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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 13/21] libelf: use only unsigned integers
Signed integers have undesirable undefined behaviours on overflow.
Malicious compilers can turn apparently-correct code into code with
security vulnerabilities etc.
So use only unsigned integers. Exceptions are booleans (which we have
already changed) and error codes.
We _do_ change all the chars which aren't fixed constants from our own
text segment, but not the char*s. This is because it is safe to
access an arbitrary byte through a char*, but not necessarily safe to
convert an arbitrary value to a char.
As a consequence we need to compile libelf with -Wno-pointer-sign.
It is OK to change all the signed integers to unsigned because all the
inequalities in libelf are in contexts where we don't "expect"
negative numbers.
In libelf-dominfo.c:elf_xen_parse we rename a variable "rc" to
"more_notes" as it actually contains a note count derived from the
input image. The "error" return value from elf_xen_parse_notes is
changed from -1 to ~0U.
grepping shows only one occurrence of "PRId" or "%d" or "%ld" in
libelf and xc_dom_elfloader.c (a "%d" which becomes "%u").
This is part of the fix to a security issue, XSA-55.
Conflicts in 4.1 series:
* xc_dom_load_elf_kernel has no rc variable to change.
* elf_load_image doesn't exist.
For those concerned about unintentional functional changes, the
following rune produces a version of the patch which is much smaller
and eliminates only non-functional changes:
GIT_EXTERNAL_DIFF=.../unsigned-differ git-diff <before>..<after>
where <before> and <after> are git refs for the code before and after
this patch, and unsigned-differ is this shell script:
#!/bin/bash
set -e
seddery () {
perl -pe 's/\b(?:elf_errorstatus|elf_negerrnoval)\b/int/g'
}
path="$1"
in="$2"
out="$5"
set +e
diff -pu --label "$path~" <(seddery <"$in") --label "$path" <(seddery
<"$out")
rc=$?
set -e
if [ $rc = 1 ]; then rc=0; fi
exit $rc
Signed-off-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
tools/libxc/Makefile | 9 +++++-
tools/libxc/xc_dom.h | 7 +++--
tools/libxc/xc_dom_elfloader.c | 40 +++++++++++++++------------
tools/xcutils/readnotes.c | 15 +++++-----
xen/common/libelf/Makefile | 2 +
xen/common/libelf/libelf-dominfo.c | 52 ++++++++++++++++++-----------------
xen/common/libelf/libelf-loader.c | 12 ++++----
xen/common/libelf/libelf-tools.c | 22 +++++++-------
xen/include/xen/libelf.h | 19 +++++++-----
9 files changed, 98 insertions(+), 80 deletions(-)
diff --git a/tools/libxc/Makefile b/tools/libxc/Makefile
index 6f5c307..139b791 100644
--- a/tools/libxc/Makefile
+++ b/tools/libxc/Makefile
@@ -49,8 +49,13 @@ GUEST_SRCS-$(CONFIG_HVM) += xc_hvm_build.c
vpath %.c ../../xen/common/libelf
CFLAGS += -I../../xen/common/libelf
-GUEST_SRCS-y += libelf-tools.c libelf-loader.c
-GUEST_SRCS-y += libelf-dominfo.c
+ELF_SRCS-y += libelf-tools.c libelf-loader.c
+ELF_SRCS-y += libelf-dominfo.c
+
+GUEST_SRCS-y += $(ELF_SRCS-y)
+
+$(patsubst %.c,%.o,$(ELF_SRCS-y)): CFLAGS += -Wno-pointer-sign
+$(patsubst %.c,%.opic,$(ELF_SRCS-y)): CFLAGS += -Wno-pointer-sign
# new domain builder
GUEST_SRCS-y += xc_dom_core.c xc_dom_boot.c
diff --git a/tools/libxc/xc_dom.h b/tools/libxc/xc_dom.h
index 6b118ad..9dffbe6 100644
--- a/tools/libxc/xc_dom.h
+++ b/tools/libxc/xc_dom.h
@@ -135,9 +135,10 @@ struct xc_dom_image {
struct xc_dom_loader {
char *name;
- int (*probe) (struct xc_dom_image * dom);
- int (*parser) (struct xc_dom_image * dom);
- int (*loader) (struct xc_dom_image * dom);
+ /* Sadly the error returns from these functions are not consistent: */
+ elf_negerrnoval (*probe) (struct xc_dom_image * dom);
+ elf_negerrnoval (*parser) (struct xc_dom_image * dom);
+ elf_errorstatus (*loader) (struct xc_dom_image * dom);
struct xc_dom_loader *next;
};
diff --git a/tools/libxc/xc_dom_elfloader.c b/tools/libxc/xc_dom_elfloader.c
index c3da5b9..2d25824 100644
--- a/tools/libxc/xc_dom_elfloader.c
+++ b/tools/libxc/xc_dom_elfloader.c
@@ -84,7 +84,7 @@ static char *xc_dom_guest_type(struct xc_dom_image *dom,
/* ------------------------------------------------------------------------ */
/* parse elf binary */
-static int check_elf_kernel(struct xc_dom_image *dom, bool verbose)
+static elf_negerrnoval check_elf_kernel(struct xc_dom_image *dom, bool verbose)
{
if ( dom->kernel_blob == NULL )
{
@@ -106,12 +106,12 @@ static int check_elf_kernel(struct xc_dom_image *dom,
bool verbose)
return 0;
}
-static int xc_dom_probe_elf_kernel(struct xc_dom_image *dom)
+static elf_negerrnoval xc_dom_probe_elf_kernel(struct xc_dom_image *dom)
{
return check_elf_kernel(dom, 0);
}
-static int xc_dom_load_elf_symtab(struct xc_dom_image *dom,
+static elf_errorstatus xc_dom_load_elf_symtab(struct xc_dom_image *dom,
struct elf_binary *elf, bool load)
{
struct elf_binary syms;
@@ -119,7 +119,7 @@ static int xc_dom_load_elf_symtab(struct xc_dom_image *dom,
xen_vaddr_t symtab, maxaddr;
ELF_PTRVAL_CHAR hdr;
size_t size;
- int h, count, type, i, tables = 0;
+ unsigned h, count, type, i, tables = 0;
if ( elf_swap(elf) )
{
@@ -140,13 +140,13 @@ static int xc_dom_load_elf_symtab(struct xc_dom_image
*dom,
elf->caller_xdest_base = hdr_ptr;
elf->caller_xdest_size = allow_size;
hdr = ELF_REALPTR2PTRVAL(hdr_ptr);
- elf_store_val(elf, int, hdr, size - sizeof(int));
+ elf_store_val(elf, unsigned, hdr, size - sizeof(unsigned));
}
else
{
char *hdr_ptr;
- size = sizeof(int) + elf_size(elf, elf->ehdr) +
+ size = sizeof(unsigned) + elf_size(elf, elf->ehdr) +
elf_shdr_count(elf) * elf_size(elf, shdr);
hdr_ptr = xc_dom_malloc(dom, size);
if ( hdr_ptr == NULL )
@@ -157,15 +157,15 @@ static int xc_dom_load_elf_symtab(struct xc_dom_image
*dom,
dom->bsd_symtab_start = elf_round_up(elf, dom->kernel_seg.vend);
}
- elf_memcpy_safe(elf, hdr + sizeof(int),
+ elf_memcpy_safe(elf, hdr + sizeof(unsigned),
ELF_IMAGE_BASE(elf),
elf_size(elf, elf->ehdr));
- elf_memcpy_safe(elf, hdr + sizeof(int) + elf_size(elf, elf->ehdr),
+ elf_memcpy_safe(elf, hdr + sizeof(unsigned) + elf_size(elf, elf->ehdr),
ELF_IMAGE_BASE(elf) + elf_uval(elf, elf->ehdr, e_shoff),
elf_shdr_count(elf) * elf_size(elf, shdr));
if ( elf_64bit(elf) )
{
- Elf64_Ehdr *ehdr = (Elf64_Ehdr *)(hdr + sizeof(int));
+ Elf64_Ehdr *ehdr = (Elf64_Ehdr *)(hdr + sizeof(unsigned));
ehdr->e_phoff = 0;
ehdr->e_phentsize = 0;
ehdr->e_phnum = 0;
@@ -174,22 +174,22 @@ static int xc_dom_load_elf_symtab(struct xc_dom_image
*dom,
}
else
{
- Elf32_Ehdr *ehdr = (Elf32_Ehdr *)(hdr + sizeof(int));
+ Elf32_Ehdr *ehdr = (Elf32_Ehdr *)(hdr + sizeof(unsigned));
ehdr->e_phoff = 0;
ehdr->e_phentsize = 0;
ehdr->e_phnum = 0;
ehdr->e_shoff = elf_size(elf, elf->ehdr);
ehdr->e_shstrndx = SHN_UNDEF;
}
- if ( elf->caller_xdest_size < sizeof(int) )
+ if ( elf->caller_xdest_size < sizeof(unsigned) )
{
DOMPRINTF("%s/%s: header size %"PRIx64" too small",
__FUNCTION__, load ? "load" : "parse",
(uint64_t)elf->caller_xdest_size);
return -1;
}
- if ( elf_init(&syms, elf->caller_xdest_base + sizeof(int),
- elf->caller_xdest_size - sizeof(int)) )
+ if ( elf_init(&syms, elf->caller_xdest_base + sizeof(unsigned),
+ elf->caller_xdest_size - sizeof(unsigned)) )
return -1;
/*
@@ -209,7 +209,7 @@ static int xc_dom_load_elf_symtab(struct xc_dom_image *dom,
xc_elf_set_logfile(dom->xch, &syms, 1);
- symtab = dom->bsd_symtab_start + sizeof(int);
+ symtab = dom->bsd_symtab_start + sizeof(unsigned);
maxaddr = elf_round_up(&syms, symtab + elf_size(&syms, syms.ehdr) +
elf_shdr_count(&syms) * elf_size(&syms, shdr));
@@ -255,7 +255,7 @@ static int xc_dom_load_elf_symtab(struct xc_dom_image *dom,
size = elf_uval(&syms, shdr, sh_size);
maxaddr = elf_round_up(&syms, maxaddr + size);
tables++;
- DOMPRINTF("%s: h=%d %s, size=0x%zx, maxaddr=0x%" PRIx64 "",
+ DOMPRINTF("%s: h=%u %s, size=0x%zx, maxaddr=0x%" PRIx64 "",
__FUNCTION__, h,
type == SHT_SYMTAB ? "symtab" : "strtab",
size, maxaddr);
@@ -294,10 +294,14 @@ static int xc_dom_load_elf_symtab(struct xc_dom_image
*dom,
return 0;
}
-static int xc_dom_parse_elf_kernel(struct xc_dom_image *dom)
+static elf_errorstatus xc_dom_parse_elf_kernel(struct xc_dom_image *dom)
+ /*
+ * This function sometimes returns -1 for error and sometimes
+ * an errno value. WTF?
+ */
{
struct elf_binary *elf;
- int rc;
+ elf_errorstatus rc;
rc = check_elf_kernel(dom, 1);
if ( rc != 0 )
@@ -350,7 +354,7 @@ out:
return rc;
}
-static int xc_dom_load_elf_kernel(struct xc_dom_image *dom)
+static elf_errorstatus xc_dom_load_elf_kernel(struct xc_dom_image *dom)
{
struct elf_binary *elf = dom->private_loader;
xen_pfn_t pages;
diff --git a/tools/xcutils/readnotes.c b/tools/xcutils/readnotes.c
index b940a36..543e0f5 100644
--- a/tools/xcutils/readnotes.c
+++ b/tools/xcutils/readnotes.c
@@ -28,7 +28,7 @@ static void print_numeric_note(const char *prefix, struct
elf_binary *elf,
ELF_HANDLE_DECL(elf_note) note)
{
uint64_t value = elf_note_numeric(elf, note);
- int descsz = elf_uval(elf, note, descsz);
+ unsigned descsz = elf_uval(elf, note, descsz);
printf("%s: %#*" PRIx64 " (%d bytes)\n",
prefix, 2+2*descsz, value, descsz);
@@ -37,7 +37,7 @@ static void print_numeric_note(const char *prefix, struct
elf_binary *elf,
static void print_l1_mfn_valid_note(const char *prefix, struct elf_binary *elf,
ELF_HANDLE_DECL(elf_note) note)
{
- int descsz = elf_uval(elf, note, descsz);
+ unsigned descsz = elf_uval(elf, note, descsz);
ELF_PTRVAL_CONST_VOID desc = elf_note_desc(elf, note);
/* XXX should be able to cope with a list of values. */
@@ -57,10 +57,10 @@ static void print_l1_mfn_valid_note(const char *prefix,
struct elf_binary *elf,
}
-static int print_notes(struct elf_binary *elf, ELF_HANDLE_DECL(elf_note)
start, ELF_HANDLE_DECL(elf_note) end)
+static unsigned print_notes(struct elf_binary *elf, ELF_HANDLE_DECL(elf_note)
start, ELF_HANDLE_DECL(elf_note) end)
{
ELF_HANDLE_DECL(elf_note) note;
- int notes_found = 0;
+ unsigned notes_found = 0;
const char *this_note_name;
for ( note = start; ELF_HANDLE_PTRVAL(note) < ELF_HANDLE_PTRVAL(end);
note = elf_note_next(elf, note) )
@@ -119,7 +119,7 @@ static int print_notes(struct elf_binary *elf,
ELF_HANDLE_DECL(elf_note) start,
break;
default:
printf("unknown note type %#x\n",
- (int)elf_uval(elf, note, type));
+ (unsigned)elf_uval(elf, note, type));
break;
}
}
@@ -129,12 +129,13 @@ static int print_notes(struct elf_binary *elf,
ELF_HANDLE_DECL(elf_note) start,
int main(int argc, char **argv)
{
const char *f;
- int fd,h,size,usize,count;
+ int fd;
+ unsigned h,size,usize,count;
void *image,*tmp;
struct stat st;
struct elf_binary elf;
ELF_HANDLE_DECL(elf_shdr) shdr;
- int notes_found = 0;
+ unsigned notes_found = 0;
if (argc != 2)
{
diff --git a/xen/common/libelf/Makefile b/xen/common/libelf/Makefile
index 854e738..e788705 100644
--- a/xen/common/libelf/Makefile
+++ b/xen/common/libelf/Makefile
@@ -2,6 +2,8 @@ obj-y := libelf.o
SECTIONS := text data rodata $(foreach n,1 2 4 8,rodata.str1.$(n)) $(foreach
r,rel rel.ro,data.$(r) data.$(r).local)
+CFLAGS += -Wno-pointer-sign
+
libelf.o: libelf-temp.o Makefile
$(OBJCOPY) $(foreach s,$(SECTIONS),--rename-section .$(s)=.init.$(s))
$< $@
diff --git a/xen/common/libelf/libelf-dominfo.c
b/xen/common/libelf/libelf-dominfo.c
index 3a0db85..6054e40 100644
--- a/xen/common/libelf/libelf-dominfo.c
+++ b/xen/common/libelf/libelf-dominfo.c
@@ -28,15 +28,15 @@ static const char *const elf_xen_feature_names[] = {
[XENFEAT_supervisor_mode_kernel] = "supervisor_mode_kernel",
[XENFEAT_pae_pgdir_above_4gb] = "pae_pgdir_above_4gb"
};
-static const int elf_xen_features =
+static const unsigned elf_xen_features =
sizeof(elf_xen_feature_names) / sizeof(elf_xen_feature_names[0]);
-int elf_xen_parse_features(const char *features,
+elf_errorstatus elf_xen_parse_features(const char *features,
uint32_t *supported,
uint32_t *required)
{
- char feature[64];
- int pos, len, i;
+ unsigned char feature[64];
+ unsigned pos, len, i;
if ( features == NULL )
return 0;
@@ -92,7 +92,7 @@ int elf_xen_parse_features(const char *features,
/* ------------------------------------------------------------------------ */
/* xen elf notes */
-int elf_xen_parse_note(struct elf_binary *elf,
+elf_errorstatus elf_xen_parse_note(struct elf_binary *elf,
struct elf_dom_parms *parms,
ELF_HANDLE_DECL(elf_note) note)
{
@@ -121,7 +121,7 @@ int elf_xen_parse_note(struct elf_binary *elf,
const char *str = NULL;
uint64_t val = 0;
- int type = elf_uval(elf, note, type);
+ unsigned type = elf_uval(elf, note, type);
if ( (type >= sizeof(note_desc) / sizeof(note_desc[0])) ||
(note_desc[type].name == NULL) )
@@ -206,12 +206,14 @@ int elf_xen_parse_note(struct elf_binary *elf,
return 0;
}
-static int elf_xen_parse_notes(struct elf_binary *elf,
+#define ELF_NOTE_INVALID (~0U)
+
+static unsigned elf_xen_parse_notes(struct elf_binary *elf,
struct elf_dom_parms *parms,
ELF_PTRVAL_CONST_VOID start,
ELF_PTRVAL_CONST_VOID end)
{
- int xen_elfnotes = 0;
+ unsigned xen_elfnotes = 0;
ELF_HANDLE_DECL(elf_note) note;
const char *note_name;
@@ -227,7 +229,7 @@ static int elf_xen_parse_notes(struct elf_binary *elf,
if ( strcmp(note_name, "Xen") )
continue;
if ( elf_xen_parse_note(elf, parms, note) )
- return -1;
+ return ELF_NOTE_INVALID;
xen_elfnotes++;
}
return xen_elfnotes;
@@ -236,12 +238,12 @@ static int elf_xen_parse_notes(struct elf_binary *elf,
/* ------------------------------------------------------------------------ */
/* __xen_guest section */
-int elf_xen_parse_guest_info(struct elf_binary *elf,
+elf_errorstatus elf_xen_parse_guest_info(struct elf_binary *elf,
struct elf_dom_parms *parms)
{
ELF_PTRVAL_CONST_CHAR h;
- char name[32], value[128];
- int len;
+ unsigned char name[32], value[128];
+ unsigned len;
h = parms->guest_info;
#define STAR(h) (elf_access_unsigned(elf, (h), 0, 1))
@@ -324,13 +326,13 @@ int elf_xen_parse_guest_info(struct elf_binary *elf,
/* ------------------------------------------------------------------------ */
/* sanity checks */
-static int elf_xen_note_check(struct elf_binary *elf,
+static elf_errorstatus elf_xen_note_check(struct elf_binary *elf,
struct elf_dom_parms *parms)
{
if ( (ELF_PTRVAL_INVALID(parms->elf_note_start)) &&
(ELF_PTRVAL_INVALID(parms->guest_info)) )
{
- int machine = elf_uval(elf, elf->ehdr, e_machine);
+ unsigned machine = elf_uval(elf, elf->ehdr, e_machine);
if ( (machine == EM_386) || (machine == EM_X86_64) )
{
elf_err(elf, "%s: ERROR: Not a Xen-ELF image: "
@@ -362,7 +364,7 @@ static int elf_xen_note_check(struct elf_binary *elf,
return 0;
}
-static int elf_xen_addr_calc_check(struct elf_binary *elf,
+static elf_errorstatus elf_xen_addr_calc_check(struct elf_binary *elf,
struct elf_dom_parms *parms)
{
if ( (parms->elf_paddr_offset != UNSET_ADDR) &&
@@ -448,13 +450,13 @@ static int elf_xen_addr_calc_check(struct elf_binary *elf,
/* ------------------------------------------------------------------------ */
/* glue it all together ... */
-int elf_xen_parse(struct elf_binary *elf,
+elf_errorstatus elf_xen_parse(struct elf_binary *elf,
struct elf_dom_parms *parms)
{
ELF_HANDLE_DECL(elf_shdr) shdr;
ELF_HANDLE_DECL(elf_phdr) phdr;
- int xen_elfnotes = 0;
- int i, count, rc;
+ unsigned xen_elfnotes = 0;
+ unsigned i, count, more_notes;
elf_memset_unchecked(parms, 0, sizeof(*parms));
parms->virt_base = UNSET_ADDR;
@@ -479,13 +481,13 @@ int elf_xen_parse(struct elf_binary *elf,
if (elf_uval(elf, phdr, p_offset) == 0)
continue;
- rc = elf_xen_parse_notes(elf, parms,
+ more_notes = elf_xen_parse_notes(elf, parms,
elf_segment_start(elf, phdr),
elf_segment_end(elf, phdr));
- if ( rc == -1 )
+ if ( more_notes == ELF_NOTE_INVALID )
return -1;
- xen_elfnotes += rc;
+ xen_elfnotes += more_notes;
}
/*
@@ -502,17 +504,17 @@ int elf_xen_parse(struct elf_binary *elf,
if ( elf_uval(elf, shdr, sh_type) != SHT_NOTE )
continue;
- rc = elf_xen_parse_notes(elf, parms,
+ more_notes = elf_xen_parse_notes(elf, parms,
elf_section_start(elf, shdr),
elf_section_end(elf, shdr));
- if ( rc == -1 )
+ if ( more_notes == ELF_NOTE_INVALID )
return -1;
- if ( xen_elfnotes == 0 && rc > 0 )
+ if ( xen_elfnotes == 0 && more_notes > 0 )
elf_msg(elf, "%s: using notes from SHT_NOTE section\n",
__FUNCTION__);
- xen_elfnotes += rc;
+ xen_elfnotes += more_notes;
}
}
diff --git a/xen/common/libelf/libelf-loader.c
b/xen/common/libelf/libelf-loader.c
index 5895a6b..459c973 100644
--- a/xen/common/libelf/libelf-loader.c
+++ b/xen/common/libelf/libelf-loader.c
@@ -20,7 +20,7 @@
/* ------------------------------------------------------------------------ */
-int elf_init(struct elf_binary *elf, const char *image_input, size_t size)
+elf_errorstatus elf_init(struct elf_binary *elf, const char *image_input,
size_t size)
{
ELF_HANDLE_DECL(elf_shdr) shdr;
uint64_t i, count, section, offset;
@@ -121,7 +121,7 @@ void elf_parse_bsdsyms(struct elf_binary *elf, uint64_t
pstart)
{
uint64_t sz;
ELF_HANDLE_DECL(elf_shdr) shdr;
- int i, type;
+ unsigned i, type;
if ( !ELF_HANDLE_VALID(elf->sym_tab) )
return;
@@ -157,7 +157,7 @@ static void elf_load_bsdsyms(struct elf_binary *elf)
ELF_PTRVAL_VOID symbase;
ELF_PTRVAL_VOID symtab_addr;
ELF_HANDLE_DECL_NONCONST(elf_shdr) shdr;
- int i, type;
+ unsigned i, type;
if ( !elf->bsd_symtab_pstart )
return;
@@ -190,7 +190,7 @@ do { \
elf_memcpy_safe(elf, ELF_HANDLE_PTRVAL(shdr),
ELF_IMAGE_BASE(elf) + elf_uval(elf, elf->ehdr, e_shoff),
sz);
- maxva = ELF_OBSOLETE_VOIDP_CAST elf_round_up(elf, (long)maxva + sz);
+ maxva = ELF_OBSOLETE_VOIDP_CAST elf_round_up(elf, (unsigned long)maxva +
sz);
for ( i = 0; i < elf_shdr_count(elf); i++ )
{
@@ -203,10 +203,10 @@ do { \
elf_memcpy_safe(elf, maxva, elf_section_start(elf, shdr), sz);
/* Mangled to be based on ELF header location. */
elf_hdr_elm(elf, shdr, sh_offset, maxva - symtab_addr);
- maxva = ELF_OBSOLETE_VOIDP_CAST elf_round_up(elf, (long)maxva +
sz);
+ maxva = ELF_OBSOLETE_VOIDP_CAST elf_round_up(elf, (unsigned
long)maxva + sz);
}
shdr = ELF_MAKE_HANDLE(elf_shdr, ELF_HANDLE_PTRVAL(shdr) +
- (long)elf_uval(elf, elf->ehdr, e_shentsize));
+ (unsigned long)elf_uval(elf, elf->ehdr,
e_shentsize));
}
/* Write down the actual sym size. */
diff --git a/xen/common/libelf/libelf-tools.c b/xen/common/libelf/libelf-tools.c
index 78b2f99..4fb2d38 100644
--- a/xen/common/libelf/libelf-tools.c
+++ b/xen/common/libelf/libelf-tools.c
@@ -122,19 +122,19 @@ uint64_t elf_access_unsigned(struct elf_binary * elf,
elf_ptrval base,
uint64_t elf_round_up(struct elf_binary *elf, uint64_t addr)
{
- int elf_round = (elf_64bit(elf) ? 8 : 4) - 1;
+ uint64_t elf_round = (elf_64bit(elf) ? 8 : 4) - 1;
return (addr + elf_round) & ~elf_round;
}
/* ------------------------------------------------------------------------ */
-int elf_shdr_count(struct elf_binary *elf)
+unsigned elf_shdr_count(struct elf_binary *elf)
{
return elf_uval(elf, elf->ehdr, e_shnum);
}
-int elf_phdr_count(struct elf_binary *elf)
+unsigned elf_phdr_count(struct elf_binary *elf)
{
return elf_uval(elf, elf->ehdr, e_phnum);
}
@@ -144,7 +144,7 @@ ELF_HANDLE_DECL(elf_shdr) elf_shdr_by_name(struct
elf_binary *elf, const char *n
uint64_t count = elf_shdr_count(elf);
ELF_HANDLE_DECL(elf_shdr) shdr;
const char *sname;
- int i;
+ unsigned i;
for ( i = 0; i < count; i++ )
{
@@ -156,7 +156,7 @@ ELF_HANDLE_DECL(elf_shdr) elf_shdr_by_name(struct
elf_binary *elf, const char *n
return ELF_INVALID_HANDLE(elf_shdr);
}
-ELF_HANDLE_DECL(elf_shdr) elf_shdr_by_index(struct elf_binary *elf, int index)
+ELF_HANDLE_DECL(elf_shdr) elf_shdr_by_index(struct elf_binary *elf, unsigned
index)
{
uint64_t count = elf_shdr_count(elf);
ELF_PTRVAL_CONST_VOID ptr;
@@ -170,7 +170,7 @@ ELF_HANDLE_DECL(elf_shdr) elf_shdr_by_index(struct
elf_binary *elf, int index)
return ELF_MAKE_HANDLE(elf_shdr, ptr);
}
-ELF_HANDLE_DECL(elf_phdr) elf_phdr_by_index(struct elf_binary *elf, int index)
+ELF_HANDLE_DECL(elf_phdr) elf_phdr_by_index(struct elf_binary *elf, unsigned
index)
{
uint64_t count = elf_uval(elf, elf->ehdr, e_phnum);
ELF_PTRVAL_CONST_VOID ptr;
@@ -264,7 +264,7 @@ ELF_HANDLE_DECL(elf_sym) elf_sym_by_name(struct elf_binary
*elf, const char *sym
return ELF_INVALID_HANDLE(elf_sym);
}
-ELF_HANDLE_DECL(elf_sym) elf_sym_by_index(struct elf_binary *elf, int index)
+ELF_HANDLE_DECL(elf_sym) elf_sym_by_index(struct elf_binary *elf, unsigned
index)
{
ELF_PTRVAL_CONST_VOID ptr = elf_section_start(elf, elf->sym_tab);
ELF_HANDLE_DECL(elf_sym) sym;
@@ -280,7 +280,7 @@ const char *elf_note_name(struct elf_binary *elf,
ELF_HANDLE_DECL(elf_note) note
ELF_PTRVAL_CONST_VOID elf_note_desc(struct elf_binary *elf,
ELF_HANDLE_DECL(elf_note) note)
{
- int namesz = (elf_uval(elf, note, namesz) + 3) & ~3;
+ unsigned namesz = (elf_uval(elf, note, namesz) + 3) & ~3;
return ELF_HANDLE_PTRVAL(note) + elf_size(elf, note) + namesz;
}
@@ -288,7 +288,7 @@ ELF_PTRVAL_CONST_VOID elf_note_desc(struct elf_binary *elf,
ELF_HANDLE_DECL(elf_
uint64_t elf_note_numeric(struct elf_binary *elf, ELF_HANDLE_DECL(elf_note)
note)
{
ELF_PTRVAL_CONST_VOID desc = elf_note_desc(elf, note);
- int descsz = elf_uval(elf, note, descsz);
+ unsigned descsz = elf_uval(elf, note, descsz);
switch (descsz)
{
@@ -303,8 +303,8 @@ uint64_t elf_note_numeric(struct elf_binary *elf,
ELF_HANDLE_DECL(elf_note) note
}
ELF_HANDLE_DECL(elf_note) elf_note_next(struct elf_binary *elf,
ELF_HANDLE_DECL(elf_note) note)
{
- int namesz = (elf_uval(elf, note, namesz) + 3) & ~3;
- int descsz = (elf_uval(elf, note, descsz) + 3) & ~3;
+ unsigned namesz = (elf_uval(elf, note, namesz) + 3) & ~3;
+ unsigned descsz = (elf_uval(elf, note, descsz) + 3) & ~3;
return ELF_MAKE_HANDLE(elf_note, ELF_HANDLE_PTRVAL(note) + elf_size(elf,
note) + namesz + descsz);
}
diff --git a/xen/include/xen/libelf.h b/xen/include/xen/libelf.h
index 152a33d..9e709c2 100644
--- a/xen/include/xen/libelf.h
+++ b/xen/include/xen/libelf.h
@@ -31,6 +31,9 @@
#include <stdbool.h>
+typedef int elf_errorstatus; /* 0: ok; -ve (normally -1): error */
+typedef int elf_negerrnoval; /* 0: ok; -EFOO: error */
+
#undef ELFSIZE
#include "elfstructs.h"
#ifdef __XEN__
@@ -330,12 +333,12 @@ bool elf_access_ok(struct elf_binary * elf,
/* ------------------------------------------------------------------------ */
/* xc_libelf_tools.c */
-int elf_shdr_count(struct elf_binary *elf);
-int elf_phdr_count(struct elf_binary *elf);
+unsigned elf_shdr_count(struct elf_binary *elf);
+unsigned elf_phdr_count(struct elf_binary *elf);
ELF_HANDLE_DECL(elf_shdr) elf_shdr_by_name(struct elf_binary *elf, const char
*name);
-ELF_HANDLE_DECL(elf_shdr) elf_shdr_by_index(struct elf_binary *elf, int index);
-ELF_HANDLE_DECL(elf_phdr) elf_phdr_by_index(struct elf_binary *elf, int index);
+ELF_HANDLE_DECL(elf_shdr) elf_shdr_by_index(struct elf_binary *elf, unsigned
index);
+ELF_HANDLE_DECL(elf_phdr) elf_phdr_by_index(struct elf_binary *elf, unsigned
index);
const char *elf_section_name(struct elf_binary *elf, ELF_HANDLE_DECL(elf_shdr)
shdr); /* might return NULL if inputs are invalid */
ELF_PTRVAL_CONST_VOID elf_section_start(struct elf_binary *elf,
ELF_HANDLE_DECL(elf_shdr) shdr);
@@ -345,7 +348,7 @@ ELF_PTRVAL_CONST_VOID elf_segment_start(struct elf_binary
*elf, ELF_HANDLE_DECL(
ELF_PTRVAL_CONST_VOID elf_segment_end(struct elf_binary *elf,
ELF_HANDLE_DECL(elf_phdr) phdr);
ELF_HANDLE_DECL(elf_sym) elf_sym_by_name(struct elf_binary *elf, const char
*symbol);
-ELF_HANDLE_DECL(elf_sym) elf_sym_by_index(struct elf_binary *elf, int index);
+ELF_HANDLE_DECL(elf_sym) elf_sym_by_index(struct elf_binary *elf, unsigned
index);
const char *elf_note_name(struct elf_binary *elf, ELF_HANDLE_DECL(elf_note)
note); /* may return NULL */
ELF_PTRVAL_CONST_VOID elf_note_desc(struct elf_binary *elf,
ELF_HANDLE_DECL(elf_note) note);
@@ -360,7 +363,7 @@ bool elf_phdr_is_loadable(struct elf_binary *elf,
ELF_HANDLE_DECL(elf_phdr) phdr
/* ------------------------------------------------------------------------ */
/* xc_libelf_loader.c */
-int elf_init(struct elf_binary *elf, const char *image, size_t size);
+elf_errorstatus elf_init(struct elf_binary *elf, const char *image, size_t
size);
/*
* image and size must be correct. They will be recorded in
* *elf, and must remain valid while the elf is in use.
@@ -386,7 +389,7 @@ const char *elf_check_broken(const struct elf_binary *elf);
/* NULL means OK */
/* ------------------------------------------------------------------------ */
/* xc_libelf_relocate.c */
-int elf_reloc(struct elf_binary *elf);
+elf_errorstatus elf_reloc(struct elf_binary *elf);
/* ------------------------------------------------------------------------ */
/* xc_libelf_dominfo.c */
@@ -420,7 +423,7 @@ struct elf_dom_parms {
char guest_ver[16];
char xen_ver[16];
char loader[16];
- int pae;
+ int pae; /* some kind of enum apparently */
bool bsd_symtab;
uint64_t virt_base;
uint64_t virt_entry;
--
1.7.2.5
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