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| author | Rafael Aquini <aquini@redhat.com> | 2020-06-08 06:40:51 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-08 20:05:56 +0200 |
| commit | e77132e75845470065768e2205727e6be52cb7f4 (patch) | |
| tree | dd222e1900ff7b29db7f001e1a4fcb353a9935cc /arch/powerpc/perf/callchain_64.c | |
| parent | panic: add sysctl to dump all CPUs backtraces on oops event (diff) | |
| download | linux-e77132e75845470065768e2205727e6be52cb7f4.tar.xz linux-e77132e75845470065768e2205727e6be52cb7f4.zip | |
kernel/sysctl.c: ignore out-of-range taint bits introduced via kernel.tainted
Users with SYS_ADMIN capability can add arbitrary taint flags to the
running kernel by writing to /proc/sys/kernel/tainted or issuing the
command 'sysctl -w kernel.tainted=...'. This interface, however, is
open for any integer value and this might cause an invalid set of flags
being committed to the tainted_mask bitset.
This patch introduces a simple way for proc_taint() to ignore any
eventual invalid bit coming from the user input before committing those
bits to the kernel tainted_mask.
Signed-off-by: Rafael Aquini <aquini@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Link: http://lkml.kernel.org/r/20200512223946.888020-1-aquini@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/powerpc/perf/callchain_64.c')
0 files changed, 0 insertions, 0 deletions