summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorJeff Layton <jlayton@kernel.org>2022-08-01 15:57:26 -0400
committerChuck Lever <chuck.lever@oracle.com>2022-08-04 10:28:48 -0400
commit6930bcbfb6ceda63e298c6af6d733ecdf6bd4cde (patch)
tree82234eae589392283b24717de9ac2eac1845cb22
parentdd8dd403d7b223cc77ee89d8d09caf045e90e648 (diff)
lockd: detect and reject lock arguments that overflow
lockd doesn't currently vet the start and length in nlm4 requests like it should, and can end up generating lock requests with arguments that overflow when passed to the filesystem. The NLM4 protocol uses unsigned 64-bit arguments for both start and length, whereas struct file_lock tracks the start and end as loff_t values. By the time we get around to calling nlm4svc_retrieve_args, we've lost the information that would allow us to determine if there was an overflow. Start tracking the actual start and len for NLM4 requests in the nlm_lock. In nlm4svc_retrieve_args, vet these values to ensure they won't cause an overflow, and return NLM4_FBIG if they do. Link: https://bugzilla.linux-nfs.org/show_bug.cgi?id=392 Reported-by: Jan Kasiak <j.kasiak@gmail.com> Signed-off-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Cc: <stable@vger.kernel.org> # 5.14+
-rw-r--r--fs/lockd/svc4proc.c8
-rw-r--r--fs/lockd/xdr4.c19
-rw-r--r--include/linux/lockd/xdr.h2
3 files changed, 12 insertions, 17 deletions
diff --git a/fs/lockd/svc4proc.c b/fs/lockd/svc4proc.c
index 4f247ab8be61..bf274f23969b 100644
--- a/fs/lockd/svc4proc.c
+++ b/fs/lockd/svc4proc.c
@@ -32,6 +32,10 @@ nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
if (!nlmsvc_ops)
return nlm_lck_denied_nolocks;
+ if (lock->lock_start > OFFSET_MAX ||
+ (lock->lock_len && ((lock->lock_len - 1) > (OFFSET_MAX - lock->lock_start))))
+ return nlm4_fbig;
+
/* Obtain host handle */
if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
|| (argp->monitor && nsm_monitor(host) < 0))
@@ -50,6 +54,10 @@ nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
/* Set up the missing parts of the file_lock structure */
lock->fl.fl_file = file->f_file[mode];
lock->fl.fl_pid = current->tgid;
+ lock->fl.fl_start = (loff_t)lock->lock_start;
+ lock->fl.fl_end = lock->lock_len ?
+ (loff_t)(lock->lock_start + lock->lock_len - 1) :
+ OFFSET_MAX;
lock->fl.fl_lmops = &nlmsvc_lock_operations;
nlmsvc_locks_init_private(&lock->fl, host, (pid_t)lock->svid);
if (!lock->fl.fl_owner) {
diff --git a/fs/lockd/xdr4.c b/fs/lockd/xdr4.c
index 856267c0864b..712fdfeb8ef0 100644
--- a/fs/lockd/xdr4.c
+++ b/fs/lockd/xdr4.c
@@ -20,13 +20,6 @@
#include "svcxdr.h"
-static inline loff_t
-s64_to_loff_t(__s64 offset)
-{
- return (loff_t)offset;
-}
-
-
static inline s64
loff_t_to_s64(loff_t offset)
{
@@ -70,8 +63,6 @@ static bool
svcxdr_decode_lock(struct xdr_stream *xdr, struct nlm_lock *lock)
{
struct file_lock *fl = &lock->fl;
- u64 len, start;
- s64 end;
if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
return false;
@@ -81,20 +72,14 @@ svcxdr_decode_lock(struct xdr_stream *xdr, struct nlm_lock *lock)
return false;
if (xdr_stream_decode_u32(xdr, &lock->svid) < 0)
return false;
- if (xdr_stream_decode_u64(xdr, &start) < 0)
+ if (xdr_stream_decode_u64(xdr, &lock->lock_start) < 0)
return false;
- if (xdr_stream_decode_u64(xdr, &len) < 0)
+ if (xdr_stream_decode_u64(xdr, &lock->lock_len) < 0)
return false;
locks_init_lock(fl);
fl->fl_flags = FL_POSIX;
fl->fl_type = F_RDLCK;
- end = start + len - 1;
- fl->fl_start = s64_to_loff_t(start);
- if (len == 0 || end < 0)
- fl->fl_end = OFFSET_MAX;
- else
- fl->fl_end = s64_to_loff_t(end);
return true;
}
diff --git a/include/linux/lockd/xdr.h b/include/linux/lockd/xdr.h
index 398f70093cd3..67e4a2c5500b 100644
--- a/include/linux/lockd/xdr.h
+++ b/include/linux/lockd/xdr.h
@@ -41,6 +41,8 @@ struct nlm_lock {
struct nfs_fh fh;
struct xdr_netobj oh;
u32 svid;
+ u64 lock_start;
+ u64 lock_len;
struct file_lock fl;
};