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[PATCH OLK-6.6] tty: n_gsm: fix possible out-of-bounds in gsm0_receive()
by Cui GaoSheng 16 Jul '24

16 Jul '24

From: Daniel Starke <daniel.starke(a)siemens.com> stable inclusion from stable-v6.6.33 commit 774d83b008eccb1c48c14dc5486e7aa255731350 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9TAHR CVE: CVE-2024-36016 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- commit 47388e807f85948eefc403a8a5fdc5b406a65d5a upstream. Assuming the following: - side A configures the n_gsm in basic option mode - side B sends the header of a basic option mode frame with data length 1 - side A switches to advanced option mode - side B sends 2 data bytes which exceeds gsm->len Reason: gsm->len is not used in advanced option mode. - side A switches to basic option mode - side B keeps sending until gsm0_receive() writes past gsm->buf Reason: Neither gsm->state nor gsm->len have been reset after reconfiguration. Fix this by changing gsm->count to gsm->len comparison from equal to less than. Also add upper limit checks against the constant MAX_MRU in gsm0_receive() and gsm1_receive() to harden against memory corruption of gsm->len and gsm->mru. All other checks remain as we still need to limit the data according to the user configuration and actual payload size. Reported-by: j51569436(a)gmail.com Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218708 Tested-by: j51569436(a)gmail.com Fixes: e1eaea46bb40 ("tty: n_gsm line discipline") Cc: stable(a)vger.kernel.org Signed-off-by: Daniel Starke <daniel.starke(a)siemens.com> Link: https://lore.kernel.org/r/20240424054842.7741-1-daniel.starke@siemens.com Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Signed-off-by: Cui GaoSheng <cuigaosheng1(a)huawei.com> --- drivers/tty/n_gsm.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index 0ee7531c9201..f8858865c5bb 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -2912,7 +2912,10 @@ static void gsm0_receive(struct gsm_mux *gsm, unsigned char c) break; case GSM_DATA: /* Data */ gsm->buf[gsm->count++] = c; - if (gsm->count == gsm->len) { + if (gsm->count >= MAX_MRU) { + gsm->bad_size++; + gsm->state = GSM_SEARCH; + } else if (gsm->count >= gsm->len) { /* Calculate final FCS for UI frames over all data */ if ((gsm->control & ~PF) != UIH) { gsm->fcs = gsm_fcs_add_block(gsm->fcs, gsm->buf, @@ -3025,7 +3028,7 @@ static void gsm1_receive(struct gsm_mux *gsm, unsigned char c) gsm->state = GSM_DATA; break; case GSM_DATA: /* Data */ - if (gsm->count > gsm->mru) { /* Allow one for the FCS */ + if (gsm->count > gsm->mru || gsm->count > MAX_MRU) { /* Allow one for the FCS */ gsm->state = GSM_OVERRUN; gsm->bad_size++; } else -- 2.34.1

2 1

[PATCH openEuler-22.03-LTS-SP1 0/5] Fix CVE-2024-36939
by Wang Zhaolong 16 Jul '24

16 Jul '24

Josef Bacik (3): sunrpc: add a struct rpc_stats arg to rpc_create_args nfs: expose /proc/net/sunrpc/nfs in net namespaces nfs: make the rpc_stat per net namespace Kuniyuki Iwashima (1): nfs: Handle error of rpc_proc_register() in nfs_net_init(). Wang Zhaolong (1): sunrpc: fix KABI broken in struct rpc_create_args fs/nfs/client.c | 5 ++++- fs/nfs/inode.c | 13 +++++++++---- fs/nfs/internal.h | 2 -- fs/nfs/netns.h | 2 ++ include/linux/sunrpc/clnt.h | 2 +- net/sunrpc/clnt.c | 5 ++++- 6 files changed, 20 insertions(+), 9 deletions(-) -- 2.34.3

2 6

[PATCH OLK-5.10 0/5] Fix CVE-2024-36939
by Wang Zhaolong 16 Jul '24

16 Jul '24

Josef Bacik (3): sunrpc: add a struct rpc_stats arg to rpc_create_args nfs: expose /proc/net/sunrpc/nfs in net namespaces nfs: make the rpc_stat per net namespace Kuniyuki Iwashima (1): nfs: Handle error of rpc_proc_register() in nfs_net_init(). Wang Zhaolong (1): sunrpc: fix KABI broken in struct rpc_create_args fs/nfs/client.c | 5 ++++- fs/nfs/inode.c | 13 +++++++++---- fs/nfs/internal.h | 2 -- fs/nfs/netns.h | 2 ++ include/linux/sunrpc/clnt.h | 2 +- net/sunrpc/clnt.c | 5 ++++- 6 files changed, 20 insertions(+), 9 deletions(-) -- 2.34.3

2 6

[PATCH OLK-6.6] ALSA: hda/cs_dsp_ctl: Use private_free for control cleanup
by Cui GaoSheng 16 Jul '24

16 Jul '24

From: Richard Fitzgerald <rf(a)opensource.cirrus.com> stable inclusion from stable-v6.6.33 commit 6e359be4975006ff72818e79dad8fe48293f2eb2 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IA7D1H CVE: CVE-2024-38388 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- [ Upstream commit 172811e3a557d8681a5e2d0f871dc04a2d17eb13 ] Use the control private_free callback to free the associated data block. This ensures that the memory won't leak, whatever way the control gets destroyed. The original implementation didn't actually remove the ALSA controls in hda_cs_dsp_control_remove(). It only freed the internal tracking structure. This meant it was possible to remove/unload the amp driver while leaving its ALSA controls still present in the soundcard. Obviously attempting to access them could cause segfaults or at least dereferencing stale pointers. Signed-off-by: Richard Fitzgerald <rf(a)opensource.cirrus.com> Fixes: 3233b978af23 ("ALSA: hda: hda_cs_dsp_ctl: Add Library to support CS_DSP ALSA controls") Link: https://lore.kernel.org/r/20240508095627.44476-1-rf@opensource.cirrus.com Signed-off-by: Takashi Iwai <tiwai(a)suse.de> Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Cui GaoSheng <cuigaosheng1(a)huawei.com> --- sound/pci/hda/hda_cs_dsp_ctl.c | 47 ++++++++++++++++++++++------------ 1 file changed, 31 insertions(+), 16 deletions(-) diff --git a/sound/pci/hda/hda_cs_dsp_ctl.c b/sound/pci/hda/hda_cs_dsp_ctl.c index 463ca06036bf..9db45d7c17e5 100644 --- a/sound/pci/hda/hda_cs_dsp_ctl.c +++ b/sound/pci/hda/hda_cs_dsp_ctl.c @@ -8,6 +8,7 @@ #include <linux/module.h> #include <sound/soc.h> +#include <linux/cleanup.h> #include <linux/firmware/cirrus/cs_dsp.h> #include <linux/firmware/cirrus/wmfw.h> #include "hda_cs_dsp_ctl.h" @@ -97,11 +98,23 @@ static unsigned int wmfw_convert_flags(unsigned int in) return out; } -static void hda_cs_dsp_add_kcontrol(struct hda_cs_dsp_coeff_ctl *ctl, const char *name) +static void hda_cs_dsp_free_kcontrol(struct snd_kcontrol *kctl) { + struct hda_cs_dsp_coeff_ctl *ctl = (struct hda_cs_dsp_coeff_ctl *)snd_kcontrol_chip(kctl); struct cs_dsp_coeff_ctl *cs_ctl = ctl->cs_ctl; + + /* NULL priv to prevent a double-free in hda_cs_dsp_control_remove() */ + cs_ctl->priv = NULL; + kfree(ctl); +} + +static void hda_cs_dsp_add_kcontrol(struct cs_dsp_coeff_ctl *cs_ctl, + const struct hda_cs_dsp_ctl_info *info, + const char *name) +{ struct snd_kcontrol_new kcontrol = {0}; struct snd_kcontrol *kctl; + struct hda_cs_dsp_coeff_ctl *ctl __free(kfree) = NULL; int ret = 0; if (cs_ctl->len > ADSP_MAX_STD_CTRL_SIZE) { @@ -110,6 +123,13 @@ static void hda_cs_dsp_add_kcontrol(struct hda_cs_dsp_coeff_ctl *ctl, const char return; } + ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); + if (!ctl) + return; + + ctl->cs_ctl = cs_ctl; + ctl->card = info->card; + kcontrol.name = name; kcontrol.info = hda_cs_dsp_coeff_info; kcontrol.iface = SNDRV_CTL_ELEM_IFACE_MIXER; @@ -117,20 +137,22 @@ static void hda_cs_dsp_add_kcontrol(struct hda_cs_dsp_coeff_ctl *ctl, const char kcontrol.get = hda_cs_dsp_coeff_get; kcontrol.put = hda_cs_dsp_coeff_put; - /* Save ctl inside private_data, ctl is owned by cs_dsp, - * and will be freed when cs_dsp removes the control */ kctl = snd_ctl_new1(&kcontrol, (void *)ctl); if (!kctl) return; - ret = snd_ctl_add(ctl->card, kctl); + kctl->private_free = hda_cs_dsp_free_kcontrol; + ctl->kctl = kctl; + + /* snd_ctl_add() calls our private_free on error, which will kfree(ctl) */ + cs_ctl->priv = no_free_ptr(ctl); + ret = snd_ctl_add(info->card, kctl); if (ret) { dev_err(cs_ctl->dsp->dev, "Failed to add KControl %s = %d\n", kcontrol.name, ret); return; } dev_dbg(cs_ctl->dsp->dev, "Added KControl: %s\n", kcontrol.name); - ctl->kctl = kctl; } static void hda_cs_dsp_control_add(struct cs_dsp_coeff_ctl *cs_ctl, @@ -138,7 +160,6 @@ static void hda_cs_dsp_control_add(struct cs_dsp_coeff_ctl *cs_ctl, { struct cs_dsp *cs_dsp = cs_ctl->dsp; char name[SNDRV_CTL_ELEM_ID_NAME_MAXLEN]; - struct hda_cs_dsp_coeff_ctl *ctl; const char *region_name; int ret; @@ -163,15 +184,7 @@ static void hda_cs_dsp_control_add(struct cs_dsp_coeff_ctl *cs_ctl, " %.*s", cs_ctl->subname_len - skip, cs_ctl->subname + skip); } - ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); - if (!ctl) - return; - - ctl->cs_ctl = cs_ctl; - ctl->card = info->card; - cs_ctl->priv = ctl; - - hda_cs_dsp_add_kcontrol(ctl, name); + hda_cs_dsp_add_kcontrol(cs_ctl, info, name); } void hda_cs_dsp_add_controls(struct cs_dsp *dsp, const struct hda_cs_dsp_ctl_info *info) @@ -203,7 +216,9 @@ void hda_cs_dsp_control_remove(struct cs_dsp_coeff_ctl *cs_ctl) { struct hda_cs_dsp_coeff_ctl *ctl = cs_ctl->priv; - kfree(ctl); + /* ctl and kctl may already have been removed by ALSA private_free */ + if (ctl && ctl->kctl) + snd_ctl_remove(ctl->card, ctl->kctl); } EXPORT_SYMBOL_NS_GPL(hda_cs_dsp_control_remove, SND_HDA_CS_DSP_CONTROLS); -- 2.34.1

2 1

[PATCH OLK-6.6] openrisc: traps: Don't send signals to kernel mode threads
by Cui GaoSheng 16 Jul '24

16 Jul '24

From: Stafford Horne <shorne(a)gmail.com> stable inclusion from stable-v6.6.33 commit c0ed9a711e3392d73e857faa031d8d349c0d70db category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IA6SH4 CVE: CVE-2024-38614 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- [ Upstream commit c88cfb5cea5f8f9868ef02cc9ce9183a26dcf20f ] OpenRISC exception handling sends signals to user processes on floating point exceptions and trap instructions (for debugging) among others. There is a bug where the trap handling logic may send signals to kernel threads, we should not send these signals to kernel threads, if that happens we treat it as an error. This patch adds conditions to die if the kernel receives these exceptions in kernel mode code. Fixes: 27267655c531 ("openrisc: Support floating point user api") Signed-off-by: Stafford Horne <shorne(a)gmail.com> Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Cui GaoSheng <cuigaosheng1(a)huawei.com> --- arch/openrisc/kernel/traps.c | 48 ++++++++++++++++++++++-------------- 1 file changed, 29 insertions(+), 19 deletions(-) diff --git a/arch/openrisc/kernel/traps.c b/arch/openrisc/kernel/traps.c index 9370888c9a7e..90554a5558fb 100644 --- a/arch/openrisc/kernel/traps.c +++ b/arch/openrisc/kernel/traps.c @@ -180,29 +180,39 @@ asmlinkage void unhandled_exception(struct pt_regs *regs, int ea, int vector) asmlinkage void do_fpe_trap(struct pt_regs *regs, unsigned long address) { - int code = FPE_FLTUNK; - unsigned long fpcsr = regs->fpcsr; - - if (fpcsr & SPR_FPCSR_IVF) - code = FPE_FLTINV; - else if (fpcsr & SPR_FPCSR_OVF) - code = FPE_FLTOVF; - else if (fpcsr & SPR_FPCSR_UNF) - code = FPE_FLTUND; - else if (fpcsr & SPR_FPCSR_DZF) - code = FPE_FLTDIV; - else if (fpcsr & SPR_FPCSR_IXF) - code = FPE_FLTRES; - - /* Clear all flags */ - regs->fpcsr &= ~SPR_FPCSR_ALLF; - - force_sig_fault(SIGFPE, code, (void __user *)regs->pc); + if (user_mode(regs)) { + int code = FPE_FLTUNK; + unsigned long fpcsr = regs->fpcsr; + + if (fpcsr & SPR_FPCSR_IVF) + code = FPE_FLTINV; + else if (fpcsr & SPR_FPCSR_OVF) + code = FPE_FLTOVF; + else if (fpcsr & SPR_FPCSR_UNF) + code = FPE_FLTUND; + else if (fpcsr & SPR_FPCSR_DZF) + code = FPE_FLTDIV; + else if (fpcsr & SPR_FPCSR_IXF) + code = FPE_FLTRES; + + /* Clear all flags */ + regs->fpcsr &= ~SPR_FPCSR_ALLF; + + force_sig_fault(SIGFPE, code, (void __user *)regs->pc); + } else { + pr_emerg("KERNEL: Illegal fpe exception 0x%.8lx\n", regs->pc); + die("Die:", regs, SIGFPE); + } } asmlinkage void do_trap(struct pt_regs *regs, unsigned long address) { - force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->pc); + if (user_mode(regs)) { + force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->pc); + } else { + pr_emerg("KERNEL: Illegal trap exception 0x%.8lx\n", regs->pc); + die("Die:", regs, SIGILL); + } } asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address) -- 2.34.1

2 1

[PATCH openEuler-1.0-LTS] netpoll: Fix race condition in netpoll_owner_active
by Zhengchao Shao 16 Jul '24

16 Jul '24

From: Breno Leitao <leitao(a)debian.org> mainline inclusion from mainline-v6.10-rc1 commit c2e6a872bde9912f1a7579639c5ca3adf1003916 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IACR1O CVE: CVE-2024-41005 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- KCSAN detected a race condition in netpoll: BUG: KCSAN: data-race in net_rx_action / netpoll_send_skb write (marked) to 0xffff8881164168b0 of 4 bytes by interrupt on cpu 10: net_rx_action (./include/linux/netpoll.h:90 net/core/dev.c:6712 net/core/dev.c:6822) <snip> read to 0xffff8881164168b0 of 4 bytes by task 1 on cpu 2: netpoll_send_skb (net/core/netpoll.c:319 net/core/netpoll.c:345 net/core/netpoll.c:393) netpoll_send_udp (net/core/netpoll.c:?) <snip> value changed: 0x0000000a -> 0xffffffff This happens because netpoll_owner_active() needs to check if the current CPU is the owner of the lock, touching napi->poll_owner non atomically. The ->poll_owner field contains the current CPU holding the lock. Use an atomic read to check if the poll owner is the current CPU. Signed-off-by: Breno Leitao <leitao(a)debian.org> Link: https://lore.kernel.org/r/20240429100437.3487432-1-leitao@debian.org Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> Conflicts: net/core/netpoll.c [The conflict occurs because the commit 5251ef829932("net: make sure napi_list is safe for RCU traversal") is not merged] Signed-off-by: Zhengchao Shao <shaozhengchao(a)huawei.com> --- net/core/netpoll.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/core/netpoll.c b/net/core/netpoll.c index b23c32ed6773..f1a830550e0c 100644 --- a/net/core/netpoll.c +++ b/net/core/netpoll.c @@ -315,7 +315,7 @@ static int netpoll_owner_active(struct net_device *dev) struct napi_struct *napi; list_for_each_entry(napi, &dev->napi_list, dev_list) { - if (napi->poll_owner == smp_processor_id()) + if (READ_ONCE(napi->poll_owner) == smp_processor_id()) return 1; } return 0; -- 2.34.1

2 1

[PATCH openEuler-22.03-LTS-SP1] Bluetooth: btusb: Add date->evt_skb is NULL check
by Yuan Can 16 Jul '24

16 Jul '24

From: youwan Wang <wangyouwan(a)126.com> mainline inclusion from mainline-v6.7-rc1 commit 624820f7c8826dd010e8b1963303c145f99816e9 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9RFI9 CVE: CVE-2023-52833 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- [ Upstream commit 624820f7c8826dd010e8b1963303c145f99816e9 ] fix crash because of null pointers [ 6104.969662] BUG: kernel NULL pointer dereference, address: 00000000000000c8 [ 6104.969667] #PF: supervisor read access in kernel mode [ 6104.969668] #PF: error_code(0x0000) - not-present page [ 6104.969670] PGD 0 P4D 0 [ 6104.969673] Oops: 0000 [#1] SMP NOPTI [ 6104.969684] RIP: 0010:btusb_mtk_hci_wmt_sync+0x144/0x220 [btusb] [ 6104.969688] RSP: 0018:ffffb8d681533d48 EFLAGS: 00010246 [ 6104.969689] RAX: 0000000000000000 RBX: ffff8ad560bb2000 RCX: 0000000000000006 [ 6104.969691] RDX: 0000000000000000 RSI: ffffb8d681533d08 RDI: 0000000000000000 [ 6104.969692] RBP: ffffb8d681533d70 R08: 0000000000000001 R09: 0000000000000001 [ 6104.969694] R10: 0000000000000001 R11: 00000000fa83b2da R12: ffff8ad461d1d7c0 [ 6104.969695] R13: 0000000000000000 R14: ffff8ad459618c18 R15: ffffb8d681533d90 [ 6104.969697] FS: 00007f5a1cab9d40(0000) GS:ffff8ad578200000(0000) knlGS:00000 [ 6104.969699] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 6104.969700] CR2: 00000000000000c8 CR3: 000000018620c001 CR4: 0000000000760ef0 [ 6104.969701] PKRU: 55555554 [ 6104.969702] Call Trace: [ 6104.969708] btusb_mtk_shutdown+0x44/0x80 [btusb] [ 6104.969732] hci_dev_do_close+0x470/0x5c0 [bluetooth] [ 6104.969748] hci_rfkill_set_block+0x56/0xa0 [bluetooth] [ 6104.969753] rfkill_set_block+0x92/0x160 [ 6104.969755] rfkill_fop_write+0x136/0x1e0 [ 6104.969759] __vfs_write+0x18/0x40 [ 6104.969761] vfs_write+0xdf/0x1c0 [ 6104.969763] ksys_write+0xb1/0xe0 [ 6104.969765] __x64_sys_write+0x1a/0x20 [ 6104.969769] do_syscall_64+0x51/0x180 [ 6104.969771] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 6104.969773] RIP: 0033:0x7f5a21f18fef [ 6104.9] RSP: 002b:00007ffeefe39010 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 [ 6104.969780] RAX: ffffffffffffffda RBX: 000055c10a7560a0 RCX: 00007f5a21f18fef [ 6104.969781] RDX: 0000000000000008 RSI: 00007ffeefe39060 RDI: 0000000000000012 [ 6104.969782] RBP: 00007ffeefe39060 R08: 0000000000000000 R09: 0000000000000017 [ 6104.969784] R10: 00007ffeefe38d97 R11: 0000000000000293 R12: 0000000000000002 [ 6104.969785] R13: 00007ffeefe39220 R14: 00007ffeefe391a0 R15: 000055c10a72acf0 Signed-off-by: youwan Wang <wangyouwan(a)126.com> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz(a)intel.com> Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Yuan Can <yuancan(a)huawei.com> --- drivers/bluetooth/btusb.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index 6efd981979bd..7e6c96b1dea5 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -3083,6 +3083,9 @@ static int btusb_mtk_hci_wmt_sync(struct hci_dev *hdev, goto err_free_wc; } + if (data->evt_skb == NULL) + goto err_free_wc; + /* Parse and handle the return WMT event */ wmt_evt = (struct btmtk_hci_wmt_evt *)data->evt_skb->data; if (wmt_evt->whdr.op != hdr->op) { -- 2.17.1

2 1

[PATCH openEuler-22.03-LTS-SP1] io_uring/io-wq: Use set_bit() and test_bit() at worker->flags
by Yifan Qiao 16 Jul '24

16 Jul '24

From: Breno Leitao <leitao(a)debian.org> stable inclusion from stable-v6.6.35 commit ab702c3483db9046bab9f40306f1a28b22dbbdc0 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IACR2Y CVE: CVE-2024-39508 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- [ Upstream commit 8a565304927fbd28c9f028c492b5c1714002cbab ] Utilize set_bit() and test_bit() on worker->flags within io_uring/io-wq to address potential data races. The structure io_worker->flags may be accessed through various data paths, leading to concurrency issues. When KCSAN is enabled, it reveals data races occurring in io_worker_handle_work and io_wq_activate_free_worker functions. BUG: KCSAN: data-race in io_worker_handle_work / io_wq_activate_free_worker write to 0xffff8885c4246404 of 4 bytes by task 49071 on cpu 28: io_worker_handle_work (io_uring/io-wq.c:434 io_uring/io-wq.c:569) io_wq_worker (io_uring/io-wq.c:?) <snip> read to 0xffff8885c4246404 of 4 bytes by task 49024 on cpu 5: io_wq_activate_free_worker (io_uring/io-wq.c:? io_uring/io-wq.c:285) io_wq_enqueue (io_uring/io-wq.c:947) io_queue_iowq (io_uring/io_uring.c:524) io_req_task_submit (io_uring/io_uring.c:1511) io_handle_tw_list (io_uring/io_uring.c:1198) <snip> Line numbers against commit 18daea77cca6 ("Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm"). These races involve writes and reads to the same memory location by different tasks running on different CPUs. To mitigate this, refactor the code to use atomic operations such as set_bit(), test_bit(), and clear_bit() instead of basic "and" and "or" operations. This ensures thread-safe manipulation of worker flags. Also, move `create_index` to avoid holes in the structure. Signed-off-by: Breno Leitao <leitao(a)debian.org> Link: https://lore.kernel.org/r/20240507170002.2269003-1-leitao@debian.org Signed-off-by: Jens Axboe <axboe(a)kernel.dk> Stable-dep-of: 91215f70ea85 ("io_uring/io-wq: avoid garbage value of 'match' in io_wq_enqueue()") Signed-off-by: Sasha Levin <sashal(a)kernel.org> Conflicts: io_uring/io-wq.c [The function names are different than cve commit. But their basic functions are same and they are using the io_worker in the same way.] Signed-off-by: Yifan Qiao <qiaoyifan4(a)huawei.com> --- io_uring/io-wq.c | 47 ++++++++++++++++++++++++----------------------- 1 file changed, 24 insertions(+), 23 deletions(-) diff --git a/io_uring/io-wq.c b/io_uring/io-wq.c index 6031fb319d87..cc31ebf3a1d5 100644 --- a/io_uring/io-wq.c +++ b/io_uring/io-wq.c @@ -21,10 +21,10 @@ #define WORKER_IDLE_TIMEOUT (5 * HZ) enum { - IO_WORKER_F_UP = 1, /* up and active */ - IO_WORKER_F_RUNNING = 2, /* account as running */ - IO_WORKER_F_FREE = 4, /* worker on free list */ - IO_WORKER_F_BOUND = 8, /* is doing bounded work */ + IO_WORKER_F_UP = 0, /* up and active */ + IO_WORKER_F_RUNNING = 1, /* account as running */ + IO_WORKER_F_FREE = 2, /* worker on free list */ + IO_WORKER_F_BOUND = 3, /* is doing bounded work */ }; enum { @@ -40,7 +40,8 @@ enum { */ struct io_worker { refcount_t ref; - unsigned flags; + int create_index; + unsigned long flags; struct hlist_nulls_node nulls_node; struct list_head all_list; struct task_struct *task; @@ -53,7 +54,6 @@ struct io_worker { unsigned long create_state; struct callback_head create_work; - int create_index; union { struct rcu_head rcu; @@ -167,7 +167,7 @@ static inline struct io_wqe_acct *io_work_get_acct(struct io_wqe *wqe, static inline struct io_wqe_acct *io_wqe_get_acct(struct io_worker *worker) { - return io_get_acct(worker->wqe, worker->flags & IO_WORKER_F_BOUND); + return io_get_acct(worker->wqe, test_bit(IO_WORKER_F_BOUND, &worker->flags)); } static void io_worker_ref_put(struct io_wq *wq) @@ -220,7 +220,7 @@ static void io_worker_exit(struct io_worker *worker) wait_for_completion(&worker->ref_done); raw_spin_lock(&wqe->lock); - if (worker->flags & IO_WORKER_F_FREE) + if (test_bit(IO_WORKER_F_FREE, &worker->flags)) hlist_nulls_del_rcu(&worker->nulls_node); list_del_rcu(&worker->all_list); preempt_disable(); @@ -389,7 +389,7 @@ static void io_wqe_dec_running(struct io_worker *worker) struct io_wqe_acct *acct = io_wqe_get_acct(worker); struct io_wqe *wqe = worker->wqe; - if (!(worker->flags & IO_WORKER_F_UP)) + if (!test_bit(IO_WORKER_F_UP, &worker->flags)) return; if (atomic_dec_and_test(&acct->nr_running) && io_acct_run_queue(acct)) { @@ -409,8 +409,8 @@ static void __io_worker_busy(struct io_wqe *wqe, struct io_worker *worker, struct io_wq_work *work) __must_hold(wqe->lock) { - if (worker->flags & IO_WORKER_F_FREE) { - worker->flags &= ~IO_WORKER_F_FREE; + if (test_bit(IO_WORKER_F_FREE, &worker->flags)) { + clear_bit(IO_WORKER_F_FREE, &worker->flags); hlist_nulls_del_init_rcu(&worker->nulls_node); } } @@ -425,8 +425,8 @@ static void __io_worker_busy(struct io_wqe *wqe, struct io_worker *worker, static void __io_worker_idle(struct io_wqe *wqe, struct io_worker *worker) __must_hold(wqe->lock) { - if (!(worker->flags & IO_WORKER_F_FREE)) { - worker->flags |= IO_WORKER_F_FREE; + if (!test_bit(IO_WORKER_F_FREE, &worker->flags)) { + set_bit(IO_WORKER_F_FREE, &worker->flags); hlist_nulls_add_head_rcu(&worker->nulls_node, &wqe->free_list); } } @@ -615,7 +615,8 @@ static int io_wqe_worker(void *data) bool last_timeout = false; char buf[TASK_COMM_LEN]; - worker->flags |= (IO_WORKER_F_UP | IO_WORKER_F_RUNNING); + set_mask_bits(&worker->flags, 0, + BIT(IO_WORKER_F_UP) | BIT(IO_WORKER_F_RUNNING)); snprintf(buf, sizeof(buf), "iou-wrk-%d", wq->task->pid); set_task_comm(current, buf); @@ -671,11 +672,11 @@ void io_wq_worker_running(struct task_struct *tsk) if (!worker) return; - if (!(worker->flags & IO_WORKER_F_UP)) + if (!test_bit(IO_WORKER_F_UP, &worker->flags)) return; - if (worker->flags & IO_WORKER_F_RUNNING) + if (test_bit(IO_WORKER_F_RUNNING, &worker->flags)) return; - worker->flags |= IO_WORKER_F_RUNNING; + set_bit(IO_WORKER_F_RUNNING, &worker->flags); io_wqe_inc_running(worker); } @@ -689,12 +690,12 @@ void io_wq_worker_sleeping(struct task_struct *tsk) if (!worker) return; - if (!(worker->flags & IO_WORKER_F_UP)) + if (!test_bit(IO_WORKER_F_UP, &worker->flags)) return; - if (!(worker->flags & IO_WORKER_F_RUNNING)) + if (!test_bit(IO_WORKER_F_RUNNING, &worker->flags)) return; - worker->flags &= ~IO_WORKER_F_RUNNING; + clear_bit(IO_WORKER_F_RUNNING, &worker->flags); raw_spin_lock(&worker->wqe->lock); io_wqe_dec_running(worker); @@ -712,7 +713,7 @@ static void io_init_new_worker(struct io_wqe *wqe, struct io_worker *worker, raw_spin_lock(&wqe->lock); hlist_nulls_add_head_rcu(&worker->nulls_node, &wqe->free_list); list_add_tail_rcu(&worker->all_list, &wqe->all_list); - worker->flags |= IO_WORKER_F_FREE; + set_bit(IO_WORKER_F_FREE, &worker->flags); raw_spin_unlock(&wqe->lock); wake_up_new_task(tsk); } @@ -816,7 +817,7 @@ static bool create_io_worker(struct io_wq *wq, struct io_wqe *wqe, int index) init_completion(&worker->ref_done); if (index == IO_WQ_ACCT_BOUND) - worker->flags |= IO_WORKER_F_BOUND; + set_bit(IO_WORKER_F_BOUND, &worker->flags); tsk = create_io_thread(io_wqe_worker, worker, wqe->node); if (!IS_ERR(tsk)) { @@ -904,7 +905,7 @@ static bool io_wq_work_match_item(struct io_wq_work *work, void *data) static void io_wqe_enqueue(struct io_wqe *wqe, struct io_wq_work *work) { struct io_wqe_acct *acct = io_work_get_acct(wqe, work); - unsigned work_flags = work->flags; + unsigned long work_flags = work->flags; bool do_create; /* -- 2.39.2

2 1

[PATCH OLK-5.10] io_uring/io-wq: Use set_bit() and test_bit() at worker->flags
by Yifan Qiao 16 Jul '24

16 Jul '24

From: Breno Leitao <leitao(a)debian.org> stable inclusion from stable-v6.6.35 commit ab702c3483db9046bab9f40306f1a28b22dbbdc0 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IACR2Y CVE: CVE-2024-39508 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- [ Upstream commit 8a565304927fbd28c9f028c492b5c1714002cbab ] Utilize set_bit() and test_bit() on worker->flags within io_uring/io-wq to address potential data races. The structure io_worker->flags may be accessed through various data paths, leading to concurrency issues. When KCSAN is enabled, it reveals data races occurring in io_worker_handle_work and io_wq_activate_free_worker functions. BUG: KCSAN: data-race in io_worker_handle_work / io_wq_activate_free_worker write to 0xffff8885c4246404 of 4 bytes by task 49071 on cpu 28: io_worker_handle_work (io_uring/io-wq.c:434 io_uring/io-wq.c:569) io_wq_worker (io_uring/io-wq.c:?) <snip> read to 0xffff8885c4246404 of 4 bytes by task 49024 on cpu 5: io_wq_activate_free_worker (io_uring/io-wq.c:? io_uring/io-wq.c:285) io_wq_enqueue (io_uring/io-wq.c:947) io_queue_iowq (io_uring/io_uring.c:524) io_req_task_submit (io_uring/io_uring.c:1511) io_handle_tw_list (io_uring/io_uring.c:1198) <snip> Line numbers against commit 18daea77cca6 ("Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm"). These races involve writes and reads to the same memory location by different tasks running on different CPUs. To mitigate this, refactor the code to use atomic operations such as set_bit(), test_bit(), and clear_bit() instead of basic "and" and "or" operations. This ensures thread-safe manipulation of worker flags. Also, move `create_index` to avoid holes in the structure. Signed-off-by: Breno Leitao <leitao(a)debian.org> Link: https://lore.kernel.org/r/20240507170002.2269003-1-leitao@debian.org Signed-off-by: Jens Axboe <axboe(a)kernel.dk> Stable-dep-of: 91215f70ea85 ("io_uring/io-wq: avoid garbage value of 'match' in io_wq_enqueue()") Signed-off-by: Sasha Levin <sashal(a)kernel.org> Conflicts: io_uring/io-wq.c [The function names are different than cve commit. But their basic functions are same and they are using the io_worker in the same way.] Signed-off-by: Yifan Qiao <qiaoyifan4(a)huawei.com> --- io_uring/io-wq.c | 47 ++++++++++++++++++++++++----------------------- 1 file changed, 24 insertions(+), 23 deletions(-) diff --git a/io_uring/io-wq.c b/io_uring/io-wq.c index fe8594a0396c..066f9ab708c6 100644 --- a/io_uring/io-wq.c +++ b/io_uring/io-wq.c @@ -21,10 +21,10 @@ #define WORKER_IDLE_TIMEOUT (5 * HZ) enum { - IO_WORKER_F_UP = 1, /* up and active */ - IO_WORKER_F_RUNNING = 2, /* account as running */ - IO_WORKER_F_FREE = 4, /* worker on free list */ - IO_WORKER_F_BOUND = 8, /* is doing bounded work */ + IO_WORKER_F_UP = 0, /* up and active */ + IO_WORKER_F_RUNNING = 1, /* account as running */ + IO_WORKER_F_FREE = 2, /* worker on free list */ + IO_WORKER_F_BOUND = 3, /* is doing bounded work */ }; enum { @@ -40,7 +40,8 @@ enum { */ struct io_worker { refcount_t ref; - unsigned flags; + int create_index; + unsigned long flags; struct hlist_nulls_node nulls_node; struct list_head all_list; struct task_struct *task; @@ -53,7 +54,6 @@ struct io_worker { unsigned long create_state; struct callback_head create_work; - int create_index; union { struct rcu_head rcu; @@ -167,7 +167,7 @@ static inline struct io_wqe_acct *io_work_get_acct(struct io_wqe *wqe, static inline struct io_wqe_acct *io_wqe_get_acct(struct io_worker *worker) { - return io_get_acct(worker->wqe, worker->flags & IO_WORKER_F_BOUND); + return io_get_acct(worker->wqe, test_bit(IO_WORKER_F_BOUND, &worker->flags)); } static void io_worker_ref_put(struct io_wq *wq) @@ -230,7 +230,7 @@ static void io_worker_exit(struct io_worker *worker) wait_for_completion(&worker->ref_done); raw_spin_lock(&wqe->lock); - if (worker->flags & IO_WORKER_F_FREE) + if (test_bit(IO_WORKER_F_FREE, &worker->flags)) hlist_nulls_del_rcu(&worker->nulls_node); list_del_rcu(&worker->all_list); preempt_disable(); @@ -399,7 +399,7 @@ static void io_wqe_dec_running(struct io_worker *worker) struct io_wqe_acct *acct = io_wqe_get_acct(worker); struct io_wqe *wqe = worker->wqe; - if (!(worker->flags & IO_WORKER_F_UP)) + if (!test_bit(IO_WORKER_F_UP, &worker->flags)) return; if (atomic_dec_and_test(&acct->nr_running) && io_acct_run_queue(acct)) { @@ -419,8 +419,8 @@ static void __io_worker_busy(struct io_wqe *wqe, struct io_worker *worker, struct io_wq_work *work) __must_hold(wqe->lock) { - if (worker->flags & IO_WORKER_F_FREE) { - worker->flags &= ~IO_WORKER_F_FREE; + if (test_bit(IO_WORKER_F_FREE, &worker->flags)) { + clear_bit(IO_WORKER_F_FREE, &worker->flags); hlist_nulls_del_init_rcu(&worker->nulls_node); } } @@ -435,8 +435,8 @@ static void __io_worker_busy(struct io_wqe *wqe, struct io_worker *worker, static void __io_worker_idle(struct io_wqe *wqe, struct io_worker *worker) __must_hold(wqe->lock) { - if (!(worker->flags & IO_WORKER_F_FREE)) { - worker->flags |= IO_WORKER_F_FREE; + if (!test_bit(IO_WORKER_F_FREE, &worker->flags)) { + set_bit(IO_WORKER_F_FREE, &worker->flags); hlist_nulls_add_head_rcu(&worker->nulls_node, &wqe->free_list); } } @@ -625,7 +625,8 @@ static int io_wqe_worker(void *data) bool last_timeout = false; char buf[TASK_COMM_LEN]; - worker->flags |= (IO_WORKER_F_UP | IO_WORKER_F_RUNNING); + set_mask_bits(&worker->flags, 0, + BIT(IO_WORKER_F_UP) | BIT(IO_WORKER_F_RUNNING)); snprintf(buf, sizeof(buf), "iou-wrk-%d", wq->task->pid); set_task_comm(current, buf); @@ -681,11 +682,11 @@ void io_wq_worker_running(struct task_struct *tsk) if (!worker) return; - if (!(worker->flags & IO_WORKER_F_UP)) + if (!test_bit(IO_WORKER_F_UP, &worker->flags)) return; - if (worker->flags & IO_WORKER_F_RUNNING) + if (test_bit(IO_WORKER_F_RUNNING, &worker->flags)) return; - worker->flags |= IO_WORKER_F_RUNNING; + set_bit(IO_WORKER_F_RUNNING, &worker->flags); io_wqe_inc_running(worker); } @@ -699,12 +700,12 @@ void io_wq_worker_sleeping(struct task_struct *tsk) if (!worker) return; - if (!(worker->flags & IO_WORKER_F_UP)) + if (!test_bit(IO_WORKER_F_UP, &worker->flags)) return; - if (!(worker->flags & IO_WORKER_F_RUNNING)) + if (!test_bit(IO_WORKER_F_RUNNING, &worker->flags)) return; - worker->flags &= ~IO_WORKER_F_RUNNING; + clear_bit(IO_WORKER_F_RUNNING, &worker->flags); raw_spin_lock(&worker->wqe->lock); io_wqe_dec_running(worker); @@ -722,7 +723,7 @@ static void io_init_new_worker(struct io_wqe *wqe, struct io_worker *worker, raw_spin_lock(&wqe->lock); hlist_nulls_add_head_rcu(&worker->nulls_node, &wqe->free_list); list_add_tail_rcu(&worker->all_list, &wqe->all_list); - worker->flags |= IO_WORKER_F_FREE; + set_bit(IO_WORKER_F_FREE, &worker->flags); raw_spin_unlock(&wqe->lock); wake_up_new_task(tsk); } @@ -826,7 +827,7 @@ static bool create_io_worker(struct io_wq *wq, struct io_wqe *wqe, int index) init_completion(&worker->ref_done); if (index == IO_WQ_ACCT_BOUND) - worker->flags |= IO_WORKER_F_BOUND; + set_bit(IO_WORKER_F_BOUND, &worker->flags); tsk = create_io_thread(io_wqe_worker, worker, wqe->node); if (!IS_ERR(tsk)) { @@ -914,7 +915,7 @@ static bool io_wq_work_match_item(struct io_wq_work *work, void *data) static void io_wqe_enqueue(struct io_wqe *wqe, struct io_wq_work *work) { struct io_wqe_acct *acct = io_work_get_acct(wqe, work); - unsigned work_flags = work->flags; + unsigned long work_flags = work->flags; bool do_create; /* -- 2.39.2

2 1

[PATCH openEuler-22.03-LTS-SP1] netpoll: Fix race condition in netpoll_owner_active
by Zhengchao Shao 16 Jul '24

16 Jul '24

From: Breno Leitao <leitao(a)debian.org> stable inclusion from stable-v5.10.221 commit 43c0ca793a18578a0f5b305dd77fcf7ed99f1265 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IACR1O CVE: CVE-2024-41005 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… --------------------------- [ Upstream commit c2e6a872bde9912f1a7579639c5ca3adf1003916 ] KCSAN detected a race condition in netpoll: BUG: KCSAN: data-race in net_rx_action / netpoll_send_skb write (marked) to 0xffff8881164168b0 of 4 bytes by interrupt on cpu 10: net_rx_action (./include/linux/netpoll.h:90 net/core/dev.c:6712 net/core/dev.c:6822) <snip> read to 0xffff8881164168b0 of 4 bytes by task 1 on cpu 2: netpoll_send_skb (net/core/netpoll.c:319 net/core/netpoll.c:345 net/core/netpoll.c:393) netpoll_send_udp (net/core/netpoll.c:?) <snip> value changed: 0x0000000a -> 0xffffffff This happens because netpoll_owner_active() needs to check if the current CPU is the owner of the lock, touching napi->poll_owner non atomically. The ->poll_owner field contains the current CPU holding the lock. Use an atomic read to check if the poll owner is the current CPU. Signed-off-by: Breno Leitao <leitao(a)debian.org> Link: https://lore.kernel.org/r/20240429100437.3487432-1-leitao@debian.org Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Zhengchao Shao <shaozhengchao(a)huawei.com> --- net/core/netpoll.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/core/netpoll.c b/net/core/netpoll.c index 960948290001..fd7375625dad 100644 --- a/net/core/netpoll.c +++ b/net/core/netpoll.c @@ -299,7 +299,7 @@ static int netpoll_owner_active(struct net_device *dev) struct napi_struct *napi; list_for_each_entry_rcu(napi, &dev->napi_list, dev_list) { - if (napi->poll_owner == smp_processor_id()) + if (READ_ONCE(napi->poll_owner) == smp_processor_id()) return 1; } return 0; -- 2.34.1

2 1