From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Miles Chen <miles.chen@mediatek.com>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH 3.18 54/90] tty: check name length in tty_find_polling_driver()
Date: Mon, 19 Nov 2018 17:29:36 +0100 [thread overview]
Message-ID: <20181119162629.542049061@linuxfoundation.org> (raw)
In-Reply-To: <20181119162620.585061184@linuxfoundation.org>
3.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Miles Chen <miles.chen@mediatek.com>
[ Upstream commit 33a1a7be198657c8ca26ad406c4d2a89b7162bcc ]
The issue is found by a fuzzing test.
If tty_find_polling_driver() recevies an incorrect input such as
',,' or '0b', the len becomes 0 and strncmp() always return 0.
In this case, a null p->ops->poll_init() is called and it causes a kernel
panic.
Fix this by checking name length against zero in tty_find_polling_driver().
$echo ,, > /sys/module/kgdboc/parameters/kgdboc
[ 20.804451] WARNING: CPU: 1 PID: 104 at drivers/tty/serial/serial_core.c:457
uart_get_baud_rate+0xe8/0x190
[ 20.804917] Modules linked in:
[ 20.805317] CPU: 1 PID: 104 Comm: sh Not tainted 4.19.0-rc7ajb #8
[ 20.805469] Hardware name: linux,dummy-virt (DT)
[ 20.805732] pstate: 20000005 (nzCv daif -PAN -UAO)
[ 20.805895] pc : uart_get_baud_rate+0xe8/0x190
[ 20.806042] lr : uart_get_baud_rate+0xc0/0x190
[ 20.806476] sp : ffffffc06acff940
[ 20.806676] x29: ffffffc06acff940 x28: 0000000000002580
[ 20.806977] x27: 0000000000009600 x26: 0000000000009600
[ 20.807231] x25: ffffffc06acffad0 x24: 00000000ffffeff0
[ 20.807576] x23: 0000000000000001 x22: 0000000000000000
[ 20.807807] x21: 0000000000000001 x20: 0000000000000000
[ 20.808049] x19: ffffffc06acffac8 x18: 0000000000000000
[ 20.808277] x17: 0000000000000000 x16: 0000000000000000
[ 20.808520] x15: ffffffffffffffff x14: ffffffff00000000
[ 20.808757] x13: ffffffffffffffff x12: 0000000000000001
[ 20.809011] x11: 0101010101010101 x10: ffffff880d59ff5f
[ 20.809292] x9 : ffffff880d59ff5e x8 : ffffffc06acffaf3
[ 20.809549] x7 : 0000000000000000 x6 : ffffff880d59ff5f
[ 20.809803] x5 : 0000000080008001 x4 : 0000000000000003
[ 20.810056] x3 : ffffff900853e6b4 x2 : dfffff9000000000
[ 20.810693] x1 : ffffffc06acffad0 x0 : 0000000000000cb0
[ 20.811005] Call trace:
[ 20.811214] uart_get_baud_rate+0xe8/0x190
[ 20.811479] serial8250_do_set_termios+0xe0/0x6f4
[ 20.811719] serial8250_set_termios+0x48/0x54
[ 20.811928] uart_set_options+0x138/0x1bc
[ 20.812129] uart_poll_init+0x114/0x16c
[ 20.812330] tty_find_polling_driver+0x158/0x200
[ 20.812545] configure_kgdboc+0xbc/0x1bc
[ 20.812745] param_set_kgdboc_var+0xb8/0x150
[ 20.812960] param_attr_store+0xbc/0x150
[ 20.813160] module_attr_store+0x40/0x58
[ 20.813364] sysfs_kf_write+0x8c/0xa8
[ 20.813563] kernfs_fop_write+0x154/0x290
[ 20.813764] vfs_write+0xf0/0x278
[ 20.813951] __arm64_sys_write+0x84/0xf4
[ 20.814400] el0_svc_common+0xf4/0x1dc
[ 20.814616] el0_svc_handler+0x98/0xbc
[ 20.814804] el0_svc+0x8/0xc
[ 20.822005] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
[ 20.826913] Mem abort info:
[ 20.827103] ESR = 0x84000006
[ 20.827352] Exception class = IABT (current EL), IL = 16 bits
[ 20.827655] SET = 0, FnV = 0
[ 20.827855] EA = 0, S1PTW = 0
[ 20.828135] user pgtable: 4k pages, 39-bit VAs, pgdp = (____ptrval____)
[ 20.828484] [0000000000000000] pgd=00000000aadee003, pud=00000000aadee003, pmd=0000000000000000
[ 20.829195] Internal error: Oops: 84000006 [#1] SMP
[ 20.829564] Modules linked in:
[ 20.829890] CPU: 1 PID: 104 Comm: sh Tainted: G W 4.19.0-rc7ajb #8
[ 20.830545] Hardware name: linux,dummy-virt (DT)
[ 20.830829] pstate: 60000085 (nZCv daIf -PAN -UAO)
[ 20.831174] pc : (null)
[ 20.831457] lr : serial8250_do_set_termios+0x358/0x6f4
[ 20.831727] sp : ffffffc06acff9b0
[ 20.831936] x29: ffffffc06acff9b0 x28: ffffff9008d7c000
[ 20.832267] x27: ffffff900969e16f x26: 0000000000000000
[ 20.832589] x25: ffffff900969dfb0 x24: 0000000000000000
[ 20.832906] x23: ffffffc06acffad0 x22: ffffff900969e160
[ 20.833232] x21: 0000000000000000 x20: ffffffc06acffac8
[ 20.833559] x19: ffffff900969df90 x18: 0000000000000000
[ 20.833878] x17: 0000000000000000 x16: 0000000000000000
[ 20.834491] x15: ffffffffffffffff x14: ffffffff00000000
[ 20.834821] x13: ffffffffffffffff x12: 0000000000000001
[ 20.835143] x11: 0101010101010101 x10: ffffff880d59ff5f
[ 20.835467] x9 : ffffff880d59ff5e x8 : ffffffc06acffaf3
[ 20.835790] x7 : 0000000000000000 x6 : ffffff880d59ff5f
[ 20.836111] x5 : c06419717c314100 x4 : 0000000000000007
[ 20.836419] x3 : 0000000000000000 x2 : 0000000000000000
[ 20.836732] x1 : 0000000000000001 x0 : ffffff900969df90
[ 20.837100] Process sh (pid: 104, stack limit = 0x(____ptrval____))
[ 20.837396] Call trace:
[ 20.837566] (null)
[ 20.837816] serial8250_set_termios+0x48/0x54
[ 20.838089] uart_set_options+0x138/0x1bc
[ 20.838570] uart_poll_init+0x114/0x16c
[ 20.838834] tty_find_polling_driver+0x158/0x200
[ 20.839119] configure_kgdboc+0xbc/0x1bc
[ 20.839380] param_set_kgdboc_var+0xb8/0x150
[ 20.839658] param_attr_store+0xbc/0x150
[ 20.839920] module_attr_store+0x40/0x58
[ 20.840183] sysfs_kf_write+0x8c/0xa8
[ 20.840183] sysfs_kf_write+0x8c/0xa8
[ 20.840440] kernfs_fop_write+0x154/0x290
[ 20.840702] vfs_write+0xf0/0x278
[ 20.840942] __arm64_sys_write+0x84/0xf4
[ 20.841209] el0_svc_common+0xf4/0x1dc
[ 20.841471] el0_svc_handler+0x98/0xbc
[ 20.841713] el0_svc+0x8/0xc
[ 20.842057] Code: bad PC value
[ 20.842764] ---[ end trace a8835d7de79aaadf ]---
[ 20.843134] Kernel panic - not syncing: Fatal exception
[ 20.843515] SMP: stopping secondary CPUs
[ 20.844289] Kernel Offset: disabled
[ 20.844634] CPU features: 0x0,21806002
[ 20.844857] Memory Limit: none
[ 20.845172] ---[ end Kernel panic - not syncing: Fatal exception ]---
Signed-off-by: Miles Chen <miles.chen@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/tty/tty_io.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -357,7 +357,7 @@ struct tty_driver *tty_find_polling_driv
mutex_lock(&tty_mutex);
/* Search through the tty devices to look for a match */
list_for_each_entry(p, &tty_drivers, tty_drivers) {
- if (strncmp(name, p->name, len) != 0)
+ if (!len || strncmp(name, p->name, len) != 0)
continue;
stp = str;
if (*stp == ',')
next prev parent reply other threads:[~2018-11-19 17:05 UTC|newest]
Thread overview: 103+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-19 16:28 [PATCH 3.18 00/90] 3.18.126-stable review Greg Kroah-Hartman
2018-11-19 16:28 ` [PATCH 3.18 01/90] bcache: fix miss key refill->end in writeback Greg Kroah-Hartman
2018-11-19 16:28 ` [PATCH 3.18 02/90] jffs2: free jffs2_sb_info through jffs2_kill_sb() Greg Kroah-Hartman
2018-11-19 16:28 ` [PATCH 3.18 03/90] pcmcia: Implement CLKRUN protocol disabling for Ricoh bridges Greg Kroah-Hartman
2018-11-19 16:28 ` [PATCH 3.18 04/90] ALSA: ca0106: Disable IZD on SB0570 DAC to fix audio pops Greg Kroah-Hartman
2018-11-19 16:28 ` [PATCH 3.18 05/90] x86/corruption-check: Fix panic in memory_corruption_check() when boot option without value is provided Greg Kroah-Hartman
2018-11-19 16:28 ` [PATCH 3.18 06/90] sparc: Fix single-pcr perf event counter management Greg Kroah-Hartman
2018-11-19 16:28 ` [PATCH 3.18 07/90] sparc: Throttle perf events properly Greg Kroah-Hartman
2018-11-19 16:28 ` [PATCH 3.18 08/90] net: qla3xxx: Remove overflowing shift statement Greg Kroah-Hartman
2018-11-19 16:28 ` [PATCH 3.18 09/90] selftests: ftrace: Add synthetic event syntax testcase Greg Kroah-Hartman
2018-11-19 16:28 ` [PATCH 3.18 10/90] locking/lockdep: Fix debug_locks off performance problem Greg Kroah-Hartman
2018-11-19 16:28 ` [PATCH 3.18 11/90] ataflop: fix error handling during setup Greg Kroah-Hartman
2018-11-19 16:28 ` [PATCH 3.18 12/90] swim: fix cleanup on setup error Greg Kroah-Hartman
2018-11-19 16:28 ` [PATCH 3.18 13/90] tun: Consistently configure generic netdev params via rtnetlink Greg Kroah-Hartman
2018-11-19 16:28 ` [PATCH 3.18 14/90] perf tools: Free temporary sys string in read_event_files() Greg Kroah-Hartman
2018-11-19 16:28 ` [PATCH 3.18 15/90] perf tools: Cleanup trace-event-info tdata leak Greg Kroah-Hartman
2018-11-19 16:28 ` [PATCH 3.18 16/90] cpupower: Fix coredump on VMWare Greg Kroah-Hartman
2018-11-19 18:11 ` Prarit Bhargava
2018-11-20 8:49 ` Greg Kroah-Hartman
2018-11-19 16:28 ` [PATCH 3.18 17/90] mmc: sdhci-pci-o2micro: Add quirk for O2 Micro dev 0x8620 rev 0x01 Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 18/90] x86/olpc: Indicate that legacy PC XO-1 platform should not register RTC Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 19/90] x86: boot: Fix EFI stub alignment Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 20/90] kprobes: Return error if we fail to reuse kprobe instead of BUG_ON() Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 21/90] ath10k: schedule hardware restart if WMI command times out Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 22/90] scsi: esp_scsi: Track residual for PIO transfers Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 23/90] ext4: fix argument checking in EXT4_IOC_MOVE_EXT Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 24/90] usb: chipidea: Prevent unbalanced IRQ disable Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 25/90] uio: ensure class is registered before devices Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 26/90] scsi: lpfc: Correct soft lockup when running mds diagnostics Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 27/90] signal: Always deliver the kernels SIGKILL and SIGSTOP to a pid namespace init Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 28/90] net/ipv4: defensive cipso option parsing Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 29/90] jbd2: fix use after free in jbd2_log_do_checkpoint() Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 30/90] gfs2_meta: ->mount() can get NULL dev_name Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 31/90] ext4: initialize retries variable in ext4_da_write_inline_data_begin() Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 32/90] signal/GenWQE: Fix sending of SIGKILL Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 33/90] crypto: lrw - Fix out-of bounds access on counter overflow Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 34/90] ima: fix showing large violations or runtime_measurements_count Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 35/90] kbuild: fix kernel/bounds.c W=1 warning Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 36/90] iio: adc: at91: fix acking DRDY irq on simple conversions Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 37/90] iio: adc: at91: fix wrong channel number in triggered buffer mode Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 38/90] w1: omap-hdq: fix missing bus unregister at removal Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 39/90] smb3: allow stats which track session and share reconnects to be reset Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 40/90] smb3: do not attempt cifs operation in smb3 query info error path Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 41/90] smb3: on kerberos mount if server doesnt specify auth type use krb5 Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 42/90] printk: Fix panic caused by passing log_buf_len to command line Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 43/90] NFSv4.1: Fix the r/wsize checking Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 44/90] nfsd: Fix an Oops in free_session() Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 45/90] lockd: fix access beyond unterminated strings in prints Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 46/90] dm ioctl: harden copy_params()s copy_from_user() from malicious users Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 47/90] TC: Set DMA masks for devices Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 48/90] kgdboc: Passing ekgdboc to command line causes panic Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 49/90] media: em28xx: use a default format if TRY_FMT fails Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 50/90] media: em28xx: fix input name for Terratec AV 350 Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 51/90] media: em28xx: make v4l2-compliance happier by starting sequence on zero Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 52/90] Cramfs: fix abad comparison when wrap-arounds occur Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 53/90] dm: remove duplicate dm_get_live_table() in __dm_destroy() Greg Kroah-Hartman
2018-11-19 16:29 ` Greg Kroah-Hartman [this message]
2018-11-19 16:29 ` [PATCH 3.18 55/90] powerpc/nohash: fix undefined behaviour when testing page size support Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 56/90] drm/omap: fix memory barrier bug in DMM driver Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 57/90] media: pci: cx23885: handle adding to list failure Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 58/90] MIPS: kexec: Mark CPU offline before disabling local IRQ Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 59/90] powerpc/boot: Ensure _zimage_start is a weak symbol Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 60/90] media: tvp5150: fix width alignment during set_selection() Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 61/90] 9p: clear dangling pointers in p9stat_free Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 62/90] cdrom: fix improper type cast, which can leat to information leak Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 63/90] xtensa: fix boot parameters address translation Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 64/90] clk: s2mps11: Fix matching when built as module and DT node contains compatible Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 65/90] libceph: bump CEPH_MSG_MAX_DATA_LEN Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 66/90] mach64: fix display corruption on big endian machines Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 67/90] mach64: fix image corruption due to reading accelerator registers Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 68/90] ocfs2: fix a misuse a of brelse after failing ocfs2_check_dir_entry Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 69/90] mtd: docg3: dont set conflicting BCH_CONST_PARAMS option Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 70/90] termios, tty/tty_baudrate.c: fix buffer overrun Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 71/90] arch/alpha, termios: implement BOTHER, IBSHIFT and termios2 Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 72/90] ext4: add missing brelse() update_backups()s error path Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 73/90] ext4: add missing brelse() in set_flexbg_block_bitmap()s " Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 74/90] ext4: add missing brelse() add_new_gdb_meta_bg()s " Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 75/90] ext4: avoid potential extra brelse in setup_new_flex_group_blocks() Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 76/90] ext4: fix possible inode leak in the retry loop of ext4_resize_fs() Greg Kroah-Hartman
2018-11-19 16:29 ` [PATCH 3.18 77/90] ext4: avoid buffer leak in ext4_orphan_add() after prior errors Greg Kroah-Hartman
2018-11-19 16:30 ` [PATCH 3.18 78/90] ext4: fix missing cleanup if ext4_alloc_flex_bg_array() fails while resizing Greg Kroah-Hartman
2018-11-19 16:30 ` [PATCH 3.18 79/90] ext4: avoid possible double brelse() in add_new_gdb() on error path Greg Kroah-Hartman
2018-11-19 16:30 ` [PATCH 3.18 80/90] ext4: fix possible leak of sbi->s_group_desc_leak in " Greg Kroah-Hartman
2018-11-19 16:30 ` [PATCH 3.18 81/90] ext4: release bs.bh before re-using in ext4_xattr_block_find() Greg Kroah-Hartman
2018-11-19 16:30 ` [PATCH 3.18 82/90] ext4: fix buffer leak in ext4_xattr_move_to_block() on error path Greg Kroah-Hartman
2018-11-19 16:30 ` [PATCH 3.18 83/90] ext4: fix buffer leak in __ext4_read_dirblock() " Greg Kroah-Hartman
2018-11-19 16:30 ` [PATCH 3.18 84/90] mount: Retest MNT_LOCKED in do_umount Greg Kroah-Hartman
2018-11-19 16:30 ` [PATCH 3.18 85/90] mount: Dont allow copying MNT_UNBINDABLE|MNT_LOCKED mounts Greg Kroah-Hartman
2018-11-19 16:30 ` [PATCH 3.18 86/90] mount: Prevent MNT_DETACH from disconnecting locked mounts Greg Kroah-Hartman
2018-11-19 16:30 ` [PATCH 3.18 87/90] sunrpc: correct the computation for page_ptr when truncating Greg Kroah-Hartman
2018-11-19 16:30 ` [PATCH 3.18 88/90] fuse: fix leaked notify reply Greg Kroah-Hartman
2018-11-19 16:30 ` [PATCH 3.18 89/90] configfs: replace strncpy with memcpy Greg Kroah-Hartman
2018-11-19 16:30 ` [PATCH 3.18 90/90] hugetlbfs: fix kernel BUG at fs/hugetlbfs/inode.c:444! Greg Kroah-Hartman
2018-11-20 0:09 ` [PATCH 3.18 00/90] 3.18.126-stable review shuah
2018-11-20 7:49 ` Greg Kroah-Hartman
2018-11-20 10:39 ` Harsh Shandilya
2018-11-20 11:16 ` Greg Kroah-Hartman
[not found] ` <D161C16F-60D6-4C60-B065-C780BD3DCF55@prjkt.io>
2018-11-20 16:40 ` Greg Kroah-Hartman
2018-11-20 16:58 ` Guenter Roeck
2018-11-20 20:38 ` Guenter Roeck
2018-11-21 10:37 ` Greg Kroah-Hartman
2018-11-21 23:40 ` Guenter Roeck
2018-11-22 6:30 ` Greg Kroah-Hartman
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