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Further depessimize priv_check_cred_vfs_generation

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This commit is contained in:
Mateusz Guzik 2020-07-30 22:14:04 +00:00
parent 551cf5ab71
commit 952759111e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=363714
1 changed files with 17 additions and 2 deletions
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19
sys/kern/kern_priv.c
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@ -247,8 +247,8 @@ priv_check(struct thread *td, int priv)
return (priv_check_cred(td->td_ucred, priv));
}
int
priv_check_cred_vfs_generation(struct ucred *cred)
static int __noinline
priv_check_cred_vfs_generation_slow(struct ucred *cred)
{
int error;
@ -271,3 +271,18 @@ priv_check_cred_vfs_generation(struct ucred *cred)
return (priv_check_cred_post(cred, PRIV_VFS_GENERATION, error, true));
}
int
priv_check_cred_vfs_generation(struct ucred *cred)
{
int error;
if (__predict_false(mac_priv_check_fp_flag ||
mac_priv_grant_fp_flag || SDT_PROBES_ENABLED()))
return (priv_check_cred_vfs_generation_slow(cred));
error = EPERM;
if (!jailed(cred) && cred->cr_uid == 0 && suser_enabled)
error = 0;
return (error);
}