From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: stable@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
patches@lists.linux.dev, Hengyu Liang <hengyul@cs.unc.edu>,
Jens Axboe <axboe@kernel.dk>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 6.18 48/52] io_uring: do not charge the SQ/CQ rings to RLIMIT_MEMLOCK
Date: Sat, 17 Oct 2026 17:54:49 +0200 [thread overview]
Message-ID: <20261017155106.385559234@linuxfoundation.org> (raw)
In-Reply-To: <20261017155104.830766652@linuxfoundation.org>
6.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Hengyu Liang <hengyul@cs.unc.edu>
commit b59cabf9b4acb65f3f9968087ca0e18010d85076 upstream.
Commit 8078486e1d53 ("io_uring: use region api for SQ") and commit
81a4058e0cd0 ("io_uring: use region api for CQ") made io_uring_setup()
allocate the rings with io_create_region().
However, io_create_region() charges the memory to RLIMIT_MEMLOCK, and
the rings had been exempt from that limit since commit 26bfa89e25f4
("io_uring: place ring SQ/CQ arrays under memcg memory limits"). As of
now, a user without CAP_IPC_LOCK gets ENOMEM from io_uring_setup() when
their rings exceed the limit, which is 8 MiB by default. PostgreSQL
developers have already hit this in their io_uring tests [1].
The issue can be reproduced with a simple liburing program, run as an
unprivileged user:
#include <liburing.h>
#include <stdio.h>
int main(void)
{
static struct io_uring ring[64];
int i;
for (i = 0; i < 64; i++)
if (io_uring_queue_init(4096, &ring[i], 0) < 0)
break;
printf("%d rings\n", i);
return 0;
}
Before those commits (v6.13), it prints "64 rings". After those commits
(v6.14), it prints "21 rings".
This patch makes io_create_region() take the user to charge, and passes
no user for the SQ/CQ rings.
Link: https://www.postgresql.org/message-id/flat/667f7dcf-404b-4898-a426-57ca6e0617f6@gmail.com [1]
Fixes: 8078486e1d53 ("io_uring: use region api for SQ")
Fixes: 81a4058e0cd0 ("io_uring: use region api for CQ")
Cc: stable@vger.kernel.org
Signed-off-by: Hengyu Liang <hengyul@cs.unc.edu>
Link: https://lore.kernel.org/io-uring/20261006125732.3425762-1-hengyul@cs.unc.edu/
[axboe: 6.18 still has the ctx based region API. Convert
io_create_region() and io_free_region() to take the user_struct,
and add a user argument to io_create_region_mmap_safe()]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
io_uring/io_uring.c | 12 +++++++-----
io_uring/kbuf.c | 6 +++---
io_uring/memmap.c | 29 ++++++++++++++---------------
io_uring/memmap.h | 6 +++---
io_uring/register.c | 15 ++++++++-------
io_uring/zcrx.c | 4 ++--
6 files changed, 37 insertions(+), 35 deletions(-)
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 524669ee19982..ad5e203e0d5ff 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -2832,8 +2832,9 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, u32 flags,
static void io_rings_free(struct io_ring_ctx *ctx)
{
- io_free_region(ctx, &ctx->sq_region);
- io_free_region(ctx, &ctx->ring_region);
+ /* ring memory is not charged to RLIMIT_MEMLOCK, hence no user */
+ io_free_region(NULL, &ctx->sq_region);
+ io_free_region(NULL, &ctx->ring_region);
ctx->rings = NULL;
RCU_INIT_POINTER(ctx->rings_rcu, NULL);
ctx->sq_sqes = NULL;
@@ -2915,7 +2916,7 @@ static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx)
io_eventfd_unregister(ctx);
io_free_alloc_caches(ctx);
io_destroy_buffers(ctx);
- io_free_region(ctx, &ctx->param_region);
+ io_free_region(ctx->user, &ctx->param_region);
mutex_unlock(&ctx->uring_lock);
if (ctx->sq_creds)
put_cred(ctx->sq_creds);
@@ -3688,7 +3689,8 @@ static __cold int io_allocate_scq_urings(struct io_ring_ctx *ctx,
rd.user_addr = p->cq_off.user_addr;
rd.flags |= IORING_MEM_REGION_TYPE_USER;
}
- ret = io_create_region(ctx, &ctx->ring_region, &rd, IORING_OFF_CQ_RING);
+ /* ring memory is not charged to RLIMIT_MEMLOCK, hence no user */
+ ret = io_create_region(NULL, &ctx->ring_region, &rd, IORING_OFF_CQ_RING);
if (ret)
return ret;
ctx->rings = rings = io_region_get_ptr(&ctx->ring_region);
@@ -3711,7 +3713,7 @@ static __cold int io_allocate_scq_urings(struct io_ring_ctx *ctx,
rd.user_addr = p->sq_off.user_addr;
rd.flags |= IORING_MEM_REGION_TYPE_USER;
}
- ret = io_create_region(ctx, &ctx->sq_region, &rd, IORING_OFF_SQES);
+ ret = io_create_region(NULL, &ctx->sq_region, &rd, IORING_OFF_SQES);
if (ret) {
io_rings_free(ctx);
return ret;
diff --git a/io_uring/kbuf.c b/io_uring/kbuf.c
index c260d5f34cf36..48e599996ab3f 100644
--- a/io_uring/kbuf.c
+++ b/io_uring/kbuf.c
@@ -444,7 +444,7 @@ static int io_remove_buffers_legacy(struct io_ring_ctx *ctx,
static void io_put_bl(struct io_ring_ctx *ctx, struct io_buffer_list *bl)
{
if (bl->flags & IOBL_BUF_RING)
- io_free_region(ctx, &bl->region);
+ io_free_region(ctx->user, &bl->region);
else
io_remove_buffers_legacy(ctx, bl, -1U);
@@ -661,7 +661,7 @@ int io_register_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg)
rd.user_addr = reg.ring_addr;
rd.flags |= IORING_MEM_REGION_TYPE_USER;
}
- ret = io_create_region_mmap_safe(ctx, &bl->region, &rd, mmap_offset);
+ ret = io_create_region_mmap_safe(ctx, ctx->user, &bl->region, &rd, mmap_offset);
if (ret)
goto fail;
br = io_region_get_ptr(&bl->region);
@@ -695,7 +695,7 @@ int io_register_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg)
if (!ret)
return 0;
fail:
- io_free_region(ctx, &bl->region);
+ io_free_region(ctx->user, &bl->region);
kfree(bl);
return ret;
}
diff --git a/io_uring/memmap.c b/io_uring/memmap.c
index add03ca75cb90..3855452f48e29 100644
--- a/io_uring/memmap.c
+++ b/io_uring/memmap.c
@@ -88,7 +88,7 @@ enum {
IO_REGION_F_SINGLE_REF = 4,
};
-void io_free_region(struct io_ring_ctx *ctx, struct io_mapped_region *mr)
+void io_free_region(struct user_struct *user, struct io_mapped_region *mr)
{
if (mr->pages) {
long nr_refs = mr->nr_pages;
@@ -105,8 +105,8 @@ void io_free_region(struct io_ring_ctx *ctx, struct io_mapped_region *mr)
}
if ((mr->flags & IO_REGION_F_VMAP) && mr->ptr)
vunmap(mr->ptr);
- if (mr->nr_pages && ctx->user)
- __io_unaccount_mem(ctx->user, mr->nr_pages);
+ if (mr->nr_pages && user)
+ __io_unaccount_mem(user, mr->nr_pages);
memset(mr, 0, sizeof(*mr));
}
@@ -131,8 +131,7 @@ static int io_region_init_ptr(struct io_mapped_region *mr)
return 0;
}
-static int io_region_pin_pages(struct io_ring_ctx *ctx,
- struct io_mapped_region *mr,
+static int io_region_pin_pages(struct io_mapped_region *mr,
struct io_uring_region_desc *reg)
{
unsigned long size = (size_t) mr->nr_pages << PAGE_SHIFT;
@@ -150,8 +149,7 @@ static int io_region_pin_pages(struct io_ring_ctx *ctx,
return 0;
}
-static int io_region_allocate_pages(struct io_ring_ctx *ctx,
- struct io_mapped_region *mr,
+static int io_region_allocate_pages(struct io_mapped_region *mr,
struct io_uring_region_desc *reg,
unsigned long mmap_offset)
{
@@ -185,7 +183,7 @@ static int io_region_allocate_pages(struct io_ring_ctx *ctx,
return 0;
}
-int io_create_region(struct io_ring_ctx *ctx, struct io_mapped_region *mr,
+int io_create_region(struct user_struct *user, struct io_mapped_region *mr,
struct io_uring_region_desc *reg,
unsigned long mmap_offset)
{
@@ -211,17 +209,17 @@ int io_create_region(struct io_ring_ctx *ctx, struct io_mapped_region *mr,
return -EOVERFLOW;
nr_pages = reg->size >> PAGE_SHIFT;
- if (ctx->user) {
- ret = __io_account_mem(ctx->user, nr_pages);
+ if (user) {
+ ret = __io_account_mem(user, nr_pages);
if (ret)
return ret;
}
mr->nr_pages = nr_pages;
if (reg->flags & IORING_MEM_REGION_TYPE_USER)
- ret = io_region_pin_pages(ctx, mr, reg);
+ ret = io_region_pin_pages(mr, reg);
else
- ret = io_region_allocate_pages(ctx, mr, reg, mmap_offset);
+ ret = io_region_allocate_pages(mr, reg, mmap_offset);
if (ret)
goto out_free;
@@ -230,11 +228,12 @@ int io_create_region(struct io_ring_ctx *ctx, struct io_mapped_region *mr,
goto out_free;
return 0;
out_free:
- io_free_region(ctx, mr);
+ io_free_region(user, mr);
return ret;
}
-int io_create_region_mmap_safe(struct io_ring_ctx *ctx, struct io_mapped_region *mr,
+int io_create_region_mmap_safe(struct io_ring_ctx *ctx, struct user_struct *user,
+ struct io_mapped_region *mr,
struct io_uring_region_desc *reg,
unsigned long mmap_offset)
{
@@ -242,7 +241,7 @@ int io_create_region_mmap_safe(struct io_ring_ctx *ctx, struct io_mapped_region
int ret;
memcpy(&tmp_mr, mr, sizeof(tmp_mr));
- ret = io_create_region(ctx, &tmp_mr, reg, mmap_offset);
+ ret = io_create_region(user, &tmp_mr, reg, mmap_offset);
if (ret)
return ret;
diff --git a/io_uring/memmap.h b/io_uring/memmap.h
index 08419684e4bc9..8128be8e5ebc3 100644
--- a/io_uring/memmap.h
+++ b/io_uring/memmap.h
@@ -16,12 +16,12 @@ unsigned long io_uring_get_unmapped_area(struct file *file, unsigned long addr,
unsigned long flags);
int io_uring_mmap(struct file *file, struct vm_area_struct *vma);
-void io_free_region(struct io_ring_ctx *ctx, struct io_mapped_region *mr);
-int io_create_region(struct io_ring_ctx *ctx, struct io_mapped_region *mr,
+void io_free_region(struct user_struct *user, struct io_mapped_region *mr);
+int io_create_region(struct user_struct *user, struct io_mapped_region *mr,
struct io_uring_region_desc *reg,
unsigned long mmap_offset);
-int io_create_region_mmap_safe(struct io_ring_ctx *ctx,
+int io_create_region_mmap_safe(struct io_ring_ctx *ctx, struct user_struct *user,
struct io_mapped_region *mr,
struct io_uring_region_desc *reg,
unsigned long mmap_offset);
diff --git a/io_uring/register.c b/io_uring/register.c
index 6c4ef485212d9..741cd294773e1 100644
--- a/io_uring/register.c
+++ b/io_uring/register.c
@@ -383,8 +383,9 @@ static void io_register_free_rings(struct io_ring_ctx *ctx,
struct io_uring_params *p,
struct io_ring_ctx_rings *r)
{
- io_free_region(ctx, &r->sq_region);
- io_free_region(ctx, &r->ring_region);
+ /* ring memory is not charged to RLIMIT_MEMLOCK, hence no user */
+ io_free_region(NULL, &r->sq_region);
+ io_free_region(NULL, &r->ring_region);
}
#define swap_old(ctx, o, n, field) \
@@ -433,7 +434,7 @@ static int io_register_resize_rings(struct io_ring_ctx *ctx, void __user *arg)
rd.user_addr = p.cq_off.user_addr;
rd.flags |= IORING_MEM_REGION_TYPE_USER;
}
- ret = io_create_region_mmap_safe(ctx, &n.ring_region, &rd, IORING_OFF_CQ_RING);
+ ret = io_create_region_mmap_safe(ctx, NULL, &n.ring_region, &rd, IORING_OFF_CQ_RING);
if (ret) {
io_register_free_rings(ctx, &p, &n);
return ret;
@@ -473,7 +474,7 @@ static int io_register_resize_rings(struct io_ring_ctx *ctx, void __user *arg)
rd.user_addr = p.sq_off.user_addr;
rd.flags |= IORING_MEM_REGION_TYPE_USER;
}
- ret = io_create_region_mmap_safe(ctx, &n.sq_region, &rd, IORING_OFF_SQES);
+ ret = io_create_region_mmap_safe(ctx, NULL, &n.sq_region, &rd, IORING_OFF_SQES);
if (ret) {
io_register_free_rings(ctx, &p, &n);
return ret;
@@ -633,13 +634,13 @@ static int io_register_mem_region(struct io_ring_ctx *ctx, void __user *uarg)
!(ctx->flags & IORING_SETUP_R_DISABLED))
return -EINVAL;
- ret = io_create_region_mmap_safe(ctx, &ctx->param_region, &rd,
- IORING_MAP_OFF_PARAM_REGION);
+ ret = io_create_region_mmap_safe(ctx, ctx->user, &ctx->param_region,
+ &rd, IORING_MAP_OFF_PARAM_REGION);
if (ret)
return ret;
if (copy_to_user(rd_uptr, &rd, sizeof(rd))) {
guard(mutex)(&ctx->mmap_lock);
- io_free_region(ctx, &ctx->param_region);
+ io_free_region(ctx->user, &ctx->param_region);
return -EFAULT;
}
diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c
index 56a6a0e52e51e..b44d8ba53e59d 100644
--- a/io_uring/zcrx.c
+++ b/io_uring/zcrx.c
@@ -371,7 +371,7 @@ static int io_allocate_rbuf_ring(struct io_zcrx_ifq *ifq,
mmap_offset = IORING_MAP_OFF_ZCRX_REGION;
mmap_offset += id << IORING_OFF_PBUF_SHIFT;
- ret = io_create_region(ifq->ctx, &ifq->region, rd, mmap_offset);
+ ret = io_create_region(ifq->ctx->user, &ifq->region, rd, mmap_offset);
if (ret < 0)
return ret;
@@ -387,7 +387,7 @@ static int io_allocate_rbuf_ring(struct io_zcrx_ifq *ifq,
static void io_free_rbuf_ring(struct io_zcrx_ifq *ifq)
{
- io_free_region(ifq->ctx, &ifq->region);
+ io_free_region(ifq->ctx->user, &ifq->region);
ifq->rq_ring = NULL;
ifq->rqes = NULL;
}
--
2.53.0
next prev parent reply other threads:[~2026-10-17 15:57 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-17 15:54 [PATCH 6.18 00/52] 6.18.58-rc1 review Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 01/52] spi: mpc52xx: clean up interrupt handling Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 02/52] usb: gadget: f_hid: Add missing error code Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 03/52] RDMA/erdma: Use IRQ-safe XArray helpers for QP and CQ tables Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 04/52] PCI: dwc: Return -ENODEV from dw_pcie_wait_for_link() if device is not found Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 05/52] PCI: dwc: Return -EIO from dw_pcie_wait_for_link() if device is not active Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 06/52] ip6_gre: remove obsolete ERSPAN PMTU update Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 07/52] drm/amd: Create a device link between APU display and XHCI devices Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 08/52] iavf: iavf_virtchnl_completion: drop duplicate ether_addr_equal() test Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 09/52] iavf: send MAC change request synchronously Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 10/52] mm/mremap: fix locked_vm leak by splitting VMA for MREMAP_DONTUNMAP Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 11/52] mm/mremap: fix locked_vm leak from MREMAP_DONTUNMAP self-merge Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 12/52] nfsd: fix all-zero stateid in CB_OFFLOAD for async COPY Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 13/52] wifi: mt76: connac: tolerate inactive BSS deactivation Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 14/52] dm-integrity: fix NULL pointer dereference when the R flag is used Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 15/52] dm-integrity: validate the superblock on resume Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 16/52] sched_ext: Fix CPU hotplug hang when a dying CPUs tasks sit in the BPF scheduler Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 17/52] Bluetooth: RFCOMM: connect the session socket without rfcomm_mutex Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 18/52] net: xilinx: axienet: Free outstanding DMA buffers on dmaengine stop Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 19/52] net: mana: reserve RX buffer headroom to fix forwarding performance Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 20/52] riscv: patch: Avoid early phys_to_page() Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 21/52] riscv: patch: fix handling of bpf-jit execmem addresses Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 22/52] scsi: ufs: core: Decouple CQ sweep from request iterator in MCQ Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 23/52] scsi: ch: Do not keep references to data transfer element devices Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 24/52] scsi: ufs: core: Move an assignment in ufshcd_mcq_process_cqe() Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 25/52] scsi: ufs: core: Add debug log for MCQ command timeout Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 26/52] scsi: ufs: core: Add a comment block above ufshcd_mcq_compl_all_cqes_lock() Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 27/52] scsi: ufs: core: Avoid unsafe MMIO reads in ufshcd_mcq_compl_all_cqes_lock() Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 28/52] drm/xe/i2c: cancel the client work on remove Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 29/52] cifs: fix time_last_write stamp placement in setattr/truncate paths Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 30/52] fat: stop reading directory entries past the end-of-directory marker Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 31/52] ima: Access decompressed kernel module to verify appended signature Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 32/52] ima: Fix stack-out-of-bounds in is_bprm_creds_for_exec() Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 33/52] ice: remove legacy Rx and construct SKB Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 34/52] ice: drop page splitting and recycling Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 35/52] ice: fix crash in ethtool offline loopback test Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 36/52] ice: fix rxq info registering in mbuf packets Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 37/52] ice: change XDP RxQ frag_size from DMA write length to xdp.frame_sz Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 38/52] xfs: factor out xfs_attr3_node_entry_remove Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 39/52] xfs: factor out xfs_attr3_leaf_init Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 40/52] xfs: close crash window in attr dabtree inactivation Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 41/52] mm/damon/core: cancel damos_walk() before damon_ctx->kdamond reset Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 42/52] mm/damon/core: fix damos_walk() vs kdamond_fn() exit race Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 43/52] selinux: allow multiple opens of /sys/fs/selinux/policy Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 44/52] usb: iowarrior: remove inherent race with minor number Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 45/52] USB: iowarrior: fix use-after-free on disconnect race Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 46/52] ice: fix broken Rx on VFs Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 47/52] rose: hold a reference on incoming sockets queued for accept() Greg Kroah-Hartman
2026-10-17 15:54 ` Greg Kroah-Hartman [this message]
2026-10-17 15:54 ` [PATCH 6.18 49/52] io_uring/kbuf: dont charge provided buffer rings to RLIMIT_MEMLOCK Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 50/52] kho: free chunks using free_page() instead of kfree() Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 51/52] bpf, sockmap: Account for receive queue in FIONREAD without a verdict program Greg Kroah-Hartman
2026-10-17 15:54 ` [PATCH 6.18 52/52] wifi: atk9k: Revert "wifi: ath9k: reject short WMI command responses" Greg Kroah-Hartman
2026-10-17 17:19 ` [PATCH 6.18 00/52] 6.18.58-rc1 review Brett A C Sheffield
2026-10-17 22:19 ` Peter Schneider
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