[syzbot] [net?] KMSAN: kernel-infoleak in __skb_datagram_iter (2)

[syzbot] [net?] KMSAN: kernel-infoleak in __skb_datagram_iter (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    5bd7ef53ffe5 Merge tag 'pull-fixes' of git://git.kernel.or..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=13c1aee6e80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f3f069371247b697
dashboard link: https://syzkaller.appspot.com/bug?extid=34ad5fab48f7bf510349
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15555751e80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10c93571e80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/cd1e7587b624/disk-5bd7ef53.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/62969c864f78/vmlinux-5bd7ef53.xz
kernel image: https://storage.googleapis.com/syzbot-assets/af66253a313c/bzImage-5bd7ef53.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+34ad5fab48f7bf510349@syzkaller.appspotmail.com

=====================================================
BUG: KMSAN: kernel-infoleak-after-free in instrument_copy_to_user include/linux/instrumented.h:114 [inline]
BUG: KMSAN: kernel-infoleak-after-free in copy_to_user_iter lib/iov_iter.c:24 [inline]
BUG: KMSAN: kernel-infoleak-after-free in iterate_ubuf include/linux/iov_iter.h:29 [inline]
BUG: KMSAN: kernel-infoleak-after-free in iterate_and_advance2 include/linux/iov_iter.h:245 [inline]
BUG: KMSAN: kernel-infoleak-after-free in iterate_and_advance include/linux/iov_iter.h:271 [inline]
BUG: KMSAN: kernel-infoleak-after-free in _copy_to_iter+0x364/0x2520 lib/iov_iter.c:186
 instrument_copy_to_user include/linux/instrumented.h:114 [inline]
 copy_to_user_iter lib/iov_iter.c:24 [inline]
 iterate_ubuf include/linux/iov_iter.h:29 [inline]
 iterate_and_advance2 include/linux/iov_iter.h:245 [inline]
 iterate_and_advance include/linux/iov_iter.h:271 [inline]
 _copy_to_iter+0x364/0x2520 lib/iov_iter.c:186
 copy_to_iter include/linux/uio.h:197 [inline]
 simple_copy_to_iter+0x68/0xa0 net/core/datagram.c:532
 __skb_datagram_iter+0x123/0xdc0 net/core/datagram.c:420
 skb_copy_datagram_iter+0x5c/0x200 net/core/datagram.c:546
 skb_copy_datagram_msg include/linux/skbuff.h:3960 [inline]
 packet_recvmsg+0xd9c/0x2000 net/packet/af_packet.c:3482
 sock_recvmsg_nosec net/socket.c:1044 [inline]
 sock_recvmsg net/socket.c:1066 [inline]
 sock_read_iter+0x467/0x580 net/socket.c:1136
 call_read_iter include/linux/fs.h:2014 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x8f6/0xe00 fs/read_write.c:470
 ksys_read+0x20f/0x4c0 fs/read_write.c:613
 __do_sys_read fs/read_write.c:623 [inline]
 __se_sys_read fs/read_write.c:621 [inline]
 __x64_sys_read+0x93/0xd0 fs/read_write.c:621
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Uninit was stored to memory at:
 skb_put_data include/linux/skbuff.h:2622 [inline]
 netlink_to_full_skb net/netlink/af_netlink.c:181 [inline]
 __netlink_deliver_tap_skb net/netlink/af_netlink.c:298 [inline]
 __netlink_deliver_tap+0x5be/0xc90 net/netlink/af_netlink.c:325
 netlink_deliver_tap net/netlink/af_netlink.c:338 [inline]
 netlink_deliver_tap_kernel net/netlink/af_netlink.c:347 [inline]
 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]
 netlink_unicast+0x10f1/0x1250 net/netlink/af_netlink.c:1368
 netlink_sendmsg+0x1238/0x13d0 net/netlink/af_netlink.c:1910
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2584
 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2638
 __sys_sendmsg net/socket.c:2667 [inline]
 __do_sys_sendmsg net/socket.c:2676 [inline]
 __se_sys_sendmsg net/socket.c:2674 [inline]
 __x64_sys_sendmsg+0x307/0x490 net/socket.c:2674
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Uninit was created at:
 free_pages_prepare mm/page_alloc.c:1087 [inline]
 free_unref_page_prepare+0xb0/0xa40 mm/page_alloc.c:2347
 free_unref_page_list+0xeb/0x1100 mm/page_alloc.c:2533
 release_pages+0x23d3/0x2410 mm/swap.c:1042
 free_pages_and_swap_cache+0xd9/0xf0 mm/swap_state.c:316
 tlb_batch_pages_flush mm/mmu_gather.c:98 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:293 [inline]
 tlb_flush_mmu+0x6f5/0x980 mm/mmu_gather.c:300
 tlb_finish_mmu+0x101/0x260 mm/mmu_gather.c:392
 exit_mmap+0x49e/0xd30 mm/mmap.c:3321
 __mmput+0x13f/0x530 kernel/fork.c:1349
 mmput+0x8a/0xa0 kernel/fork.c:1371
 exit_mm+0x1b8/0x360 kernel/exit.c:567
 do_exit+0xd57/0x4080 kernel/exit.c:858
 do_group_exit+0x2fd/0x390 kernel/exit.c:1021
 __do_sys_exit_group kernel/exit.c:1032 [inline]
 __se_sys_exit_group kernel/exit.c:1030 [inline]
 __x64_sys_exit_group+0x3c/0x50 kernel/exit.c:1030
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Bytes 3852-3903 of 3904 are uninitialized
Memory access of size 3904 starts at ffff88812ea1e000
Data copied to user address 0000000020003280

CPU: 1 PID: 5043 Comm: syz-executor297 Not tainted 6.7.0-rc5-syzkaller-00047-g5bd7ef53ffe5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
=====================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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syzbot will keep track of this issue. See:
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If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

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#syz undup

Re: [syzbot] [PATCH] net: Fix kernel-infoleak in __skb_datagram_iter (2)

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: [PATCH] net: Fix kernel-infoleak in __skb_datagram_iter (2)
Author: ryasuoka@redhat.com

#syz test

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 27998f73183e..c7bf1c38b292 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2532,6 +2532,11 @@ static inline unsigned char
*skb_tail_pointer(const struct sk_buff *skb)
        return skb->head + skb->tail;
 }

+static inline unsigned int skb_tail_offset(const struct sk_buff *skb)
+{
+       return skb->tail;
+}
+
 static inline void skb_reset_tail_pointer(struct sk_buff *skb)
 {
        skb->tail = skb->data - skb->head;
@@ -2549,6 +2554,11 @@ static inline unsigned char
*skb_tail_pointer(const struct sk_buff *skb)
        return skb->tail;
 }

+static inline unsigned int skb_tail_offset(const struct sk_buff *skb)
+{
+       return skb->tail - skb->head;
+}
+
 static inline void skb_reset_tail_pointer(struct sk_buff *skb)
 {
        skb->tail = skb->data;
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index eb086b06d60d..f11bb308f1ed 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -167,7 +167,7 @@ static inline u32 netlink_group_mask(u32 group)
 static struct sk_buff *netlink_to_full_skb(const struct sk_buff *skb,
                                           gfp_t gfp_mask)
 {
-       unsigned int len = skb_end_offset(skb);
+       unsigned int len = skb_tail_offset(skb);
        struct sk_buff *new;

        new = alloc_skb(len, gfp_mask);

Re: [syzbot] Re: [PATCH] net: Fix kernel-infoleak in __skb_datagram_iter (2)

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: Re: [PATCH] net: Fix kernel-infoleak in __skb_datagram_iter (2)
Author: ryasuoka@redhat.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
master

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 2dde34c29203..540df9a6a9b3 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2542,6 +2542,11 @@ static inline unsigned char
*skb_tail_pointer(const struct sk_buff *skb)
        return skb->head + skb->tail;
 }

+static inline unsigned int skb_tail_offset(const struct sk_buff *skb)
+{
+       return skb->tail;
+}
+
 static inline void skb_reset_tail_pointer(struct sk_buff *skb)
 {
        skb->tail = skb->data - skb->head;
@@ -2559,6 +2564,11 @@ static inline unsigned char
*skb_tail_pointer(const struct sk_buff *skb)
        return skb->tail;
 }

+static inline unsigned int skb_tail_offset(const struct sk_buff *skb)
+{
+       return skb->tail - skb->head;
+}
+
 static inline void skb_reset_tail_pointer(struct sk_buff *skb)
 {
        skb->tail = skb->data;
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 9c962347cf85..d1b8e02c7e44 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -167,7 +167,7 @@ static inline u32 netlink_group_mask(u32 group)
 static struct sk_buff *netlink_to_full_skb(const struct sk_buff *skb,
                                           gfp_t gfp_mask)
 {
-       unsigned int len = skb_end_offset(skb);
+       unsigned int len = skb_tail_offset(skb);
        struct sk_buff *new;

        new = alloc_skb(len, gfp_mask);

Re: [syzbot] Re: [PATCH] net: Fix kernel-infoleak in __skb_datagram_iter (2)

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: Re: [PATCH] net: Fix kernel-infoleak in __skb_datagram_iter (2)
Author: ryasuoka@redhat.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
9f8413c4a66f

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 27998f73183e..c7bf1c38b292 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2532,6 +2532,11 @@ static inline unsigned char
*skb_tail_pointer(const struct sk_buff *skb)
  return skb->head + skb->tail;
 }

+static inline unsigned int skb_tail_offset(const struct sk_buff *skb)
+{
+ return skb->tail;
+}
+
 static inline void skb_reset_tail_pointer(struct sk_buff *skb)
 {
  skb->tail = skb->data - skb->head;
@@ -2549,6 +2554,11 @@ static inline unsigned char
*skb_tail_pointer(const struct sk_buff *skb)
  return skb->tail;
 }

+static inline unsigned int skb_tail_offset(const struct sk_buff *skb)
+{
+ return skb->tail - skb->head;
+}
+
 static inline void skb_reset_tail_pointer(struct sk_buff *skb)
 {
  skb->tail = skb->data;
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index eb086b06d60d..f11bb308f1ed 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -167,7 +167,7 @@ static inline u32 netlink_group_mask(u32 group)
 static struct sk_buff *netlink_to_full_skb(const struct sk_buff *skb,
     gfp_t gfp_mask)
 {
- unsigned int len = skb_end_offset(skb);
+ unsigned int len = skb_tail_offset(skb);
  struct sk_buff *new;

  new = alloc_skb(len, gfp_mask);

Re: [syzbot] [PATCH net] netlink: Fix kernel-infoleak in __skb_datagram_iter()

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: [PATCH net] netlink: Fix kernel-infoleak in __skb_datagram_iter()
Author: ryasuoka@redhat.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5bd7ef53ffe5

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index eb086b06d60d..8277399d19b3 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -167,7 +167,7 @@ static inline u32 netlink_group_mask(u32 group)
 static struct sk_buff *netlink_to_full_skb(const struct sk_buff *skb,
                                           gfp_t gfp_mask)
 {
-       unsigned int len = skb_end_offset(skb);
+       unsigned int len = skb->len;
        struct sk_buff *new;

        new = alloc_skb(len, gfp_mask);

Re: [syzbot] [PATCH net] netlink: Fix kernel-infoleak in __skb_datagram_iter()

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: [PATCH net] netlink: Fix kernel-infoleak in __skb_datagram_iter()
Author: ryasuoka@redhat.com

#syz test

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 9c962347cf85..ff315351269f 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -167,7 +167,7 @@ static inline u32 netlink_group_mask(u32 group)
 static struct sk_buff *netlink_to_full_skb(const struct sk_buff *skb,
                                           gfp_t gfp_mask)
 {
-       unsigned int len = skb_end_offset(skb);
+       unsigned int len = skb->len;
        struct sk_buff *new;

        new = alloc_skb(len, gfp_mask);

Re: [syzbot] Test for 34ad5fab48f7bf510349

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: Test for 34ad5fab48f7bf510349
Author: syoshida@redhat.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5bd7ef53ffe5ca580e93e74eb8c81ed191ddc4bd

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 9c962347cf85..c9ad41bce426 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -167,7 +167,8 @@ static inline u32 netlink_group_mask(u32 group)
 static struct sk_buff *netlink_to_full_skb(const struct sk_buff *skb,
 					   gfp_t gfp_mask)
 {
-	unsigned int len = skb_end_offset(skb);
+	//unsigned int len = skb_end_offset(skb);
+	unsigned int len = skb->len;
 	struct sk_buff *new;
 
 	new = alloc_skb(len, gfp_mask);

Re: [syzbot] [PATCH net] netlink: Fix kernel-infoleak in __skb_datagram_iter()

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: [PATCH net] netlink: Fix kernel-infoleak in __skb_datagram_iter()
Author: ryasuoka@redhat.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5bd7ef53ffe5ca580e93e74eb8c81ed191ddc4bd

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index eb086b06d60d..8277399d19b3 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -167,7 +167,7 @@ static inline u32 netlink_group_mask(u32 group)
 static struct sk_buff *netlink_to_full_skb(const struct sk_buff *skb,
                                           gfp_t gfp_mask)
 {
-       unsigned int len = skb_end_offset(skb);
+       unsigned int len = skb->len;
        struct sk_buff *new;

        new = alloc_skb(len, gfp_mask);

Re: [syzbot] [net?] KMSAN: kernel-infoleak in __skb_datagram_iter (2)

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to apply patch:
checking file include/linux/skbuff.h
patch: **** malformed patch at line 8: diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c




Tested on:

commit:         8d3dea21 Merge tag 'mips-fixes_6.8_2' of git://git.ker..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=f3f069371247b697
dashboard link: https://syzkaller.appspot.com/bug?extid=34ad5fab48f7bf510349
compiler:       
patch:          https://syzkaller.appspot.com/x/patch.diff?x=15ddfa78180000

Re: [syzbot] [net?] KMSAN: kernel-infoleak in __skb_datagram_iter (2)

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to apply patch:
checking file include/linux/skbuff.h
patch: **** malformed patch at line 8: diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c




Tested on:

commit:         c1ca10ce Merge tag 'scsi-fixes' of git://git.kernel.or..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=f3f069371247b697
dashboard link: https://syzkaller.appspot.com/bug?extid=34ad5fab48f7bf510349
compiler:       
patch:          https://syzkaller.appspot.com/x/patch.diff?x=12296ac2180000

Re: [syzbot] [net?] KMSAN: kernel-infoleak in __skb_datagram_iter (2)

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to checkout kernel repo git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git on commit 9f8413c4a66f: failed to run ["git" "fetch" "--force" "--tags" "f569e972c8e9057ee9c286220c83a480ebf30cc5" "9f8413c4a66f"]: exit status 128
fatal: couldn't find remote ref 9f8413c4a66f



Tested on:

commit:         [unknown 
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 9f8413c4a66f
kernel config:  https://syzkaller.appspot.com/x/.config?x=f3f069371247b697
dashboard link: https://syzkaller.appspot.com/bug?extid=34ad5fab48f7bf510349
compiler:       
patch:          https://syzkaller.appspot.com/x/patch.diff?x=111c98f8180000

Re: [syzbot] [net?] KMSAN: kernel-infoleak in __skb_datagram_iter (2)

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to checkout kernel repo git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git on commit 5bd7ef53ffe5: failed to run ["git" "fetch" "--force" "--tags" "f569e972c8e9057ee9c286220c83a480ebf30cc5" "5bd7ef53ffe5"]: exit status 128
fatal: couldn't find remote ref 5bd7ef53ffe5



Tested on:

commit:         [unknown 
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5bd7ef53ffe5
kernel config:  https://syzkaller.appspot.com/x/.config?x=f3f069371247b697
dashboard link: https://syzkaller.appspot.com/bug?extid=34ad5fab48f7bf510349
compiler:       
patch:          https://syzkaller.appspot.com/x/patch.diff?x=17c8b658180000

Re: [syzbot] [net?] KMSAN: kernel-infoleak in __skb_datagram_iter (2)

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

.
[   10.076074][    T1] fuse: init (API version 7.39)
[   10.080364][    T1] orangefs_debugfs_init: called with debug mask: :none: :0:
[   10.082002][    T1] orangefs_init: module version upstream loaded
[   10.083592][    T1] JFS: nTxBlock = 8192, nTxLock = 65536
[   10.099770][    T1] SGI XFS with ACLs, security attributes, realtime, quota, no debug enabled
[   10.104241][    T1] 9p: Installing v9fs 9p2000 file system support
[   10.105539][    T1] NILFS version 2 loaded
[   10.106156][    T1] befs: version: 0.9.3
[   10.107195][    T1] ocfs2: Registered cluster interface o2cb
[   10.108527][    T1] ocfs2: Registered cluster interface user
[   10.111379][    T1] OCFS2 User DLM kernel interface loaded
[   10.118460][    T1] gfs2: GFS2 installed
[   10.135588][    T1] ceph: loaded (mds proto 32)
[   12.024322][    T1] NET: Registered PF_ALG protocol family
[   12.025308][    T1] xor: automatically using best checksumming function   avx       
[   12.027314][    T1] async_tx: api initialized (async)
[   12.028180][    T1] Key type asymmetric registered
[   12.029109][    T1] Asymmetric key parser 'x509' registered
[   12.030157][    T1] Asymmetric key parser 'pkcs8' registered
[   12.030980][    T1] Key type pkcs7_test registered
[   12.032530][    T1] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 240)
[   12.034815][    T1] io scheduler mq-deadline registered
[   12.035601][    T1] io scheduler kyber registered
[   12.036477][    T1] io scheduler bfq registered
[   12.043584][    T1] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0
[   12.054905][    T1] ACPI: button: Power Button [PWRF]
[   12.061506][    T1] input: Sleep Button as /devices/LNXSYSTM:00/LNXSLPBN:00/input/input1
[   12.071048][    T1] ACPI: button: Sleep Button [SLPF]
[   12.086912][    T1] ioatdma: Intel(R) QuickData Technology Driver 5.00
[   12.130351][    T1] ACPI: \_SB_.LNKC: Enabled at IRQ 11
[   12.135899][    T1] virtio-pci 0000:00:03.0: virtio_pci: leaving for legacy driver
[   12.175460][    T1] ACPI: \_SB_.LNKD: Enabled at IRQ 10
[   12.181044][    T1] virtio-pci 0000:00:04.0: virtio_pci: leaving for legacy driver
[   12.221372][    T1] ACPI: \_SB_.LNKB: Enabled at IRQ 10
[   12.226897][    T1] virtio-pci 0000:00:06.0: virtio_pci: leaving for legacy driver
[   12.317580][  T257] kworker/u4:0 (257) used greatest stack depth: 11000 bytes left
[   12.798023][    T1] N_HDLC line discipline registered with maxframe=4096
[   12.805613][    T1] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[   12.815494][    T1] 00:03: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
[   12.835349][    T1] 00:04: ttyS1 at I/O 0x2f8 (irq = 3, base_baud = 115200) is a 16550A
[   12.855309][    T1] 00:05: ttyS2 at I/O 0x3e8 (irq = 6, base_baud = 115200) is a 16550A
[   12.875589][    T1] 00:06: ttyS3 at I/O 0x2e8 (irq = 7, base_baud = 115200) is a 16550A
[   12.907146][    T1] Non-volatile memory driver v1.3
[   12.921393][    T1] Linux agpgart interface v0.103
[   12.931868][    T1] ACPI: bus type drm_connector registered
[   12.943489][    T1] [drm] Initialized vgem 1.0.0 20120112 for vgem on minor 0
[   12.959783][    T1] [drm] Initialized vkms 1.0.0 20180514 for vkms on minor 1
[   13.248241][    T1] Console: switching to colour frame buffer device 128x48
[   13.314754][    T1] platform vkms: [drm] fb0: vkmsdrmfb frame buffer device
[   13.322329][    T1] usbcore: registered new interface driver udl
[   13.472888][    T1] brd: module loaded
[   13.561610][    T1] loop: module loaded
[   13.689528][    T1] zram: Added device: zram0
[   13.702671][    T1] null_blk: disk nullb0 created
[   13.707565][    T1] null_blk: module loaded
[   13.712923][    T1] Guest personality initialized and is inactive
[   13.719805][    T1] VMCI host device registered (name=vmci, major=10, minor=118)
[   13.727398][    T1] Initialized host personality
[   13.732444][    T1] usbcore: registered new interface driver rtsx_usb
[   13.741306][    T1] usbcore: registered new interface driver viperboard
[   13.748470][    T1] usbcore: registered new interface driver dln2
[   13.755172][    T1] usbcore: registered new interface driver pn533_usb
[   13.765466][    T1] nfcsim 0.2 initialized
[   13.769944][    T1] usbcore: registered new interface driver port100
[   13.776737][    T1] usbcore: registered new interface driver nfcmrvl
[   13.789159][    T1] Loading iSCSI transport class v2.0-870.
[   13.809621][    T1] virtio_scsi virtio0: 1/0/0 default/read/poll queues
[   13.830894][    T1] scsi host0: Virtio SCSI HBA
[   14.080706][    T1] st: Version 20160209, fixed bufsize 32768, s/g segs 256
[   14.093000][   T41] scsi 0:0:1:0: Direct-Access     Google   PersistentDisk   1    PQ: 0 ANSI: 6
[   14.119106][    T1] Rounding down aligned max_sectors from 4294967295 to 4294967288
[   14.128024][    T1] db_root: cannot open: /etc/target
[   14.157608][    T1] =====================================================
[   14.157758][    T1] BUG: KMSAN: use-after-free in __list_del_entry_valid_or_report+0x19e/0x490
[   14.157853][    T1]  __list_del_entry_valid_or_report+0x19e/0x490
[   14.157942][    T1]  stack_depot_save_flags+0x3e7/0x7b0
[   14.158005][    T1]  stack_depot_save+0x12/0x20
[   14.158059][    T1]  ref_tracker_alloc+0x215/0x700
[   14.158123][    T1]  linkwatch_fire_event+0x32b/0x6d0
[   14.158208][    T1]  netif_carrier_off+0xec/0x110
[   14.158278][    T1]  bond_create+0x19d/0x2a0
[   14.158354][    T1]  bonding_init+0x1a7/0x2d0
[   14.158412][    T1]  do_one_initcall+0x216/0x960
[   14.158478][    T1]  do_initcall_level+0x140/0x350
[   14.158540][    T1]  do_initcalls+0xf0/0x1d0
[   14.158595][    T1]  do_basic_setup+0x22/0x30
[   14.158651][    T1]  kernel_init_freeable+0x300/0x4b0
[   14.158713][    T1]  kernel_init+0x2f/0x7e0
[   14.158781][    T1]  ret_from_fork+0x66/0x80
[   14.158855][    T1]  ret_from_fork_asm+0x11/0x20
[   14.158921][    T1] 
[   14.158930][    T1] Uninit was created at:
[   14.158959][    T1]  __free_pages_ok+0x133/0xeb0
[   14.159060][    T1]  alloc_pages_exact+0x2f5/0x350
[   14.159060][    T1]  vring_alloc_queue_split+0x2d9/0x990
[   14.159060][    T1]  vring_create_virtqueue_split+0x89/0x380
[   14.159060][    T1]  vring_create_virtqueue+0x101/0x1a0
[   14.159060][    T1]  setup_vq+0x175/0x510
[   14.159060][    T1]  vp_setup_vq+0x103/0x630
[   14.159060][    T1]  vp_find_vqs_msix+0x1162/0x16c0
[   14.159060][    T1]  vp_find_vqs+0x78/0x770
[   14.159060][    T1]  virtscsi_init+0xff7/0x17a0
[   14.159060][    T1]  virtscsi_probe+0x43b/0xfe0
[   14.159060][    T1]  virtio_dev_probe+0x16df/0x1900
[   14.159060][    T1]  really_probe+0x506/0xf40
[   14.159060][    T1]  __driver_probe_device+0x2a7/0x5d0
[   14.159060][    T1]  driver_probe_device+0x72/0x7b0
[   14.159060][    T1]  __driver_attach+0x710/0xa30
[   14.159060][    T1]  bus_for_each_dev+0x34c/0x530
[   14.159060][    T1]  driver_attach+0x51/0x60
[   14.159060][    T1]  bus_add_driver+0x747/0xca0
[   14.159060][    T1]  driver_register+0x3fb/0x650
[   14.159060][    T1]  register_virtio_driver+0xd1/0xf0
[   14.159060][    T1]  virtio_scsi_init+0x123/0x2f0
[   14.159060][    T1]  do_one_initcall+0x216/0x960
[   14.159060][    T1]  do_initcall_level+0x140/0x350
[   14.159060][    T1]  do_initcalls+0xf0/0x1d0
[   14.159060][    T1]  do_basic_setup+0x22/0x30
[   14.159060][    T1]  kernel_init_freeable+0x300/0x4b0
[   14.159060][    T1]  kernel_init+0x2f/0x7e0
[   14.159060][    T1]  ret_from_fork+0x66/0x80
[   14.159060][    T1]  ret_from_fork_asm+0x11/0x20
[   14.159060][    T1] 
[   14.159060][    T1] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 6.8.0-rc5-syzkaller-gb401b621758e-dirty #0
[   14.159060][    T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
[   14.159060][    T1] =====================================================
[   14.159060][    T1] Disabling lock debugging due to kernel taint
[   14.159060][    T1] Kernel panic - not syncing: kmsan.panic set ...
[   14.159060][    T1] CPU: 1 PID: 1 Comm: swapper/0 Tainted: G    B              6.8.0-rc5-syzkaller-gb401b621758e-dirty #0
[   14.159060][    T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
[   14.159060][    T1] Call Trace:
[   14.159060][    T1]  <TASK>
[   14.159060][    T1]  dump_stack_lvl+0x1bf/0x240
[   14.159060][    T1]  dump_stack+0x1e/0x20
[   14.159060][    T1]  panic+0x4de/0xc90
[   14.159060][    T1]  kmsan_report+0x2d0/0x2d0
[   14.159060][    T1]  ? filter_irq_stacks+0x164/0x1a0
[   14.159060][    T1]  ? __msan_warning+0x96/0x110
[   14.159060][    T1]  ? __list_del_entry_valid_or_report+0x19e/0x490
[   14.159060][    T1]  ? stack_depot_save_flags+0x3e7/0x7b0
[   14.159060][    T1]  ? stack_depot_save+0x12/0x20
[   14.159060][    T1]  ? ref_tracker_alloc+0x215/0x700
[   14.159060][    T1]  ? linkwatch_fire_event+0x32b/0x6d0
[   14.159060][    T1]  ? netif_carrier_off+0xec/0x110
[   14.159060][    T1]  ? bond_create+0x19d/0x2a0
[   14.159060][    T1]  ? bonding_init+0x1a7/0x2d0
[   14.159060][    T1]  ? do_one_initcall+0x216/0x960
[   14.159060][    T1]  ? do_initcall_level+0x140/0x350
[   14.159060][    T1]  ? do_initcalls+0xf0/0x1d0
[   14.159060][    T1]  ? do_basic_setup+0x22/0x30
[   14.159060][    T1]  ? kernel_init_freeable+0x300/0x4b0
[   14.159060][    T1]  ? kernel_init+0x2f/0x7e0
[   14.159060][    T1]  ? ret_from_fork+0x66/0x80
[   14.159060][    T1]  ? ret_from_fork_asm+0x11/0x20
[   14.159060][    T1]  ? kmsan_get_shadow_origin_ptr+0x4d/0xa0
[   14.159060][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[   14.159060][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[   14.159060][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[   14.159060][    T1]  ? kmsan_get_shadow_origin_ptr+0x4d/0xa0
[   14.159060][    T1]  ? _raw_spin_lock_irqsave+0x35/0xc0
[   14.159060][    T1]  ? filter_irq_stacks+0x60/0x1a0
[   14.159060][    T1]  ? stack_depot_save_flags+0x2c/0x7b0
[   14.159060][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[   14.159060][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[   14.159060][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[   14.159060][    T1]  ? kmsan_get_shadow_origin_ptr+0x4d/0xa0
[   14.159060][    T1]  __msan_warning+0x96/0x110
[   14.159060][    T1]  __list_del_entry_valid_or_report+0x19e/0x490
[   14.159060][    T1]  stack_depot_save_flags+0x3e7/0x7b0
[   14.159060][    T1]  stack_depot_save+0x12/0x20
[   14.159060][    T1]  ref_tracker_alloc+0x215/0x700
[   14.159060][    T1]  ? linkwatch_fire_event+0x32b/0x6d0
[   14.159060][    T1]  ? netif_carrier_off+0xec/0x110
[   14.159060][    T1]  ? bond_create+0x19d/0x2a0
[   14.159060][    T1]  ? bonding_init+0x1a7/0x2d0
[   14.159060][    T1]  ? do_one_initcall+0x216/0x960
[   14.159060][    T1]  ? do_initcall_level+0x140/0x350
[   14.159060][    T1]  ? do_initcalls+0xf0/0x1d0
[   14.159060][    T1]  ? do_basic_setup+0x22/0x30
[   14.159060][    T1]  ? kernel_init_freeable+0x300/0x4b0
[   14.159060][    T1]  ? kernel_init+0x2f/0x7e0
[   14.159060][    T1]  ? ret_from_fork+0x66/0x80
[   14.159060][    T1]  ? ret_from_fork_asm+0x11/0x20
[   14.159060][    T1]  ? kmsan_internal_unpoison_memory+0x14/0x20
[   14.159060][    T1]  linkwatch_fire_event+0x32b/0x6d0
[   14.159060][    T1]  ? advisor_target_scan_time_store+0xe0/0x170
[   14.159060][    T1]  netif_carrier_off+0xec/0x110
[   14.159060][    T1]  bond_create+0x19d/0x2a0
[   14.159060][    T1]  bonding_init+0x1a7/0x2d0
[   14.159060][    T1]  ? spi_dln2_driver_init+0x40/0x40
[   14.159060][    T1]  do_one_initcall+0x216/0x960
[   14.159060][    T1]  ? spi_dln2_driver_init+0x40/0x40
[   14.159060][    T1]  ? kmsan_get_metadata+0xb0/0x1c0
[   14.159060][    T1]  ? kmsan_get_shadow_origin_ptr+0x4d/0xa0
[   14.159060][    T1]  ? filter_irq_stacks+0x164/0x1a0
[   14.159060][    T1]  ? stack_depot_save_flags+0x2c/0x7b0
[   14.159060][    T1]  ? skip_spaces+0x8f/0xc0
[   14.159060][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[   14.159060][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[   14.159060][    T1]  ? kmsan_get_shadow_origin_ptr+0x4d/0xa0
[   14.159060][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[   14.159060][    T1]  ? kmsan_get_shadow_origin_ptr+0x4d/0xa0
[   14.159060][    T1]  ? parse_args+0x1511/0x15e0
[   14.159060][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[   14.159060][    T1]  ? kmsan_get_shadow_origin_ptr+0x4d/0xa0
[   14.159060][    T1]  ? spi_dln2_driver_init+0x40/0x40
[   14.159060][    T1]  do_initcall_level+0x140/0x350
[   14.159060][    T1]  do_initcalls+0xf0/0x1d0
[   14.159060][    T1]  ? arch_cpuhp_init_parallel_bringup+0xe0/0xe0
[   14.159060][    T1]  do_basic_setup+0x22/0x30
[   14.159060][    T1]  kernel_init_freeable+0x300/0x4b0
[   14.159060][    T1]  ? rest_init+0x260/0x260
[   14.159060][    T1]  kernel_init+0x2f/0x7e0
[   14.159060][    T1]  ? rest_init+0x260/0x260
[   14.159060][    T1]  ret_from_fork+0x66/0x80
[   14.159060][    T1]  ? rest_init+0x260/0x260
[   14.159060][    T1]  ret_from_fork_asm+0x11/0x20
[   14.159060][    T1]  </TASK>
[   14.159060][    T1] Kernel Offset: disabled


syzkaller build log:
go env (err=<nil>)
GO111MODULE='auto'
GOARCH='amd64'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/syzkaller/jobs-2/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs-2/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.21.4'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/syzkaller/jobs-2/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build3485226163=/tmp/go-build -gno-record-gcc-switches'

git status (err=<nil>)
HEAD detached at 3222d10cb
nothing to commit, working tree clean


tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:32: run command via tools/syz-env for best compatibility, see:
Makefile:33: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' ./sys/syz-sysgen | grep -q false || go install ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=3222d10cbe77bbedb5a7c455e5bcb6b7081a63b7 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20231213-164354'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-fuzzer github.com/google/syzkaller/syz-fuzzer
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=3222d10cbe77bbedb5a7c455e5bcb6b7081a63b7 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20231213-164354'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=3222d10cbe77bbedb5a7c455e5bcb6b7081a63b7 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20231213-164354'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-stress github.com/google/syzkaller/tools/syz-stress
mkdir -p ./bin/linux_amd64
gcc -o ./bin/linux_amd64/syz-executor executor/executor.cc \
	-m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -fpermissive -w -DGOOS_linux=1 -DGOARCH_amd64=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"3222d10cbe77bbedb5a7c455e5bcb6b7081a63b7\"


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=1556f362180000


Tested on:

commit:         b401b621 Linux 6.8-rc5
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=d33318d4e4a0d226
dashboard link: https://syzkaller.appspot.com/bug?extid=34ad5fab48f7bf510349
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=127e7e94180000

Re: [syzbot] [net?] KMSAN: kernel-infoleak in __skb_datagram_iter (2)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+34ad5fab48f7bf510349@syzkaller.appspotmail.com

Tested on:

commit:         5bd7ef53 Merge tag 'pull-fixes' of git://git.kernel.or..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=109763d0180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f3f069371247b697
dashboard link: https://syzkaller.appspot.com/bug?extid=34ad5fab48f7bf510349
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1536f362180000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [net?] KMSAN: kernel-infoleak in __skb_datagram_iter (2)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+34ad5fab48f7bf510349@syzkaller.appspotmail.com

Tested on:

commit:         5bd7ef53 Merge tag 'pull-fixes' of git://git.kernel.or..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=127a98b4180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f3f069371247b697
dashboard link: https://syzkaller.appspot.com/bug?extid=34ad5fab48f7bf510349
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=127ab3f0180000

Note: testing is done by a robot and is best-effort only.