[PATCH v6 1/3] fanotify: Ensure consistent variable type for response

The user space API for the response variable is __u32. This patch makes sure that the whole path through the kernel uses u32 so that there is no sign extension or truncation of the user space response. Suggested-by: Steve Grubb <sgrubb(a)redhat.com&gt; Link: https://lore.kernel.org/r/12617626.uLZWGnKmhe@x2 Signed-off-by: Richard Guy Briggs <rgb(a)redhat.com&gt; Acked-by: Paul Moore <paul(a)paul-moore.com&gt; --- fs/notify/fanotify/fanotify.h | 2 +- fs/notify/fanotify/fanotify_user.c | 6 +++--- include/linux/audit.h | 6 +++--- kernel/auditsc.c | 2 +- 4 files changed, 8 insertions(+), 8 deletions(-) diff --git a/fs/notify/fanotify/fanotify.h b/fs/notify/fanotify/fanotify.h index 57f51a9a3015..f899d610bc08 100644 --- a/fs/notify/fanotify/fanotify.h +++ b/fs/notify/fanotify/fanotify.h @@ -425,7 +425,7 @@ FANOTIFY_PE(struct fanotify_event *event) struct fanotify_perm_event { struct fanotify_event fae; struct path path; - unsigned short response; /* userspace answer to the event */ + u32 response; /* userspace answer to the event */ unsigned short state; /* state of the event */ int fd; /* fd we passed to userspace for this event */ }; diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c index 4546da4a54f9..caa1211bac8c 100644 --- a/fs/notify/fanotify/fanotify_user.c +++ b/fs/notify/fanotify/fanotify_user.c @@ -289,7 +289,7 @@ static int create_fd(struct fsnotify_group *group, const struct path *path, */ static void finish_permission_event(struct fsnotify_group *group, struct fanotify_perm_event *event, - unsigned int response) + u32 response) __releases(&group->notification_lock) { bool destroy = false; @@ -310,9 +310,9 @@ static int process_access_response(struct fsnotify_group *group, { struct fanotify_perm_event *event; int fd = response_struct->fd; - int response = response_struct->response; + u32 response = response_struct->response; - pr_debug("%s: group=%p fd=%d response=%d\n", __func__, group, + pr_debug("%s: group=%p fd=%d response=%u\n", __func__, group, fd, response); /* * make sure the response is valid, if invalid we do nothing and either diff --git a/include/linux/audit.h b/include/linux/audit.h index 3608992848d3..d6b7d0c7ce43 100644 --- a/include/linux/audit.h +++ b/include/linux/audit.h @@ -416,7 +416,7 @@ extern void __audit_log_capset(const struct cred *new, const struct cred *old); extern void __audit_mmap_fd(int fd, int flags); extern void __audit_openat2_how(struct open_how *how); extern void __audit_log_kern_module(char *name); -extern void __audit_fanotify(unsigned int response); +extern void __audit_fanotify(u32 response); extern void __audit_tk_injoffset(struct timespec64 offset); extern void __audit_ntp_log(const struct audit_ntp_data *ad); extern void __audit_log_nfcfg(const char *name, u8 af, unsigned int nentries, @@ -523,7 +523,7 @@ static inline void audit_log_kern_module(char *name) __audit_log_kern_module(name); } -static inline void audit_fanotify(unsigned int response) +static inline void audit_fanotify(u32 response) { if (!audit_dummy_context()) __audit_fanotify(response); @@ -679,7 +679,7 @@ static inline void audit_log_kern_module(char *name) { } -static inline void audit_fanotify(unsigned int response) +static inline void audit_fanotify(u32 response) { } static inline void audit_tk_injoffset(struct timespec64 offset) diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 547c88be8a28..d1fb821de104 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -2877,7 +2877,7 @@ void __audit_log_kern_module(char *name) context->type = AUDIT_KERN_MODULE; } -void __audit_fanotify(unsigned int response) +void __audit_fanotify(u32 response) { audit_log(audit_context(), GFP_KERNEL, AUDIT_FANOTIFY, "resp=%u", response); -- 2.27.0