diff options
| author |   Lin Feng <linf@wangsu.com> | 2021-02-25 17:20:53 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2021-02-26 09:41:03 -0800 |
| commit | 3b3376f222e3ab58367d9dd405cafd09d5e37b7c (patch) | |
| tree | dbe1cb937b2b318e6460f484fcb203a8344f9426 /samples | |
| parent | proc: use kvzalloc for our kernel buffer (diff) | |
| download | linux-dev-3b3376f222e3ab58367d9dd405cafd09d5e37b7c.tar.xz linux-dev-3b3376f222e3ab58367d9dd405cafd09d5e37b7c.zip | |
sysctl.c: fix underflow value setting risk in vm_table
Apart from subsystem specific .proc_handler handler, all ctl_tables with
extra1 and extra2 members set should use proc_dointvec_minmax instead of
proc_dointvec, or the limit set in extra* never work and potentially echo
underflow values(negative numbers) is likely make system unstable.
Especially vfs_cache_pressure and zone_reclaim_mode, -1 is apparently not
a valid value, but we can set to them. And then kernel may crash.
# echo -1 > /proc/sys/vm/vfs_cache_pressure
Link: https://lkml.kernel.org/r/20201223105535.2875-1-linf@wangsu.com
Signed-off-by: Lin Feng <linf@wangsu.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'samples')
0 files changed, 0 insertions, 0 deletions