Artem Fetishev 70335abb26 fs/proc/base.c: fix GPF in /proc/$PID/map_files ...

The expected logic of proc_map_files_get_link() is either to return 0
and initialize 'path' or return an error and leave 'path' uninitialized.

By the time dname_to_vma_addr() returns 0 the corresponding vma may have
already be gone.  In this case the path is not initialized but the
return value is still 0.  This results in 'general protection fault'
inside d_path().

Steps to reproduce:

  CONFIG_CHECKPOINT_RESTORE=y

    fd = open(...);
    while (1) {
        mmap(fd, ...);
        munmap(fd, ...);
    }

  ls -la /proc/$PID/map_files

Addresses https://bugzilla.kernel.org/show_bug.cgi?id=68991

Signed-off-by: Artem Fetishev <[email protected]>
Signed-off-by: Aleksandr Terekhov <[email protected]>
Reported-by: <[email protected]>
Acked-by: Pavel Emelyanov <[email protected]>
Acked-by: Cyrill Gorcunov <[email protected]>
Reviewed-by: "Eric W. Biederman" <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

2014-03-10 17:26:20 -07:00

..

array.c

fs/proc/array.c: change do_task_stat() to use while_each_thread()

2014-01-23 16:37:02 -08:00

base.c

fs/proc/base.c: fix GPF in /proc/$PID/map_files

2014-03-10 17:26:20 -07:00

cmdline.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

consoles.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

cpuinfo.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

devices.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

fd.c

proc: make proc_fd_permission() thread-friendly

2013-09-11 15:59:03 -07:00

fd.h

…

generic.c

proc: set attributes of pde using accessor functions

2014-01-23 16:37:01 -08:00

inode.c

procfs: also fix proc_reg_get_unmapped_area() for !MMU case

2013-12-12 18:19:26 -08:00

internal.h

…

interrupts.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

Kconfig

kcore: add Kconfig help text

2013-11-13 12:09:33 +09:00

kcore.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

kmsg.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

loadavg.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

Makefile

…

meminfo.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

namespaces.c

consolidate simple ->d_delete() instances

2013-11-15 22:04:17 -05:00

nommu.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

page.c

mm: close PageTail race

2014-03-04 07:55:47 -08:00

proc_devtree.c

fs/proc/proc_devtree.c: remove empty /proc/device-tree when no openfirmware exists.

2014-01-23 16:37:01 -08:00

proc_net.c

…

proc_sysctl.c

…

proc_tty.c

…

root.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2013-09-07 14:35:32 -07:00

self.c

new helper: kfree_put_link()

2013-10-24 23:34:49 -04:00

softirqs.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

stat.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

task_mmu.c

seq_file: remove "%n" usage from seq_file users

2013-11-15 09:32:20 +09:00

task_nommu.c

seq_file: remove "%n" usage from seq_file users

2013-11-15 09:32:20 +09:00

uptime.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

version.c

fs/proc: don't use module_init for non-modular core code

2014-01-23 16:37:02 -08:00

vmcore.c

vmcore: prevent PT_NOTE p_memsz overflow during header update

2014-02-10 16:01:40 -08:00