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staging: android: logger: enforce GID and CAP check on log flush

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Restrict log flushing to those in the logs group, or
anyone with CAP_SYSLOG.

Cc: Android Kernel Team <kernel-team@android.com>
Cc: Charndeep Grewal <csgrewa@tycho.ncsc.mil>
Signed-off-by: Charndeep Grewal <csgrewa@tycho.ncsc.mil>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Charndeep Grewal 2013-02-26 22:07:38 -08:00 committed by Greg Kroah-Hartman
parent 0441bcf4db
commit 1e70bd46a5
1 changed files with 5 additions and 0 deletions
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5
drivers/staging/android/logger.c
View file

@ -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;