NetlinkEvent: use isKernel64Bit in KernelUtils.h
Now that the code has moved, delete the local implementation in favor of
the common one.
Test: builds
Change-Id: Ic29d7c9bcd3d623204f3e4de3a3434483021cbac
diff --git a/libsysutils/Android.bp b/libsysutils/Android.bp
index 5f472b2..1b41a6b 100644
--- a/libsysutils/Android.bp
+++ b/libsysutils/Android.bp
@@ -29,6 +29,10 @@
"liblog",
],
+ header_libs: [
+ "bpf_headers",
+ ],
+
export_include_dirs: ["include"],
tidy: true,
diff --git a/libsysutils/src/NetlinkEvent.cpp b/libsysutils/src/NetlinkEvent.cpp
index 515cc10..cd9db54 100644
--- a/libsysutils/src/NetlinkEvent.cpp
+++ b/libsysutils/src/NetlinkEvent.cpp
@@ -37,10 +37,12 @@
#include <sys/utsname.h>
#include <android-base/parseint.h>
+#include <bpf/KernelUtils.h>
#include <log/log.h>
#include <sysutils/NetlinkEvent.h>
using android::base::ParseInt;
+using android::bpf::isKernel64Bit;
/* From kernel's net/netfilter/xt_quota2.c */
const int LOCAL_QLOG_NL_EVENT = 112;
@@ -138,60 +140,6 @@
static_assert(sizeof(ulog_packet_msg32_t) == 168);
static_assert(sizeof(ulog_packet_msg64_t) == 192);
-// Figure out the bitness of userspace.
-// Trivial and known at compile time.
-static bool isUserspace64bit(void) {
- return sizeof(long) == 8;
-}
-
-// Figure out the bitness of the kernel.
-static bool isKernel64Bit(void) {
- // a 64-bit userspace requires a 64-bit kernel
- if (isUserspace64bit()) return true;
-
- static bool init = false;
- static bool cache = false;
- if (init) return cache;
-
- // Retrieve current personality - on Linux this system call *cannot* fail.
- int p = personality(0xffffffff);
- // But if it does just assume kernel and userspace (which is 32-bit) match...
- if (p == -1) return false;
-
- // This will effectively mask out the bottom 8 bits, and switch to 'native'
- // personality, and then return the previous personality of this thread
- // (likely PER_LINUX or PER_LINUX32) with any extra options unmodified.
- int q = personality((p & ~PER_MASK) | PER_LINUX);
- // Per man page this theoretically could error out with EINVAL,
- // but kernel code analysis suggests setting PER_LINUX cannot fail.
- // Either way, assume kernel and userspace (which is 32-bit) match...
- if (q != p) return false;
-
- struct utsname u;
- (void)uname(&u); // only possible failure is EFAULT, but u is on stack.
-
- // Switch back to previous personality.
- // Theoretically could fail with EINVAL on arm64 with no 32-bit support,
- // but then we wouldn't have fetched 'p' from the kernel in the first place.
- // Either way there's nothing meaningul we can do in case of error.
- // Since PER_LINUX32 vs PER_LINUX only affects uname.machine it doesn't
- // really hurt us either. We're really just switching back to be 'clean'.
- (void)personality(p);
-
- // Possible values of utsname.machine observed on x86_64 desktop (arm via qemu):
- // x86_64 i686 aarch64 armv7l
- // additionally observed on arm device:
- // armv8l
- // presumably also might just be possible:
- // i386 i486 i586
- // and there might be other weird arm32 cases.
- // We note that the 64 is present in both 64-bit archs,
- // and in general is likely to be present in only 64-bit archs.
- cache = !!strstr(u.machine, "64");
- init = true;
- return cache;
-}
-
/******************************************************************************/
NetlinkEvent::NetlinkEvent() {