From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Yafang <laoar.shao@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Jiri Olsa <olsajiri@gmail.com>, Hao Luo <haoluo@google.com>,
Alexei Starovoitov <ast@kernel.org>,
Sasha Levin <sashal@kernel.org>,
daniel@iogearbox.net, andrii@kernel.org, bpf@vger.kernel.org
Subject: [PATCH AUTOSEL 5.15 20/30] bpf: Add preempt_count_{sub,add} into btf id deny list
Date: Thu, 4 May 2023 15:48:13 -0400 [thread overview]
Message-ID: <20230504194824.3808028-20-sashal@kernel.org> (raw)
In-Reply-To: <20230504194824.3808028-1-sashal@kernel.org>
From: Yafang <laoar.shao@gmail.com>
[ Upstream commit c11bd046485d7bf1ca200db0e7d0bdc4bafdd395 ]
The recursion check in __bpf_prog_enter* and __bpf_prog_exit*
leave preempt_count_{sub,add} unprotected. When attaching trampoline to
them we get panic as follows,
[ 867.843050] BUG: TASK stack guard page was hit at 0000000009d325cf (stack is 0000000046a46a15..00000000537e7b28)
[ 867.843064] stack guard page: 0000 [#1] PREEMPT SMP NOPTI
[ 867.843067] CPU: 8 PID: 11009 Comm: trace Kdump: loaded Not tainted 6.2.0+ #4
[ 867.843100] Call Trace:
[ 867.843101] <TASK>
[ 867.843104] asm_exc_int3+0x3a/0x40
[ 867.843108] RIP: 0010:preempt_count_sub+0x1/0xa0
[ 867.843135] __bpf_prog_enter_recur+0x17/0x90
[ 867.843148] bpf_trampoline_6442468108_0+0x2e/0x1000
[ 867.843154] ? preempt_count_sub+0x1/0xa0
[ 867.843157] preempt_count_sub+0x5/0xa0
[ 867.843159] ? migrate_enable+0xac/0xf0
[ 867.843164] __bpf_prog_exit_recur+0x2d/0x40
[ 867.843168] bpf_trampoline_6442468108_0+0x55/0x1000
...
[ 867.843788] preempt_count_sub+0x5/0xa0
[ 867.843793] ? migrate_enable+0xac/0xf0
[ 867.843829] __bpf_prog_exit_recur+0x2d/0x40
[ 867.843837] BUG: IRQ stack guard page was hit at 0000000099bd8228 (stack is 00000000b23e2bc4..000000006d95af35)
[ 867.843841] BUG: IRQ stack guard page was hit at 000000005ae07924 (stack is 00000000ffd69623..0000000014eb594c)
[ 867.843843] BUG: IRQ stack guard page was hit at 00000000028320f0 (stack is 00000000034b6438..0000000078d1bcec)
[ 867.843842] bpf_trampoline_6442468108_0+0x55/0x1000
...
That is because in __bpf_prog_exit_recur, the preempt_count_{sub,add} are
called after prog->active is decreased.
Fixing this by adding these two functions into btf ids deny list.
Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Yafang <laoar.shao@gmail.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Jiri Olsa <olsajiri@gmail.com>
Acked-by: Hao Luo <haoluo@google.com>
Link: https://lore.kernel.org/r/20230413025248.79764-1-laoar.shao@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
kernel/bpf/verifier.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 1c95d97e7aa53..d37ecd76cc5a1 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -13632,6 +13632,10 @@ BTF_ID(func, migrate_enable)
#if !defined CONFIG_PREEMPT_RCU && !defined CONFIG_TINY_RCU
BTF_ID(func, rcu_read_unlock_strict)
#endif
+#if defined(CONFIG_DEBUG_PREEMPT) || defined(CONFIG_TRACE_PREEMPT_TOGGLE)
+BTF_ID(func, preempt_count_add)
+BTF_ID(func, preempt_count_sub)
+#endif
BTF_SET_END(btf_id_deny)
static int check_attach_btf_id(struct bpf_verifier_env *env)
--
2.39.2
next prev parent reply other threads:[~2023-05-04 19:58 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-04 19:47 [PATCH AUTOSEL 5.15 01/30] wifi: ath: Silence memcpy run-time false positive warning Sasha Levin
2023-05-04 19:47 ` [PATCH AUTOSEL 5.15 02/30] bpf: Annotate data races in bpf_local_storage Sasha Levin
2023-05-04 19:47 ` [PATCH AUTOSEL 5.15 03/30] wifi: brcmfmac: cfg80211: Pass the PMK in binary instead of hex Sasha Levin
2023-05-04 19:47 ` [PATCH AUTOSEL 5.15 04/30] ext2: Check block size validity during mount Sasha Levin
2023-05-04 19:47 ` [PATCH AUTOSEL 5.15 05/30] scsi: lpfc: Prevent lpfc_debugfs_lockstat_write() buffer overflow Sasha Levin
2023-05-04 19:47 ` [PATCH AUTOSEL 5.15 06/30] wifi: brcmfmac: slab-out-of-bounds read in brcmf_get_assoc_ies() Sasha Levin
2023-05-04 19:48 ` [PATCH AUTOSEL 5.15 07/30] bnxt: avoid overflow in bnxt_get_nvram_directory() Sasha Levin
2023-05-04 19:48 ` [PATCH AUTOSEL 5.15 08/30] net: pasemi: Fix return type of pasemi_mac_start_tx() Sasha Levin
2023-05-04 19:48 ` [PATCH AUTOSEL 5.15 09/30] net: Catch invalid index in XPS mapping Sasha Levin
2023-05-04 19:48 ` [PATCH AUTOSEL 5.15 10/30] scsi: target: iscsit: Free cmds before session free Sasha Levin
2023-05-04 19:48 ` [PATCH AUTOSEL 5.15 11/30] lib: cpu_rmap: Avoid use after free on rmap->obj array entries Sasha Levin
2023-05-04 19:48 ` [PATCH AUTOSEL 5.15 12/30] scsi: message: mptlan: Fix use after free bug in mptlan_remove() due to race condition Sasha Levin
2023-05-04 19:48 ` [PATCH AUTOSEL 5.15 13/30] gfs2: Fix inode height consistency check Sasha Levin
2023-05-04 19:48 ` [PATCH AUTOSEL 5.15 14/30] scsi: ufs: ufs-pci: Add support for Intel Lunar Lake Sasha Levin
2023-05-04 19:48 ` [PATCH AUTOSEL 5.15 15/30] ext4: set goal start correctly in ext4_mb_normalize_request Sasha Levin
2023-05-04 19:48 ` [PATCH AUTOSEL 5.15 16/30] ext4: Fix best extent lstart adjustment logic in ext4_mb_new_inode_pa() Sasha Levin
2023-05-04 19:48 ` [PATCH AUTOSEL 5.15 17/30] f2fs: fix to drop all dirty pages during umount() if cp_error is set Sasha Levin
2023-05-04 19:48 ` [PATCH AUTOSEL 5.15 18/30] f2fs: fix to check readonly condition correctly Sasha Levin
2023-05-04 19:48 ` [PATCH AUTOSEL 5.15 19/30] samples/bpf: Fix fout leak in hbm's run_bpf_prog Sasha Levin
2023-05-04 19:48 ` Sasha Levin [this message]
2023-05-04 19:48 ` [PATCH AUTOSEL 5.15 21/30] wifi: iwlwifi: pcie: fix possible NULL pointer dereference Sasha Levin
2023-05-04 19:48 ` [PATCH AUTOSEL 5.15 22/30] wifi: iwlwifi: pcie: Fix integer overflow in iwl_write_to_user_buf Sasha Levin
2023-05-04 19:48 ` [PATCH AUTOSEL 5.15 23/30] null_blk: Always check queue mode setting from configfs Sasha Levin
2023-05-04 19:48 ` [PATCH AUTOSEL 5.15 24/30] wifi: iwlwifi: dvm: Fix memcpy: detected field-spanning write backtrace Sasha Levin
2023-05-04 19:48 ` [PATCH AUTOSEL 5.15 25/30] wifi: ath11k: Fix SKB corruption in REO destination ring Sasha Levin
2023-05-04 19:48 ` [PATCH AUTOSEL 5.15 26/30] nbd: fix incomplete validation of ioctl arg Sasha Levin
2023-05-04 19:48 ` [PATCH AUTOSEL 5.15 27/30] ipvs: Update width of source for ip_vs_sync_conn_options Sasha Levin
2023-05-04 19:48 ` [PATCH AUTOSEL 5.15 28/30] Bluetooth: btintel: Add LE States quirk support Sasha Levin
2023-05-04 19:48 ` [PATCH AUTOSEL 5.15 29/30] Bluetooth: hci_bcm: Fall back to getting bdaddr from EFI if not set Sasha Levin
2023-05-04 19:48 ` [PATCH AUTOSEL 5.15 30/30] Bluetooth: L2CAP: fix "bad unlock balance" in l2cap_disconnect_rsp Sasha Levin
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