File 0001-Binariescheck-Check-for-chroot-chdir-on-AR... of Package rpmlint-tests

Overview Repositories Revisions Requests Users Attributes Meta

File 0001-Binariescheck-Check-for-chroot-chdir-on-ARM-PPC.patch of Package rpmlint-tests

From 5237c197f56698d55fd1d18f8127f6e947350d80 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stefan=20Br=C3=BCns?= <stefan.bruens@rwth-aachen.de>
Date: Wed, 11 Oct 2017 16:29:21 +0200
Subject: [PATCH] Binariescheck: Check for chroot/chdir on ARM, PPC

The assembly on ARM looks almost the same as the x86 assembly, but
with a branch mnemonic (bl) instead of an explicit call.

On PPC, library function calls use jump tables, so the vicinity check does
not work, but we can at least detect a sole chroot without chdir.
---
 BinariesCheck.py | 28 +++++++++++++++++++---------
 1 file changed, 19 insertions(+), 9 deletions(-)

diff --git a/BinariesCheck.py b/BinariesCheck.py
index bd75558..8d224a8 100644
--- a/BinariesCheck.py
+++ b/BinariesCheck.py
@@ -54,8 +54,6 @@ class BinaryInfo(object):
     setuid_call_regex = create_regexp_call(r'set(?:res|e)?uid')
     setgroups_call_regex = create_regexp_call(r'(?:ini|se)tgroups')
     chroot_call_regex = create_regexp_call('chroot')
-    # 401eb8:   e8 c3 f0 ff ff          callq  400f80 <chdir@plt>
-    objdump_call_regex = re.compile(br'callq?\s(.*)')
     debuginfo_regex = re.compile(r'^\s+\[\s*\d+\]\s+\.debug_.*\s+')
     symtab_regex = re.compile(r'^\s+\[\s*\d+\]\s+\.symtab\s+')
     gethostbyname_call_regex = create_regexp_call(r'(gethostbyname|gethostbyname2|gethostbyaddr|gethostbyname_r|gethostbyname2_r|gethostbyaddr_r)')
@@ -96,6 +94,16 @@ class BinaryInfo(object):
         self.mktemp = False
 
         is_debug = path.endswith('.debug')
+        # Currently this implementation works only on specific
+        # architectures due to reliance on arch specific assembly.
+        if pkg.arch in ['armv6hl', 'armv7hl', 'aarch64']:
+            # 10450:   ebffffec        bl      10408 <chroot@plt>
+            BinaryInfo.objdump_call_regex = re.compile(br'\sbl\s+(.*)')
+        elif (pkg.arch.endswith('86') or pkg.arch == 'x86_64'):
+            # 401eb8:   e8 c3 f0 ff ff          callq  400f80 <chdir@plt>
+            BinaryInfo.objdump_call_regex = re.compile(br'callq?\s(.*)')
+        else:
+            BinaryInfo.objdump_call_regex = None
 
         res = Pkg.getstatusoutput(
             ('readelf', '-W', '-S', '-l', '-d', '-s', path))
@@ -204,10 +212,13 @@ class BinaryInfo(object):
 
             # check if chroot is near chdir (since otherwise, chroot is called
             # without chdir)
-            # Currently this implementation works only on x86_64 due to reliance
-            # on x86_64 specific assembly. Skip it on other architectures
-            if ((pkg.arch.endswith('86') or pkg.arch == 'x86_64') and
-                    self.chroot and self.chdir):
+            if not BinaryInfo.objdump_call_regex and self.chroot and self.chdir:
+                # On some architectures, e.g. PPC, it is to difficult to
+                # find the actual invocations of chroot/chdir, if both
+                # exist assume chroot is fine
+                self.chroot_near_chdir = True
+
+            elif self.chroot and self.chdir:
                 p = subprocess.Popen(('objdump', '-d', path),
                                      stdout=subprocess.PIPE, bufsize=-1,
                                      env=dict(os.environ, LC_ALL="C"))
@@ -537,9 +548,8 @@ class BinariesCheck(AbstractCheck.AbstractCheck):
                 printError(pkg, 'missing-call-to-setgroups-before-setuid',
                            fname)
 
-            if ((pkg.arch.endswith('86') or pkg.arch == 'x86_64') and bin_info.chroot):
-                if not bin_info.chdir or not bin_info.chroot_near_chdir:
-                    printError(pkg, 'missing-call-to-chdir-with-chroot', fname)
+            if bin_info.chroot and not bin_info.chroot_near_chdir:
+                printError(pkg, 'missing-call-to-chdir-with-chroot', fname)
 
             if bin_info.mktemp:
                 printError(pkg, 'call-to-mktemp', fname)
-- 
2.14.2

Places

File 0001-Binariescheck-Check-for-chroot-chdir-on-ARM-PPC.patch of Package rpmlint-tests

Places