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Groups > linux.kernel > #1739922

[RFC v2 0/2] Restrict dangerous open in sticky directories

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This patch-set introduces two separate features aimed at restricting
dangerous open in world or group writable sticky directories.
The purpose is to prevent exploitable bugs in user-space programs
that don't access sticky directories in the proper way.
The first patch prevents the O_CREAT open of FIFOs and regular files
in world or group writable sticky directories if they already exists
and are owned by someone else.
The second patch prevents O_CREAT open in world or group writable
sticky when the O_EXCL flag is not set, even if the file doesn't
exist yet.
More details can be found in respective commit messages.

Salvatore Mesoraca (2):
  Protected FIFOs and regular files
  Protected O_CREAT open in sticky directory

 Documentation/sysctl/fs.txt |  66 +++++++++++++++++++++++++
 fs/namei.c                  | 118 ++++++++++++++++++++++++++++++++++++++++++--
 include/linux/fs.h          |   3 ++
 kernel/sysctl.c             |  27 ++++++++++
 4 files changed, 211 insertions(+), 3 deletions(-)

-- 
1.9.1

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[RFC v2 0/2] Restrict dangerous open in sticky directories Salvatore Mesoraca <s.mesoraca16@gmail.com> - 2017-09-26 16:20 +0200
  [RFC v2 2/2] Protected O_CREAT open in sticky directory Salvatore Mesoraca <s.mesoraca16@gmail.com> - 2017-09-26 16:20 +0200
    Re: [kernel-hardening] [RFC v2 2/2] Protected O_CREAT open in sticky directory Jann Horn <jannh@google.com> - 2017-09-26 16:50 +0200
      Re: [kernel-hardening] [RFC v2 2/2] Protected O_CREAT open in sticky directory Salvatore Mesoraca <s.mesoraca16@gmail.com> - 2017-09-26 17:20 +0200

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