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efivar/efivar-bsc1206388-revamp-efi_well_known-variable-handling.patch

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From 06a27de4468c879494db0e34d37b4ad2e5788af4 Mon Sep 17 00:00:00 2001
From: Nicholas Vinson <nvinson234@gmail.com>
Date: Mon, 10 Oct 2022 14:22:36 -0400
Subject: [PATCH] Revamp efi_well_known_* variable handling
The current implementation attempts to use the linker to create aliases
for efi_well_known_guids and efi_well_known_names. It also tries to use
the linker to generate the variables efi_well_known_guids_end and
efi_well_known_names_end.
When building with clang, the generated linker result results in a
broken libefivar.so that causes programs to segfault when linked against
it. This change does away with linker script hacker and instead
introduces pointers to store the locations of efi_well_known_guids_end
and efi_well_known_names_end.
Additionally, efi_well_known_guids and efi_well_known_names are now
created as pointers that point to the beginning of their respective
arrays.
Signed-off-by: Nicholas Vinson <nvinson234@gmail.com>
Fixes: #234
---
src/Makefile | 7 ++--
src/include/rules.mk | 5 +--
src/include/workarounds.mk | 24 -------------
src/makeguids.c | 72 +++++++++++++-------------------------
4 files changed, 27 insertions(+), 81 deletions(-)
delete mode 100644 src/include/workarounds.mk
diff --git a/src/Makefile b/src/Makefile
index 0e423c4..a655a56 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -4,7 +4,6 @@ include $(TOPDIR)/src/include/deprecated.mk
include $(TOPDIR)/src/include/version.mk
include $(TOPDIR)/src/include/rules.mk
include $(TOPDIR)/src/include/defaults.mk
-include $(TOPDIR)/src/include/workarounds.mk
LIBTARGETS=libefivar.so libefiboot.so libefisec.so
STATICLIBTARGETS=libefivar.a libefiboot.a libefisec.a
@@ -30,7 +29,7 @@ EFISECDB_OBJECTS = $(patsubst %.S,%.o,$(patsubst %.c,%.o,$(EFISECDB_SOURCES)))
GENERATED_SOURCES = include/efivar/efivar-guids.h guid-symbols.c
MAKEGUIDS_SOURCES = makeguids.c util.c
MAKEGUIDS_OBJECTS = $(patsubst %.S,%.o,$(patsubst %.c,%.o,$(MAKEGUIDS_SOURCES)))
-MAKEGUIDS_OUTPUT = $(GENERATED_SOURCES) guids.lds
+MAKEGUIDS_OUTPUT = $(GENERATED_SOURCES)
ALL_SOURCES=$(LIBEFISEC_SOURCES) $(LIBEFIBOOT_SOURCES) $(LIBEFIVAR_SOURCES) \
$(MAKEGUIDS_SOURCES) $(GENERATED_SOURCES) $(EFIVAR_SOURCES) \
@@ -81,7 +80,7 @@ $(MAKEGUIDS_OUTPUT) : guids.txt
if [ "$${missing}" != "no" ]; then \
exit 1 ; \
fi
- ./makeguids $(LD_DASH_T) guids.txt guid-symbols.c include/efivar/efivar-guids.h guids.lds
+ ./makeguids guids.txt guid-symbols.c include/efivar/efivar-guids.h
prep : makeguids $(GENERATED_SOURCES)
@@ -93,7 +92,6 @@ libefivar.a : $(patsubst %.o,%.static.o,$(LIBEFIVAR_OBJECTS))
libefivar.so : $(LIBEFIVAR_OBJECTS)
libefivar.so : | $(GENERATED_SOURCES) libefivar.map
libefivar.so : LIBS=dl
-libefivar.so : LDSCRIPTS=guids.lds
libefivar.so : MAP=libefivar.map
efivar : $(EFIVAR_OBJECTS) | libefivar.so
@@ -134,7 +132,6 @@ deps : $(ALL_SOURCES)
clean :
@rm -rfv *~ *.o *.a *.E *.so *.so.* *.pc *.bin .*.d *.map \
makeguids guid-symbols.c include/efivar/efivar-guids.h \
- guids.lds \
$(TARGETS) $(STATICTARGETS)
@# remove the deps files we used to create, as well.
@rm -rfv .*.P .*.h.P *.S.P include/efivar/.*.h.P
diff --git a/src/include/rules.mk b/src/include/rules.mk
index f309f86..8d0b68a 100644
--- a/src/include/rules.mk
+++ b/src/include/rules.mk
@@ -3,7 +3,6 @@ default : all
.PHONY: default all clean install test
include $(TOPDIR)/src/include/version.mk
-include $(TOPDIR)/src/include/workarounds.mk
comma:= ,
empty:=
@@ -36,9 +35,7 @@ family = $(foreach FAMILY_SUFFIX,$(FAMILY_SUFFIXES),$($(1)_$(FAMILY_SUFFIX)))
$(CCLD) $(CCLDFLAGS) $(CPPFLAGS) -o $@ $(sort $^) $(LDLIBS)
%.so :
- $(CCLD) $(CCLDFLAGS) $(CPPFLAGS) $(SOFLAGS) \
- $(foreach LDS,$(LDSCRIPTS),$(LD_DASH_T) $(LDS)) \
- -o $@ $^ $(LDLIBS)
+ $(CCLD) $(CCLDFLAGS) $(CPPFLAGS) $(SOFLAGS) -o $@ $^ $(LDLIBS)
ln -vfs $@ $@.1
%.abixml : %.so
diff --git a/src/include/workarounds.mk b/src/include/workarounds.mk
deleted file mode 100644
index 3118834..0000000
--- a/src/include/workarounds.mk
+++ /dev/null
@@ -1,24 +0,0 @@
-# SPDX-License-Identifier: SPDX-License-Identifier: LGPL-2.1-or-later
-#
-# workarounds.mk - workarounds for weird stuff behavior
-
-LD_FLAVOR := $(shell $(LD) --version | grep -E '^(LLD|GNU ld)'|sed 's/ .*//g')
-LD_VERSION := $(shell $(LD) --version | grep -E '^(LLD|GNU ld)'|sed 's/.* //')
-# I haven't tested 2.36 here; 2.35 is definitely broken and 2.37 seems to work
-LD_DASH_T := $(shell \
- if [ "x${LD_FLAVOR}" = xLLD ] ; then \
- echo '-T' ; \
- elif [ "x${LD_FLAVOR}" = xGNU ] ; then \
- if echo "${LD_VERSION}" | grep -q -E '^2\.3[789]|^2\.[456789]|^[3456789]|^[[:digit:]][[:digit:]]' ; then \
- echo '-T' ; \
- else \
- echo "" ; \
- fi ; \
- else \
- echo "Your linker is not supported" ; \
- exit 1 ; \
- fi)
-
-export LD_DASH_T
-
-# vim:ft=make
diff --git a/src/makeguids.c b/src/makeguids.c
index e4ff411..b9e9312 100644
--- a/src/makeguids.c
+++ b/src/makeguids.c
@@ -107,51 +107,46 @@ write_guidnames(FILE *out, const char *listname,
gn->symbol, gn->name, gn->description);
}
fprintf(out, "};\n");
+ fprintf(out, "const struct efivar_guidname\n"
+ "\t__attribute__((__visibility__ (\"default\")))\n"
+ "\t* const %s = %s_;\n", listname, listname);
+ fprintf(out, "const struct efivar_guidname\n"
+ "\t__attribute__((__visibility__ (\"default\")))\n"
+ "\t* const %s_end = %s_\n\t+ %zd;\n",
+ listname, listname, n - 1);
}
int
main(int argc, char *argv[])
{
int rc;
- int argstart = 0;
- FILE *symout, *header, *ldsout;
- int dash_t = 0;
+ FILE *symout, *header;
- if (argc < 5) {
+ if (argc < 4) {
errx(1, "Not enough arguments.\n");
- } else if (argc > 5 && !strcmp(argv[1],"-T")) {
- argstart = 1;
- dash_t = 1;
- } else if (argc > 5) {
+ } else if (argc > 4) {
errx(1, "Too many arguments.\n");
}
- symout = fopen(argv[argstart + 2], "w");
+ symout = fopen(argv[2], "w");
if (symout == NULL)
- err(1, "could not open \"%s\"", argv[argstart + 2]);
- rc = chmod(argv[argstart + 2], 0644);
+ err(1, "could not open \"%s\"", argv[2]);
+ rc = chmod(argv[2], 0644);
if (rc < 0)
- warn("chmod(%s, 0644)", argv[argstart + 2]);
+ warn("chmod(%s, 0644)", argv[2]);
- header = fopen(argv[argstart + 3], "w");
+ header = fopen(argv[3], "w");
if (header == NULL)
- err(1, "could not open \"%s\"", argv[argstart + 3]);
- rc = chmod(argv[argstart + 3], 0644);
- if (rc < 0)
- warn("chmod(%s, 0644)", argv[argstart + 3]);
-
- ldsout = fopen(argv[argstart + 4], "w");
- if (ldsout == NULL)
- err(1, "could not open \"%s\"", argv[argstart + 4]);
- rc = chmod(argv[argstart + 4], 0644);
+ err(1, "could not open \"%s\"", argv[3]);
+ rc = chmod(argv[3], 0644);
if (rc < 0)
- warn("chmod(%s, 0644)", argv[argstart + 4]);
+ warn("chmod(%s, 0644)", argv[3]);
struct guidname_index *guidnames = NULL;
- rc = read_guids_at(AT_FDCWD, argv[argstart + 1], &guidnames);
+ rc = read_guids_at(AT_FDCWD, argv[1], &guidnames);
if (rc < 0)
- err(1, "could not read \"%s\"", argv[argstart + 1]);
+ err(1, "could not read \"%s\"", argv[1]);
struct efivar_guidname *outbuf;
@@ -239,12 +234,11 @@ struct efivar_guidname {\n\
fprintf(header,
"extern const struct efivar_guidname\n"
"\t__attribute__((__visibility__ (\"default\")))\n"
- "\tefi_well_known_guids[%d];\n",
- i);
+ "\t* const efi_well_known_guids;\n");
fprintf(header,
"extern const struct efivar_guidname\n"
"\t__attribute__((__visibility__ (\"default\")))\n"
- "\tefi_well_known_guids_end;\n");
+ "\t* const efi_well_known_guids_end;\n");
fprintf(header,
"extern const uint64_t\n"
"\t__attribute__((__visibility__ (\"default\")))\n"
@@ -252,12 +246,11 @@ struct efivar_guidname {\n\
fprintf(header,
"extern const struct efivar_guidname\n"
"\t__attribute__((__visibility__ (\"default\")))\n"
- "\tefi_well_known_names[%d];\n",
- i);
+ "\t* const efi_well_known_names;\n");
fprintf(header,
"extern const struct efivar_guidname\n"
"\t__attribute__((__visibility__ (\"default\")))\n"
- "\tefi_well_known_names_end;\n");
+ "\t* const efi_well_known_names_end;\n");
fprintf(header,
"extern const uint64_t\n"
"\t__attribute__((__visibility__ (\"default\")))\n"
@@ -302,23 +295,6 @@ struct efivar_guidname {\n\
fclose(symout);
- fprintf(ldsout,
- "SECTIONS\n"
- "{\n"
- " .data :\n"
- " {\n"
- " efi_well_known_guids = efi_well_known_guids_;\n"
- " efi_well_known_guids_end = efi_well_known_guids_ + %zd;\n"
- " efi_well_known_names = efi_well_known_names_;\n"
- " efi_well_known_names_end = efi_well_known_names_ + %zd;\n"
- " }\n"
- "}%s;\n",
- (line - 1) * sizeof(struct efivar_guidname),
- (line - 1) * sizeof(struct efivar_guidname),
- dash_t ? " INSERT AFTER .data" : "");
-
- fclose(ldsout);
-
free(guidnames->strtab);
free(guidnames);
--
2.35.3
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