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Abolish ELF_PTRVAL_[CONST_]{CHAR,VOID}; change uses to elf_ptrval.
Abolish ELF_HANDLE_DECL_NONCONST; change uses to ELF_HANDLE_DECL.
Abolish ELF_OBSOLETE_VOIDP_CAST; simply remove all uses.
No functional change. (Verified by diffing assembler output.)
This is part of the fix to a security issue, XSA-55.
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
v2: New patch.
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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.
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@eu.citrix.com>
Reviewed-by: George Dunlap <george.dunlap@eu.citrix.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
v8: Use "?!?!" to express consternation instead of a ruder phrase.
v5: Introduce ELF_NOTE_INVALID, instead of using a literal ~0U.
v4: Fix regression in elf_round_up; use uint64_t here.
v3: Changes to booleans split off into separate patch.
v2: BUGFIX: Eliminate conversion to int of return from elf_xen_parse_notes.
BUGFIX: Fix the one printf format thing which needs changing.
Remove irrelevant change to constify note_desc.name in libelf-dominfo.c.
In xc_dom_load_elf_symtab change one sizeof(int) to sizeof(unsigned).
Do not change type of 2nd argument to memset.
Provide seddery for easier review.
Style fix.
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This arranges that if the new pointer reference error checking
tripped, we actually get a message about it. In this patch these
messages do not change the actual return values from the various
functions: so pointer reference errors do not prevent loading. This
is for fear that some existing kernels might cause the code to make
these wild references, which would then break, which is not a good
thing in a security patch.
In xen/arch/x86/domain_build.c we have to introduce an "out" label and
change all of the "return rc" beyond the relevant point into "goto
out".
This is part of the fix to a security issue, XSA-55.
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Reviewed-by: George Dunlap <george.dunlap@eu.citrix.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
v5: Fix two whitespace errors.
v3.1:
Add error check to xc_dom_parse_elf_kernel.
Move check in xc_hvm_build_x86.c:setup_guest to right place.
v2 was Acked-by: Ian Campbell <ian.campbell@citrix.com>
v2 was Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
v2: Style fixes.
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It is not safe to simply take pointers into the ELF and use them as C
pointers. They might not be properly nul-terminated (and the pointers
might be wild).
So we are going to introduce a new function elf_strval for safely
getting strings. This will check that the addresses are in range and
that there is a proper nul-terminated string. Of course it might
discover that there isn't. In that case, it will be made to fail.
This means that elf_note_name might fail, too.
For the benefit of call sites which are just going to pass the value
to a printf-like function, we provide elf_strfmt which returns
"(invalid)" on failure rather than NULL.
In this patch we introduce dummy definitions of these functions. We
introduce calls to elf_strval and elf_strfmt everywhere, and update
all the call sites with appropriate error checking.
There is not yet any semantic change, since before this patch all the
places where we introduce elf_strval dereferenced the value anyway, so
it mustn't have been NULL.
In future patches, when elf_strval is made able return NULL, when it
does so it will mark the elf "broken" so that an appropriate
diagnostic can be printed.
This is part of the fix to a security issue, XSA-55.
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Chuck Anderson <chuck.anderson@oracle.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
v7: Change readnotes.c check to use two if statements rather than ||.
v2: Fix coding style, in one "if" statement.
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Use the new PTRVAL macros and elf_access_unsigned in
print_l1_mfn_valid_note.
No functional change unless the input is wrong, or we are reading a
file for a different endianness.
Separated out from the previous patch because this change does produce
a difference in the generated code.
This is part of the fix to a security issue, XSA-55.
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Chuck Anderson <chuck.anderson@oracle.com>
v2: Split out into its own patch.
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We introduce a collection of macros which abstract away all the
pointer arithmetic and dereferences used for accessing the input ELF
and the output area(s). We use the new macros everywhere.
For now, these macros are semantically identical to the code they
replace, so this patch has no functional change.
elf_is_elfbinary is an exception: since it doesn't take an elf*, we
need to handle it differently. In a future patch we will change it to
take, and check, a length parameter. For now we just mark it with a
fixme.
That this patch has no functional change can be verified as follows:
0. Copy the scripts "comparison-generate" and "function-filter"
out of this commit message.
1. Check out the tree before this patch.
2. Run the script ../comparison-generate .... ../before
3. Check out the tree after this patch.
4. Run the script ../comparison-generate .... ../after
5. diff --exclude=\*.[soi] -ruN before/ after/ |less
Expect these differences:
* stubdom/zlib-x86_64/ztest*.s2
The filename of this test file apparently contains the pid.
* xen/common/version.s2
The xen build timestamp appears in two diff hunks.
Verification that this is all that's needed:
In a completely built xen.git,
find * -name .*.d -type f | xargs grep -l libelf\.h
Expect results in:
xen/arch/x86: Checked above.
tools/libxc: Checked above.
tools/xcutils/readnotes: Checked above.
tools/xenstore: Checked above.
xen/common/libelf:
This is the build for the hypervisor; checked in B above.
stubdom:
We have one stubdom which reads ELFs using our libelf,
pvgrub, which is checked above.
I have not done this verification for ARM.
This is part of the fix to a security issue, XSA-55.
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
v7: Add uintptr_t cast to ELF_UNSAFE_PTR. Still verifies.
Use git foo not git-foo in commit message verification script.
v4: Fix elf_load_binary's phdr message to be correct on 32-bit.
Fix ELF_OBSOLETE_VOIDP_CAST to work on 32-bit.
Indent scripts in commit message.
v3.1:
Change elf_store_field to verify correctly on 32-bit.
comparison-generate copes with Xen 4.1's lack of ./configure.
v2: Use Xen style for multi-line comments.
Postpone changes to readnotes.c:print_l1_mfn_valid_note.
Much improved verification instructions with new script.
Fixed commit message subject.
-8<- comparison-generate -8<-
#!/bin/bash
# usage:
# cd xen.git
# .../comparison-generate OUR-CONFIG BUILD-RUNE-PREFIX ../before|../after
# eg:
# .../comparison-generate ~/work/.config 'schroot -pc64 --' ../before
set -ex
test $# = 3 || need-exactly-three-arguments
our_config=$1
build_rune_prefix=$2
result_dir=$3
git clean -x -d -f
cp "$our_config" .
cat <<END >>.config
debug_symbols=n
CFLAGS += -save-temps
END
perl -i~ -pe 's/ -g / -g0 / if m/^CFLAGS/' xen/Rules.mk
if [ -f ./configure ]; then
$build_rune_prefix ./configure
fi
$build_rune_prefix make -C xen
$build_rune_prefix make -C tools/include
$build_rune_prefix make -C stubdom grub
$build_rune_prefix make -C tools/libxc
$build_rune_prefix make -C tools/xenstore
$build_rune_prefix make -C tools/xcutils
rm -rf "$result_dir"
mkdir "$result_dir"
set +x
for f in `find xen tools stubdom -name \*.[soi]`; do
mkdir -p "$result_dir"/`dirname $f`
cp $f "$result_dir"/${f}
case $f in
*.s)
../function-filter <$f >"$result_dir"/${f}2
;;
esac
done
echo ok.
-8<-
-8<- function-filter -8<-
#!/usr/bin/perl -w
# function-filter
# script for massaging gcc-generated labels to be consistent
use strict;
our @lines;
my $sedderybody = "sub seddery () {\n";
while (<>) {
push @lines, $_;
if (m/^(__FUNCTION__|__func__)\.(\d+)\:/) {
$sedderybody .= " s/\\b$1\\.$2\\b/__XSA55MANGLED__$1.$./g;\n";
}
}
$sedderybody .= "}\n1;\n";
eval $sedderybody or die $@;
foreach (@lines) {
seddery();
print or die $!;
}
-8<-
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Add the check of bzImage kernel and make it work
with RHEL 6 big zImage kernel
Signed-off-by: Xuesen Guo <Xuesen.Guo@hitachiconsulting.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
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This patch eliminate the global variables in libxenctrl (used for
logging and error reporting).
Instead the information which was in the global variables is now in a
new xc_interface* opaque structure, which xc_interface open returns
instead of the raw file descriptor; furthermore, logging is done via
xentoollog.
There are three new parameters to xc_interface_open to control the
logging, but existing callers can just pass "0" for all three to get
the old behaviour.
All libxc callers have been adjusted accordingly.
Also update QEMU_TAG for corresponding qemu change.
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
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libelf now permits callers to specify logging callback functions,
rather than a FILE*. libelf's non-Xen callers are all libxc users, so
the stdio dependency and the default logging callback function (which
calls vfprintf) is now in libxc.
Xen's use of libxc is unaffected in this patch.
Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com>
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Signed-off-by: Jan Beulich <jbeulich@novell.com>
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Signed-off-by: Brendan Cully <brendan@cs.ubc.ca>
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Signed-off-by: Ian Campbell <ian.campbell@xensource.com>
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It's always an error to try to use sections on an executable; the
segments in the phdr are definitive.
Unfortunately we cannot drop SHT_NOTE support completely due to a
binutils bug which causes kernels to have the offset field of the
PT_NOTE phdr set to zero:
http://sourceware.org/bugzilla/show_bug.cgi?id=594
This bug is present in binutils 2.17 although some distros have
backported the fix.
Therefore we simply prefer a PT_NOTE segment if we find one otherwise
we still use the SHT_NOTE section (and then the old __xen_guest
section).
Based on a patch from Jeremy Fitzhardinge.
Also added XEN_ELFNOTE_HV_START_LOW to readnotes.
Signed-off-by: Ian Campbell <ian.campbell@xensource.com>
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From: Gerd Hoffmann <kraxel@suse.de>
Signed-off-by: Emmanuel Ackaouy <ack@xensource.com>
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Signed-off-by: Gerd Hoffmann <kraxel@suse.de>
---
tools/xcutils/readnotes.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
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This patch makes the readnotes utility use libelf.
Signed-off-by: Gerd Hoffmann <kraxel@suse.de>
---
tools/xcutils/readnotes.c | 277 +++++++---------------------------------------
1 file changed, 45 insertions(+), 232 deletions(-)
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Signed-off-by: Keir Fraser <keir@xensource.com>
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Signed-off-by: John Levon <john.levon@sun.com>
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We can remove Elf_Ehdr since it is only used for e_ident which is an
unsigned char array.
Signed-off-by: Ian Campbell <ian.campbell@xensource.com>
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Signed-off-by: Ian Campbell <ian.campbell@xensource.com>
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