May 2024 - Kernel - mailweb.openeuler.org

[PATCH OLK-5.10 0/3] backport mainline bugfix
by felix 28 May '24

28 May '24

From: Felix Fu <fuzhen5(a)huawei.com> Eric Snowberg (1): KEYS: Create static version of public_key_verify_signature Georgia Garcia (1): apparmor: fix invalid reference on profile->disconnected Xiu Jianfeng (1): audit: correct audit_filter_inodes() definition include/crypto/public_key.h | 9 +++++++++ kernel/audit.h | 2 +- security/apparmor/policy.c | 1 + security/apparmor/policy_unpack.c | 5 +++-- 4 files changed, 14 insertions(+), 3 deletions(-) -- 2.34.1

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[PATCH OLK-5.10 1/3] apparmor: fix invalid reference on profile->disconnected
by felix 28 May '24

28 May '24

From: Georgia Garcia <georgia.garcia(a)canonical.com> mainline inclusion from mainline-v6.7-rc1 commit 8884ba07786c718771cf7b78cb3024924b27ec2b category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I9SY02 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- profile->disconnected was storing an invalid reference to the disconnected path. Fix it by duplicating the string using aa_unpack_strdup and freeing accordingly. Fixes: 72c8a768641d ("apparmor: allow profiles to provide info to disconnected paths") Signed-off-by: Georgia Garcia <georgia.garcia(a)canonical.com> Signed-off-by: John Johansen <john.johansen(a)canonical.com> Conflicts: security/apparmor/policy_unpack.c security/apparmor/policy.c [Because b11e51dd7 not merged, so change aa_unpack_str_dup to unpack_str_dup, it just has been renamed] Signed-off-by: Felix Fu <fuzhen5(a)huawei.com> --- security/apparmor/policy.c | 1 + security/apparmor/policy_unpack.c | 5 +++-- 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/security/apparmor/policy.c b/security/apparmor/policy.c index fcf22577f606..600aeba802f1 100644 --- a/security/apparmor/policy.c +++ b/security/apparmor/policy.c @@ -218,6 +218,7 @@ void aa_free_profile(struct aa_profile *profile) aa_put_ns(profile->ns); kfree_sensitive(profile->rename); + kfree_sensitive(profile->disconnected); aa_free_file_rules(&profile->file); aa_free_cap_rules(&profile->caps); diff --git a/security/apparmor/policy_unpack.c b/security/apparmor/policy_unpack.c index 6c2a536173b5..0e6e32a6fe67 100644 --- a/security/apparmor/policy_unpack.c +++ b/security/apparmor/policy_unpack.c @@ -678,7 +678,7 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name) const char *info = "failed to unpack profile"; size_t ns_len; struct rhashtable_params params = { 0 }; - char *key = NULL; + char *key = NULL, *disconnected = NULL; struct aa_data *data; int i, error = -EPROTO; kernel_cap_t tmpcap; @@ -736,7 +736,8 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name) } /* disconnected attachment string is optional */ - (void) unpack_str(e, &profile->disconnected, "disconnected"); + (void) unpack_strdup(e, &disconnected, "disconnected"); + profile->disconnected = disconnected; /* per profile debug flags (complain, audit) */ if (!unpack_nameX(e, AA_STRUCT, "flags")) { -- 2.34.1

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[PATCH OLK-6.6] perf pmu: Count sys and cpuid JSON events separately
by Junhao He 28 May '24

28 May '24

From: Ian Rogers <irogers(a)google.com> mainline inclusion from mainline-v6.10-rc1 commit d9c5f5f94c2d356fdf3503f7fcaf254512bc032d category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I9SXXQ CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- Sys events are eagerly loaded as each event has a compat option that may mean the event is or isn't associated with the PMU. These shouldn't be counted as loaded_json_events as that is used for JSON events matching the CPUID that may or may not have been loaded. The mismatch causes issues on ARM64 that uses sys events. Fixes: e6ff1eed3584362d ("perf pmu: Lazily add JSON events") Closes: https://lore.kernel.org/lkml/20240510024729.1075732-1-justin.he@arm.com/ Reported-by: Jia He <justin.he(a)arm.com> Signed-off-by: Ian Rogers <irogers(a)google.com> Cc: Adrian Hunter <adrian.hunter(a)intel.com> Cc: Alexander Shishkin <alexander.shishkin(a)linux.intel.com> Cc: Ingo Molnar <mingo(a)redhat.com> Cc: James Clark <james.clark(a)arm.com> Cc: Jiri Olsa <jolsa(a)kernel.org> Cc: John Garry <john.g.garry(a)oracle.com> Cc: Kan Liang <kan.liang(a)linux.intel.com> Cc: Mark Rutland <mark.rutland(a)arm.com> Cc: Namhyung Kim <namhyung(a)kernel.org> Cc: Peter Zijlstra <peterz(a)infradead.org> Link: https://lore.kernel.org/r/20240511003601.2666907-1-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme(a)redhat.com> Signed-off-by: Junhao He <hejunhao3(a)huawei.com> --- tools/perf/util/pmu.c | 68 ++++++++++++++++++++++++++++++------------- tools/perf/util/pmu.h | 6 ++-- 2 files changed, 52 insertions(+), 22 deletions(-) diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index 86bfdf5db213..caf1067838f0 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -35,6 +35,18 @@ struct perf_pmu perf_pmu__fake = { #define UNIT_MAX_LEN 31 /* max length for event unit name */ +enum event_source { + /* An event loaded from /sys/devices/<pmu>/events. */ + EVENT_SRC_SYSFS, + /* An event loaded from a CPUID matched json file. */ + EVENT_SRC_CPU_JSON, + /* + * An event loaded from a /sys/devices/<pmu>/identifier matched json + * file. + */ + EVENT_SRC_SYS_JSON, +}; + /** * struct perf_pmu_alias - An event either read from sysfs or builtin in * pmu-events.c, created by parsing the pmu-events json files. @@ -499,7 +511,7 @@ static int update_alias(const struct pmu_event *pe, static int perf_pmu__new_alias(struct perf_pmu *pmu, const char *name, const char *desc, const char *val, FILE *val_fd, - const struct pmu_event *pe) + const struct pmu_event *pe, enum event_source src) { struct perf_pmu_alias *alias; int ret; @@ -551,25 +563,30 @@ static int perf_pmu__new_alias(struct perf_pmu *pmu, const char *name, } snprintf(alias->unit, sizeof(alias->unit), "%s", unit); } - if (!pe) { - /* Update an event from sysfs with json data. */ - struct update_alias_data data = { - .pmu = pmu, - .alias = alias, - }; - + switch (src) { + default: + case EVENT_SRC_SYSFS: alias->from_sysfs = true; if (pmu->events_table) { + /* Update an event from sysfs with json data. */ + struct update_alias_data data = { + .pmu = pmu, + .alias = alias, + }; if (pmu_events_table__find_event(pmu->events_table, pmu, name, update_alias, &data) == 0) - pmu->loaded_json_aliases++; + pmu->cpu_json_aliases++; } - } - - if (!pe) pmu->sysfs_aliases++; - else - pmu->loaded_json_aliases++; + break; + case EVENT_SRC_CPU_JSON: + pmu->cpu_json_aliases++; + break; + case EVENT_SRC_SYS_JSON: + pmu->sys_json_aliases++; + break; + + } list_add_tail(&alias->list, &pmu->aliases); return 0; } @@ -645,7 +662,8 @@ static int pmu_aliases_parse(struct perf_pmu *pmu) } if (perf_pmu__new_alias(pmu, name, /*desc=*/ NULL, - /*val=*/ NULL, file, /*pe=*/ NULL) < 0) + /*val=*/ NULL, file, /*pe=*/ NULL, + EVENT_SRC_SYSFS) < 0) pr_debug("Cannot set up %s\n", name); fclose(file); } @@ -880,7 +898,8 @@ static int pmu_add_cpu_aliases_map_callback(const struct pmu_event *pe, { struct perf_pmu *pmu = vdata; - perf_pmu__new_alias(pmu, pe->name, pe->desc, pe->event, /*val_fd=*/ NULL, pe); + perf_pmu__new_alias(pmu, pe->name, pe->desc, pe->event, /*val_fd=*/ NULL, + pe, EVENT_SRC_CPU_JSON); return 0; } @@ -921,7 +940,8 @@ static int pmu_add_sys_aliases_iter_fn(const struct pmu_event *pe, pe->desc, pe->event, /*val_fd=*/ NULL, - pe); + pe, + EVENT_SRC_SYS_JSON); } return 0; @@ -1011,6 +1031,12 @@ struct perf_pmu *perf_pmu__lookup(struct list_head *pmus, int dirfd, const char pmu->id = pmu_id(name); pmu->max_precise = pmu_max_precise(dirfd, pmu); pmu->events_table = perf_pmu__find_events_table(pmu); + /* + * Load the sys json events/aliases when loading the PMU as each event + * may have a different compat regular expression. We therefore can't + * know the number of sys json events/aliases without computing the + * regular expressions for them all. + */ pmu_add_sys_aliases(pmu); list_add_tail(&pmu->list, pmus); @@ -1607,12 +1633,14 @@ size_t perf_pmu__num_events(struct perf_pmu *pmu) if (!pmu->sysfs_aliases_loaded) pmu_aliases_parse(pmu); - nr = pmu->sysfs_aliases; + nr = pmu->sysfs_aliases + pmu->sys_json_aliases;; if (pmu->cpu_aliases_added) - nr += pmu->loaded_json_aliases; + nr += pmu->cpu_json_aliases; else if (pmu->events_table) - nr += pmu_events_table__num_events(pmu->events_table, pmu) - pmu->loaded_json_aliases; + nr += pmu_events_table__num_events(pmu->events_table, pmu) - pmu->cpu_json_aliases; + else + assert(pmu->cpu_json_aliases == 0); return pmu->selectable ? nr + 1 : nr; } diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h index 6a4e170c61d6..1e26294d8580 100644 --- a/tools/perf/util/pmu.h +++ b/tools/perf/util/pmu.h @@ -120,8 +120,10 @@ struct perf_pmu { const struct pmu_events_table *events_table; /** @sysfs_aliases: Number of sysfs aliases loaded. */ uint32_t sysfs_aliases; - /** @sysfs_aliases: Number of json event aliases loaded. */ - uint32_t loaded_json_aliases; + /** @cpu_json_aliases: Number of json event aliases loaded specific to the CPUID. */ + uint32_t cpu_json_aliases; + /** @sys_json_aliases: Number of json event aliases loaded matching the PMU's identifier. */ + uint32_t sys_json_aliases; /** @sysfs_aliases_loaded: Are sysfs aliases loaded from disk? */ bool sysfs_aliases_loaded; /** -- 2.33.0

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[PATCH openEuler-1.0-LTS] drm/nouveau/debugfs: fix file release memory leak
by Zheng Zucheng 28 May '24

28 May '24

From: Yang Yingliang <yangyingliang(a)huawei.com> stable inclusion from stable-v4.19.211 commit 1508b09945bde393326a9dab73b1fc35f672d771 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9R4NL CVE: CVE-2021-47423 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- [ Upstream commit f5a8703a9c418c6fc54eb772712dfe7641e3991c ] When using single_open() for opening, single_release() should be called, otherwise the 'op' allocated in single_open() will be leaked. Fixes: 6e9fc177399f ("drm/nouveau/debugfs: add copy of sysfs pstate interface ported to debugfs") Reported-by: Hulk Robot <hulkci(a)huawei.com> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> Reviewed-by: Karol Herbst <kherbst(a)redhat.com> Signed-off-by: Karol Herbst <kherbst(a)redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210911075023.3969054-2-yang… Signed-off-by: Maarten Lankhorst <maarten.lankhorst(a)linux.intel.com> Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Zheng Zucheng <zhengzucheng(a)huawei.com> --- drivers/gpu/drm/nouveau/nouveau_debugfs.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/nouveau/nouveau_debugfs.c b/drivers/gpu/drm/nouveau/nouveau_debugfs.c index 9635704a1d86..41f9c53302ab 100644 --- a/drivers/gpu/drm/nouveau/nouveau_debugfs.c +++ b/drivers/gpu/drm/nouveau/nouveau_debugfs.c @@ -182,6 +182,7 @@ static const struct file_operations nouveau_pstate_fops = { .open = nouveau_debugfs_pstate_open, .read = seq_read, .write = nouveau_debugfs_pstate_set, + .release = single_release, }; static struct drm_info_list nouveau_debugfs_list[] = { -- 2.34.1

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[PATCH v3 openEuler-1.0-LTS] cpu/hotplug: Don't offline the last non-isolated CPU
by liwei 28 May '24

28 May '24

From: Ran Xiaokai <ran.xiaokai(a)zte.com.cn> mainline inclusion from mainline-v6.7-rc1 commit 38685e2a0476127db766f81b1c06019ddc4c9ffa category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9RFL2 CVE: CVE-2023-52831 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- If a system has isolated CPUs via the "isolcpus=" command line parameter, then an attempt to offline the last housekeeping CPU will result in a WARN_ON() when rebuilding the scheduler domains and a subsequent panic due to and unhandled empty CPU mas in partition_sched_domains_locked(). cpuset_hotplug_workfn() rebuild_sched_domains_locked() ndoms = generate_sched_domains(&doms, &attr); cpumask_and(doms[0], top_cpuset.effective_cpus, housekeeping_cpumask(HK_FLAG_DOMAIN)); Thus results in an empty CPU mask which triggers the warning and then the subsequent crash: WARNING: CPU: 4 PID: 80 at kernel/sched/topology.c:2366 build_sched_domains+0x120c/0x1408 Call trace: build_sched_domains+0x120c/0x1408 partition_sched_domains_locked+0x234/0x880 rebuild_sched_domains_locked+0x37c/0x798 rebuild_sched_domains+0x30/0x58 cpuset_hotplug_workfn+0x2a8/0x930 Unable to handle kernel paging request at virtual address fffe80027ab37080 partition_sched_domains_locked+0x318/0x880 rebuild_sched_domains_locked+0x37c/0x798 Aside of the resulting crash, it does not make any sense to offline the last last housekeeping CPU. Prevent this by masking out the non-housekeeping CPUs when selecting a target CPU for initiating the CPU unplug operation via the work queue. Suggested-by: Thomas Gleixner <tglx(a)linutronix.de> Signed-off-by: Ran Xiaokai <ran.xiaokai(a)zte.com.cn> Signed-off-by: Thomas Gleixner <tglx(a)linutronix.de> Link: https://lore.kernel.org/r/202310171709530660462@zte.com.cn Conflicts: kernel/cpu.c [commit 9ca12ac04bb7d7cfb28aa549dcd3d15761f15543 ("kernel/cpu: Allow non-zero CPU to be primary for suspend / kexec freeze") was nos merged] Signed-off-by: liwei <liwei728(a)huawei.com> --- kernel/cpu.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/kernel/cpu.c b/kernel/cpu.c index d1d61f363a2c..d902c943fede 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -10,6 +10,7 @@ #include <linux/notifier.h> #include <linux/sched/signal.h> #include <linux/sched/hotplug.h> +#include <linux/sched/isolation.h> #include <linux/sched/task.h> #include <linux/sched/smt.h> #include <linux/unistd.h> @@ -1044,11 +1045,14 @@ static int cpu_down_maps_locked(unsigned int cpu, enum cpuhp_state target) /* * Ensure that the control task does not run on the to be offlined * CPU to prevent a deadlock against cfs_b->period_timer. + * Also keep at least one housekeeping cpu onlined to avoid generating + * an empty sched_domain span. */ - cpu = cpumask_any_but(cpu_online_mask, cpu); - if (cpu >= nr_cpu_ids) - return -EBUSY; - return work_on_cpu(cpu, __cpu_down_maps_locked, &work); + for_each_cpu_and(cpu, cpu_online_mask, housekeeping_cpumask(HK_FLAG_DOMAIN)) { + if (cpu != work.cpu) + return work_on_cpu(cpu, __cpu_down_maps_locked, &work); + } + return -EBUSY; } static int do_cpu_down(unsigned int cpu, enum cpuhp_state target) -- 2.25.1

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[PATCH openEuler-1.0-LTS 0/2] Fix CVE-2021-47495
by Yang Yingliang 28 May '24

28 May '24

Oliver Neukum (1): usbnet: sanity check for maxpacket Wang Hai (1): usbnet: fix error return code in usbnet_probe() drivers/net/usb/usbnet.c | 5 +++++ 1 file changed, 5 insertions(+) -- 2.25.1

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[PATCH openEuler-22.03-LTS-SP1] jfs: fix array-index-out-of-bounds in diAlloc
by Li Lingfeng 28 May '24

28 May '24

From: Manas Ghandat <ghandatmanas(a)gmail.com> mainline inclusion from mainline-v6.7-rc1 commit 05d9ea1ceb62a55af6727a69269a4fd310edf483 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9RFMU CVE: CVE-2023-52805 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- Currently there is not check against the agno of the iag while allocating new inodes to avoid fragmentation problem. Added the check which is required. Reported-by: syzbot+79d792676d8ac050949f(a)syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=79d792676d8ac050949f Signed-off-by: Manas Ghandat <ghandatmanas(a)gmail.com> Signed-off-by: Dave Kleikamp <dave.kleikamp(a)oracle.com> Signed-off-by: Li Lingfeng <lilingfeng3(a)huawei.com> --- fs/jfs/jfs_imap.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/fs/jfs/jfs_imap.c b/fs/jfs/jfs_imap.c index eaa16a5571da..dc0c8fadce1f 100644 --- a/fs/jfs/jfs_imap.c +++ b/fs/jfs/jfs_imap.c @@ -1321,7 +1321,7 @@ diInitInode(struct inode *ip, int iagno, int ino, int extno, struct iag * iagp) int diAlloc(struct inode *pip, bool dir, struct inode *ip) { int rc, ino, iagno, addext, extno, bitno, sword; - int nwords, rem, i, agno; + int nwords, rem, i, agno, dn_numag; u32 mask, inosmap, extsmap; struct inode *ipimap; struct metapage *mp; @@ -1357,6 +1357,9 @@ int diAlloc(struct inode *pip, bool dir, struct inode *ip) /* get the ag number of this iag */ agno = BLKTOAG(JFS_IP(pip)->agstart, JFS_SBI(pip->i_sb)); + dn_numag = JFS_SBI(pip->i_sb)->bmap->db_numag; + if (agno < 0 || agno > dn_numag) + return -EIO; if (atomic_read(&JFS_SBI(pip->i_sb)->bmap->db_active[agno])) { /* -- 2.31.1

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[PATCH openEuler-1.0-LTS] usbnet: sanity check for maxpacket
by Yang Yingliang 28 May '24

28 May '24

From: Oliver Neukum <oneukum(a)suse.com> mainline inclusion from mainline-v5.15-rc7 commit 397430b50a363d8b7bdda00522123f82df6adc5e category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9RCX9 CVE: CVE-2021-47495 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- maxpacket of 0 makes no sense and oopses as we need to divide by it. Give up. V2: fixed typo in log and stylistic issues Signed-off-by: Oliver Neukum <oneukum(a)suse.com> Reported-by: syzbot+76bb1d34ffa0adc03baa(a)syzkaller.appspotmail.com Reviewed-by: Johan Hovold <johan(a)kernel.org> Link: https://lore.kernel.org/r/20211021122944.21816-1-oneukum@suse.com Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> --- drivers/net/usb/usbnet.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c index 7686ebca6d86..695582f3a5cb 100644 --- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -1784,6 +1784,10 @@ usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) if (!dev->rx_urb_size) dev->rx_urb_size = dev->hard_mtu; dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); + if (dev->maxpacket == 0) { + /* that is a broken device */ + goto out4; + } /* let userspace know we have a random address */ if (ether_addr_equal(net->dev_addr, node_id)) -- 2.25.1

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[PATCH openEuler-1.0-LTS] drm/nouveau/debugfs: fix file release memory leak
by Zheng Zucheng 28 May '24

28 May '24

From: Yang Yingliang <yangyingliang(a)huawei.com> stable inclusion from stable-4.19.211 commit 1508b09945bde393326a9dab73b1fc35f672d771 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9R4NL CVE: CVE-2021-47423 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- [ Upstream commit f5a8703a9c418c6fc54eb772712dfe7641e3991c ] When using single_open() for opening, single_release() should be called, otherwise the 'op' allocated in single_open() will be leaked. Fixes: 6e9fc177399f ("drm/nouveau/debugfs: add copy of sysfs pstate interface ported to debugfs") Reported-by: Hulk Robot <hulkci(a)huawei.com> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> Reviewed-by: Karol Herbst <kherbst(a)redhat.com> Signed-off-by: Karol Herbst <kherbst(a)redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210911075023.3969054-2-yang… Signed-off-by: Maarten Lankhorst <maarten.lankhorst(a)linux.intel.com> Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Zheng Zucheng <zhengzucheng(a)huawei.com> --- drivers/gpu/drm/nouveau/nouveau_debugfs.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/nouveau/nouveau_debugfs.c b/drivers/gpu/drm/nouveau/nouveau_debugfs.c index 9635704a1d86..41f9c53302ab 100644 --- a/drivers/gpu/drm/nouveau/nouveau_debugfs.c +++ b/drivers/gpu/drm/nouveau/nouveau_debugfs.c @@ -182,6 +182,7 @@ static const struct file_operations nouveau_pstate_fops = { .open = nouveau_debugfs_pstate_open, .read = seq_read, .write = nouveau_debugfs_pstate_set, + .release = single_release, }; static struct drm_info_list nouveau_debugfs_list[] = { -- 2.34.1

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[PATCH v2 openEuler-1.0-LTS] cpu/hotplug: Don't offline the last non-isolated CPU
by liwei 28 May '24

28 May '24

From: Ran Xiaokai <ran.xiaokai(a)zte.com.cn> mainline inclusion from mainline-v6.7-rc1 commit 38685e2a0476127db766f81b1c06019ddc4c9ffa category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9RFL2 CVE: CVE-2023-52831 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- If a system has isolated CPUs via the "isolcpus=" command line parameter, then an attempt to offline the last housekeeping CPU will result in a WARN_ON() when rebuilding the scheduler domains and a subsequent panic due to and unhandled empty CPU mas in partition_sched_domains_locked(). cpuset_hotplug_workfn() rebuild_sched_domains_locked() ndoms = generate_sched_domains(&doms, &attr); cpumask_and(doms[0], top_cpuset.effective_cpus, housekeeping_cpumask(HK_FLAG_DOMAIN)); Thus results in an empty CPU mask which triggers the warning and then the subsequent crash: WARNING: CPU: 4 PID: 80 at kernel/sched/topology.c:2366 build_sched_domains+0x120c/0x1408 Call trace: build_sched_domains+0x120c/0x1408 partition_sched_domains_locked+0x234/0x880 rebuild_sched_domains_locked+0x37c/0x798 rebuild_sched_domains+0x30/0x58 cpuset_hotplug_workfn+0x2a8/0x930 Unable to handle kernel paging request at virtual address fffe80027ab37080 partition_sched_domains_locked+0x318/0x880 rebuild_sched_domains_locked+0x37c/0x798 Aside of the resulting crash, it does not make any sense to offline the last last housekeeping CPU. Prevent this by masking out the non-housekeeping CPUs when selecting a target CPU for initiating the CPU unplug operation via the work queue. Suggested-by: Thomas Gleixner <tglx(a)linutronix.de> Signed-off-by: Ran Xiaokai <ran.xiaokai(a)zte.com.cn> Signed-off-by: Thomas Gleixner <tglx(a)linutronix.de> Link: https://lore.kernel.org/r/202310171709530660462@zte.com.cn Conflicts: kernel/cpu.c [commit 9ca12ac04bb7d7cfb28aa549dcd3d15761f15543 ("kernel/cpu: Allow non-zero CPU to be primary for suspend / kexec freeze") was nos merged] Signed-off-by: liwei <liwei728(a)huawei.com> --- kernel/cpu.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/kernel/cpu.c b/kernel/cpu.c index d1d61f363a2c..d631dccfb549 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -1044,11 +1044,14 @@ static int cpu_down_maps_locked(unsigned int cpu, enum cpuhp_state target) /* * Ensure that the control task does not run on the to be offlined * CPU to prevent a deadlock against cfs_b->period_timer. + * Also keep at least one housekeeping cpu onlined to avoid generating + * an empty sched_domain span. */ - cpu = cpumask_any_but(cpu_online_mask, cpu); - if (cpu >= nr_cpu_ids) - return -EBUSY; - return work_on_cpu(cpu, __cpu_down_maps_locked, &work); + for_each_cpu_and(cpu, cpu_online_mask, housekeeping_cpumask(HK_TYPE_DOMAIN)) { + if (cpu != work.cpu) + return work_on_cpu(cpu, __cpu_down_maps_locked, &work); + } + return -EBUSY; } static int do_cpu_down(unsigned int cpu, enum cpuhp_state target) -- 2.25.1

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