a7y18lte-ubports/android_kernel_samsung_a7y18lte
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
b5362612ee
android_kernel_samsung_a7y1.../fs/proc
History
Alexey Dobriyan b5362612ee proc: fix coredump vs read /proc/*/stat race 
commit 8bb2ee192e482c5d500df9f2b1b26a560bd3026f upstream.

do_task_stat() accesses IP and SP of a task without bumping reference
count of a stack (which became an entity with independent lifetime at
some point).

Steps to reproduce:

    #include <stdio.h>
    #include <sys/types.h>
    #include <sys/stat.h>
    #include <fcntl.h>
    #include <sys/time.h>
    #include <sys/resource.h>
    #include <unistd.h>
    #include <sys/wait.h>

    int main(void)
    {
    	setrlimit(RLIMIT_CORE, &(struct rlimit){});

    	while (1) {
    		char buf[64];
    		char buf2[4096];
    		pid_t pid;
    		int fd;

    		pid = fork();
    		if (pid == 0) {
    			*(volatile int *)0 = 0;
    		}

    		snprintf(buf, sizeof(buf), "/proc/%u/stat", pid);
    		fd = open(buf, O_RDONLY);
    		read(fd, buf2, sizeof(buf2));
    		close(fd);

    		waitpid(pid, NULL, 0);
    	}
    	return 0;
    }

    BUG: unable to handle kernel paging request at 0000000000003fd8
    IP: do_task_stat+0x8b4/0xaf0
    PGD 800000003d73e067 P4D 800000003d73e067 PUD 3d558067 PMD 0
    Oops: 0000 [#1] PREEMPT SMP PTI
    CPU: 0 PID: 1417 Comm: a.out Not tainted 4.15.0-rc8-dirty #2
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1.fc27 04/01/2014
    RIP: 0010:do_task_stat+0x8b4/0xaf0
    Call Trace:
     proc_single_show+0x43/0x70
     seq_read+0xe6/0x3b0
     __vfs_read+0x1e/0x120
     vfs_read+0x84/0x110
     SyS_read+0x3d/0xa0
     entry_SYSCALL_64_fastpath+0x13/0x6c
    RIP: 0033:0x7f4d7928cba0
    RSP: 002b:00007ffddb245158 EFLAGS: 00000246
    Code: 03 b7 a0 01 00 00 4c 8b 4c 24 70 4c 8b 44 24 78 4c 89 74 24 18 e9 91 f9 ff ff f6 45 4d 02 0f 84 fd f7 ff ff 48 8b 45 40 48 89 ef <48> 8b 80 d8 3f 00 00 48 89 44 24 20 e8 9b 97 eb ff 48 89 44 24
    RIP: do_task_stat+0x8b4/0xaf0 RSP: ffffc90000607cc8
    CR2: 0000000000003fd8

John Ogness said: for my tests I added an else case to verify that the
race is hit and correctly mitigated.

Link: http://lkml.kernel.org/r/20180116175054.GA11513@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reported-by: "Kohli, Gaurav" <gkohli@codeaurora.org>
Tested-by: John Ogness <john.ogness@linutronix.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: zhangyi (F) <yi.zhang@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-04-07 13:06:14 +02:00
..
array.c proc: fix coredump vs read /proc/*/stat race 2020-04-07 13:06:14 +02:00
base.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
cmdline.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
consoles.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
cpuinfo.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
devices.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
fd.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
fd.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
fslog.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
generic.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
inode.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
internal.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
interrupts.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
Kconfig A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
kcore.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
kmsg.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
loadavg.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
Makefile A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
meminfo.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
namespaces.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
nommu.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
page.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
proc_net.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
proc_sysctl.c fs/proc/proc_sysctl.c: Fix a NULL pointer dereference 2020-04-06 16:40:32 +02:00
proc_tty.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
root.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
self.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
softirqs.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
stat.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
task_mmu.c Revert "coredump: fix race condition between mmget_not_zero()/get_task_mm() and core dumping" 2020-04-06 22:47:46 +05:30
task_nommu.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
thread_self.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
uid.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
uptime.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
version.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
vmcore.c proc/vmcore: Fix i386 build error of missing copy_oldmem_page_encrypted() 2020-04-07 12:33:05 +02:00