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staging: android: ram_console: honor dmesg_restrict 

The Linux kernel has a setting called dmesg_restrict. When true,
only processes with CAP_SYSLOG can view the kernel dmesg logs. This
helps prevent leaking of kernel information into user space.

On Android, it's possible to bypass these restrictions by viewing
/proc/last_kmsg.

This change makes /proc/last_kmsg require the same permissions as
dmesg.

CC: Android Kernel Team <kernel-team@android.com>
Signed-off-by: Nick Kralevich <nnk@google.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nick Kralevich 2012-03-07 17:34:38 -08:00 committed by Greg Kroah-Hartman
parent 3a21138d3f
commit dd09979346
1 changed files with 3 additions and 0 deletions
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3
drivers/staging/android/ram_console.c
View File

@ -99,6 +99,9 @@ static ssize_t ram_console_read_old(struct file *file, char __user *buf,
char *str;
int ret;
if (dmesg_restrict && !capable(CAP_SYSLOG))
return -EPERM;
/* Main last_kmsg log */
if (pos < old_log_size) {
count = min(len, (size_t)(old_log_size - pos));