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([2401:4900:b50e:ee5b:78d:f26b:704b:c464]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82a072449fesm10192206b3a.13.2026.03.14.21.09.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 14 Mar 2026 21:09:31 -0700 (PDT) From: Mathura_Kumar To: brauner@kernel.org Cc: academic1mathura@gmail.com, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk Subject: [PATCH v1 1/4] IPC: Added New system call do_mq_timedreceive2() for non-destructive peek on posix mqueue Date: Sun, 15 Mar 2026 09:37:57 +0530 Message-ID: <20260315040827.156558-2-academic1mathura@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260315040827.156558-1-academic1mathura@gmail.com> References: <20260315040827.156558-1-academic1mathura@gmail.com> Precedence: bulk X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Signed-off-by: Mathura_Kumar --- include/linux/compat.h | 6 +- include/linux/syscalls.h | 6 + include/uapi/asm-generic/unistd.h | 7 +- include/uapi/linux/mqueue.h | 18 ++- ipc/mqueue.c | 186 ++++++++++++++++++++++++++++-- ipc/msg.c | 2 +- ipc/msgutil.c | 48 ++++---- ipc/util.h | 3 +- kernel/sys_ni.c | 1 + 9 files changed, 235 insertions(+), 42 deletions(-) diff --git a/include/linux/compat.h b/include/linux/compat.h index 56cebaff0c91..9f5ca26e76d8 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -22,6 +22,7 @@ #include #include #include +#include #ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER /* @@ -801,8 +802,9 @@ asmlinkage long compat_sys_pwritev64v2(unsigned long fd, const struct iovec __user *vec, unsigned long vlen, loff_t pos, rwf_t flags); #endif - - +asmlinkage long compat_sys_mq_timedreceive2(mqd_t mqdes, struct compat_mq_timedreceive2_args __user *uargs, + unsigned int flags, unsigned long index, + struct old_timespec32 __user *abs_timeout); /* * Deprecated system calls which are still defined in * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h index 02bd6ddb6278..993e570c90ab 100644 --- a/include/linux/syscalls.h +++ b/include/linux/syscalls.h @@ -79,6 +79,7 @@ struct mnt_id_req; struct ns_id_req; struct xattr_args; struct file_attr; +struct mq_timedreceive2_args; #include #include @@ -93,6 +94,7 @@ struct file_attr; #include #include #include +#include #ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER /* @@ -746,6 +748,10 @@ asmlinkage long sys_mq_timedsend_time32(mqd_t mqdes, const char __user *u_msg_ptr, unsigned int msg_len, unsigned int msg_prio, const struct old_timespec32 __user *u_abs_timeout); +asmlinkage long +sys_mq_timedreceive2(mqd_t mqdes, struct mq_timedreceive2_args __user *uargs, + unsigned int flags, unsigned long index, + struct __kernel_timespec __user *abs_timeout); asmlinkage long sys_msgget(key_t key, int msgflg); asmlinkage long sys_old_msgctl(int msqid, int cmd, struct msqid_ds __user *buf); asmlinkage long sys_msgctl(int msqid, int cmd, struct msqid_ds __user *buf); diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h index a627acc8fb5f..200ee7fde5c4 100644 --- a/include/uapi/asm-generic/unistd.h +++ b/include/uapi/asm-generic/unistd.h @@ -863,9 +863,12 @@ __SYSCALL(__NR_listns, sys_listns) #define __NR_rseq_slice_yield 471 __SYSCALL(__NR_rseq_slice_yield, sys_rseq_slice_yield) -#undef __NR_syscalls -#define __NR_syscalls 472 +#define __NR_mq_timedreceive2 472 +__SC_COMP(__NR_mq_timedreceive2, sys_mq_timedreceive2, + compat_sys_mq_timedreceive2) +#undef __NR_syscalls +#define __NR_syscalls 473 /* * 32 bit systems traditionally used different * syscalls for off_t and loff_t arguments, while diff --git a/include/uapi/linux/mqueue.h b/include/uapi/linux/mqueue.h index b516b66840ad..9a4f5dfa7a68 100644 --- a/include/uapi/linux/mqueue.h +++ b/include/uapi/linux/mqueue.h @@ -18,7 +18,6 @@ #ifndef _LINUX_MQUEUE_H #define _LINUX_MQUEUE_H - #include #define MQ_PRIO_MAX 32768 @@ -33,6 +32,23 @@ struct mq_attr { __kernel_long_t __reserved[4]; /* ignored for input, zeroed for output */ }; +struct mq_timedreceive2_args { + size_t msg_len; + unsigned int *msg_prio; + char *msg_ptr; +}; + +#ifdef CONFIG_COMPAT +#include + +struct compat_mq_timedreceive2_args { + compat_size_t msg_len; + compat_uptr_t msg_prio; + compat_uptr_t msg_ptr; +}; + +#endif + /* * SIGEV_THREAD implementation: * SIGEV_THREAD must be implemented in user space. If SIGEV_THREAD is passed diff --git a/ipc/mqueue.c b/ipc/mqueue.c index 4798b375972b..78dc414967a2 100644 --- a/ipc/mqueue.c +++ b/ipc/mqueue.c @@ -53,6 +53,7 @@ struct mqueue_fs_context { #define SEND 0 #define RECV 1 +#define MQ_PEEK 2 #define STATE_NONE 0 #define STATE_READY 1 @@ -1230,6 +1231,115 @@ static int do_mq_timedreceive(mqd_t mqdes, char __user *u_msg_ptr, return ret; } +static struct msg_msg *mq_peek_index(struct mqueue_inode_info *info, int index) +{ + struct rb_node *node; + struct posix_msg_tree_node *leaf; + struct msg_msg *msg; + + int count = 0; + + /* Start from highest priority */ + node = rb_last(&info->msg_tree); + while (node) { + leaf = rb_entry(node, struct posix_msg_tree_node, rb_node); + list_for_each_entry(msg, &leaf->msg_list, m_list) { + if (count == index) + return msg; + count++; + } + + node = rb_prev(node); + } + + return NULL; +} + +static int do_mq_timedreceive2(mqd_t mqdes, struct mq_timedreceive2_args *args, + unsigned int flags, unsigned long index, + struct timespec64 *ts) +{ + ssize_t ret; + struct msg_msg *msg_ptr, *k_msg_buffer; + long k_m_type; + size_t k_m_ts; + struct inode *inode; + struct mqueue_inode_info *info; + + if (!(flags & MQ_PEEK)) { + return do_mq_timedreceive(mqdes, args->msg_ptr, args->msg_len, + args->msg_prio, ts); + } + audit_mq_sendrecv(mqdes, args->msg_len, 0, ts); + CLASS(fd, f)(mqdes); + if (fd_empty(f)) + return -EBADF; + + inode = file_inode(fd_file(f)); + if (unlikely(fd_file(f)->f_op != &mqueue_file_operations)) + return -EBADF; + info = MQUEUE_I(inode); + audit_file(fd_file(f)); + + if (unlikely(!(fd_file(f)->f_mode & FMODE_READ))) + return -EBADF; + + if (unlikely(args->msg_len < info->attr.mq_msgsize)) + return -EMSGSIZE; + if (index >= (unsigned long)info->attr.mq_maxmsg) + return -ENOENT; + + spin_lock(&info->lock); + if (info->attr.mq_curmsgs == 0) { + spin_unlock(&info->lock); + return -EAGAIN; + } + msg_ptr = mq_peek_index(info, index); + if (!msg_ptr) { + spin_unlock(&info->lock); + return -ENOENT; + } + k_m_type = msg_ptr->m_type; + k_m_ts = msg_ptr->m_ts; + spin_unlock(&info->lock); + + k_msg_buffer = alloc_msg(k_m_ts); + if (!k_msg_buffer) + return -ENOMEM; + + /* + * Two spin locks are necessary here. We are avoiding atomic memory + * allocation and premature allocation before confirming that + * a message actually exists to peek. + */ + spin_lock(&info->lock); + msg_ptr = mq_peek_index(info, index); + if (!msg_ptr || msg_ptr->m_type != k_m_type || + msg_ptr->m_ts != k_m_ts) { + spin_unlock(&info->lock); + free_msg(k_msg_buffer); + return -EAGAIN; + } + if (IS_ERR(copy_msg(msg_ptr, k_msg_buffer, k_m_ts))) { + spin_unlock(&info->lock); + free_msg(k_msg_buffer); + return -EINVAL; + } + spin_unlock(&info->lock); + + ret = k_msg_buffer->m_ts; + if (args->msg_prio && put_user(k_m_type, args->msg_prio)) { + free_msg(k_msg_buffer); + return -EFAULT; + } + if (store_msg(args->msg_ptr, k_msg_buffer, k_m_ts)) { + free_msg(k_msg_buffer); + return -EFAULT; + } + free_msg(k_msg_buffer); + return ret; +} + SYSCALL_DEFINE5(mq_timedsend, mqd_t, mqdes, const char __user *, u_msg_ptr, size_t, msg_len, unsigned int, msg_prio, const struct __kernel_timespec __user *, u_abs_timeout) @@ -1258,6 +1368,27 @@ SYSCALL_DEFINE5(mq_timedreceive, mqd_t, mqdes, char __user *, u_msg_ptr, return do_mq_timedreceive(mqdes, u_msg_ptr, msg_len, u_msg_prio, p); } +SYSCALL_DEFINE5(mq_timedreceive2, mqd_t, mqdes, + struct mq_timedreceive2_args __user *, uargs, unsigned int, + flags, const unsigned long, index, + const struct __kernel_timespec __user *, u_abs_timeout) +{ + struct mq_timedreceive2_args args; + struct timespec64 ts, *p = NULL; + + if (copy_from_user(&args, uargs, sizeof(args))) + return -EFAULT; + + if (u_abs_timeout) { + int res = prepare_timeout(u_abs_timeout, &ts); + + if (res) + return res; + p = &ts; + } + return do_mq_timedreceive2(mqdes, &args, flags, index, p); +} + /* * Notes: the case when user wants us to deregister (with NULL as pointer) * and he isn't currently owner of notification, will be silently discarded. @@ -1449,6 +1580,17 @@ SYSCALL_DEFINE3(mq_getsetattr, mqd_t, mqdes, return 0; } +#ifdef CONFIG_COMPAT_32BIT_TIME +static int compat_prepare_timeout(const struct old_timespec32 __user *p, + struct timespec64 *ts) +{ + if (get_old_timespec32(ts, p)) + return -EFAULT; + if (!timespec64_valid(ts)) + return -EINVAL; + return 0; +} + #ifdef CONFIG_COMPAT struct compat_mq_attr { @@ -1490,6 +1632,22 @@ static inline int put_compat_mq_attr(const struct mq_attr *attr, return 0; } +static inline int get_compat_mq_args(struct mq_timedreceive2_args *args, + struct compat_mq_timedreceive2_args __user *uargs) +{ + struct compat_mq_timedreceive2_args v; + + if (copy_from_user(&v, uargs, sizeof(v))) + return -EFAULT; + + memset(args, 0, sizeof(*args)); + args->msg_len = (size_t)v.msg_len; + args->msg_prio = (unsigned int *)compat_ptr(v.msg_prio); + args->msg_ptr = (char *)compat_ptr(v.msg_ptr); + + return 0; +} + COMPAT_SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, compat_mode_t, mode, struct compat_mq_attr __user *, u_attr) @@ -1541,19 +1699,30 @@ COMPAT_SYSCALL_DEFINE3(mq_getsetattr, mqd_t, mqdes, return -EFAULT; return 0; } -#endif -#ifdef CONFIG_COMPAT_32BIT_TIME -static int compat_prepare_timeout(const struct old_timespec32 __user *p, - struct timespec64 *ts) +COMPAT_SYSCALL_DEFINE5(mq_timedreceive2, mqd_t, mqdes, + struct compat_mq_timedreceive2_args __user *, uargs, + unsigned int, flags, const unsigned long, index, + const struct old_timespec32 __user *, u_abs_timeout) { - if (get_old_timespec32(ts, p)) + struct mq_timedreceive2_args args; + struct timespec64 ts, *p = NULL; + + if (get_compat_mq_args(&args, uargs)) return -EFAULT; - if (!timespec64_valid(ts)) - return -EINVAL; - return 0; + + if (u_abs_timeout) { + int res = compat_prepare_timeout(u_abs_timeout, &ts); + + if (res) + return res; + p = &ts; + } + return do_mq_timedreceive2(mqdes, &args, flags, index, p); } +#endif + SYSCALL_DEFINE5(mq_timedsend_time32, mqd_t, mqdes, const char __user *, u_msg_ptr, unsigned int, msg_len, unsigned int, msg_prio, @@ -1583,6 +1752,7 @@ SYSCALL_DEFINE5(mq_timedreceive_time32, mqd_t, mqdes, } return do_mq_timedreceive(mqdes, u_msg_ptr, msg_len, u_msg_prio, p); } + #endif static const struct inode_operations mqueue_dir_inode_operations = { diff --git a/ipc/msg.c b/ipc/msg.c index 62996b97f0ac..6392b11dd7f7 100644 --- a/ipc/msg.c +++ b/ipc/msg.c @@ -1156,7 +1156,7 @@ static long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, in * not update queue parameters. */ if (msgflg & MSG_COPY) { - msg = copy_msg(msg, copy); + msg = copy_msg(msg, copy, msg->m_ts); goto out_unlock0; } diff --git a/ipc/msgutil.c b/ipc/msgutil.c index e28f0cecb2ec..c5536ce47cc2 100644 --- a/ipc/msgutil.c +++ b/ipc/msgutil.c @@ -51,7 +51,7 @@ static int __init init_msg_buckets(void) } subsys_initcall(init_msg_buckets); -static struct msg_msg *alloc_msg(size_t len) +struct msg_msg *alloc_msg(size_t len) { struct msg_msg *msg; struct msg_msgseg **pseg; @@ -122,39 +122,33 @@ struct msg_msg *load_msg(const void __user *src, size_t len) free_msg(msg); return ERR_PTR(err); } -#ifdef CONFIG_CHECKPOINT_RESTORE -struct msg_msg *copy_msg(struct msg_msg *src, struct msg_msg *dst) + +struct msg_msg *copy_msg(struct msg_msg *src, struct msg_msg *dst, size_t len) { - struct msg_msgseg *dst_pseg, *src_pseg; - size_t len = src->m_ts; - size_t alen; + struct msg_msgseg *src_seg, *dst_seg; + size_t remaining, chunk; - if (src->m_ts > dst->m_ts) + if (len > src->m_ts) return ERR_PTR(-EINVAL); - - alen = min(len, DATALEN_MSG); - memcpy(dst + 1, src + 1, alen); - - for (dst_pseg = dst->next, src_pseg = src->next; - src_pseg != NULL; - dst_pseg = dst_pseg->next, src_pseg = src_pseg->next) { - - len -= alen; - alen = min(len, DATALEN_SEG); - memcpy(dst_pseg + 1, src_pseg + 1, alen); + chunk = min(len, DATALEN_MSG); + memcpy(dst + 1, src + 1, chunk); + remaining = len - chunk; + src_seg = src->next; + dst_seg = dst->next; + while (remaining > 0 && src_seg && dst_seg) { + chunk = min(remaining, DATALEN_SEG); + memcpy(dst_seg + 1, src_seg + 1, chunk); + remaining -= chunk; + src_seg = src_seg->next; + dst_seg = dst_seg->next; } - + if (remaining != 0) + return ERR_PTR(-EINVAL); dst->m_type = src->m_type; - dst->m_ts = src->m_ts; - + dst->m_ts = src->m_ts; return dst; } -#else -struct msg_msg *copy_msg(struct msg_msg *src, struct msg_msg *dst) -{ - return ERR_PTR(-ENOSYS); -} -#endif + int store_msg(void __user *dest, struct msg_msg *msg, size_t len) { size_t alen; diff --git a/ipc/util.h b/ipc/util.h index a55d6cebe6d3..374abeee79b3 100644 --- a/ipc/util.h +++ b/ipc/util.h @@ -197,8 +197,9 @@ int ipc_parse_version(int *cmd); extern void free_msg(struct msg_msg *msg); extern struct msg_msg *load_msg(const void __user *src, size_t len); -extern struct msg_msg *copy_msg(struct msg_msg *src, struct msg_msg *dst); +extern struct msg_msg *copy_msg(struct msg_msg *src, struct msg_msg *dst, size_t len); extern int store_msg(void __user *dest, struct msg_msg *msg, size_t len); +extern struct msg_msg *alloc_msg(size_t len); static inline int ipc_checkid(struct kern_ipc_perm *ipcp, int id) { diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c index add3032da16f..658d6b8274b3 100644 --- a/kernel/sys_ni.c +++ b/kernel/sys_ni.c @@ -391,6 +391,7 @@ COND_SYSCALL(setuid16); /* restartable sequence */ COND_SYSCALL(rseq); COND_SYSCALL(rseq_slice_yield); +COND_SYSCALL(mq_timedreceive2); COND_SYSCALL(uretprobe); COND_SYSCALL(uprobe); -- 2.43.0