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author | Jann Horn <jann@thejh.net> | 2015-09-10 01:38:30 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-09-10 23:29:01 +0300 |
commit | 40f705a736eac10e7dca7ab5dd5ed675a6df031d (patch) | |
tree | 80ad7ecf85ece7a46133fd23b150d05a4074da5a /fs/seq_file.c | |
parent | fbb1816942c04429e85dbf4c1a080accc534299e (diff) | |
download | linux-40f705a736eac10e7dca7ab5dd5ed675a6df031d.tar.xz |
fs: Don't dump core if the corefile would become world-readable.
On a filesystem like vfat, all files are created with the same owner
and mode independent of who created the file. When a vfat filesystem
is mounted with root as owner of all files and read access for everyone,
root's processes left world-readable coredumps on it (but other
users' processes only left empty corefiles when given write access
because of the uid mismatch).
Given that the old behavior was inconsistent and insecure, I don't see
a problem with changing it. Now, all processes refuse to dump core unless
the resulting corefile will only be readable by their owner.
Signed-off-by: Jann Horn <jann@thejh.net>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/seq_file.c')
0 files changed, 0 insertions, 0 deletions