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0.173-1 - New upstream release

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- More fixes for crashes and hangs found by afl-fuzz. In particular
  various functions now detect and break infinite loops caused by bad
  DIE tree cycles.
- readelf: Will now lookup the size and signedness of constant value
  types to display them correctly (and not just how they were encoded).
- libdw: New function dwarf_next_lines to read CU-less .debug_line data.
  dwarf_begin_elf now accepts ELF files containing just .debug_line
  or .debug_frame sections (which can be read without needing a DIE
  tree from the .debug_info section).
  Removed dwarf_getscn_info, which was never implemented.
- backends: Handle BPF simple relocations.
  The RISCV backends now handles ABI specific CFI and knows about
  RISCV register types and names.
This commit is contained in:
Mark Wielaard 2018-06-29 22:37:37 +02:00
parent b1a53d2b76
commit e2cfd39484
4 changed files with 20 additions and 405 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
.gitignore vendored
View File

@ -13,3 +13,4 @@
/elfutils-0.170.tar.bz2
/elfutils-0.171.tar.bz2
/elfutils-0.172.tar.bz2
/elfutils-0.173.tar.bz2

400
elfutils-0.172-robustify.patch
View File

@ -1,400 +0,0 @@
Upstream commits since 0.172:
b4dced3 readelf: While printing .debug_loc make sure that next_off doesn't overflow.
bb11e36 libdw: Make __libdw_dieabbrev more robust on failure.
3647b5b readelf: Make sure print_form_data always consumes DW_FORM_strx[1234] data.
eaaf908 readelf: Check there are at least 4 bytes available for DWARF_FORM_block4.
0d93f49 libdw, readelf: Don't handle DW_FORM_data16 as expression block/location.
9495c26 libdw: aggregate_size check NULL result from get_type.
e636112 libdw: dwarf_peel_type break long chains/cycles.
5956b8a libdw: Break dwarf_aggregate_size recursion because of type cycles.
ca0d831 libelf: Don't return unaligned data returned from elf_getdata[_rawchunk].
diff --git a/libdw/dwarf_aggregate_size.c b/libdw/dwarf_aggregate_size.c
index 6e50185..75105e4 100644
--- a/libdw/dwarf_aggregate_size.c
+++ b/libdw/dwarf_aggregate_size.c
@@ -46,13 +46,17 @@ get_type (Dwarf_Die *die, Dwarf_Attribute *attr_mem, Dwarf_Die *type_mem)
return type;
}
+static int aggregate_size (Dwarf_Die *die, Dwarf_Word *size,
+ Dwarf_Die *type_mem, int depth);
+
static int
array_size (Dwarf_Die *die, Dwarf_Word *size,
- Dwarf_Attribute *attr_mem, Dwarf_Die *type_mem)
+ Dwarf_Attribute *attr_mem, int depth)
{
Dwarf_Word eltsize;
- if (INTUSE(dwarf_aggregate_size) (get_type (die, attr_mem, type_mem),
- &eltsize) != 0)
+ Dwarf_Die type_mem, aggregate_type_mem;
+ if (aggregate_size (get_type (die, attr_mem, &type_mem), &eltsize,
+ &aggregate_type_mem, depth) != 0)
return -1;
/* An array can have DW_TAG_subrange_type or DW_TAG_enumeration_type
@@ -167,21 +171,30 @@ array_size (Dwarf_Die *die, Dwarf_Word *size,
}
static int
-aggregate_size (Dwarf_Die *die, Dwarf_Word *size, Dwarf_Die *type_mem)
+aggregate_size (Dwarf_Die *die, Dwarf_Word *size,
+ Dwarf_Die *type_mem, int depth)
{
Dwarf_Attribute attr_mem;
+/* Arrays of arrays of subrange types of arrays... Don't recurse too deep. */
+#define MAX_DEPTH 256
+ if (die == NULL || depth++ >= MAX_DEPTH)
+ return -1;
+
if (INTUSE(dwarf_attr_integrate) (die, DW_AT_byte_size, &attr_mem) != NULL)
return INTUSE(dwarf_formudata) (&attr_mem, size);
switch (INTUSE(dwarf_tag) (die))
{
case DW_TAG_subrange_type:
- return aggregate_size (get_type (die, &attr_mem, type_mem),
- size, type_mem); /* Tail call. */
+ {
+ Dwarf_Die aggregate_type_mem;
+ return aggregate_size (get_type (die, &attr_mem, type_mem),
+ size, &aggregate_type_mem, depth);
+ }
case DW_TAG_array_type:
- return array_size (die, size, &attr_mem, type_mem);
+ return array_size (die, size, &attr_mem, depth);
/* Assume references and pointers have pointer size if not given an
explicit DW_AT_byte_size. */
@@ -204,7 +217,7 @@ dwarf_aggregate_size (Dwarf_Die *die, Dwarf_Word *size)
if (INTUSE (dwarf_peel_type) (die, &die_mem) != 0)
return -1;
- return aggregate_size (&die_mem, size, &type_mem);
+ return aggregate_size (&die_mem, size, &type_mem, 0);
}
INTDEF (dwarf_aggregate_size)
OLD_VERSION (dwarf_aggregate_size, ELFUTILS_0.144)
diff --git a/libdw/dwarf_getlocation.c b/libdw/dwarf_getlocation.c
index 7f294fe..fc59a2a 100644
--- a/libdw/dwarf_getlocation.c
+++ b/libdw/dwarf_getlocation.c
@@ -174,6 +174,8 @@ check_constant_offset (Dwarf_Attribute *attr,
default:
return 1;
+ /* Note, we don't regard DW_FORM_data16 as a constant form,
+ even though technically it is according to the standard. */
case DW_FORM_data1:
case DW_FORM_data2:
case DW_FORM_data4:
@@ -665,7 +667,13 @@ dwarf_getlocation (Dwarf_Attribute *attr, Dwarf_Op **llbuf, size_t *listlen)
if (result != 1)
return result;
- /* If it has a block form, it's a single location expression. */
+ /* If it has a block form, it's a single location expression.
+ Except for DW_FORM_data16, which is a 128bit constant. */
+ if (attr->form == DW_FORM_data16)
+ {
+ __libdw_seterrno (DWARF_E_NO_BLOCK);
+ return -1;
+ }
Dwarf_Block block;
if (INTUSE(dwarf_formblock) (attr, &block) != 0)
return -1;
@@ -863,9 +871,11 @@ dwarf_getlocation_addr (Dwarf_Attribute *attr, Dwarf_Addr address,
if (llbufs == NULL)
maxlocs = SIZE_MAX;
- /* If it has a block form, it's a single location expression. */
+ /* If it has a block form, it's a single location expression.
+ Except for DW_FORM_data16, which is a 128bit constant. */
Dwarf_Block block;
- if (INTUSE(dwarf_formblock) (attr, &block) == 0)
+ if (attr->form != DW_FORM_data16
+ && INTUSE(dwarf_formblock) (attr, &block) == 0)
{
if (maxlocs == 0)
return 0;
@@ -876,11 +886,14 @@ dwarf_getlocation_addr (Dwarf_Attribute *attr, Dwarf_Addr address,
return listlens[0] == 0 ? 0 : 1;
}
- int error = INTUSE(dwarf_errno) ();
- if (unlikely (error != DWARF_E_NO_BLOCK))
+ if (attr->form != DW_FORM_data16)
{
- __libdw_seterrno (error);
- return -1;
+ int error = INTUSE(dwarf_errno) ();
+ if (unlikely (error != DWARF_E_NO_BLOCK))
+ {
+ __libdw_seterrno (error);
+ return -1;
+ }
}
int result = check_constant_offset (attr, &llbufs[0], &listlens[0]);
@@ -938,9 +951,11 @@ dwarf_getlocations (Dwarf_Attribute *attr, ptrdiff_t offset, Dwarf_Addr *basep,
if (offset == 0)
{
- /* If it has a block form, it's a single location expression. */
+ /* If it has a block form, it's a single location expression.
+ Except for DW_FORM_data16, which is a 128bit constant. */
Dwarf_Block block;
- if (INTUSE(dwarf_formblock) (attr, &block) == 0)
+ if (attr->form != DW_FORM_data16
+ && INTUSE(dwarf_formblock) (attr, &block) == 0)
{
if (getlocation (attr->cu, &block, expr, exprlen,
cu_sec_idx (attr->cu)) != 0)
@@ -952,11 +967,14 @@ dwarf_getlocations (Dwarf_Attribute *attr, ptrdiff_t offset, Dwarf_Addr *basep,
return 1;
}
- int error = INTUSE(dwarf_errno) ();
- if (unlikely (error != DWARF_E_NO_BLOCK))
+ if (attr->form != DW_FORM_data16)
{
- __libdw_seterrno (error);
- return -1;
+ int error = INTUSE(dwarf_errno) ();
+ if (unlikely (error != DWARF_E_NO_BLOCK))
+ {
+ __libdw_seterrno (error);
+ return -1;
+ }
}
int result = check_constant_offset (attr, expr, exprlen);
diff --git a/libdw/dwarf_peel_type.c b/libdw/dwarf_peel_type.c
index 6bbfd42..59fc6f1 100644
--- a/libdw/dwarf_peel_type.c
+++ b/libdw/dwarf_peel_type.c
@@ -46,14 +46,19 @@ dwarf_peel_type (Dwarf_Die *die, Dwarf_Die *result)
*result = *die;
tag = INTUSE (dwarf_tag) (result);
- while (tag == DW_TAG_typedef
- || tag == DW_TAG_const_type
- || tag == DW_TAG_volatile_type
- || tag == DW_TAG_restrict_type
- || tag == DW_TAG_atomic_type
- || tag == DW_TAG_immutable_type
- || tag == DW_TAG_packed_type
- || tag == DW_TAG_shared_type)
+
+/* Stack 8 of all these modifiers, after that it gets silly. */
+#define MAX_DEPTH (8 * 8)
+ int max_depth = MAX_DEPTH;
+ while ((tag == DW_TAG_typedef
+ || tag == DW_TAG_const_type
+ || tag == DW_TAG_volatile_type
+ || tag == DW_TAG_restrict_type
+ || tag == DW_TAG_atomic_type
+ || tag == DW_TAG_immutable_type
+ || tag == DW_TAG_packed_type
+ || tag == DW_TAG_shared_type)
+ && max_depth-- > 0)
{
Dwarf_Attribute attr_mem;
Dwarf_Attribute *attr = INTUSE (dwarf_attr_integrate) (result, DW_AT_type,
@@ -67,7 +72,7 @@ dwarf_peel_type (Dwarf_Die *die, Dwarf_Die *result)
tag = INTUSE (dwarf_tag) (result);
}
- if (tag == DW_TAG_invalid)
+ if (tag == DW_TAG_invalid || max_depth <= 0)
return -1;
return 0;
diff --git a/libdw/libdwP.h b/libdw/libdwP.h
index 3d8e145..eebb7d1 100644
--- a/libdw/libdwP.h
+++ b/libdw/libdwP.h
@@ -653,8 +653,9 @@ __libdw_dieabbrev (Dwarf_Die *die, const unsigned char **readp)
/* Get the abbreviation code. */
unsigned int code;
const unsigned char *addr = die->addr;
- if (die->cu == NULL || addr >= (const unsigned char *) die->cu->endp)
- return DWARF_END_ABBREV;
+ if (unlikely (die->cu == NULL
+ || addr >= (const unsigned char *) die->cu->endp))
+ return die->abbrev = DWARF_END_ABBREV;
get_uleb128 (code, addr, die->cu->endp);
if (readp != NULL)
*readp = addr;
diff --git a/libdw/memory-access.h b/libdw/memory-access.h
index 22918cb..a39ad6d 100644
--- a/libdw/memory-access.h
+++ b/libdw/memory-access.h
@@ -362,6 +362,11 @@ read_3ubyte_unaligned (Dwarf *dbg, const unsigned char *p)
}
+#define read_3ubyte_unaligned_inc(Dbg, Addr) \
+ ({ uint32_t t_ = read_2ubyte_unaligned (Dbg, Addr); \
+ Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 3); \
+ t_; })
+
#define read_addr_unaligned_inc(Nbytes, Dbg, Addr) \
(assert ((Nbytes) == 4 || (Nbytes) == 8), \
((Nbytes) == 4 ? read_4ubyte_unaligned_inc (Dbg, Addr) \
diff --git a/libelf/elf_getdata.c b/libelf/elf_getdata.c
index 97c503b..278dfa8 100644
--- a/libelf/elf_getdata.c
+++ b/libelf/elf_getdata.c
@@ -76,7 +76,6 @@ static const Elf_Type shtype_map[EV_NUM - 1][TYPEIDX (SHT_HISUNW) + 1] =
}
};
-#if !ALLOW_UNALIGNED
/* Associate libelf types with their internal alignment requirements. */
const uint_fast8_t __libelf_type_aligns[EV_NUM - 1][ELFCLASSNUM - 1][ELF_T_NUM] =
{
@@ -115,7 +114,6 @@ const uint_fast8_t __libelf_type_aligns[EV_NUM - 1][ELFCLASSNUM - 1][ELF_T_NUM]
}
# undef TYPE_ALIGNS
};
-#endif
Elf_Type
@@ -173,8 +171,7 @@ convert_data (Elf_Scn *scn, int version __attribute__ ((unused)), int eclass,
/* Make sure the source is correctly aligned for the conversion
function to directly access the data elements. */
char *rawdata_source;
- if (ALLOW_UNALIGNED ||
- ((((size_t) (char *) scn->rawdata_base)) & (align - 1)) == 0)
+ if (((((size_t) (char *) scn->rawdata_base)) & (align - 1)) == 0)
rawdata_source = scn->rawdata_base;
else
{
diff --git a/libelf/elf_getdata_rawchunk.c b/libelf/elf_getdata_rawchunk.c
index 31b2fe7..d0c0b75 100644
--- a/libelf/elf_getdata_rawchunk.c
+++ b/libelf/elf_getdata_rawchunk.c
@@ -80,8 +80,7 @@ elf_getdata_rawchunk (Elf *elf, off_t offset, size_t size, Elf_Type type)
{
/* If the file is mmap'ed we can use it directly, if aligned for type. */
char *rawdata = elf->map_address + elf->start_offset + offset;
- if (ALLOW_UNALIGNED ||
- ((uintptr_t) rawdata & (align - 1)) == 0)
+ if (((uintptr_t) rawdata & (align - 1)) == 0)
rawchunk = rawdata;
else
{
diff --git a/libelf/libelfP.h b/libelf/libelfP.h
index ca805ac..ed216c8 100644
--- a/libelf/libelfP.h
+++ b/libelf/libelfP.h
@@ -443,15 +443,11 @@ extern int __libelf_version_initialized attribute_hidden;
# define LIBELF_EV_IDX (__libelf_version - 1)
#endif
-#if !ALLOW_UNALIGNED
/* Array with alignment requirements of the internal types indexed by ELF
version, binary class, and type. */
extern const uint_fast8_t __libelf_type_aligns[EV_NUM - 1][ELFCLASSNUM - 1][ELF_T_NUM] attribute_hidden;
# define __libelf_type_align(class, type) \
(__libelf_type_aligns[LIBELF_EV_IDX][class - 1][type] ?: 1)
-#else
-# define __libelf_type_align(class, type) 1
-#endif
/* Given an Elf handle and a section type returns the Elf_Data d_type.
Should not be called when SHF_COMPRESSED is set, the d_type should
diff --git a/src/readelf.c b/src/readelf.c
index f185897..313f940 100644
--- a/src/readelf.c
+++ b/src/readelf.c
@@ -7403,11 +7403,16 @@ attr_callback (Dwarf_Attribute *attrp, void *arg)
case DW_AT_GNU_call_site_data_value:
case DW_AT_GNU_call_site_target:
case DW_AT_GNU_call_site_target_clobbered:
- putchar ('\n');
- print_ops (cbargs->dwflmod, cbargs->dbg,
- 12 + level * 2, 12 + level * 2,
- cbargs->version, cbargs->addrsize, cbargs->offset_size,
- attrp->cu, block.length, block.data);
+ if (form != DW_FORM_data16)
+ {
+ putchar ('\n');
+ print_ops (cbargs->dwflmod, cbargs->dbg,
+ 12 + level * 2, 12 + level * 2,
+ cbargs->version, cbargs->addrsize, cbargs->offset_size,
+ attrp->cu, block.length, block.data);
+ }
+ else
+ print_block (block.length, block.data);
break;
}
break;
@@ -7907,7 +7912,7 @@ print_form_data (Dwarf *dbg, int form, const unsigned char *readp,
break;
case DW_FORM_block4:
- if (readendp - readp < 2)
+ if (readendp - readp < 4)
goto invalid_data;
val = read_4ubyte_unaligned_inc (dbg, readp);
if ((size_t) (readendp - readp) < val)
@@ -7994,9 +7999,9 @@ print_form_data (Dwarf *dbg, int form, const unsigned char *readp,
{
Dwarf_Off idx;
if (offset_len == 8)
- idx = read_8ubyte_unaligned_inc (dbg, strreadp);
+ idx = read_8ubyte_unaligned (dbg, strreadp);
else
- idx = read_4ubyte_unaligned_inc (dbg, strreadp);
+ idx = read_4ubyte_unaligned (dbg, strreadp);
data = dbg->sectiondata[IDX_debug_str];
if (data == NULL || idx >= data->d_size
@@ -8013,25 +8018,25 @@ print_form_data (Dwarf *dbg, int form, const unsigned char *readp,
case DW_FORM_strx1:
if (readendp - readp < 1)
goto invalid_data;
- val = *readp;
+ val = *readp++;
goto strx_val;
case DW_FORM_strx2:
if (readendp - readp < 2)
goto invalid_data;
- val = read_2ubyte_unaligned (dbg, readp);
+ val = read_2ubyte_unaligned_inc (dbg, readp);
goto strx_val;
case DW_FORM_strx3:
if (readendp - readp < 3)
goto invalid_data;
- val = read_3ubyte_unaligned (dbg, readp);
+ val = read_3ubyte_unaligned_inc (dbg, readp);
goto strx_val;
case DW_FORM_strx4:
if (readendp - readp < 4)
goto invalid_data;
- val = read_4ubyte_unaligned (dbg, readp);
+ val = read_4ubyte_unaligned_inc (dbg, readp);
goto strx_val;
default:
@@ -9230,7 +9235,9 @@ print_debug_loc_section (Dwfl_Module *dwflmod,
listptr_idx);
const unsigned char *locp = readp;
const unsigned char *locendp;
- if (next_off == 0)
+ if (next_off == 0
+ || next_off > (size_t) (endp
+ - (const unsigned char *) data->d_buf))
locendp = endp;
else
locendp = (const unsigned char *) data->d_buf + next_off;

22
elfutils.spec
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@ -1,7 +1,7 @@
Name: elfutils
Summary: A collection of utilities and DSOs to handle ELF files and DWARF data
Version: 0.172
%global baserelease 2
Version: 0.173
%global baserelease 1
URL: http://elfutils.org/
%global source_url ftp://sourceware.org/pub/elfutils/%{version}/
License: GPLv3+ and (GPLv2+ or LGPLv3+)
@ -21,7 +21,6 @@ Source: %{?source_url}%{name}-%{version}.tar.bz2
# Patches
Patch1: elfutils-0.171-new-notes-hack.patch
Patch2: elfutils-0.172-robustify.patch
Requires: elfutils-libelf%{depsuffix} = %{version}-%{release}
Requires: elfutils-libs%{depsuffix} = %{version}-%{release}
@ -176,7 +175,6 @@ profiling) of processes.
# Apply patches
%patch1 -p1 -b .notes_hack
%patch2 -p1 -b .robustify
# In case the above patches added any new test scripts, make sure they
# are executable.
@ -317,6 +315,22 @@ fi
%endif
%changelog
* Fri Jun 29 2018 Mark Wielaard <mjw@fedoraproject.org> - 0.173-1
- New upstream release
- More fixes for crashes and hangs found by afl-fuzz. In particular
various functions now detect and break infinite loops caused by bad
DIE tree cycles.
- readelf: Will now lookup the size and signedness of constant value
types to display them correctly (and not just how they were encoded).
- libdw: New function dwarf_next_lines to read CU-less .debug_line data.
dwarf_begin_elf now accepts ELF files containing just .debug_line
or .debug_frame sections (which can be read without needing a DIE
tree from the .debug_info section).
Removed dwarf_getscn_info, which was never implemented.
- backends: Handle BPF simple relocations.
The RISCV backends now handles ABI specific CFI and knows about
RISCV register types and names.
* Wed Jun 20 2018 Mark Wielaard <mjw@fedoraproject.org> - 0.172-2
- Add elfutils-0.172-robustify.patch.

2
sources
View File

@ -1 +1 @@
SHA512 (elfutils-0.172.tar.bz2) = b2f491e976ef3067fe33ad22b3ef1952c47557571747899e94aee601bfeb95e8e1a91daad80a7950bee7feb42192769663db32eb65734ea5ffbc0b87cdad76b2
SHA512 (elfutils-0.173.tar.bz2) = 7f38e4ce2098b685f15030bf01f0a66a74aa32fbfcead0304c1d0e0a929b348a72f99e685cd4605465f4337393382112f64b8847e6c2f7cc1a57a4fd03d03eb3