tree f2b8cc2350bcccb8129e6b1f36b648daa9631c75
parent 1fa2c0a0c814fbae0eb3e79a510765225570d043
parent 9af47666cb0f331bfcd76799ee368cdfcb00882c
author Linus Torvalds <torvalds@linux-foundation.org> 1596831898 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1596831898 -0700
mergetag object 9af47666cb0f331bfcd76799ee368cdfcb00882c
 type commit
 tag kallsyms_show_value-fix-v5.9-rc1
 tagger Kees Cook <keescook@chromium.org> 1596829761 -0700
 
 Fix sysfs module section output overflow
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Merge tag 'kallsyms_show_value-fix-v5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull sysfs module section fix from Kees Cook:
 "Fix sysfs module section output overflow.

  About a month after my kallsyms_show_value() refactoring landed, 0day
  noticed that there was a path through the kernfs binattr read handlers
  that did not have PAGE_SIZEd buffers, and the module "sections" read
  handler made a bad assumption about this, resulting in it stomping on
  memory when reached through small-sized splice() calls.

  I've added a set of tests to find these kinds of regressions more
  quickly in the future as well"

Sefltests-acked-by: Shuah Khan <skhan@linuxfoundation.org>

* tag 'kallsyms_show_value-fix-v5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  selftests: splice: Check behavior of full and short splices
  module: Correctly truncate sysfs sections output