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[build] Do not apply WORKAROUND_CFLAGS for host compiler 

The WORKAROUND_CFLAGS list is constructed based on running tests on
the target compiler, and the results may not be valid for the host
compiler.

The only relevant workaround required for the host compiler is
-Wno-stringop-truncation, which is needed to avoid a spurious compiler
warning for a totally correct usage of strncpy() in util/elf2efi.c.

Duplicating the workaround tests for the host compiler is messy, as is
conditionally applying __attribute__((nonstring)).  Fix instead by
disapplying WORKAROUND_CFLAGS for the host compiler, and using
memcpy() with an explicitly calculated length instead of strncpy() in
util/elf2efi.c.

Reported-by: Ignat Korchagin <ignat@cloudflare.com>
Reported-by: Christopher Clark <christopher.w.clark@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/94/head
Michael Brown 2019-07-22 14:51:28 +01:00
parent 1dd56dbd11
commit a4f8c6e31f
2 changed files with 6 additions and 2 deletions
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2
src/Makefile.housekeeping
View File

@ -454,7 +454,7 @@ endif
CFLAGS += $(WORKAROUND_CFLAGS) $(EXTRA_CFLAGS)
ASFLAGS += $(WORKAROUND_ASFLAGS) $(EXTRA_ASFLAGS)
LDFLAGS += $(WORKAROUND_LDFLAGS) $(EXTRA_LDFLAGS)
HOST_CFLAGS += $(WORKAROUND_CFLAGS) -O2 -g
HOST_CFLAGS += -O2 -g
# Inhibit -Werror if NO_WERROR is specified on make command line
#

6
src/util/elf2efi.c
View File

@ -458,6 +458,7 @@ static struct pe_section * process_section ( struct elf_file *elf,
struct pe_header *pe_header ) {
struct pe_section *new;
const char *name;
size_t name_len;
size_t section_memsz;
size_t section_filesz;
unsigned long code_start;
@ -494,7 +495,10 @@ static struct pe_section * process_section ( struct elf_file *elf,
memset ( new, 0, sizeof ( *new ) + section_filesz );
/* Fill in section header details */
strncpy ( ( char * ) new->hdr.Name, name, sizeof ( new->hdr.Name ) );
name_len = strlen ( name );
if ( name_len > sizeof ( new->hdr.Name ) )
name_len = sizeof ( new->hdr.Name );
memcpy ( new->hdr.Name, name, name_len );
new->hdr.Misc.VirtualSize = section_memsz;
new->hdr.VirtualAddress = shdr->sh_addr;
new->hdr.SizeOfRawData = section_filesz;