* [PATCH] libebl: Handle aarch64 bti, pac bits in gnu property note
@ 2020-09-03 9:56 Mark Wielaard
2020-09-03 15:28 ` Mark Wielaard
0 siblings, 1 reply; 3+ messages in thread
From: Mark Wielaard @ 2020-09-03 9:56 UTC (permalink / raw)
To: elfutils-devel; +Cc: Mark Wielaard
When building with gcc -mbranch-protection= we might get a gnu property
note indicating BTI (Branch Target Identification) and/or PAC (Pointer
Authentication Code) is being used.
Add a small testcase to show eu-readelf -n now properly lists those
bits in the gnu property note.
Signed-off-by: Mark Wielaard <mark@klomp.org>
---
libebl/ChangeLog | 5 ++
libebl/eblobjnote.c | 67 +++++++++++++++++++
tests/ChangeLog | 5 ++
tests/run-readelf-n.sh | 31 +++++++++
tests/testfile-gnu-property-note-aarch64.bz2 | Bin 0 -> 1952 bytes
5 files changed, 108 insertions(+)
create mode 100755 tests/testfile-gnu-property-note-aarch64.bz2
diff --git a/libebl/ChangeLog b/libebl/ChangeLog
index e54aa2c9..aa43b31f 100644
--- a/libebl/ChangeLog
+++ b/libebl/ChangeLog
@@ -1,3 +1,8 @@
+2020-09-03 Mark Wielaard <mark@klomp.org>
+
+ * eblobjnote.c (ebl_object_note): For EM_AARCH64 handle BTI and PAC
+ in GNU_PROPERTY_AARCH64_FEATURE_1_AND.
+
2020-07-19 Mark Wielaard <mark@klomp.org>
* libebl.h: Only typedef Ebl if _LIBASM_H is undefined.
diff --git a/libebl/eblobjnote.c b/libebl/eblobjnote.c
index f7ac915c..37cbc499 100644
--- a/libebl/eblobjnote.c
+++ b/libebl/eblobjnote.c
@@ -476,6 +476,73 @@ ebl_object_note (Ebl *ebl, uint32_t namesz, const char *name, uint32_t type,
}
}
}
+ else if (prop.pr_type >= GNU_PROPERTY_LOPROC
+ && prop.pr_type <= GNU_PROPERTY_HIPROC
+ && ehdr.e_machine == EM_AARCH64)
+ {
+ printf ("AARCH64 ");
+ if (prop.pr_type == GNU_PROPERTY_AARCH64_FEATURE_1_AND)
+ {
+ printf ("FEATURE_1_AND: ");
+
+ if (prop.pr_datasz == 4)
+ {
+ GElf_Word data;
+ in.d_type = ELF_T_WORD;
+ out.d_type = ELF_T_WORD;
+ in.d_size = 4;
+ out.d_size = 4;
+ in.d_buf = (void *) desc;
+ out.d_buf = (void *) &data;
+
+ if (gelf_xlatetom (ebl->elf, &out, &in,
+ elfident[EI_DATA]) == NULL)
+ {
+ printf ("%s\n", elf_errmsg (-1));
+ return;
+ }
+ printf ("%08" PRIx32 " ", data);
+
+ if ((data & GNU_PROPERTY_AARCH64_FEATURE_1_BTI)
+ != 0)
+ {
+ printf ("BTI");
+ data &= ~GNU_PROPERTY_AARCH64_FEATURE_1_BTI;
+ if (data != 0)
+ printf (" ");
+ }
+
+ if ((data & GNU_PROPERTY_AARCH64_FEATURE_1_PAC)
+ != 0)
+ {
+ printf ("PAC");
+ data &= ~GNU_PROPERTY_AARCH64_FEATURE_1_PAC;
+ if (data != 0)
+ printf (" ");
+ }
+
+ if (data != 0)
+ printf ("UNKNOWN");
+ }
+ else
+ printf ("<bad datasz: %" PRId32 ">",
+ prop.pr_datasz);
+
+ printf ("\n");
+ }
+ else
+ {
+ printf ("%#" PRIx32, prop.pr_type);
+ if (prop.pr_datasz > 0)
+ {
+ printf (" data: ");
+ size_t i;
+ for (i = 0; i < prop.pr_datasz - 1; i++)
+ printf ("%02" PRIx8 " ", (uint8_t) desc[i]);
+ printf ("%02" PRIx8 "\n", (uint8_t) desc[i]);
+ }
+ }
+ }
else
{
if (prop.pr_type >= GNU_PROPERTY_LOPROC
diff --git a/tests/ChangeLog b/tests/ChangeLog
index 047100b0..cb2e9956 100644
--- a/tests/ChangeLog
+++ b/tests/ChangeLog
@@ -1,3 +1,8 @@
+2020-09-03 Mark Wielaard <mark@klomp.org>
+
+ * testfile-gnu-property-note-aarch64.bz2: New file.
+ * run-readelf-n.sh: Handle testfile-gnu-property-note-aarch64.
+
2020-07-19 Mark Wielaard <mark@klomp.org>
* asm-tst1.c: Include libebl.h after libasm.h.
diff --git a/tests/run-readelf-n.sh b/tests/run-readelf-n.sh
index cc7d7f66..4c98fd82 100755
--- a/tests/run-readelf-n.sh
+++ b/tests/run-readelf-n.sh
@@ -226,3 +226,34 @@ Note section [ 4] '.note.gnu.property' of 56 bytes at offset 0x40:
GNU 8 GNU_PROPERTY_TYPE_0
NO_COPY_ON_PROTECTION
EOF
+
+# - testfile-gnu-property-note.c
+# int
+# main ()
+# {
+# return 0;
+# }
+#
+# gcc -mbranch-protection=standard -c testfile-gnu-property-note.c
+# gcc -o testfile-gnu-property-note-aarch64 testfile-gnu-property-note.o
+# eu-strip --remove-section=.gnu.build.attributes \
+# testfile-gnu-property-note-aarch64
+
+testfiles testfile-gnu-property-note-aarch64
+testrun_compare ${abs_top_builddir}/src/readelf -n testfile-gnu-property-note-aarch64 << EOF
+
+Note section [ 2] '.note.gnu.property' of 32 bytes at offset 0x2c8:
+ Owner Data size Type
+ GNU 16 GNU_PROPERTY_TYPE_0
+ AARCH64 FEATURE_1_AND: 00000003 BTI PAC
+
+Note section [ 3] '.note.gnu.build-id' of 36 bytes at offset 0x2e8:
+ Owner Data size Type
+ GNU 20 GNU_BUILD_ID
+ Build ID: af82d6df6f3b396487e3e27a826ca9cbbbecbe5f
+
+Note section [ 4] '.note.ABI-tag' of 32 bytes at offset 0x30c:
+ Owner Data size Type
+ GNU 16 GNU_ABI_TAG
+ OS: Linux, ABI: 3.7.0
+EOF
diff --git a/tests/testfile-gnu-property-note-aarch64.bz2 b/tests/testfile-gnu-property-note-aarch64.bz2
new file mode 100755
index 0000000000000000000000000000000000000000..2fe37b1957065c4ebeb5ffae4c933fe7da1310b6
GIT binary patch
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--
2.18.4
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] libebl: Handle aarch64 bti, pac bits in gnu property note
2020-09-03 9:56 [PATCH] libebl: Handle aarch64 bti, pac bits in gnu property note Mark Wielaard
@ 2020-09-03 15:28 ` Mark Wielaard
2020-09-07 10:54 ` Mark Wielaard
0 siblings, 1 reply; 3+ messages in thread
From: Mark Wielaard @ 2020-09-03 15:28 UTC (permalink / raw)
To: elfutils-devel
On Thu, 2020-09-03 at 11:56 +0200, Mark Wielaard wrote:
> When building with gcc -mbranch-protection= we might get a gnu property
> note indicating BTI (Branch Target Identification) and/or PAC (Pointer
> Authentication Code) is being used.
>
> Add a small testcase to show eu-readelf -n now properly lists those
> bits in the gnu property note.
Oops. Forgot to add the new testfile to EXTRA_DIST.
diff --git a/tests/ChangeLog b/tests/ChangeLog
index cb2e9956..61c6cb7c 100644
--- a/tests/ChangeLog
+++ b/tests/ChangeLog
@@ -2,6 +2,8 @@
* testfile-gnu-property-note-aarch64.bz2: New file.
* run-readelf-n.sh: Handle testfile-gnu-property-note-aarch64.
+ * Makefile.am (EXTRA_DIST): Add
+ testfile-gnu-property-note-aarch64.bz2.
2020-07-19 Mark Wielaard <mark@klomp.org>
diff --git a/tests/Makefile.am b/tests/Makefile.am
index d30b8218..939bbb6a 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -319,6 +319,7 @@ EXTRA_DIST = run-arextract.sh run-arsymtest.sh run-ar.sh \
testfile_gnu_props.64le.o.bz2 \
testfile_gnu_props.32be.o.bz2 \
testfile_gnu_props.64be.o.bz2 \
+ testfile-gnu-property-note-aarch64.bz2 \
run-allfcts-multi.sh \
test-offset-loop.bz2 test-offset-loop.alt.bz2 \
run-prelink-addr-test.sh \
>
> Signed-off-by: Mark Wielaard <mark@klomp.org>
> ---
> libebl/ChangeLog | 5 ++
> libebl/eblobjnote.c | 67 +++++++++++++++++++
> tests/ChangeLog | 5 ++
> tests/run-readelf-n.sh | 31 +++++++++
> tests/testfile-gnu-property-note-aarch64.bz2 | Bin 0 -> 1952 bytes
> 5 files changed, 108 insertions(+)
> create mode 100755 tests/testfile-gnu-property-note-aarch64.bz2
>
> diff --git a/libebl/ChangeLog b/libebl/ChangeLog
> index e54aa2c9..aa43b31f 100644
> --- a/libebl/ChangeLog
> +++ b/libebl/ChangeLog
> @@ -1,3 +1,8 @@
> +2020-09-03 Mark Wielaard <mark@klomp.org>
> +
> + * eblobjnote.c (ebl_object_note): For EM_AARCH64 handle BTI and PAC
> + in GNU_PROPERTY_AARCH64_FEATURE_1_AND.
> +
> 2020-07-19 Mark Wielaard <mark@klomp.org>
>
> * libebl.h: Only typedef Ebl if _LIBASM_H is undefined.
> diff --git a/libebl/eblobjnote.c b/libebl/eblobjnote.c
> index f7ac915c..37cbc499 100644
> --- a/libebl/eblobjnote.c
> +++ b/libebl/eblobjnote.c
> @@ -476,6 +476,73 @@ ebl_object_note (Ebl *ebl, uint32_t namesz, const char *name, uint32_t type,
> }
> }
> }
> + else if (prop.pr_type >= GNU_PROPERTY_LOPROC
> + && prop.pr_type <= GNU_PROPERTY_HIPROC
> + && ehdr.e_machine == EM_AARCH64)
> + {
> + printf ("AARCH64 ");
> + if (prop.pr_type == GNU_PROPERTY_AARCH64_FEATURE_1_AND)
> + {
> + printf ("FEATURE_1_AND: ");
> +
> + if (prop.pr_datasz == 4)
> + {
> + GElf_Word data;
> + in.d_type = ELF_T_WORD;
> + out.d_type = ELF_T_WORD;
> + in.d_size = 4;
> + out.d_size = 4;
> + in.d_buf = (void *) desc;
> + out.d_buf = (void *) &data;
> +
> + if (gelf_xlatetom (ebl->elf, &out, &in,
> + elfident[EI_DATA]) == NULL)
> + {
> + printf ("%s\n", elf_errmsg (-1));
> + return;
> + }
> + printf ("%08" PRIx32 " ", data);
> +
> + if ((data & GNU_PROPERTY_AARCH64_FEATURE_1_BTI)
> + != 0)
> + {
> + printf ("BTI");
> + data &= ~GNU_PROPERTY_AARCH64_FEATURE_1_BTI;
> + if (data != 0)
> + printf (" ");
> + }
> +
> + if ((data & GNU_PROPERTY_AARCH64_FEATURE_1_PAC)
> + != 0)
> + {
> + printf ("PAC");
> + data &= ~GNU_PROPERTY_AARCH64_FEATURE_1_PAC;
> + if (data != 0)
> + printf (" ");
> + }
> +
> + if (data != 0)
> + printf ("UNKNOWN");
> + }
> + else
> + printf ("<bad datasz: %" PRId32 ">",
> + prop.pr_datasz);
> +
> + printf ("\n");
> + }
> + else
> + {
> + printf ("%#" PRIx32, prop.pr_type);
> + if (prop.pr_datasz > 0)
> + {
> + printf (" data: ");
> + size_t i;
> + for (i = 0; i < prop.pr_datasz - 1; i++)
> + printf ("%02" PRIx8 " ", (uint8_t) desc[i]);
> + printf ("%02" PRIx8 "\n", (uint8_t) desc[i]);
> + }
> + }
> + }
> else
> {
> if (prop.pr_type >= GNU_PROPERTY_LOPROC
> diff --git a/tests/ChangeLog b/tests/ChangeLog
> index 047100b0..cb2e9956 100644
> --- a/tests/ChangeLog
> +++ b/tests/ChangeLog
> @@ -1,3 +1,8 @@
> +2020-09-03 Mark Wielaard <mark@klomp.org>
> +
> + * testfile-gnu-property-note-aarch64.bz2: New file.
> + * run-readelf-n.sh: Handle testfile-gnu-property-note-aarch64.
> +
> 2020-07-19 Mark Wielaard <mark@klomp.org>
>
> * asm-tst1.c: Include libebl.h after libasm.h.
> diff --git a/tests/run-readelf-n.sh b/tests/run-readelf-n.sh
> index cc7d7f66..4c98fd82 100755
> --- a/tests/run-readelf-n.sh
> +++ b/tests/run-readelf-n.sh
> @@ -226,3 +226,34 @@ Note section [ 4] '.note.gnu.property' of 56 bytes at offset 0x40:
> GNU 8 GNU_PROPERTY_TYPE_0
> NO_COPY_ON_PROTECTION
> EOF
> +
> +# - testfile-gnu-property-note.c
> +# int
> +# main ()
> +# {
> +# return 0;
> +# }
> +#
> +# gcc -mbranch-protection=standard -c testfile-gnu-property-note.c
> +# gcc -o testfile-gnu-property-note-aarch64 testfile-gnu-property-note.o
> +# eu-strip --remove-section=.gnu.build.attributes \
> +# testfile-gnu-property-note-aarch64
> +
> +testfiles testfile-gnu-property-note-aarch64
> +testrun_compare ${abs_top_builddir}/src/readelf -n testfile-gnu-property-note-aarch64 << EOF
> +
> +Note section [ 2] '.note.gnu.property' of 32 bytes at offset 0x2c8:
> + Owner Data size Type
> + GNU 16 GNU_PROPERTY_TYPE_0
> + AARCH64 FEATURE_1_AND: 00000003 BTI PAC
> +
> +Note section [ 3] '.note.gnu.build-id' of 36 bytes at offset 0x2e8:
> + Owner Data size Type
> + GNU 20 GNU_BUILD_ID
> + Build ID: af82d6df6f3b396487e3e27a826ca9cbbbecbe5f
> +
> +Note section [ 4] '.note.ABI-tag' of 32 bytes at offset 0x30c:
> + Owner Data size Type
> + GNU 16 GNU_ABI_TAG
> + OS: Linux, ABI: 3.7.0
> +EOF
> diff --git a/tests/testfile-gnu-property-note-aarch64.bz2 b/tests/testfile-gnu-property-note-aarch64.bz2
> new file mode 100755
> index 0000000000000000000000000000000000000000..2fe37b1957065c4ebeb5ffae4c933fe7da1310b6
> GIT binary patch
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> literal 0
> HcmV?d00001
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] libebl: Handle aarch64 bti, pac bits in gnu property note
2020-09-03 15:28 ` Mark Wielaard
@ 2020-09-07 10:54 ` Mark Wielaard
0 siblings, 0 replies; 3+ messages in thread
From: Mark Wielaard @ 2020-09-07 10:54 UTC (permalink / raw)
To: elfutils-devel
On Thu, 2020-09-03 at 17:28 +0200, Mark Wielaard wrote:
> On Thu, 2020-09-03 at 11:56 +0200, Mark Wielaard wrote:
> > When building with gcc -mbranch-protection= we might get a gnu property
> > note indicating BTI (Branch Target Identification) and/or PAC (Pointer
> > Authentication Code) is being used.
> >
> > Add a small testcase to show eu-readelf -n now properly lists those
> > bits in the gnu property note.
>
> Oops. Forgot to add the new testfile to EXTRA_DIST.
>
> diff --git a/tests/ChangeLog b/tests/ChangeLog
> index cb2e9956..61c6cb7c 100644
> --- a/tests/ChangeLog
> +++ b/tests/ChangeLog
> @@ -2,6 +2,8 @@
>
> * testfile-gnu-property-note-aarch64.bz2: New file.
> * run-readelf-n.sh: Handle testfile-gnu-property-note-aarch64.
> + * Makefile.am (EXTRA_DIST): Add
> + testfile-gnu-property-note-aarch64.bz2.
Pushed with this addition.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2020-09-07 10:54 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2020-09-07 10:54 ` Mark Wielaard
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