,7 @@ Signed-off-by: Felix Fietkau } static void write_if_changed(struct buffer *b, const char *fname) -@@ -2656,7 +2666,9 @@ int main(int argc, char **argv) +@@ -2661,7 +2671,9 @@ int main(int argc, char **argv) add_staging_flag(&buf, mod->name); err |= add_versions(&buf, mod); add_depends(&buf, mod); diff --git a/target/linux/generic/hack-5.4/211-darwin-uuid-typedef-clash.patch b/target/linux/generic/hack-5.4/211-darwin-uuid-typedef-clash.patch index 4a424c99c1..50a6227148 100644 --- a/target/linux/generic/hack-5.4/211-darwin-uuid-typedef-clash.patch +++ b/target/linux/generic/hack-5.4/211-darwin-uuid-typedef-clash.patch @@ -8,8 +8,6 @@ Signed-off-by: Kevin Darbyshire-Bryant scripts/mod/file2alias.c | 3 +++ 1 file changed, 3 insertions(+) -diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c -index c91eba751804..e756fd80b721 100644 --- a/scripts/mod/file2alias.c +++ b/scripts/mod/file2alias.c @@ -38,6 +38,9 @@ typedef struct { @@ -22,6 +20,3 @@ index c91eba751804..e756fd80b721 100644 /* backwards compatibility, don't use in new code */ typedef struct { __u8 b[16]; --- -2.21.1 (Apple Git-122.3) - -- 2.25.1