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| author | Stephane Eranian <eranian@google.com> | 2013-06-20 11:36:28 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-07-03 10:59:04 -0700 |
| commit | f57f135abe8d94c8d83763de99b01d223b60e1df (patch) | |
| tree | f6635ad22aefc3091cce49d5e3a11e9488dbe57d | |
| parent | 7e6932300a88ed1dfb2aa0f650aecc51e7839634 (diff) | |
| download | linux-stable-f57f135abe8d94c8d83763de99b01d223b60e1df.tar.gz linux-stable-f57f135abe8d94c8d83763de99b01d223b60e1df.tar.bz2 linux-stable-f57f135abe8d94c8d83763de99b01d223b60e1df.zip | |
perf: Disable monitoring on setuid processes for regular users
commit 2976b10f05bd7f6dab9f9e7524451ddfed656a89 upstream.
There was a a bug in setup_new_exec(), whereby
the test to disabled perf monitoring was not
correct because the new credentials for the
process were not yet committed and therefore
the get_dumpable() test was never firing.
The patch fixes the problem by moving the
perf_event test until after the credentials
are committed.
Signed-off-by: Stephane Eranian <eranian@google.com>
Tested-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/exec.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/fs/exec.c b/fs/exec.c index 2b7f5ff64fb9..0ea0b4c476d8 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -1163,13 +1163,6 @@ void setup_new_exec(struct linux_binprm * bprm) set_dumpable(current->mm, suid_dumpable); } - /* - * Flush performance counters when crossing a - * security domain: - */ - if (!get_dumpable(current->mm)) - perf_event_exit_task(current); - /* An exec changes our domain. We are no longer part of the thread group */ @@ -1233,6 +1226,15 @@ void install_exec_creds(struct linux_binprm *bprm) commit_creds(bprm->cred); bprm->cred = NULL; + + /* + * Disable monitoring for regular users + * when executing setuid binaries. Must + * wait until new credentials are committed + * by commit_creds() above + */ + if (get_dumpable(current->mm) != SUID_DUMP_USER) + perf_event_exit_task(current); /* * cred_guard_mutex must be held at least to this point to prevent * ptrace_attach() from altering our determination of the task's |