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| author |   Steven Rostedt (VMware) <rostedt@goodmis.org> | 2019-10-11 17:22:50 -0400 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2019-10-12 20:48:06 -0400 |
| commit | 17911ff38aa58d3c95c07589dbf5d3564c4cf3c5 (patch) | |
| tree | 0437649533f3c50b4207fd9368bf47ae06bcfe95 /kernel/trace/trace_stat.c | |
| parent | tracing: Add tracing_check_open_get_tr() (diff) | |
| download | linux-dev-17911ff38aa58d3c95c07589dbf5d3564c4cf3c5.tar.xz linux-dev-17911ff38aa58d3c95c07589dbf5d3564c4cf3c5.zip | |
tracing: Add locked_down checks to the open calls of files created for tracefs
Added various checks on open tracefs calls to see if tracefs is in lockdown
mode, and if so, to return -EPERM.
Note, the event format files (which are basically standard on all machines)
as well as the enabled_functions file (which shows what is currently being
traced) are not lockde down. Perhaps they should be, but it seems counter
intuitive to lockdown information to help you know if the system has been
modified.
Link: http://lkml.kernel.org/r/CAHk-=wj7fGPKUspr579Cii-w_y60PtRaiDgKuxVtBAMK0VNNkA@mail.gmail.com
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace_stat.c')
| -rw-r--r-- | kernel/trace/trace_stat.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/trace/trace_stat.c b/kernel/trace/trace_stat.c index 75bf1bcb4a8a..9ab0a1a7ad5e 100644 --- a/kernel/trace/trace_stat.c +++ b/kernel/trace/trace_stat.c @@ -9,7 +9,7 @@ * */ - +#include <linux/security.h> #include <linux/list.h> #include <linux/slab.h> #include <linux/rbtree.h> @@ -238,6 +238,10 @@ static int tracing_stat_open(struct inode *inode, struct file *file) struct seq_file *m; struct stat_session *session = inode->i_private; + ret = security_locked_down(LOCKDOWN_TRACEFS); + if (ret) + return ret; + ret = stat_seq_init(session); if (ret) return ret; |