[PATCH v4 07/21] modpost: squash extable_mismatch_handler() into default_mismatch_handler()

Masahiro Yamada
2023-05-13T20:45:56Z

Merging these two reduces several lines of code. The extable section
mismatch is already distinguished by EXTABLE_TO_NON_TEXT.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

scripts/mod/modpost.c | 84 ++++++++++++++-----------------------------
1 file changed, 26 insertions(+), 58 deletions(-)

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 0bda2f22c985..49357a716519 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -881,27 +881,14 @@ enum mismatch {
* targeting sections in this array (white-list). Can be empty.
*
* @mismatch: Type of mismatch.
- *
- * @handler: Specific handler to call when a match is found. If NULL,
- * default_mismatch_handler() will be called.
- *
*/
struct sectioncheck {
const char *fromsec[20];
const char *bad_tosec[20];
const char *good_tosec[20];
enum mismatch mismatch;
- void (*handler)(const char *modname, struct elf_info *elf,
- const struct sectioncheck* const mismatch,
- Elf_Rela *r, Elf_Sym *sym, const char *fromsec);
-
};

-static void extable_mismatch_handler(const char *modname, struct elf_info *elf,
- const struct sectioncheck* const mismatch,
- Elf_Rela *r, Elf_Sym *sym,
- const char *fromsec);
-
static const struct sectioncheck sectioncheck[] = {
/* Do not reference init/exit code/data from
* normal code and data
@@ -974,7 +961,6 @@ static const struct sectioncheck sectioncheck[] = {
.bad_tosec = { ".altinstr_replacement", NULL },
.good_tosec = {ALL_TEXT_SECTIONS , NULL},
.mismatch = EXTABLE_TO_NON_TEXT,
- .handler = extable_mismatch_handler,
}
};

@@ -1255,60 +1241,42 @@ static void default_mismatch_handler(const char *modname, struct elf_info *elf,
modname, tosym, tosec);
break;
case EXTABLE_TO_NON_TEXT:
- fatal("There's a special handler for this mismatch type, we should never get here.\n");
+ warn("%s(%s+0x%lx): Section mismatch in reference to the %s:%s\n",
+ modname, fromsec, (long)r->r_offset, tosec, tosym);
+
+ if (match(tosec, mismatch->bad_tosec))
+ fatal("The relocation at %s+0x%lx references\n"
+ "section \"%s\" which is black-listed.\n"
+ "Something is seriously wrong and should be fixed.\n"
+ "You might get more information about where this is\n"
+ "coming from by using scripts/check_extable.sh %s\n",
+ fromsec, (long)r->r_offset, tosec, modname);
+ else if (is_executable_section(elf, get_secindex(elf, sym)))
+ warn("The relocation at %s+0x%lx references\n"
+ "section \"%s\" which is not in the list of\n"
+ "authorized sections. If you're adding a new section\n"
+ "and/or if this reference is valid, add \"%s\" to the\n"
+ "list of authorized sections to jump to on fault.\n"
+ "This can be achieved by adding \"%s\" to\n"
+ "OTHER_TEXT_SECTIONS in scripts/mod/modpost.c.\n",
+ fromsec, (long)r->r_offset, tosec, tosec, tosec);
+ else
+ error("%s+0x%lx references non-executable section '%s'\n",
+ fromsec, (long)r->r_offset, tosec);
break;
}
}

-static void extable_mismatch_handler(const char* modname, struct elf_info *elf,
- const struct sectioncheck* const mismatch,
- Elf_Rela* r, Elf_Sym* sym,
- const char *fromsec)
-{
- const char* tosec = sec_name(elf, get_secindex(elf, sym));
- Elf_Sym *tosym = find_elf_symbol(elf, r->r_addend, sym);
- const char *tosym_name = sym_name(elf, tosym);
-
- sec_mismatch_count++;
-
- warn("%s(%s+0x%lx): Section mismatch in reference to the %s:%s\n",
- modname, fromsec, (long)r->r_offset, tosec, tosym_name);
-
- if (match(tosec, mismatch->bad_tosec))
- fatal("The relocation at %s+0x%lx references\n"
- "section \"%s\" which is black-listed.\n"
- "Something is seriously wrong and should be fixed.\n"
- "You might get more information about where this is\n"
- "coming from by using scripts/check_extable.sh %s\n",
- fromsec, (long)r->r_offset, tosec, modname);
- else if (is_executable_section(elf, get_secindex(elf, sym)))
- warn("The relocation at %s+0x%lx references\n"
- "section \"%s\" which is not in the list of\n"
- "authorized sections. If you're adding a new section\n"
- "and/or if this reference is valid, add \"%s\" to the\n"
- "list of authorized sections to jump to on fault.\n"
- "This can be achieved by adding \"%s\" to\n"
- "OTHER_TEXT_SECTIONS in scripts/mod/modpost.c.\n",
- fromsec, (long)r->r_offset, tosec, tosec, tosec);
- else
- error("%s+0x%lx references non-executable section '%s'\n",
- fromsec, (long)r->r_offset, tosec);
-}
-
static void check_section_mismatch(const char *modname, struct elf_info *elf,
Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
{
const char *tosec = sec_name(elf, get_secindex(elf, sym));
const struct sectioncheck *mismatch = section_mismatch(fromsec, tosec);

- if (mismatch) {
- if (mismatch->handler)
- mismatch->handler(modname, elf, mismatch,
- r, sym, fromsec);
- else
- default_mismatch_handler(modname, elf, mismatch,
- r, sym, fromsec);
- }
+ if (!mismatch)
+ return;
+
+ default_mismatch_handler(modname, elf, mismatch, r, sym, fromsec);
}

static unsigned int *reloc_location(struct elf_info *elf,
--
2.39.2