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| author | John Johansen <john.johansen@canonical.com> | 2019-09-13 22:24:23 -0700 |
|---|---|---|
| committer | John Johansen <john.johansen@canonical.com> | 2019-11-22 16:40:21 -0800 |
| commit | bce4e7e9c45ef97ac1e30b9cb4adc25b5b5a7cfa (patch) | |
| tree | 6370690d5d2b83b3f12cc5d441b60947a7cfdf64 | |
| parent | 8f21a62475258ba07b032f5006fb26fd6501f314 (diff) | |
| download | linux-stable-bce4e7e9c45ef97ac1e30b9cb4adc25b5b5a7cfa.tar.gz linux-stable-bce4e7e9c45ef97ac1e30b9cb4adc25b5b5a7cfa.tar.bz2 linux-stable-bce4e7e9c45ef97ac1e30b9cb4adc25b5b5a7cfa.zip | |
apparmor: reduce rcu_read_lock scope for aa_file_perm mediation
Now that the buffers allocation has changed and no longer needs
the full mediation under an rcu_read_lock, reduce the rcu_read_lock
scope to only where it is necessary.
Fixes: df323337e507 ("apparmor: Use a memory pool instead per-CPU caches")
Signed-off-by: John Johansen <john.johansen@canonical.com>
| -rw-r--r-- | security/apparmor/file.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/security/apparmor/file.c b/security/apparmor/file.c index ab56e1994b01..37d62ecec29d 100644 --- a/security/apparmor/file.c +++ b/security/apparmor/file.c @@ -621,7 +621,8 @@ int aa_file_perm(const char *op, struct aa_label *label, struct file *file, fctx = file_ctx(file); rcu_read_lock(); - flabel = rcu_dereference(fctx->label); + flabel = aa_get_newest_label(rcu_dereference(fctx->label)); + rcu_read_unlock(); AA_BUG(!flabel); /* revalidate access, if task is unconfined, or the cached cred @@ -646,8 +647,7 @@ int aa_file_perm(const char *op, struct aa_label *label, struct file *file, error = __file_sock_perm(op, label, flabel, file, request, denied); done: - rcu_read_unlock(); - + aa_put_label(flabel); return error; } |