From 407a281a8e2b6c5078ba1148535663ea64fd9314 Mon Sep 17 00:00:00 2001 From: "Daniel P. Berrange" Date: Wed, 12 Jul 2017 11:07:17 +0100 Subject: [PATCH] Revert "Prevent more compiler optimization of mockable functions" This reverts commit e4b980c853d2114b25fa805a84ea288384416221. When a binary links against a .a archive (as opposed to a shared library), any symbols which are marked as 'weak' get silently dropped. As a result when the binary later runs, those 'weak' functions have an address of 0x0 and thus crash when run. This happened with virtlogd and virtlockd because they don't link to libvirt.so, but instead just libvirt_util.a and libvirt_rpc.a. The virRandomBits symbols was weak and so left out of the virtlogd & virtlockd binaries, despite being required by virHashTable functions. Various other binaries like libvirt_lxc, libvirt_iohelper, etc also link directly to .a files instead of libvirt.so, so are potentially at risk of dropping symbols leading to a later runtime crash. This is normal linker behaviour because a weak symbol is not treated as undefined, so nothing forces it to be pulled in from the .a You have to force the linker to pull in weak symbols using -u$SYMNAME which is not a practical approach. This risk is silent bad linkage that affects runtime behaviour is not acceptable for a fix that was merely trying to fix the test suite. So stop using __weak__ again. Signed-off-by: Daniel P. Berrange --- build-aux/mock-noinline.pl | 2 +- src/check-symfile.pl | 2 +- src/internal.h | 23 +++++------------------ src/qemu/qemu_capspriv.h | 2 +- src/rpc/virnetsocket.h | 4 ++-- src/util/vircommand.h | 2 +- src/util/vircrypto.h | 2 +- src/util/virfile.h | 2 +- src/util/virhostcpu.h | 4 ++-- src/util/virmacaddr.h | 2 +- src/util/virnetdev.h | 8 ++++---- src/util/virnetdevip.h | 2 +- src/util/virnetdevopenvswitch.h | 2 +- src/util/virnetdevtap.h | 6 +++--- src/util/virnuma.h | 16 ++++++++-------- src/util/virrandom.h | 6 +++--- src/util/virscsi.h | 2 +- src/util/virscsivhost.h | 2 +- src/util/virtpm.h | 2 +- src/util/virutil.h | 10 +++++----- src/util/viruuid.h | 2 +- 21 files changed, 45 insertions(+), 58 deletions(-) diff --git a/build-aux/mock-noinline.pl b/build-aux/mock-noinline.pl index 2745d4baf7..eafe20d2e2 100644 --- a/build-aux/mock-noinline.pl +++ b/build-aux/mock-noinline.pl @@ -43,7 +43,7 @@ sub scan_annotations { } elsif (/^\s*$/) { $func = undef; } - if (/ATTRIBUTE_MOCKABLE/) { + if (/ATTRIBUTE_NOINLINE/) { if (defined $func) { $noninlined{$func} = 1; } diff --git a/src/check-symfile.pl b/src/check-symfile.pl index 3b062d0a48..d59a213eba 100755 --- a/src/check-symfile.pl +++ b/src/check-symfile.pl @@ -52,7 +52,7 @@ foreach my $elflib (@elflibs) { open NM, "-|", "nm", $elflib or die "cannot run 'nm $elflib': $!"; while () { - next unless /^\S+\s(?:[TBDW])\s(\S+)\s*$/; + next unless /^\S+\s(?:[TBD])\s(\S+)\s*$/; $gotsyms{$1} = 1; } diff --git a/src/internal.h b/src/internal.h index 00edd4fdeb..c29f20f022 100644 --- a/src/internal.h +++ b/src/internal.h @@ -113,26 +113,13 @@ # endif /** - * ATTRIBUTE_MOCKABLE: - * - * Ensure that the symbol can be overridden in a mock - * library preload. This implies a number of attributes - * - * - noinline: prevents the body being inlined to - * callers, - * - noclone: prevents specialized copies of the - * function body being created for different - * callers - * - weak: prevents the compiler making optimizations - * such as constant return value propagation + * ATTRIBUTE_NOINLINE: * + * Force compiler not to inline a method. Should be used if + * the method need to be overridable by test mocks. */ -# ifndef ATTRIBUTE_MOCKABLE -# if __GNUC_PREREQ(4, 5) -# define ATTRIBUTE_MOCKABLE __attribute__((__noinline__, __noclone__, __weak__)) -# else -# define ATTRIBUTE_MOCKABLE __attribute__((__noinline__, __weak__)) -# endif +# ifndef ATTRIBUTE_NOINLINE +# define ATTRIBUTE_NOINLINE __attribute__((__noinline__)) # endif /** diff --git a/src/qemu/qemu_capspriv.h b/src/qemu/qemu_capspriv.h index 6cc189e403..94fa75b960 100644 --- a/src/qemu/qemu_capspriv.h +++ b/src/qemu/qemu_capspriv.h @@ -95,7 +95,7 @@ virQEMUCapsSetCPUModelInfo(virQEMUCapsPtr qemuCaps, virCPUDefPtr virQEMUCapsProbeHostCPUForEmulator(virCapsPtr caps, virQEMUCapsPtr qemuCaps, - virDomainVirtType type) ATTRIBUTE_MOCKABLE; + virDomainVirtType type) ATTRIBUTE_NOINLINE; void virQEMUCapsSetGICCapabilities(virQEMUCapsPtr qemuCaps, diff --git a/src/rpc/virnetsocket.h b/src/rpc/virnetsocket.h index 3c2945e4b1..de795af917 100644 --- a/src/rpc/virnetsocket.h +++ b/src/rpc/virnetsocket.h @@ -137,10 +137,10 @@ int virNetSocketGetUNIXIdentity(virNetSocketPtr sock, gid_t *gid, pid_t *pid, unsigned long long *timestamp) - ATTRIBUTE_MOCKABLE; + ATTRIBUTE_NOINLINE; int virNetSocketGetSELinuxContext(virNetSocketPtr sock, char **context) - ATTRIBUTE_MOCKABLE; + ATTRIBUTE_NOINLINE; int virNetSocketSetBlocking(virNetSocketPtr sock, bool blocking); diff --git a/src/util/vircommand.h b/src/util/vircommand.h index c042a532a4..e7c2e513ba 100644 --- a/src/util/vircommand.h +++ b/src/util/vircommand.h @@ -58,7 +58,7 @@ enum { void virCommandPassFD(virCommandPtr cmd, int fd, - unsigned int flags) ATTRIBUTE_MOCKABLE; + unsigned int flags) ATTRIBUTE_NOINLINE; void virCommandPassListenFDs(virCommandPtr cmd); diff --git a/src/util/vircrypto.h b/src/util/vircrypto.h index 50400c6a18..068602f5df 100644 --- a/src/util/vircrypto.h +++ b/src/util/vircrypto.h @@ -55,6 +55,6 @@ int virCryptoEncryptData(virCryptoCipher algorithm, ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(6) ATTRIBUTE_NONNULL(8) ATTRIBUTE_NONNULL(9) ATTRIBUTE_RETURN_CHECK; -uint8_t *virCryptoGenerateRandom(size_t nbytes) ATTRIBUTE_MOCKABLE; +uint8_t *virCryptoGenerateRandom(size_t nbytes) ATTRIBUTE_NOINLINE; #endif /* __VIR_CRYPTO_H__ */ diff --git a/src/util/virfile.h b/src/util/virfile.h index 32c9115f57..57ceb80721 100644 --- a/src/util/virfile.h +++ b/src/util/virfile.h @@ -188,7 +188,7 @@ void virFileActivateDirOverride(const char *argv0) off_t virFileLength(const char *path, int fd) ATTRIBUTE_NONNULL(1); bool virFileIsDir (const char *file) ATTRIBUTE_NONNULL(1); -bool virFileExists(const char *file) ATTRIBUTE_NONNULL(1) ATTRIBUTE_MOCKABLE; +bool virFileExists(const char *file) ATTRIBUTE_NONNULL(1) ATTRIBUTE_NOINLINE; bool virFileIsExecutable(const char *file) ATTRIBUTE_NONNULL(1); enum { diff --git a/src/util/virhostcpu.h b/src/util/virhostcpu.h index 3b30a0d16c..67033de842 100644 --- a/src/util/virhostcpu.h +++ b/src/util/virhostcpu.h @@ -38,7 +38,7 @@ bool virHostCPUHasBitmap(void); virBitmapPtr virHostCPUGetPresentBitmap(void); virBitmapPtr virHostCPUGetOnlineBitmap(void); int virHostCPUGetCount(void); -int virHostCPUGetThreadsPerSubcore(virArch arch) ATTRIBUTE_MOCKABLE; +int virHostCPUGetThreadsPerSubcore(virArch arch) ATTRIBUTE_NOINLINE; int virHostCPUGetMap(unsigned char **cpumap, unsigned int *online, @@ -51,7 +51,7 @@ int virHostCPUGetInfo(virArch hostarch, unsigned int *cores, unsigned int *threads); -int virHostCPUGetKVMMaxVCPUs(void) ATTRIBUTE_MOCKABLE; +int virHostCPUGetKVMMaxVCPUs(void) ATTRIBUTE_NOINLINE; int virHostCPUStatsAssign(virNodeCPUStatsPtr param, const char *name, diff --git a/src/util/virmacaddr.h b/src/util/virmacaddr.h index 79492cdf3f..f4f5e2ce11 100644 --- a/src/util/virmacaddr.h +++ b/src/util/virmacaddr.h @@ -48,7 +48,7 @@ void virMacAddrGetRaw(const virMacAddr *src, unsigned char dst[VIR_MAC_BUFLEN]); const char *virMacAddrFormat(const virMacAddr *addr, char *str); void virMacAddrGenerate(const unsigned char prefix[VIR_MAC_PREFIX_BUFLEN], - virMacAddrPtr addr) ATTRIBUTE_MOCKABLE; + virMacAddrPtr addr) ATTRIBUTE_NOINLINE; int virMacAddrParse(const char* str, virMacAddrPtr addr) ATTRIBUTE_RETURN_CHECK; int virMacAddrParseHex(const char* str, diff --git a/src/util/virnetdev.h b/src/util/virnetdev.h index 2e9a9c4057..51fcae544e 100644 --- a/src/util/virnetdev.h +++ b/src/util/virnetdev.h @@ -156,7 +156,7 @@ int virNetDevExists(const char *brname) int virNetDevSetOnline(const char *ifname, bool online) - ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK ATTRIBUTE_MOCKABLE; + ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK ATTRIBUTE_NOINLINE; int virNetDevGetOnline(const char *ifname, bool *online) ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK; @@ -164,7 +164,7 @@ int virNetDevGetOnline(const char *ifname, int virNetDevSetMAC(const char *ifname, const virMacAddr *macaddr) - ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK ATTRIBUTE_MOCKABLE; + ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK ATTRIBUTE_NOINLINE; int virNetDevGetMAC(const char *ifname, virMacAddrPtr macaddr) ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK; @@ -303,8 +303,8 @@ int virNetDevSysfsFile(char **pf_sysfs_device_link, const char *ifname, const char *file) ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3) - ATTRIBUTE_RETURN_CHECK ATTRIBUTE_MOCKABLE; + ATTRIBUTE_RETURN_CHECK ATTRIBUTE_NOINLINE; int virNetDevRunEthernetScript(const char *ifname, const char *script) - ATTRIBUTE_MOCKABLE; + ATTRIBUTE_NOINLINE; #endif /* __VIR_NETDEV_H__ */ diff --git a/src/util/virnetdevip.h b/src/util/virnetdevip.h index 972a49ae8f..6b509ea445 100644 --- a/src/util/virnetdevip.h +++ b/src/util/virnetdevip.h @@ -67,7 +67,7 @@ int virNetDevIPAddrAdd(const char *ifname, virSocketAddr *addr, virSocketAddr *peer, unsigned int prefix) - ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK ATTRIBUTE_MOCKABLE; + ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK ATTRIBUTE_NOINLINE; int virNetDevIPRouteAdd(const char *ifname, virSocketAddrPtr addr, unsigned int prefix, diff --git a/src/util/virnetdevopenvswitch.h b/src/util/virnetdevopenvswitch.h index dc677ca024..51bb1dd006 100644 --- a/src/util/virnetdevopenvswitch.h +++ b/src/util/virnetdevopenvswitch.h @@ -59,6 +59,6 @@ int virNetDevOpenvswitchInterfaceStats(const char *ifname, int virNetDevOpenvswitchGetVhostuserIfname(const char *path, char **ifname) - ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK ATTRIBUTE_MOCKABLE; + ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK ATTRIBUTE_NOINLINE; #endif /* __VIR_NETDEV_OPENVSWITCH_H__ */ diff --git a/src/util/virnetdevtap.h b/src/util/virnetdevtap.h index 1c4343ef80..0b17feb8d9 100644 --- a/src/util/virnetdevtap.h +++ b/src/util/virnetdevtap.h @@ -39,7 +39,7 @@ int virNetDevTapCreate(char **ifname, int *tapfd, size_t tapfdSize, unsigned int flags) - ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK ATTRIBUTE_MOCKABLE; + ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK ATTRIBUTE_NOINLINE; int virNetDevTapDelete(const char *ifname, const char *tunpath) @@ -49,7 +49,7 @@ int virNetDevTapGetName(int tapfd, char **ifname) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK; char* virNetDevTapGetRealDeviceName(char *ifname) - ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK ATTRIBUTE_MOCKABLE; + ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK ATTRIBUTE_NOINLINE; typedef enum { VIR_NETDEV_TAP_CREATE_NONE = 0, @@ -89,7 +89,7 @@ int virNetDevTapCreateInBridgePort(const char *brname, unsigned int *actualMTU, unsigned int flags) ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3) - ATTRIBUTE_RETURN_CHECK ATTRIBUTE_MOCKABLE; + ATTRIBUTE_RETURN_CHECK ATTRIBUTE_NOINLINE; int virNetDevTapInterfaceStats(const char *ifname, virDomainInterfaceStatsPtr stats) diff --git a/src/util/virnuma.h b/src/util/virnuma.h index 62b89e9cb7..e4e1fd0b97 100644 --- a/src/util/virnuma.h +++ b/src/util/virnuma.h @@ -34,20 +34,20 @@ int virNumaSetupMemoryPolicy(virDomainNumatuneMemMode mode, virBitmapPtr nodeset); virBitmapPtr virNumaGetHostMemoryNodeset(void); -bool virNumaNodesetIsAvailable(virBitmapPtr nodeset) ATTRIBUTE_MOCKABLE; -bool virNumaIsAvailable(void) ATTRIBUTE_MOCKABLE; -int virNumaGetMaxNode(void) ATTRIBUTE_MOCKABLE; -bool virNumaNodeIsAvailable(int node) ATTRIBUTE_MOCKABLE; +bool virNumaNodesetIsAvailable(virBitmapPtr nodeset) ATTRIBUTE_NOINLINE; +bool virNumaIsAvailable(void) ATTRIBUTE_NOINLINE; +int virNumaGetMaxNode(void) ATTRIBUTE_NOINLINE; +bool virNumaNodeIsAvailable(int node) ATTRIBUTE_NOINLINE; int virNumaGetDistances(int node, int **distances, - int *ndistances) ATTRIBUTE_MOCKABLE; + int *ndistances) ATTRIBUTE_NOINLINE; int virNumaGetNodeMemory(int node, unsigned long long *memsize, - unsigned long long *memfree) ATTRIBUTE_MOCKABLE; + unsigned long long *memfree) ATTRIBUTE_NOINLINE; unsigned int virNumaGetMaxCPUs(void); -int virNumaGetNodeCPUs(int node, virBitmapPtr *cpus) ATTRIBUTE_MOCKABLE; +int virNumaGetNodeCPUs(int node, virBitmapPtr *cpus) ATTRIBUTE_NOINLINE; int virNumaGetPageInfo(int node, unsigned int page_size, @@ -59,7 +59,7 @@ int virNumaGetPages(int node, unsigned int **pages_avail, unsigned int **pages_free, size_t *npages) - ATTRIBUTE_NONNULL(5) ATTRIBUTE_MOCKABLE; + ATTRIBUTE_NONNULL(5) ATTRIBUTE_NOINLINE; int virNumaSetPagePoolSize(int node, unsigned int page_size, unsigned long long page_count, diff --git a/src/util/virrandom.h b/src/util/virrandom.h index 990a456add..7a984ee7b0 100644 --- a/src/util/virrandom.h +++ b/src/util/virrandom.h @@ -24,11 +24,11 @@ # include "internal.h" -uint64_t virRandomBits(int nbits) ATTRIBUTE_MOCKABLE; +uint64_t virRandomBits(int nbits) ATTRIBUTE_NOINLINE; double virRandom(void); uint32_t virRandomInt(uint32_t max); int virRandomBytes(unsigned char *buf, size_t buflen) - ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK ATTRIBUTE_MOCKABLE; -int virRandomGenerateWWN(char **wwn, const char *virt_type) ATTRIBUTE_MOCKABLE; + ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK ATTRIBUTE_NOINLINE; +int virRandomGenerateWWN(char **wwn, const char *virt_type) ATTRIBUTE_NOINLINE; #endif /* __VIR_RANDOM_H__ */ diff --git a/src/util/virscsi.h b/src/util/virscsi.h index eed563d6c7..9f8b3ecf1e 100644 --- a/src/util/virscsi.h +++ b/src/util/virscsi.h @@ -37,7 +37,7 @@ char *virSCSIDeviceGetSgName(const char *sysfs_prefix, const char *adapter, unsigned int bus, unsigned int target, - unsigned long long unit) ATTRIBUTE_MOCKABLE; + unsigned long long unit) ATTRIBUTE_NOINLINE; char *virSCSIDeviceGetDevName(const char *sysfs_prefix, const char *adapter, unsigned int bus, diff --git a/src/util/virscsivhost.h b/src/util/virscsivhost.h index f9272a659f..21887ddbd5 100644 --- a/src/util/virscsivhost.h +++ b/src/util/virscsivhost.h @@ -61,6 +61,6 @@ void virSCSIVHostDeviceGetUsedBy(virSCSIVHostDevicePtr dev, const char **drv_name, const char **dom_name); void virSCSIVHostDeviceFree(virSCSIVHostDevicePtr dev); -int virSCSIVHostOpenVhostSCSI(int *vhostfd) ATTRIBUTE_MOCKABLE; +int virSCSIVHostOpenVhostSCSI(int *vhostfd) ATTRIBUTE_NOINLINE; #endif /* __VIR_SCSIHOST_H__ */ diff --git a/src/util/virtpm.h b/src/util/virtpm.h index 7067bb53de..b21fc0532f 100644 --- a/src/util/virtpm.h +++ b/src/util/virtpm.h @@ -22,6 +22,6 @@ #ifndef __VIR_TPM_H__ # define __VIR_TPM_H__ -char *virTPMCreateCancelPath(const char *devpath) ATTRIBUTE_MOCKABLE; +char *virTPMCreateCancelPath(const char *devpath) ATTRIBUTE_NOINLINE; #endif /* __VIR_TPM_H__ */ diff --git a/src/util/virutil.h b/src/util/virutil.h index 35e5ca3ab6..49382557f6 100644 --- a/src/util/virutil.h +++ b/src/util/virutil.h @@ -139,8 +139,8 @@ char *virGetUserConfigDirectory(void); char *virGetUserCacheDirectory(void); char *virGetUserRuntimeDirectory(void); char *virGetUserShell(uid_t uid); -char *virGetUserName(uid_t uid) ATTRIBUTE_MOCKABLE; -char *virGetGroupName(gid_t gid) ATTRIBUTE_MOCKABLE; +char *virGetUserName(uid_t uid) ATTRIBUTE_NOINLINE; +char *virGetGroupName(gid_t gid) ATTRIBUTE_NOINLINE; int virGetGroupList(uid_t uid, gid_t group, gid_t **groups) ATTRIBUTE_NONNULL(3); int virGetUserID(const char *name, @@ -201,12 +201,12 @@ verify((int)VIR_TRISTATE_BOOL_ABSENT == (int)VIR_TRISTATE_SWITCH_ABSENT); unsigned int virGetListenFDs(void); -long virGetSystemPageSize(void) ATTRIBUTE_MOCKABLE; -long virGetSystemPageSizeKB(void) ATTRIBUTE_MOCKABLE; +long virGetSystemPageSize(void) ATTRIBUTE_NOINLINE; +long virGetSystemPageSizeKB(void) ATTRIBUTE_NOINLINE; unsigned long long virMemoryLimitTruncate(unsigned long long value); bool virMemoryLimitIsSet(unsigned long long value); -unsigned long long virMemoryMaxValue(bool ulong) ATTRIBUTE_MOCKABLE; +unsigned long long virMemoryMaxValue(bool ulong) ATTRIBUTE_NOINLINE; /** * VIR_ASSIGN_IS_OVERFLOW: diff --git a/src/util/viruuid.h b/src/util/viruuid.h index 3b41b42050..1d67e9ee57 100644 --- a/src/util/viruuid.h +++ b/src/util/viruuid.h @@ -49,7 +49,7 @@ int virGetHostUUID(unsigned char *host_uuid) ATTRIBUTE_NONNULL(1); int virUUIDIsValid(unsigned char *uuid); -int virUUIDGenerate(unsigned char *uuid) ATTRIBUTE_MOCKABLE; +int virUUIDGenerate(unsigned char *uuid) ATTRIBUTE_NOINLINE; int virUUIDParse(const char *uuidstr, unsigned char *uuid) -- GitLab