Messages in this thread Patch in this message | | | Date | Mon, 7 Nov 2011 21:45:22 +0400 | From | Vasiliy Kulikov <> | Subject | [PATCH] proc: restrict access to /proc/interrupts |
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/proc/interrupts contains the number of emitted interrupts, which should not be world readable. The information about keyboard interrupts number may be used to learn the precise number of characters in users' passwords by simply watching the changes of number of emitted interrupts during the life of gksu-like programs.
The PoC is publicly available at:
http://www.openwall.com/lists/oss-security/2011/11/07/9
Cc: <stable@kernel.org> Signed-off-by: Vasiliy Kulikov <segoon@openwall.com> --- fs/proc/interrupts.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/fs/proc/interrupts.c b/fs/proc/interrupts.c index 05029c0..2fe87a1 100644 --- a/fs/proc/interrupts.c +++ b/fs/proc/interrupts.c @@ -47,7 +47,7 @@ static const struct file_operations proc_interrupts_operations = { static int __init proc_interrupts_init(void) { - proc_create("interrupts", 0, NULL, &proc_interrupts_operations); + proc_create("interrupts", S_IRUSR, NULL, &proc_interrupts_operations); return 0; } module_init(proc_interrupts_init); -- 1.7.0.4
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