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FAILED: patch "[PATCH] misc: fastrpc: Save actual DMA size in fastrpc_map structure" failed to apply to 5.4-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.4.y git checkout FETCH_HEAD git cherry-pick -x 8b5b456222fd604079b5cf2af1f25ad690f54a25 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025101331-obtain-numerate-1cfd@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 8b5b456222fd604079b5cf2af1f25ad690f54a25 Mon Sep 17 00:00:00 2001 From: Ling Xu <quic_lxu5(a)quicinc.com> Date: Fri, 12 Sep 2025 14:12:33 +0100 Subject: [PATCH] misc: fastrpc: Save actual DMA size in fastrpc_map structure For user passed fd buffer, map is created using DMA calls. The map related information is stored in fastrpc_map structure. The actual DMA size is not stored in the structure. Store the actual size of buffer and check it against the user passed size. Fixes: c68cfb718c8f ("misc: fastrpc: Add support for context Invoke method") Cc: stable(a)kernel.org Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov(a)oss.qualcomm.com> Co-developed-by: Ekansh Gupta <ekansh.gupta(a)oss.qualcomm.com> Signed-off-by: Ekansh Gupta <ekansh.gupta(a)oss.qualcomm.com> Signed-off-by: Ling Xu <quic_lxu5(a)quicinc.com> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov(a)linaro.org> Signed-off-by: Srinivas Kandagatla <srini(a)kernel.org> Link: https://lore.kernel.org/r/20250912131236.303102-2-srini@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c index 53e88a1bc430..52571916acd4 100644 --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -323,11 +323,11 @@ static void fastrpc_free_map(struct kref *ref) perm.vmid = QCOM_SCM_VMID_HLOS; perm.perm = QCOM_SCM_PERM_RWX; - err = qcom_scm_assign_mem(map->phys, map->size, + err = qcom_scm_assign_mem(map->phys, map->len, &src_perms, &perm, 1); if (err) { dev_err(map->fl->sctx->dev, "Failed to assign memory phys 0x%llx size 0x%llx err %d\n", - map->phys, map->size, err); + map->phys, map->len, err); return; } } @@ -758,7 +758,8 @@ static int fastrpc_map_create(struct fastrpc_user *fl, int fd, struct fastrpc_session_ctx *sess = fl->sctx; struct fastrpc_map *map = NULL; struct sg_table *table; - int err = 0; + struct scatterlist *sgl = NULL; + int err = 0, sgl_index = 0; if (!fastrpc_map_lookup(fl, fd, ppmap, true)) return 0; @@ -798,7 +799,15 @@ static int fastrpc_map_create(struct fastrpc_user *fl, int fd, map->phys = sg_dma_address(map->table->sgl); map->phys += ((u64)fl->sctx->sid << 32); } - map->size = len; + for_each_sg(map->table->sgl, sgl, map->table->nents, + sgl_index) + map->size += sg_dma_len(sgl); + if (len > map->size) { + dev_dbg(sess->dev, "Bad size passed len 0x%llx map size 0x%llx\n", + len, map->size); + err = -EINVAL; + goto map_err; + } map->va = sg_virt(map->table->sgl); map->len = len; @@ -815,10 +824,10 @@ static int fastrpc_map_create(struct fastrpc_user *fl, int fd, dst_perms[1].vmid = fl->cctx->vmperms[0].vmid; dst_perms[1].perm = QCOM_SCM_PERM_RWX; map->attr = attr; - err = qcom_scm_assign_mem(map->phys, (u64)map->size, &src_perms, dst_perms, 2); + err = qcom_scm_assign_mem(map->phys, (u64)map->len, &src_perms, dst_perms, 2); if (err) { dev_err(sess->dev, "Failed to assign memory with phys 0x%llx size 0x%llx err %d\n", - map->phys, map->size, err); + map->phys, map->len, err); goto map_err; } } @@ -2046,7 +2055,7 @@ static int fastrpc_req_mem_map(struct fastrpc_user *fl, char __user *argp) args[0].length = sizeof(req_msg); pages.addr = map->phys; - pages.size = map->size; + pages.size = map->len; args[1].ptr = (u64) (uintptr_t) &pages; args[1].length = sizeof(pages); @@ -2061,7 +2070,7 @@ static int fastrpc_req_mem_map(struct fastrpc_user *fl, char __user *argp) err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc, &args[0]); if (err) { dev_err(dev, "mem mmap error, fd %d, vaddr %llx, size %lld\n", - req.fd, req.vaddrin, map->size); + req.fd, req.vaddrin, map->len); goto err_invoke; } @@ -2074,7 +2083,7 @@ static int fastrpc_req_mem_map(struct fastrpc_user *fl, char __user *argp) if (copy_to_user((void __user *)argp, &req, sizeof(req))) { /* unmap the memory and release the buffer */ req_unmap.vaddr = (uintptr_t) rsp_msg.vaddr; - req_unmap.length = map->size; + req_unmap.length = map->len; fastrpc_req_mem_unmap_impl(fl, &req_unmap); return -EFAULT; }

3 weeks, 1 day

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FAILED: patch "[PATCH] misc: fastrpc: Save actual DMA size in fastrpc_map structure" failed to apply to 5.10-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y git checkout FETCH_HEAD git cherry-pick -x 8b5b456222fd604079b5cf2af1f25ad690f54a25 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025101330-kerchief-friday-d383@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 8b5b456222fd604079b5cf2af1f25ad690f54a25 Mon Sep 17 00:00:00 2001 From: Ling Xu <quic_lxu5(a)quicinc.com> Date: Fri, 12 Sep 2025 14:12:33 +0100 Subject: [PATCH] misc: fastrpc: Save actual DMA size in fastrpc_map structure For user passed fd buffer, map is created using DMA calls. The map related information is stored in fastrpc_map structure. The actual DMA size is not stored in the structure. Store the actual size of buffer and check it against the user passed size. Fixes: c68cfb718c8f ("misc: fastrpc: Add support for context Invoke method") Cc: stable(a)kernel.org Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov(a)oss.qualcomm.com> Co-developed-by: Ekansh Gupta <ekansh.gupta(a)oss.qualcomm.com> Signed-off-by: Ekansh Gupta <ekansh.gupta(a)oss.qualcomm.com> Signed-off-by: Ling Xu <quic_lxu5(a)quicinc.com> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov(a)linaro.org> Signed-off-by: Srinivas Kandagatla <srini(a)kernel.org> Link: https://lore.kernel.org/r/20250912131236.303102-2-srini@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c index 53e88a1bc430..52571916acd4 100644 --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -323,11 +323,11 @@ static void fastrpc_free_map(struct kref *ref) perm.vmid = QCOM_SCM_VMID_HLOS; perm.perm = QCOM_SCM_PERM_RWX; - err = qcom_scm_assign_mem(map->phys, map->size, + err = qcom_scm_assign_mem(map->phys, map->len, &src_perms, &perm, 1); if (err) { dev_err(map->fl->sctx->dev, "Failed to assign memory phys 0x%llx size 0x%llx err %d\n", - map->phys, map->size, err); + map->phys, map->len, err); return; } } @@ -758,7 +758,8 @@ static int fastrpc_map_create(struct fastrpc_user *fl, int fd, struct fastrpc_session_ctx *sess = fl->sctx; struct fastrpc_map *map = NULL; struct sg_table *table; - int err = 0; + struct scatterlist *sgl = NULL; + int err = 0, sgl_index = 0; if (!fastrpc_map_lookup(fl, fd, ppmap, true)) return 0; @@ -798,7 +799,15 @@ static int fastrpc_map_create(struct fastrpc_user *fl, int fd, map->phys = sg_dma_address(map->table->sgl); map->phys += ((u64)fl->sctx->sid << 32); } - map->size = len; + for_each_sg(map->table->sgl, sgl, map->table->nents, + sgl_index) + map->size += sg_dma_len(sgl); + if (len > map->size) { + dev_dbg(sess->dev, "Bad size passed len 0x%llx map size 0x%llx\n", + len, map->size); + err = -EINVAL; + goto map_err; + } map->va = sg_virt(map->table->sgl); map->len = len; @@ -815,10 +824,10 @@ static int fastrpc_map_create(struct fastrpc_user *fl, int fd, dst_perms[1].vmid = fl->cctx->vmperms[0].vmid; dst_perms[1].perm = QCOM_SCM_PERM_RWX; map->attr = attr; - err = qcom_scm_assign_mem(map->phys, (u64)map->size, &src_perms, dst_perms, 2); + err = qcom_scm_assign_mem(map->phys, (u64)map->len, &src_perms, dst_perms, 2); if (err) { dev_err(sess->dev, "Failed to assign memory with phys 0x%llx size 0x%llx err %d\n", - map->phys, map->size, err); + map->phys, map->len, err); goto map_err; } } @@ -2046,7 +2055,7 @@ static int fastrpc_req_mem_map(struct fastrpc_user *fl, char __user *argp) args[0].length = sizeof(req_msg); pages.addr = map->phys; - pages.size = map->size; + pages.size = map->len; args[1].ptr = (u64) (uintptr_t) &pages; args[1].length = sizeof(pages); @@ -2061,7 +2070,7 @@ static int fastrpc_req_mem_map(struct fastrpc_user *fl, char __user *argp) err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc, &args[0]); if (err) { dev_err(dev, "mem mmap error, fd %d, vaddr %llx, size %lld\n", - req.fd, req.vaddrin, map->size); + req.fd, req.vaddrin, map->len); goto err_invoke; } @@ -2074,7 +2083,7 @@ static int fastrpc_req_mem_map(struct fastrpc_user *fl, char __user *argp) if (copy_to_user((void __user *)argp, &req, sizeof(req))) { /* unmap the memory and release the buffer */ req_unmap.vaddr = (uintptr_t) rsp_msg.vaddr; - req_unmap.length = map->size; + req_unmap.length = map->len; fastrpc_req_mem_unmap_impl(fl, &req_unmap); return -EFAULT; }

3 weeks, 1 day

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FAILED: patch "[PATCH] misc: fastrpc: Save actual DMA size in fastrpc_map structure" failed to apply to 5.15-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x 8b5b456222fd604079b5cf2af1f25ad690f54a25 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025101330-radio-nemesis-fbaf@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 8b5b456222fd604079b5cf2af1f25ad690f54a25 Mon Sep 17 00:00:00 2001 From: Ling Xu <quic_lxu5(a)quicinc.com> Date: Fri, 12 Sep 2025 14:12:33 +0100 Subject: [PATCH] misc: fastrpc: Save actual DMA size in fastrpc_map structure For user passed fd buffer, map is created using DMA calls. The map related information is stored in fastrpc_map structure. The actual DMA size is not stored in the structure. Store the actual size of buffer and check it against the user passed size. Fixes: c68cfb718c8f ("misc: fastrpc: Add support for context Invoke method") Cc: stable(a)kernel.org Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov(a)oss.qualcomm.com> Co-developed-by: Ekansh Gupta <ekansh.gupta(a)oss.qualcomm.com> Signed-off-by: Ekansh Gupta <ekansh.gupta(a)oss.qualcomm.com> Signed-off-by: Ling Xu <quic_lxu5(a)quicinc.com> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov(a)linaro.org> Signed-off-by: Srinivas Kandagatla <srini(a)kernel.org> Link: https://lore.kernel.org/r/20250912131236.303102-2-srini@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c index 53e88a1bc430..52571916acd4 100644 --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -323,11 +323,11 @@ static void fastrpc_free_map(struct kref *ref) perm.vmid = QCOM_SCM_VMID_HLOS; perm.perm = QCOM_SCM_PERM_RWX; - err = qcom_scm_assign_mem(map->phys, map->size, + err = qcom_scm_assign_mem(map->phys, map->len, &src_perms, &perm, 1); if (err) { dev_err(map->fl->sctx->dev, "Failed to assign memory phys 0x%llx size 0x%llx err %d\n", - map->phys, map->size, err); + map->phys, map->len, err); return; } } @@ -758,7 +758,8 @@ static int fastrpc_map_create(struct fastrpc_user *fl, int fd, struct fastrpc_session_ctx *sess = fl->sctx; struct fastrpc_map *map = NULL; struct sg_table *table; - int err = 0; + struct scatterlist *sgl = NULL; + int err = 0, sgl_index = 0; if (!fastrpc_map_lookup(fl, fd, ppmap, true)) return 0; @@ -798,7 +799,15 @@ static int fastrpc_map_create(struct fastrpc_user *fl, int fd, map->phys = sg_dma_address(map->table->sgl); map->phys += ((u64)fl->sctx->sid << 32); } - map->size = len; + for_each_sg(map->table->sgl, sgl, map->table->nents, + sgl_index) + map->size += sg_dma_len(sgl); + if (len > map->size) { + dev_dbg(sess->dev, "Bad size passed len 0x%llx map size 0x%llx\n", + len, map->size); + err = -EINVAL; + goto map_err; + } map->va = sg_virt(map->table->sgl); map->len = len; @@ -815,10 +824,10 @@ static int fastrpc_map_create(struct fastrpc_user *fl, int fd, dst_perms[1].vmid = fl->cctx->vmperms[0].vmid; dst_perms[1].perm = QCOM_SCM_PERM_RWX; map->attr = attr; - err = qcom_scm_assign_mem(map->phys, (u64)map->size, &src_perms, dst_perms, 2); + err = qcom_scm_assign_mem(map->phys, (u64)map->len, &src_perms, dst_perms, 2); if (err) { dev_err(sess->dev, "Failed to assign memory with phys 0x%llx size 0x%llx err %d\n", - map->phys, map->size, err); + map->phys, map->len, err); goto map_err; } } @@ -2046,7 +2055,7 @@ static int fastrpc_req_mem_map(struct fastrpc_user *fl, char __user *argp) args[0].length = sizeof(req_msg); pages.addr = map->phys; - pages.size = map->size; + pages.size = map->len; args[1].ptr = (u64) (uintptr_t) &pages; args[1].length = sizeof(pages); @@ -2061,7 +2070,7 @@ static int fastrpc_req_mem_map(struct fastrpc_user *fl, char __user *argp) err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc, &args[0]); if (err) { dev_err(dev, "mem mmap error, fd %d, vaddr %llx, size %lld\n", - req.fd, req.vaddrin, map->size); + req.fd, req.vaddrin, map->len); goto err_invoke; } @@ -2074,7 +2083,7 @@ static int fastrpc_req_mem_map(struct fastrpc_user *fl, char __user *argp) if (copy_to_user((void __user *)argp, &req, sizeof(req))) { /* unmap the memory and release the buffer */ req_unmap.vaddr = (uintptr_t) rsp_msg.vaddr; - req_unmap.length = map->size; + req_unmap.length = map->len; fastrpc_req_mem_unmap_impl(fl, &req_unmap); return -EFAULT; }

3 weeks, 1 day

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FAILED: patch "[PATCH] misc: fastrpc: Save actual DMA size in fastrpc_map structure" failed to apply to 6.1-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 6.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y git checkout FETCH_HEAD git cherry-pick -x 8b5b456222fd604079b5cf2af1f25ad690f54a25 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025101329-apple-bullfight-c1f9@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 8b5b456222fd604079b5cf2af1f25ad690f54a25 Mon Sep 17 00:00:00 2001 From: Ling Xu <quic_lxu5(a)quicinc.com> Date: Fri, 12 Sep 2025 14:12:33 +0100 Subject: [PATCH] misc: fastrpc: Save actual DMA size in fastrpc_map structure For user passed fd buffer, map is created using DMA calls. The map related information is stored in fastrpc_map structure. The actual DMA size is not stored in the structure. Store the actual size of buffer and check it against the user passed size. Fixes: c68cfb718c8f ("misc: fastrpc: Add support for context Invoke method") Cc: stable(a)kernel.org Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov(a)oss.qualcomm.com> Co-developed-by: Ekansh Gupta <ekansh.gupta(a)oss.qualcomm.com> Signed-off-by: Ekansh Gupta <ekansh.gupta(a)oss.qualcomm.com> Signed-off-by: Ling Xu <quic_lxu5(a)quicinc.com> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov(a)linaro.org> Signed-off-by: Srinivas Kandagatla <srini(a)kernel.org> Link: https://lore.kernel.org/r/20250912131236.303102-2-srini@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c index 53e88a1bc430..52571916acd4 100644 --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -323,11 +323,11 @@ static void fastrpc_free_map(struct kref *ref) perm.vmid = QCOM_SCM_VMID_HLOS; perm.perm = QCOM_SCM_PERM_RWX; - err = qcom_scm_assign_mem(map->phys, map->size, + err = qcom_scm_assign_mem(map->phys, map->len, &src_perms, &perm, 1); if (err) { dev_err(map->fl->sctx->dev, "Failed to assign memory phys 0x%llx size 0x%llx err %d\n", - map->phys, map->size, err); + map->phys, map->len, err); return; } } @@ -758,7 +758,8 @@ static int fastrpc_map_create(struct fastrpc_user *fl, int fd, struct fastrpc_session_ctx *sess = fl->sctx; struct fastrpc_map *map = NULL; struct sg_table *table; - int err = 0; + struct scatterlist *sgl = NULL; + int err = 0, sgl_index = 0; if (!fastrpc_map_lookup(fl, fd, ppmap, true)) return 0; @@ -798,7 +799,15 @@ static int fastrpc_map_create(struct fastrpc_user *fl, int fd, map->phys = sg_dma_address(map->table->sgl); map->phys += ((u64)fl->sctx->sid << 32); } - map->size = len; + for_each_sg(map->table->sgl, sgl, map->table->nents, + sgl_index) + map->size += sg_dma_len(sgl); + if (len > map->size) { + dev_dbg(sess->dev, "Bad size passed len 0x%llx map size 0x%llx\n", + len, map->size); + err = -EINVAL; + goto map_err; + } map->va = sg_virt(map->table->sgl); map->len = len; @@ -815,10 +824,10 @@ static int fastrpc_map_create(struct fastrpc_user *fl, int fd, dst_perms[1].vmid = fl->cctx->vmperms[0].vmid; dst_perms[1].perm = QCOM_SCM_PERM_RWX; map->attr = attr; - err = qcom_scm_assign_mem(map->phys, (u64)map->size, &src_perms, dst_perms, 2); + err = qcom_scm_assign_mem(map->phys, (u64)map->len, &src_perms, dst_perms, 2); if (err) { dev_err(sess->dev, "Failed to assign memory with phys 0x%llx size 0x%llx err %d\n", - map->phys, map->size, err); + map->phys, map->len, err); goto map_err; } } @@ -2046,7 +2055,7 @@ static int fastrpc_req_mem_map(struct fastrpc_user *fl, char __user *argp) args[0].length = sizeof(req_msg); pages.addr = map->phys; - pages.size = map->size; + pages.size = map->len; args[1].ptr = (u64) (uintptr_t) &pages; args[1].length = sizeof(pages); @@ -2061,7 +2070,7 @@ static int fastrpc_req_mem_map(struct fastrpc_user *fl, char __user *argp) err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc, &args[0]); if (err) { dev_err(dev, "mem mmap error, fd %d, vaddr %llx, size %lld\n", - req.fd, req.vaddrin, map->size); + req.fd, req.vaddrin, map->len); goto err_invoke; } @@ -2074,7 +2083,7 @@ static int fastrpc_req_mem_map(struct fastrpc_user *fl, char __user *argp) if (copy_to_user((void __user *)argp, &req, sizeof(req))) { /* unmap the memory and release the buffer */ req_unmap.vaddr = (uintptr_t) rsp_msg.vaddr; - req_unmap.length = map->size; + req_unmap.length = map->len; fastrpc_req_mem_unmap_impl(fl, &req_unmap); return -EFAULT; }

3 weeks, 1 day

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Backport request for commit 134121bfd99a ("ipvs: Defer ip_vs_ftp unregister during netns cleanup")

by Slavin Liu

Hi, I would like to request backporting 134121bfd99a ("ipvs: Defer ip_vs_ftp unregister during netns cleanup") to all LTS kernels. This fixes a UAF vulnerability in IPVS that was introduced since v2.6.39, and the patch applies cleanly to the LTS kernels. thanks, Slavin Liu

3 weeks, 1 day

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Unlock IAA MOBILITY Verified Contacts!

by Ella Brown

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3 weeks, 1 day

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Re: Patch "PCI: Use pci_release_resource() instead of release_resource()" has been added to the 6.17-stable tree

by Ilpo Järvinen

On Sun, 12 Oct 2025, Sasha Levin wrote: > This is a note to let you know that I've just added the patch titled > > PCI: Use pci_release_resource() instead of release_resource() > > to the 6.17-stable tree which can be found at: > http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… > > The filename of the patch is: > pci-use-pci_release_resource-instead-of-release_reso.patch > and it can be found in the queue-6.17 subdirectory. > > If you, or anyone else, feels it should not be added to the stable tree, > please let <stable(a)vger.kernel.org> know about it. Hi Sasha and other stable maintainers, I'm not sure why this is being selected for stable. AFAIK, it doesn't "fix" something but is just a cleanup / consistency improvement. It also makes a subtle change into flags behavior which has some regression potential (although I estimate the likelihoods of problems is low for this change). -- i. > commit a5c01cacc40950fb11cd299334cfbaf0542be443 > Author: Ilpo Järvinen <ilpo.jarvinen(a)linux.intel.com> > Date: Fri Aug 29 16:10:57 2025 +0300 > > PCI: Use pci_release_resource() instead of release_resource() > > [ Upstream commit 3baeae36039afc233d4a42d6ff4aa7019892619f ] > > A few places in setup-bus.c call release_resource() directly and end up > duplicating functionality from pci_release_resource() such as parent check, > logging, and clearing the resource. Worse yet, the way the resource is > cleared is inconsistent between different sites. > > Convert release_resource() calls into pci_release_resource() to remove code > duplication. This will also make the resource start, end, and flags > behavior consistent, i.e., start address is cleared, and only > IORESOURCE_UNSET is asserted for the resource. > > While at it, eliminate the unnecessary initialization of idx variable in > pci_bridge_release_resources(). > > Signed-off-by: Ilpo Järvinen <ilpo.jarvinen(a)linux.intel.com> > Signed-off-by: Bjorn Helgaas <bhelgaas(a)google.com> > Link: https://patch.msgid.link/20250829131113.36754-9-ilpo.jarvinen@linux.intel.c… > Stable-dep-of: 8278c6914306 ("PCI: Preserve bridge window resource type flags") > Signed-off-by: Sasha Levin <sashal(a)kernel.org> > > diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c > index c992707a8ebd6..203c8ebef7029 100644 > --- a/drivers/pci/setup-bus.c > +++ b/drivers/pci/setup-bus.c > @@ -431,8 +431,6 @@ static void __assign_resources_sorted(struct list_head *head, > struct pci_dev_resource *dev_res, *tmp_res, *dev_res2; > struct resource *res; > struct pci_dev *dev; > - const char *res_name; > - int idx; > unsigned long fail_type; > resource_size_t add_align, align; > > @@ -540,14 +538,7 @@ static void __assign_resources_sorted(struct list_head *head, > res = dev_res->res; > dev = dev_res->dev; > > - if (!res->parent) > - continue; > - > - idx = pci_resource_num(dev, res); > - res_name = pci_resource_name(dev, idx); > - pci_dbg(dev, "%s %pR: releasing\n", res_name, res); > - > - release_resource(res); > + pci_release_resource(dev, pci_resource_num(dev, res)); > restore_dev_resource(dev_res); > } > /* Restore start/end/flags from saved list */ > @@ -1716,7 +1707,7 @@ static void pci_bridge_release_resources(struct pci_bus *bus, > struct resource *r; > unsigned int old_flags; > struct resource *b_res; > - int idx = 1; > + int idx, ret; > > b_res = &dev->resource[PCI_BRIDGE_RESOURCES]; > > @@ -1750,21 +1741,18 @@ static void pci_bridge_release_resources(struct pci_bus *bus, > > /* If there are children, release them all */ > release_child_resources(r); > - if (!release_resource(r)) { > - type = old_flags = r->flags & PCI_RES_TYPE_MASK; > - pci_info(dev, "resource %d %pR released\n", > - PCI_BRIDGE_RESOURCES + idx, r); > - /* Keep the old size */ > - resource_set_range(r, 0, resource_size(r)); > - r->flags = 0; > > - /* Avoiding touch the one without PREF */ > - if (type & IORESOURCE_PREFETCH) > - type = IORESOURCE_PREFETCH; > - __pci_setup_bridge(bus, type); > - /* For next child res under same bridge */ > - r->flags = old_flags; > - } > + type = old_flags = r->flags & PCI_RES_TYPE_MASK; > + ret = pci_release_resource(dev, PCI_BRIDGE_RESOURCES + idx); > + if (ret) > + return; > + > + /* Avoiding touch the one without PREF */ > + if (type & IORESOURCE_PREFETCH) > + type = IORESOURCE_PREFETCH; > + __pci_setup_bridge(bus, type); > + /* For next child res under same bridge */ > + r->flags = old_flags; > } > > enum release_type { > @@ -2409,7 +2397,6 @@ int pci_reassign_bridge_resources(struct pci_dev *bridge, unsigned long type) > for (i = PCI_BRIDGE_RESOURCES; i < PCI_BRIDGE_RESOURCE_END; > i++) { > struct resource *res = &bridge->resource[i]; > - const char *res_name = pci_resource_name(bridge, i); > > if ((res->flags ^ type) & PCI_RES_TYPE_MASK) > continue; > @@ -2422,12 +2409,7 @@ int pci_reassign_bridge_resources(struct pci_dev *bridge, unsigned long type) > if (ret) > goto cleanup; > > - pci_info(bridge, "%s %pR: releasing\n", res_name, res); > - > - if (res->parent) > - release_resource(res); > - res->start = 0; > - res->end = 0; > + pci_release_resource(bridge, i); > break; > } > if (i == PCI_BRIDGE_RESOURCE_END) > diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c > index d2b3ed51e8804..0468c058b5987 100644 > --- a/drivers/pci/setup-res.c > +++ b/drivers/pci/setup-res.c > @@ -406,20 +406,25 @@ int pci_reassign_resource(struct pci_dev *dev, int resno, > return 0; > } > > -void pci_release_resource(struct pci_dev *dev, int resno) > +int pci_release_resource(struct pci_dev *dev, int resno) > { > struct resource *res = pci_resource_n(dev, resno); > const char *res_name = pci_resource_name(dev, resno); > + int ret; > > if (!res->parent) > - return; > + return 0; > > pci_info(dev, "%s %pR: releasing\n", res_name, res); > > - release_resource(res); > + ret = release_resource(res); > + if (ret) > + return ret; > res->end = resource_size(res) - 1; > res->start = 0; > res->flags |= IORESOURCE_UNSET; > + > + return 0; > } > EXPORT_SYMBOL(pci_release_resource); > > diff --git a/include/linux/pci.h b/include/linux/pci.h > index 59876de13860d..275df40587672 100644 > --- a/include/linux/pci.h > +++ b/include/linux/pci.h > @@ -1417,7 +1417,7 @@ void pci_reset_secondary_bus(struct pci_dev *dev); > void pcibios_reset_secondary_bus(struct pci_dev *dev); > void pci_update_resource(struct pci_dev *dev, int resno); > int __must_check pci_assign_resource(struct pci_dev *dev, int i); > -void pci_release_resource(struct pci_dev *dev, int resno); > +int pci_release_resource(struct pci_dev *dev, int resno); > static inline int pci_rebar_bytes_to_size(u64 bytes) > { > bytes = roundup_pow_of_two(bytes); >

3 weeks, 1 day

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FAILED: patch "[PATCH] mm/ksm: fix incorrect KSM counter handling in mm_struct" failed to apply to 6.1-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 6.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y git checkout FETCH_HEAD git cherry-pick -x 4d6fc29f36341d7795db1d1819b4c15fe9be7b23 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025101301-starring-gravel-336e@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 4d6fc29f36341d7795db1d1819b4c15fe9be7b23 Mon Sep 17 00:00:00 2001 From: Donet Tom <donettom(a)linux.ibm.com> Date: Wed, 24 Sep 2025 00:16:59 +0530 Subject: [PATCH] mm/ksm: fix incorrect KSM counter handling in mm_struct during fork Patch series "mm/ksm: Fix incorrect accounting of KSM counters during fork", v3. The first patch in this series fixes the incorrect accounting of KSM counters such as ksm_merging_pages, ksm_rmap_items, and the global ksm_zero_pages during fork. The following patch add a selftest to verify the ksm_merging_pages counter was updated correctly during fork. Test Results ============ Without the first patch ----------------------- # [RUN] test_fork_ksm_merging_page_count not ok 10 ksm_merging_page in child: 32 With the first patch -------------------- # [RUN] test_fork_ksm_merging_page_count ok 10 ksm_merging_pages is not inherited after fork This patch (of 2): Currently, the KSM-related counters in `mm_struct`, such as `ksm_merging_pages`, `ksm_rmap_items`, and `ksm_zero_pages`, are inherited by the child process during fork. This results in inconsistent accounting. When a process uses KSM, identical pages are merged and an rmap item is created for each merged page. The `ksm_merging_pages` and `ksm_rmap_items` counters are updated accordingly. However, after a fork, these counters are copied to the child while the corresponding rmap items are not. As a result, when the child later triggers an unmerge, there are no rmap items present in the child, so the counters remain stale, leading to incorrect accounting. A similar issue exists with `ksm_zero_pages`, which maintains both a global counter and a per-process counter. During fork, the per-process counter is inherited by the child, but the global counter is not incremented. Since the child also references zero pages, the global counter should be updated as well. Otherwise, during zero-page unmerge, both the global and per-process counters are decremented, causing the global counter to become inconsistent. To fix this, ksm_merging_pages and ksm_rmap_items are reset to 0 during fork, and the global ksm_zero_pages counter is updated with the per-process ksm_zero_pages value inherited by the child. This ensures that KSM statistics remain accurate and reflect the activity of each process correctly. Link: https://lkml.kernel.org/r/cover.1758648700.git.donettom@linux.ibm.com Link: https://lkml.kernel.org/r/7b9870eb67ccc0d79593940d9dbd4a0b39b5d396.17586487… Fixes: 7609385337a4 ("ksm: count ksm merging pages for each process") Fixes: cb4df4cae4f2 ("ksm: count allocated ksm rmap_items for each process") Fixes: e2942062e01d ("ksm: count all zero pages placed by KSM") Signed-off-by: Donet Tom <donettom(a)linux.ibm.com> Reviewed-by: Chengming Zhou <chengming.zhou(a)linux.dev> Acked-by: David Hildenbrand <david(a)redhat.com> Cc: Aboorva Devarajan <aboorvad(a)linux.ibm.com> Cc: David Hildenbrand <david(a)redhat.com> Cc: Donet Tom <donettom(a)linux.ibm.com> Cc: "Ritesh Harjani (IBM)" <ritesh.list(a)gmail.com> Cc: Wei Yang <richard.weiyang(a)gmail.com> Cc: xu xin <xu.xin16(a)zte.com.cn> Cc: <stable(a)vger.kernel.org> [6.6+] Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> diff --git a/include/linux/ksm.h b/include/linux/ksm.h index 22e67ca7cba3..067538fc4d58 100644 --- a/include/linux/ksm.h +++ b/include/linux/ksm.h @@ -56,8 +56,14 @@ static inline long mm_ksm_zero_pages(struct mm_struct *mm) static inline void ksm_fork(struct mm_struct *mm, struct mm_struct *oldmm) { /* Adding mm to ksm is best effort on fork. */ - if (mm_flags_test(MMF_VM_MERGEABLE, oldmm)) + if (mm_flags_test(MMF_VM_MERGEABLE, oldmm)) { + long nr_ksm_zero_pages = atomic_long_read(&mm->ksm_zero_pages); + + mm->ksm_merging_pages = 0; + mm->ksm_rmap_items = 0; + atomic_long_add(nr_ksm_zero_pages, &ksm_zero_pages); __ksm_enter(mm); + } } static inline int ksm_execve(struct mm_struct *mm)

3 weeks, 1 day

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FAILED: patch "[PATCH] tracing: Stop fortify-string from warning in" failed to apply to 5.10-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y git checkout FETCH_HEAD git cherry-pick -x 54b91e54b113d4f15ab023a44f508251db6e22e7 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025101336-mortality-parched-3105@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 54b91e54b113d4f15ab023a44f508251db6e22e7 Mon Sep 17 00:00:00 2001 From: Steven Rostedt <rostedt(a)goodmis.org> Date: Sat, 11 Oct 2025 11:20:32 -0400 Subject: [PATCH] tracing: Stop fortify-string from warning in tracing_mark_raw_write() The way tracing_mark_raw_write() records its data is that it has the following structure: struct { struct trace_entry; int id; char buf[]; }; But memcpy(&entry->id, buf, size) triggers the following warning when the size is greater than the id: ------------[ cut here ]------------ memcpy: detected field-spanning write (size 6) of single field "&entry->id" at kernel/trace/trace.c:7458 (size 4) WARNING: CPU: 7 PID: 995 at kernel/trace/trace.c:7458 write_raw_marker_to_buffer.isra.0+0x1f9/0x2e0 Modules linked in: CPU: 7 UID: 0 PID: 995 Comm: bash Not tainted 6.17.0-test-00007-g60b82183e78a-dirty #211 PREEMPT(voluntary) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.17.0-debian-1.17.0-1 04/01/2014 RIP: 0010:write_raw_marker_to_buffer.isra.0+0x1f9/0x2e0 Code: 04 00 75 a7 b9 04 00 00 00 48 89 de 48 89 04 24 48 c7 c2 e0 b1 d1 b2 48 c7 c7 40 b2 d1 b2 c6 05 2d 88 6a 04 01 e8 f7 e8 bd ff <0f> 0b 48 8b 04 24 e9 76 ff ff ff 49 8d 7c 24 04 49 8d 5c 24 08 48 RSP: 0018:ffff888104c3fc78 EFLAGS: 00010292 RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 1ffffffff6b363b4 RDI: 0000000000000001 RBP: ffff888100058a00 R08: ffffffffb041d459 R09: ffffed1020987f40 R10: 0000000000000007 R11: 0000000000000001 R12: ffff888100bb9010 R13: 0000000000000000 R14: 00000000000003e3 R15: ffff888134800000 FS: 00007fa61d286740(0000) GS:ffff888286cad000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000560d28d509f1 CR3: 00000001047a4006 CR4: 0000000000172ef0 Call Trace: <TASK> tracing_mark_raw_write+0x1fe/0x290 ? __pfx_tracing_mark_raw_write+0x10/0x10 ? security_file_permission+0x50/0xf0 ? rw_verify_area+0x6f/0x4b0 vfs_write+0x1d8/0xdd0 ? __pfx_vfs_write+0x10/0x10 ? __pfx_css_rstat_updated+0x10/0x10 ? count_memcg_events+0xd9/0x410 ? fdget_pos+0x53/0x5e0 ksys_write+0x182/0x200 ? __pfx_ksys_write+0x10/0x10 ? do_user_addr_fault+0x4af/0xa30 do_syscall_64+0x63/0x350 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7fa61d318687 Code: 48 89 fa 4c 89 df e8 58 b3 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffd87fe0120 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fa61d286740 RCX: 00007fa61d318687 RDX: 0000000000000006 RSI: 0000560d28d509f0 RDI: 0000000000000001 RBP: 0000560d28d509f0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000006 R13: 00007fa61d4715c0 R14: 00007fa61d46ee80 R15: 0000000000000000 </TASK> ---[ end trace 0000000000000000 ]--- This is because fortify string sees that the size of entry->id is only 4 bytes, but it is writing more than that. But this is OK as the dynamic_array is allocated to handle that copy. The size allocated on the ring buffer was actually a bit too big: size = sizeof(*entry) + cnt; But cnt includes the 'id' and the buffer data, so adding cnt to the size of *entry actually allocates too much on the ring buffer. Change the allocation to: size = struct_size(entry, buf, cnt - sizeof(entry->id)); and the memcpy() to unsafe_memcpy() with an added justification. Cc: stable(a)vger.kernel.org Cc: Masami Hiramatsu <mhiramat(a)kernel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers(a)efficios.com> Cc: Andrew Morton <akpm(a)linux-foundation.org> Link: https://lore.kernel.org/20251011112032.77be18e4@gandalf.local.home Fixes: 64cf7d058a00 ("tracing: Have trace_marker use per-cpu data to read user space") Reported-by: syzbot+9a2ede1643175f350105(a)syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/68e973f5.050a0220.1186a4.0010.GAE@google.com/ Signed-off-by: Steven Rostedt (Google) <rostedt(a)goodmis.org> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index bbb89206a891..eb256378e65b 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -7441,7 +7441,8 @@ static ssize_t write_raw_marker_to_buffer(struct trace_array *tr, ssize_t written; size_t size; - size = sizeof(*entry) + cnt; + /* cnt includes both the entry->id and the data behind it. */ + size = struct_size(entry, buf, cnt - sizeof(entry->id)); buffer = tr->array_buffer.buffer; @@ -7455,7 +7456,10 @@ static ssize_t write_raw_marker_to_buffer(struct trace_array *tr, return -EBADF; entry = ring_buffer_event_data(event); - memcpy(&entry->id, buf, cnt); + unsafe_memcpy(&entry->id, buf, cnt, + "id and content already reserved on ring buffer" + "'buf' includes the 'id' and the data." + "'entry' was allocated with cnt from 'id'."); written = cnt; __buffer_unlock_commit(buffer, event);

3 weeks, 1 day

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FAILED: patch "[PATCH] tracing: Stop fortify-string from warning in" failed to apply to 5.15-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x 54b91e54b113d4f15ab023a44f508251db6e22e7 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025101333-thieving-clanking-79c8@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 54b91e54b113d4f15ab023a44f508251db6e22e7 Mon Sep 17 00:00:00 2001 From: Steven Rostedt <rostedt(a)goodmis.org> Date: Sat, 11 Oct 2025 11:20:32 -0400 Subject: [PATCH] tracing: Stop fortify-string from warning in tracing_mark_raw_write() The way tracing_mark_raw_write() records its data is that it has the following structure: struct { struct trace_entry; int id; char buf[]; }; But memcpy(&entry->id, buf, size) triggers the following warning when the size is greater than the id: ------------[ cut here ]------------ memcpy: detected field-spanning write (size 6) of single field "&entry->id" at kernel/trace/trace.c:7458 (size 4) WARNING: CPU: 7 PID: 995 at kernel/trace/trace.c:7458 write_raw_marker_to_buffer.isra.0+0x1f9/0x2e0 Modules linked in: CPU: 7 UID: 0 PID: 995 Comm: bash Not tainted 6.17.0-test-00007-g60b82183e78a-dirty #211 PREEMPT(voluntary) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.17.0-debian-1.17.0-1 04/01/2014 RIP: 0010:write_raw_marker_to_buffer.isra.0+0x1f9/0x2e0 Code: 04 00 75 a7 b9 04 00 00 00 48 89 de 48 89 04 24 48 c7 c2 e0 b1 d1 b2 48 c7 c7 40 b2 d1 b2 c6 05 2d 88 6a 04 01 e8 f7 e8 bd ff <0f> 0b 48 8b 04 24 e9 76 ff ff ff 49 8d 7c 24 04 49 8d 5c 24 08 48 RSP: 0018:ffff888104c3fc78 EFLAGS: 00010292 RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 1ffffffff6b363b4 RDI: 0000000000000001 RBP: ffff888100058a00 R08: ffffffffb041d459 R09: ffffed1020987f40 R10: 0000000000000007 R11: 0000000000000001 R12: ffff888100bb9010 R13: 0000000000000000 R14: 00000000000003e3 R15: ffff888134800000 FS: 00007fa61d286740(0000) GS:ffff888286cad000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000560d28d509f1 CR3: 00000001047a4006 CR4: 0000000000172ef0 Call Trace: <TASK> tracing_mark_raw_write+0x1fe/0x290 ? __pfx_tracing_mark_raw_write+0x10/0x10 ? security_file_permission+0x50/0xf0 ? rw_verify_area+0x6f/0x4b0 vfs_write+0x1d8/0xdd0 ? __pfx_vfs_write+0x10/0x10 ? __pfx_css_rstat_updated+0x10/0x10 ? count_memcg_events+0xd9/0x410 ? fdget_pos+0x53/0x5e0 ksys_write+0x182/0x200 ? __pfx_ksys_write+0x10/0x10 ? do_user_addr_fault+0x4af/0xa30 do_syscall_64+0x63/0x350 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7fa61d318687 Code: 48 89 fa 4c 89 df e8 58 b3 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffd87fe0120 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fa61d286740 RCX: 00007fa61d318687 RDX: 0000000000000006 RSI: 0000560d28d509f0 RDI: 0000000000000001 RBP: 0000560d28d509f0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000006 R13: 00007fa61d4715c0 R14: 00007fa61d46ee80 R15: 0000000000000000 </TASK> ---[ end trace 0000000000000000 ]--- This is because fortify string sees that the size of entry->id is only 4 bytes, but it is writing more than that. But this is OK as the dynamic_array is allocated to handle that copy. The size allocated on the ring buffer was actually a bit too big: size = sizeof(*entry) + cnt; But cnt includes the 'id' and the buffer data, so adding cnt to the size of *entry actually allocates too much on the ring buffer. Change the allocation to: size = struct_size(entry, buf, cnt - sizeof(entry->id)); and the memcpy() to unsafe_memcpy() with an added justification. Cc: stable(a)vger.kernel.org Cc: Masami Hiramatsu <mhiramat(a)kernel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers(a)efficios.com> Cc: Andrew Morton <akpm(a)linux-foundation.org> Link: https://lore.kernel.org/20251011112032.77be18e4@gandalf.local.home Fixes: 64cf7d058a00 ("tracing: Have trace_marker use per-cpu data to read user space") Reported-by: syzbot+9a2ede1643175f350105(a)syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/68e973f5.050a0220.1186a4.0010.GAE@google.com/ Signed-off-by: Steven Rostedt (Google) <rostedt(a)goodmis.org> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index bbb89206a891..eb256378e65b 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -7441,7 +7441,8 @@ static ssize_t write_raw_marker_to_buffer(struct trace_array *tr, ssize_t written; size_t size; - size = sizeof(*entry) + cnt; + /* cnt includes both the entry->id and the data behind it. */ + size = struct_size(entry, buf, cnt - sizeof(entry->id)); buffer = tr->array_buffer.buffer; @@ -7455,7 +7456,10 @@ static ssize_t write_raw_marker_to_buffer(struct trace_array *tr, return -EBADF; entry = ring_buffer_event_data(event); - memcpy(&entry->id, buf, cnt); + unsafe_memcpy(&entry->id, buf, cnt, + "id and content already reserved on ring buffer" + "'buf' includes the 'id' and the data." + "'entry' was allocated with cnt from 'id'."); written = cnt; __buffer_unlock_commit(buffer, event);

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