This is a note to let you know that I've just added the patch titled

tty/vt: fix write/write race in ioctl(KDSKBSENT) handler

to my tty git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git in the tty-testing branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will be merged to the tty-next branch sometime soon, after it passes testing, and the merge window is open.

If you have any questions about this process, please let me know.

From 46ca3f735f345c9d87383dd3a09fa5d43870770e Mon Sep 17 00:00:00 2001

From: Sergei Trofimovich slyfox@gentoo.org Date: Sun, 10 Mar 2019 21:24:15 +0000 Subject: tty/vt: fix write/write race in ioctl(KDSKBSENT) handler

The bug manifests as an attempt to access deallocated memory:

BUG: unable to handle kernel paging request at ffff9c8735448000 #PF error: [PROT] [WRITE] PGD 288a05067 P4D 288a05067 PUD 288a07067 PMD 7f60c2063 PTE 80000007f5448161 Oops: 0003 [#1] PREEMPT SMP CPU: 6 PID: 388 Comm: loadkeys Tainted: G C 5.0.0-rc6-00153-g5ded5871030e #91 Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./H77M-D3H, BIOS F12 11/14/2013 RIP: 0010:__memmove+0x81/0x1a0 Code: 4c 89 4f 10 4c 89 47 18 48 8d 7f 20 73 d4 48 83 c2 20 e9 a2 00 00 00 66 90 48 89 d1 4c 8b 5c 16 f8 4c 8d 54 17 f8 48 c1 e9 03 <f3> 48 a5 4d 89 1a e9 0c 01 00 00 0f 1f 40 00 48 89 d1 4c 8b 1e 49 RSP: 0018:ffffa1b9002d7d08 EFLAGS: 00010203 RAX: ffff9c873541af43 RBX: ffff9c873541af43 RCX: 00000c6f105cd6bf RDX: 0000637882e986b6 RSI: ffff9c8735447ffb RDI: ffff9c8735447ffb RBP: ffff9c8739cd3800 R08: ffff9c873b802f00 R09: 00000000fffff73b R10: ffffffffb82b35f1 R11: 00505b1b004d5b1b R12: 0000000000000000 R13: ffff9c873541af3d R14: 000000000000000b R15: 000000000000000c FS: 00007f450c390580(0000) GS:ffff9c873f180000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff9c8735448000 CR3: 00000007e213c002 CR4: 00000000000606e0 Call Trace: vt_do_kdgkb_ioctl+0x34d/0x440 vt_ioctl+0xba3/0x1190 ? __bpf_prog_run32+0x39/0x60 ? mem_cgroup_commit_charge+0x7b/0x4e0 tty_ioctl+0x23f/0x920 ? preempt_count_sub+0x98/0xe0 ? __seccomp_filter+0x67/0x600 do_vfs_ioctl+0xa2/0x6a0 ? syscall_trace_enter+0x192/0x2d0 ksys_ioctl+0x3a/0x70 __x64_sys_ioctl+0x16/0x20 do_syscall_64+0x54/0xe0 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The bug manifests on systemd systems with multiple vtcon devices: # cat /sys/devices/virtual/vtconsole/vtcon0/name (S) dummy device # cat /sys/devices/virtual/vtconsole/vtcon1/name (M) frame buffer device

There systemd runs 'loadkeys' tool in tapallel for each vtcon instance. This causes two parallel ioctl(KDSKBSENT) calls to race into adding the same entry into 'func_table' array at:

drivers/tty/vt/keyboard.c:vt_do_kdgkb_ioctl()

The function has no locking around writes to 'func_table'.

The simplest reproducer is to have initrams with the following init on a 8-CPU machine x86_64:

#!/bin/sh

loadkeys -q windowkeys ru4 & loadkeys -q windowkeys ru4 & loadkeys -q windowkeys ru4 & loadkeys -q windowkeys ru4 &

loadkeys -q windowkeys ru4 & loadkeys -q windowkeys ru4 & loadkeys -q windowkeys ru4 & loadkeys -q windowkeys ru4 & wait

The change adds lock on write path only. Reads are still racy.

CC: Greg Kroah-Hartman gregkh@linuxfoundation.org CC: Jiri Slaby jslaby@suse.com Link: https://lkml.org/lkml/2019/2/17/256 Signed-off-by: Sergei Trofimovich slyfox@gentoo.org Cc: stable stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/vt/keyboard.c | 33 +++++++++++++++++++++++++++------ 1 file changed, 27 insertions(+), 6 deletions(-)

diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c index 88312c6c92cc..0617e87ab343 100644 --- a/drivers/tty/vt/keyboard.c +++ b/drivers/tty/vt/keyboard.c @@ -123,6 +123,7 @@ static const int NR_TYPES = ARRAY_SIZE(max_vals); static struct input_handler kbd_handler; static DEFINE_SPINLOCK(kbd_event_lock); static DEFINE_SPINLOCK(led_lock); +static DEFINE_SPINLOCK(func_buf_lock); /* guard 'func_buf' and friends */ static unsigned long key_down[BITS_TO_LONGS(KEY_CNT)]; /* keyboard key bitmap */ static unsigned char shift_down[NR_SHIFT]; /* shift state counters.. */ static bool dead_key_next; @@ -1990,11 +1991,12 @@ int vt_do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm) char *p; u_char *q; u_char __user *up; - int sz; + int sz, fnw_sz; int delta; char *first_free, *fj, *fnw; int i, j, k; int ret; + unsigned long flags;

if (!capable(CAP_SYS_TTY_CONFIG)) perm = 0; @@ -2037,7 +2039,14 @@ int vt_do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm) goto reterr; }

+ fnw = NULL; + fnw_sz = 0; + /* race aginst other writers */ + again: + spin_lock_irqsave(&func_buf_lock, flags); q = func_table[i]; + + /* fj pointer to next entry after 'q' */ first_free = funcbufptr + (funcbufsize - funcbufleft); for (j = i+1; j < MAX_NR_FUNC && !func_table[j]; j++) ; @@ -2045,10 +2054,12 @@ int vt_do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm) fj = func_table[j]; else fj = first_free; - + /* buffer usage increase by new entry */ delta = (q ? -strlen(q) : 1) + strlen(kbs->kb_string); + if (delta <= funcbufleft) { /* it fits in current buf */ if (j < MAX_NR_FUNC) { + /* make enough space for new entry at 'fj' */ memmove(fj + delta, fj, first_free - fj); for (k = j; k < MAX_NR_FUNC; k++) if (func_table[k]) @@ -2061,20 +2072,28 @@ int vt_do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm) sz = 256; while (sz < funcbufsize - funcbufleft + delta) sz <<= 1; - fnw = kmalloc(sz, GFP_KERNEL); - if(!fnw) { - ret = -ENOMEM; - goto reterr; + if (fnw_sz != sz) { + spin_unlock_irqrestore(&func_buf_lock, flags); + kfree(fnw); + fnw = kmalloc(sz, GFP_KERNEL); + fnw_sz = sz; + if (!fnw) { + ret = -ENOMEM; + goto reterr; + } + goto again; }

if (!q) func_table[i] = fj; + /* copy data before insertion point to new location */ if (fj > funcbufptr) memmove(fnw, funcbufptr, fj - funcbufptr); for (k = 0; k < j; k++) if (func_table[k]) func_table[k] = fnw + (func_table[k] - funcbufptr);

+ /* copy data after insertion point to new location */ if (first_free > fj) { memmove(fnw + (fj - funcbufptr) + delta, fj, first_free - fj); for (k = j; k < MAX_NR_FUNC; k++) @@ -2087,7 +2106,9 @@ int vt_do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm) funcbufleft = funcbufleft - delta + sz - funcbufsize; funcbufsize = sz; } + /* finally insert item itself */ strcpy(func_table[i], kbs->kb_string); + spin_unlock_irqrestore(&func_buf_lock, flags); break; } ret = 0;