From: Charndeep Grewal <csgr...@tycho.ncsc.mil>
Restrict log flushing to those in the logs group, or
anyone with CAP_SYSLOG.
Cc: Android Kernel Team <kernel-t...@android.com>
Cc: Charndeep Grewal <csgr...@tycho.ncsc.mil>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Signed-off-by: Charndeep Grewal <csgr...@tycho.ncsc.mil>
Signed-off-by: John Stultz <john.stu...@linaro.org>
---
drivers/staging/android/logger.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/staging/android/logger.c b/drivers/staging/android/logger.c
index cfa6061..b14a557 100644
--- a/drivers/staging/android/logger.c
+++ b/drivers/staging/android/logger.c
@@ -695,6 +695,11 @@ static long logger_ioctl(struct file *file, unsigned int
cmd, unsigned long arg)
ret = -EBADF;
break;
}
+ if (!(in_egroup_p(file->f_dentry->d_inode->i_gid) ||
+ capable(CAP_SYSLOG))) {
+ ret = -EPERM;
+ break;
+ }
list_for_each_entry(reader, &log->readers, list)
reader->r_off = log->w_off;
log->head = log->w_off;
--
1.7.10.4
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