linux-kernel - [PATCH -rc 0/4] Protect from GCC garbage input in GCOV

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Date:   Wed,  2 Sep 2020 11:55:09 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Oberparleiter <oberpar@...ux.ibm.com>
Cc:     Leon Romanovsky <leonro@...dia.com>, linux-kernel@...r.kernel.org,
        Colin Ian King <colin.king@...onical.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH -rc 0/4] Protect from GCC garbage input in GCOV

From: Leon Romanovsky <leonro@...dia.com>

Hi Linus,

Both Colin in Ubuntu [1] and I in FC 32 are having same kernel crashes
while GCOV is enabled. The reason to it that n_fuction variable that
should be provided by GCC is not initialized (or wrongly set).

This patch is based on the RFC [2] which I sent to gather feedback, but
didn't get any response, so sending it to you in proper -rc format.

Bottom line, GCOV is broken on GCC 10.2.

Thanks

[1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1891288
[2] https://lore.kernel.org/lkml/20200827133932.3338519-1-leon@kernel.org

Leon Romanovsky (4):
  gcov: Open-code kmemdup() to work correctly with kernel and user space
    pointers
  gcov: Use proper duplication routine for const pointer
  gcov: Protect from uninitialized number of functions provided by GCC
    10.2
  gcov: Don't print out-of-memory print for all failed files

 kernel/gcov/fs.c      |  5 +++--
 kernel/gcov/gcc_4_7.c | 17 +++++++++--------
 2 files changed, 12 insertions(+), 10 deletions(-)

--
2.26.2