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Sat, 15 Feb 2025 07:14:01 -0800 (PST) Date: Sat, 15 Feb 2025 07:14:01 -0800 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67b0af39.050a0220.6f0b7.000d.GAE@google.com> Subject: Re: [syzbot] [ppp?] KMSAN: uninit-value in ppp_sync_send (2) From: syzbot To: linux-kernel@vger.kernel.org, purvayeshi550@gmail.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KMSAN: uninit-value in ppp_sync_send ===================================================== BUG: KMSAN: uninit-value in ppp_sync_txmunge drivers/net/ppp/ppp_synctty.c:521 [inline] BUG: KMSAN: uninit-value in ppp_sync_send+0x2dc/0xc60 drivers/net/ppp/ppp_synctty.c:573 ppp_sync_txmunge drivers/net/ppp/ppp_synctty.c:521 [inline] ppp_sync_send+0x2dc/0xc60 drivers/net/ppp/ppp_synctty.c:573 ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2280 [inline] ppp_input+0x1f1/0xe60 drivers/net/ppp/ppp_generic.c:2304 pppoe_rcv_core+0x1d3/0x720 drivers/net/ppp/pppoe.c:379 sk_backlog_rcv+0x13b/0x420 include/net/sock.h:1122 __release_sock+0x1da/0x330 net/core/sock.c:3106 release_sock+0x6b/0x250 net/core/sock.c:3660 pppoe_sendmsg+0xb35/0xc50 drivers/net/ppp/pppoe.c:903 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg+0x30f/0x380 net/socket.c:733 ____sys_sendmsg+0x903/0xb60 net/socket.c:2573 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2627 __sys_sendmmsg+0x2ff/0x880 net/socket.c:2716 __do_sys_sendmmsg net/socket.c:2743 [inline] __se_sys_sendmmsg net/socket.c:2740 [inline] __x64_sys_sendmmsg+0xbc/0x120 net/socket.c:2740 x64_sys_call+0x33c2/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:308 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: __alloc_frozen_pages_noprof+0x9a7/0xe00 mm/page_alloc.c:4762 __alloc_pages_noprof+0x41/0xd0 mm/page_alloc.c:4773 __page_frag_cache_refill+0x51/0x200 mm/page_frag_cache.c:59 __page_frag_alloc_align+0xc9/0x630 mm/page_frag_cache.c:103 page_frag_alloc include/linux/page_frag_cache.h:56 [inline] __netdev_alloc_skb+0x6ab/0x720 net/core/skbuff.c:762 netdev_alloc_skb include/linux/skbuff.h:3410 [inline] dev_alloc_skb include/linux/skbuff.h:3423 [inline] ppp_sync_txmunge drivers/net/ppp/ppp_synctty.c:508 [inline] ppp_sync_send+0xf1/0xc60 drivers/net/ppp/ppp_synctty.c:573 ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2280 [inline] ppp_input+0x1f1/0xe60 drivers/net/ppp/ppp_generic.c:2304 pppoe_rcv_core+0x1d3/0x720 drivers/net/ppp/pppoe.c:379 sk_backlog_rcv+0x13b/0x420 include/net/sock.h:1122 __release_sock+0x1da/0x330 net/core/sock.c:3106 release_sock+0x6b/0x250 net/core/sock.c:3660 pppoe_sendmsg+0xb35/0xc50 drivers/net/ppp/pppoe.c:903 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg+0x30f/0x380 net/socket.c:733 ____sys_sendmsg+0x903/0xb60 net/socket.c:2573 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2627 __sys_sendmmsg+0x2ff/0x880 net/socket.c:2716 __do_sys_sendmmsg net/socket.c:2743 [inline] __se_sys_sendmmsg net/socket.c:2740 [inline] __x64_sys_sendmmsg+0xbc/0x120 net/socket.c:2740 x64_sys_call+0x33c2/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:308 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 1 UID: 0 PID: 6764 Comm: syz.0.16 Not tainted 6.14.0-rc2-syzkaller-00259-g7ff71e6d9239-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 ===================================================== Tested on: commit: 7ff71e6d Merge tag 'alpha-fixes-v6.14-rc2' of git://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=167c59a4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=92e8820bdc5f2bf2 dashboard link: https://syzkaller.appspot.com/bug?extid=29fc8991b0ecb186cf40 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=154ee7df980000