July 2018 - Linux-stable-mirror

FAILED: patch "[PATCH] Btrfs: fix unexpected cow in run_delalloc_nocow" failed to apply to 4.4-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.4-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>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 5811375325420052fcadd944792a416a43072b7f Mon Sep 17 00:00:00 2001 From: Liu Bo <bo.li.liu(a)oracle.com> Date: Wed, 31 Jan 2018 17:09:13 -0700 Subject: [PATCH] Btrfs: fix unexpected cow in run_delalloc_nocow Fstests generic/475 provides a way to fail metadata reads while checking if checksum exists for the inode inside run_delalloc_nocow(), and csum_exist_in_range() interprets error (-EIO) as inode having checksum and makes its caller enter the cow path. In case of free space inode, this ends up with a warning in cow_file_range(). The same problem applies to btrfs_cross_ref_exist() since it may also read metadata in between. With this, run_delalloc_nocow() bails out when errors occur at the two places. cc: <stable(a)vger.kernel.org> v2.6.28+ Fixes: 17d217fe970d ("Btrfs: fix nodatasum handling in balancing code") Signed-off-by: Liu Bo <bo.li.liu(a)oracle.com> Signed-off-by: David Sterba <dsterba(a)suse.com> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 6504e63b2317..491a7397f6fa 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -1256,6 +1256,8 @@ static noinline int csum_exist_in_range(struct btrfs_fs_info *fs_info, list_del(&sums->list); kfree(sums); } + if (ret < 0) + return ret; return 1; } @@ -1388,10 +1390,23 @@ static noinline int run_delalloc_nocow(struct inode *inode, goto out_check; if (btrfs_extent_readonly(fs_info, disk_bytenr)) goto out_check; - if (btrfs_cross_ref_exist(root, ino, - found_key.offset - - extent_offset, disk_bytenr)) + ret = btrfs_cross_ref_exist(root, ino, + found_key.offset - + extent_offset, disk_bytenr); + if (ret) { + /* + * ret could be -EIO if the above fails to read + * metadata. + */ + if (ret < 0) { + if (cow_start != (u64)-1) + cur_offset = cow_start; + goto error; + } + + WARN_ON_ONCE(nolock); goto out_check; + } disk_bytenr += extent_offset; disk_bytenr += cur_offset - found_key.offset; num_bytes = min(end + 1, extent_end) - cur_offset; @@ -1409,10 +1424,22 @@ static noinline int run_delalloc_nocow(struct inode *inode, * this ensure that csum for a given extent are * either valid or do not exist. */ - if (csum_exist_in_range(fs_info, disk_bytenr, - num_bytes)) { + ret = csum_exist_in_range(fs_info, disk_bytenr, + num_bytes); + if (ret) { if (!nolock) btrfs_end_write_no_snapshotting(root); + + /* + * ret could be -EIO if the above fails to read + * metadata. + */ + if (ret < 0) { + if (cow_start != (u64)-1) + cur_offset = cow_start; + goto error; + } + WARN_ON_ONCE(nolock); goto out_check; } if (!btrfs_inc_nocow_writers(fs_info, disk_bytenr)) {

5 years, 10 months

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FAILED: patch "[PATCH] ACPI / LPSS: Add missing prv_offset setting for byt/cht PWM" failed to apply to 4.9-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.9-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>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From fdcb613d49321b5bf5d5a1bd0fba8e7c241dcc70 Mon Sep 17 00:00:00 2001 From: Hans de Goede <hdegoede(a)redhat.com> Date: Thu, 26 Apr 2018 14:10:24 +0200 Subject: [PATCH] ACPI / LPSS: Add missing prv_offset setting for byt/cht PWM devices The LPSS PWM device on on Bay Trail and Cherry Trail devices has a set of private registers at offset 0x800, the current lpss_device_desc for them already sets the LPSS_SAVE_CTX flag to have these saved/restored over device-suspend, but the current lpss_device_desc was not setting the prv_offset field, leading to the regular device registers getting saved/restored instead. This is causing the PWM controller to no longer work, resulting in a black screen, after a suspend/resume on systems where the firmware clears the APB clock and reset bits at offset 0x804. This commit fixes this by properly setting prv_offset to 0x800 for the PWM devices. Cc: stable(a)vger.kernel.org Fixes: e1c748179754 ("ACPI / LPSS: Add Intel BayTrail ACPI mode PWM") Fixes: 1bfbd8eb8a7f ("ACPI / LPSS: Add ACPI IDs for Intel Braswell") Signed-off-by: Hans de Goede <hdegoede(a)redhat.com> Acked-by: Rafael J . Wysocki <rjw(a)rjwysocki.net> Signed-off-by: Thierry Reding <thierry.reding(a)gmail.com> diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c index 2bcffec8dbf0..c4ba9164e582 100644 --- a/drivers/acpi/acpi_lpss.c +++ b/drivers/acpi/acpi_lpss.c @@ -229,11 +229,13 @@ static const struct lpss_device_desc lpt_sdio_dev_desc = { static const struct lpss_device_desc byt_pwm_dev_desc = { .flags = LPSS_SAVE_CTX, + .prv_offset = 0x800, .setup = byt_pwm_setup, }; static const struct lpss_device_desc bsw_pwm_dev_desc = { .flags = LPSS_SAVE_CTX | LPSS_NO_D3_DELAY, + .prv_offset = 0x800, .setup = bsw_pwm_setup, };

5 years, 10 months

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perf/x86/intel/uncore: Add event constraint for BDX PCU

by Jin, Yao

Subject of the patch: perf/x86/intel/uncore: Add event constraint for BDX PCU Commit id: bb9fbe1b57503f790dbbf9f06e72cb0fb9e60740 Wish to apply to: 4.14 Fix an issue on BDX. Thanks Jin Yao

5 years, 10 months

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perf vendor events: Add Goldmont Plus V1 event file to

by Jin, Yao

Subject of the patch: perf vendor events: Add Goldmont Plus V1 event file Commit id: 65db92e0965ab56e8031d5c804f26d5be0e47047 Wish to apply to: 4.14, 4.9, 4.4 Wish to support Goldmont Plus event since it's needed for some productions which run with stable kernel. Thanks Jin Yao

5 years, 10 months

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FAILED: patch "[PATCH] arm: dts: mt7623: fix invalid memory node being generated" failed to apply to 4.9-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.9-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>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From c0b0d540db1a8bfb041166c4991dd6f624e8de45 Mon Sep 17 00:00:00 2001 From: Sean Wang <sean.wang(a)mediatek.com> Date: Wed, 11 Apr 2018 16:53:56 +0800 Subject: [PATCH] arm: dts: mt7623: fix invalid memory node being generated Below two wrong nodes in existing DTS files would cause a fail boot since in fact the address 0 is not the correct place the memory device locates at. memory { device_type = "memory"; reg = <0x0 0x0 0x0 0x0>; }; memory@80000000 { reg = <0x0 0x80000000 0x0 0x40000000>; }; In order to avoid having a memory node starting at address 0, we can't include file skeleton64.dtsi and instead need to explicitly manually define a few of properties the DTS relies on such as #address-cells and #size-cells in root node and device_type in the node memory@80000000. Cc: stable(a)vger.kernel.org Fixes: 31ac0d69a1d4 ("ARM: dts: mediatek: add MT7623 basic support") Signed-off-by: Sean Wang <sean.wang(a)mediatek.com> Cc: Rob Herring <robh+dt(a)kernel.org> Signed-off-by: Matthias Brugger <matthias.bgg(a)gmail.com> diff --git a/arch/arm/boot/dts/mt7623.dtsi b/arch/arm/boot/dts/mt7623.dtsi index 68e987ddedc7..d4d04c365960 100644 --- a/arch/arm/boot/dts/mt7623.dtsi +++ b/arch/arm/boot/dts/mt7623.dtsi @@ -15,11 +15,12 @@ #include <dt-bindings/phy/phy.h> #include <dt-bindings/reset/mt2701-resets.h> #include <dt-bindings/thermal/thermal.h> -#include "skeleton64.dtsi" / { compatible = "mediatek,mt7623"; interrupt-parent = <&sysirq>; + #address-cells = <2>; + #size-cells = <2>; cpu_opp_table: opp-table { compatible = "operating-points-v2"; diff --git a/arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts b/arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts index bbf56f855e46..5938e4c79deb 100644 --- a/arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts +++ b/arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts @@ -109,6 +109,7 @@ }; memory@80000000 { + device_type = "memory"; reg = <0 0x80000000 0 0x40000000>; }; }; diff --git a/arch/arm/boot/dts/mt7623n-rfb.dtsi b/arch/arm/boot/dts/mt7623n-rfb.dtsi index a199ae78dd25..343e8efe5f25 100644 --- a/arch/arm/boot/dts/mt7623n-rfb.dtsi +++ b/arch/arm/boot/dts/mt7623n-rfb.dtsi @@ -40,6 +40,7 @@ }; memory@80000000 { + device_type = "memory"; reg = <0 0x80000000 0 0x40000000>; };

5 years, 10 months

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FAILED: patch "[PATCH] f2fs: don't use GFP_ZERO for page caches" failed to apply to 4.4-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.4-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>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 81114baa835b59ed02d14aa1d67f91ea874077cd Mon Sep 17 00:00:00 2001 From: Chao Yu <yuchao0(a)huawei.com> Date: Mon, 9 Apr 2018 20:25:06 +0800 Subject: [PATCH] f2fs: don't use GFP_ZERO for page caches Related to https://lkml.org/lkml/2018/4/8/661 Sometimes, we need to write meta data to new allocated block address, then we will allocate a zeroed page in inner inode's address space, and fill partial data in it, and leave other place with zero value which means some fields are initial status. There are two inner inodes (meta inode and node inode) setting __GFP_ZERO, I have just checked them, for both of them, we can avoid using __GFP_ZERO, and do initialization by ourselves to avoid unneeded/redundant zeroing from mm. Cc: <stable(a)vger.kernel.org> Signed-off-by: Chao Yu <yuchao0(a)huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk(a)kernel.org> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c index 3d3a1f6b21a1..8fc55d42ba25 100644 --- a/fs/f2fs/checkpoint.c +++ b/fs/f2fs/checkpoint.c @@ -100,8 +100,10 @@ repeat: * readonly and make sure do not write checkpoint with non-uptodate * meta page. */ - if (unlikely(!PageUptodate(page))) + if (unlikely(!PageUptodate(page))) { + memset(page_address(page), 0, PAGE_SIZE); f2fs_stop_checkpoint(sbi, false); + } out: return page; } diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c index 417c9dcd0269..87535bf63421 100644 --- a/fs/f2fs/inode.c +++ b/fs/f2fs/inode.c @@ -320,10 +320,10 @@ struct inode *f2fs_iget(struct super_block *sb, unsigned long ino) make_now: if (ino == F2FS_NODE_INO(sbi)) { inode->i_mapping->a_ops = &f2fs_node_aops; - mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO); + mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); } else if (ino == F2FS_META_INO(sbi)) { inode->i_mapping->a_ops = &f2fs_meta_aops; - mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO); + mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); } else if (S_ISREG(inode->i_mode)) { inode->i_op = &f2fs_file_inode_operations; inode->i_fop = &f2fs_file_operations; diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index a7ec952093f8..0fb006f591a4 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -1979,6 +1979,7 @@ static void write_current_sum_page(struct f2fs_sb_info *sbi, struct f2fs_summary_block *dst; dst = (struct f2fs_summary_block *)page_address(page); + memset(dst, 0, PAGE_SIZE); mutex_lock(&curseg->curseg_mutex); @@ -3133,6 +3134,7 @@ static void write_compacted_summaries(struct f2fs_sb_info *sbi, block_t blkaddr) page = grab_meta_page(sbi, blkaddr++); kaddr = (unsigned char *)page_address(page); + memset(kaddr, 0, PAGE_SIZE); /* Step 1: write nat cache */ seg_i = CURSEG_I(sbi, CURSEG_HOT_DATA); @@ -3157,6 +3159,7 @@ static void write_compacted_summaries(struct f2fs_sb_info *sbi, block_t blkaddr) if (!page) { page = grab_meta_page(sbi, blkaddr++); kaddr = (unsigned char *)page_address(page); + memset(kaddr, 0, PAGE_SIZE); written_size = 0; } summary = (struct f2fs_summary *)(kaddr + written_size); diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h index 3325d0769723..492ad0c86fa9 100644 --- a/fs/f2fs/segment.h +++ b/fs/f2fs/segment.h @@ -375,6 +375,7 @@ static inline void seg_info_to_sit_page(struct f2fs_sb_info *sbi, int i; raw_sit = (struct f2fs_sit_block *)page_address(page); + memset(raw_sit, 0, PAGE_SIZE); for (i = 0; i < end - start; i++) { rs = &raw_sit->entries[i]; se = get_seg_entry(sbi, start + i);

5 years, 10 months

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FAILED: patch "[PATCH] f2fs: don't use GFP_ZERO for page caches" failed to apply to 4.9-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.9-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>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 81114baa835b59ed02d14aa1d67f91ea874077cd Mon Sep 17 00:00:00 2001 From: Chao Yu <yuchao0(a)huawei.com> Date: Mon, 9 Apr 2018 20:25:06 +0800 Subject: [PATCH] f2fs: don't use GFP_ZERO for page caches Related to https://lkml.org/lkml/2018/4/8/661 Sometimes, we need to write meta data to new allocated block address, then we will allocate a zeroed page in inner inode's address space, and fill partial data in it, and leave other place with zero value which means some fields are initial status. There are two inner inodes (meta inode and node inode) setting __GFP_ZERO, I have just checked them, for both of them, we can avoid using __GFP_ZERO, and do initialization by ourselves to avoid unneeded/redundant zeroing from mm. Cc: <stable(a)vger.kernel.org> Signed-off-by: Chao Yu <yuchao0(a)huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk(a)kernel.org> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c index 3d3a1f6b21a1..8fc55d42ba25 100644 --- a/fs/f2fs/checkpoint.c +++ b/fs/f2fs/checkpoint.c @@ -100,8 +100,10 @@ repeat: * readonly and make sure do not write checkpoint with non-uptodate * meta page. */ - if (unlikely(!PageUptodate(page))) + if (unlikely(!PageUptodate(page))) { + memset(page_address(page), 0, PAGE_SIZE); f2fs_stop_checkpoint(sbi, false); + } out: return page; } diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c index 417c9dcd0269..87535bf63421 100644 --- a/fs/f2fs/inode.c +++ b/fs/f2fs/inode.c @@ -320,10 +320,10 @@ struct inode *f2fs_iget(struct super_block *sb, unsigned long ino) make_now: if (ino == F2FS_NODE_INO(sbi)) { inode->i_mapping->a_ops = &f2fs_node_aops; - mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO); + mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); } else if (ino == F2FS_META_INO(sbi)) { inode->i_mapping->a_ops = &f2fs_meta_aops; - mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO); + mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); } else if (S_ISREG(inode->i_mode)) { inode->i_op = &f2fs_file_inode_operations; inode->i_fop = &f2fs_file_operations; diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index a7ec952093f8..0fb006f591a4 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -1979,6 +1979,7 @@ static void write_current_sum_page(struct f2fs_sb_info *sbi, struct f2fs_summary_block *dst; dst = (struct f2fs_summary_block *)page_address(page); + memset(dst, 0, PAGE_SIZE); mutex_lock(&curseg->curseg_mutex); @@ -3133,6 +3134,7 @@ static void write_compacted_summaries(struct f2fs_sb_info *sbi, block_t blkaddr) page = grab_meta_page(sbi, blkaddr++); kaddr = (unsigned char *)page_address(page); + memset(kaddr, 0, PAGE_SIZE); /* Step 1: write nat cache */ seg_i = CURSEG_I(sbi, CURSEG_HOT_DATA); @@ -3157,6 +3159,7 @@ static void write_compacted_summaries(struct f2fs_sb_info *sbi, block_t blkaddr) if (!page) { page = grab_meta_page(sbi, blkaddr++); kaddr = (unsigned char *)page_address(page); + memset(kaddr, 0, PAGE_SIZE); written_size = 0; } summary = (struct f2fs_summary *)(kaddr + written_size); diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h index 3325d0769723..492ad0c86fa9 100644 --- a/fs/f2fs/segment.h +++ b/fs/f2fs/segment.h @@ -375,6 +375,7 @@ static inline void seg_info_to_sit_page(struct f2fs_sb_info *sbi, int i; raw_sit = (struct f2fs_sit_block *)page_address(page); + memset(raw_sit, 0, PAGE_SIZE); for (i = 0; i < end - start; i++) { rs = &raw_sit->entries[i]; se = get_seg_entry(sbi, start + i);

5 years, 10 months

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FAILED: patch "[PATCH] f2fs: don't use GFP_ZERO for page caches" failed to apply to 4.14-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.14-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>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 81114baa835b59ed02d14aa1d67f91ea874077cd Mon Sep 17 00:00:00 2001 From: Chao Yu <yuchao0(a)huawei.com> Date: Mon, 9 Apr 2018 20:25:06 +0800 Subject: [PATCH] f2fs: don't use GFP_ZERO for page caches Related to https://lkml.org/lkml/2018/4/8/661 Sometimes, we need to write meta data to new allocated block address, then we will allocate a zeroed page in inner inode's address space, and fill partial data in it, and leave other place with zero value which means some fields are initial status. There are two inner inodes (meta inode and node inode) setting __GFP_ZERO, I have just checked them, for both of them, we can avoid using __GFP_ZERO, and do initialization by ourselves to avoid unneeded/redundant zeroing from mm. Cc: <stable(a)vger.kernel.org> Signed-off-by: Chao Yu <yuchao0(a)huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk(a)kernel.org> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c index 3d3a1f6b21a1..8fc55d42ba25 100644 --- a/fs/f2fs/checkpoint.c +++ b/fs/f2fs/checkpoint.c @@ -100,8 +100,10 @@ repeat: * readonly and make sure do not write checkpoint with non-uptodate * meta page. */ - if (unlikely(!PageUptodate(page))) + if (unlikely(!PageUptodate(page))) { + memset(page_address(page), 0, PAGE_SIZE); f2fs_stop_checkpoint(sbi, false); + } out: return page; } diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c index 417c9dcd0269..87535bf63421 100644 --- a/fs/f2fs/inode.c +++ b/fs/f2fs/inode.c @@ -320,10 +320,10 @@ struct inode *f2fs_iget(struct super_block *sb, unsigned long ino) make_now: if (ino == F2FS_NODE_INO(sbi)) { inode->i_mapping->a_ops = &f2fs_node_aops; - mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO); + mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); } else if (ino == F2FS_META_INO(sbi)) { inode->i_mapping->a_ops = &f2fs_meta_aops; - mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO); + mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); } else if (S_ISREG(inode->i_mode)) { inode->i_op = &f2fs_file_inode_operations; inode->i_fop = &f2fs_file_operations; diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index a7ec952093f8..0fb006f591a4 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -1979,6 +1979,7 @@ static void write_current_sum_page(struct f2fs_sb_info *sbi, struct f2fs_summary_block *dst; dst = (struct f2fs_summary_block *)page_address(page); + memset(dst, 0, PAGE_SIZE); mutex_lock(&curseg->curseg_mutex); @@ -3133,6 +3134,7 @@ static void write_compacted_summaries(struct f2fs_sb_info *sbi, block_t blkaddr) page = grab_meta_page(sbi, blkaddr++); kaddr = (unsigned char *)page_address(page); + memset(kaddr, 0, PAGE_SIZE); /* Step 1: write nat cache */ seg_i = CURSEG_I(sbi, CURSEG_HOT_DATA); @@ -3157,6 +3159,7 @@ static void write_compacted_summaries(struct f2fs_sb_info *sbi, block_t blkaddr) if (!page) { page = grab_meta_page(sbi, blkaddr++); kaddr = (unsigned char *)page_address(page); + memset(kaddr, 0, PAGE_SIZE); written_size = 0; } summary = (struct f2fs_summary *)(kaddr + written_size); diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h index 3325d0769723..492ad0c86fa9 100644 --- a/fs/f2fs/segment.h +++ b/fs/f2fs/segment.h @@ -375,6 +375,7 @@ static inline void seg_info_to_sit_page(struct f2fs_sb_info *sbi, int i; raw_sit = (struct f2fs_sit_block *)page_address(page); + memset(raw_sit, 0, PAGE_SIZE); for (i = 0; i < end - start; i++) { rs = &raw_sit->entries[i]; se = get_seg_entry(sbi, start + i);

5 years, 10 months

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862591bf4("xfrm: skip policies marked as dead while rehashing")

by Zubin Mithra

Hello, Syzkaller has reported a crash here[1] for a slab OOB read in xfrm_hash_rebuild. Could the following 2 patches be applied in order to on 4.4.y? 6916fb3b10("xfrm: Ignore socket policies when rebuilding hash tables") 862591bf4f("xfrm: skip policies marked as dead while rehashing") [1] https://syzkaller.appspot.com/bug?id=1c11a638b7d27e871aa297f3b4d5fd5bc90f0c… Thanks, - Zubin

5 years, 10 months

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FAILED: patch "[PATCH] mm: fix __gup_device_huge vs unmap" failed to apply to 4.9-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.9-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>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From a9b6de77b1a3ff729f7bfc54b2e17711776a416c Mon Sep 17 00:00:00 2001 From: Dan Williams <dan.j.williams(a)intel.com> Date: Thu, 19 Apr 2018 21:32:19 -0700 Subject: [PATCH] mm: fix __gup_device_huge vs unmap get_user_pages_fast() for device pages is missing the typical validation that all page references have been taken while the mapping was valid. Without this validation truncate operations can not reliably coordinate against new page reference events like O_DIRECT. Cc: <stable(a)vger.kernel.org> Fixes: 3565fce3a659 ("mm, x86: get_user_pages() for dax mappings") Reported-by: Jan Kara <jack(a)suse.cz> Reviewed-by: Jan Kara <jack(a)suse.cz> Signed-off-by: Dan Williams <dan.j.williams(a)intel.com> diff --git a/mm/gup.c b/mm/gup.c index 76af4cfeaf68..84dd2063ca3d 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -1456,32 +1456,48 @@ static int __gup_device_huge(unsigned long pfn, unsigned long addr, return 1; } -static int __gup_device_huge_pmd(pmd_t pmd, unsigned long addr, +static int __gup_device_huge_pmd(pmd_t orig, pmd_t *pmdp, unsigned long addr, unsigned long end, struct page **pages, int *nr) { unsigned long fault_pfn; + int nr_start = *nr; + + fault_pfn = pmd_pfn(orig) + ((addr & ~PMD_MASK) >> PAGE_SHIFT); + if (!__gup_device_huge(fault_pfn, addr, end, pages, nr)) + return 0; - fault_pfn = pmd_pfn(pmd) + ((addr & ~PMD_MASK) >> PAGE_SHIFT); - return __gup_device_huge(fault_pfn, addr, end, pages, nr); + if (unlikely(pmd_val(orig) != pmd_val(*pmdp))) { + undo_dev_pagemap(nr, nr_start, pages); + return 0; + } + return 1; } -static int __gup_device_huge_pud(pud_t pud, unsigned long addr, +static int __gup_device_huge_pud(pud_t orig, pud_t *pudp, unsigned long addr, unsigned long end, struct page **pages, int *nr) { unsigned long fault_pfn; + int nr_start = *nr; + + fault_pfn = pud_pfn(orig) + ((addr & ~PUD_MASK) >> PAGE_SHIFT); + if (!__gup_device_huge(fault_pfn, addr, end, pages, nr)) + return 0; - fault_pfn = pud_pfn(pud) + ((addr & ~PUD_MASK) >> PAGE_SHIFT); - return __gup_device_huge(fault_pfn, addr, end, pages, nr); + if (unlikely(pud_val(orig) != pud_val(*pudp))) { + undo_dev_pagemap(nr, nr_start, pages); + return 0; + } + return 1; } #else -static int __gup_device_huge_pmd(pmd_t pmd, unsigned long addr, +static int __gup_device_huge_pmd(pmd_t orig, pmd_t *pmdp, unsigned long addr, unsigned long end, struct page **pages, int *nr) { BUILD_BUG(); return 0; } -static int __gup_device_huge_pud(pud_t pud, unsigned long addr, +static int __gup_device_huge_pud(pud_t pud, pud_t *pudp, unsigned long addr, unsigned long end, struct page **pages, int *nr) { BUILD_BUG(); @@ -1499,7 +1515,7 @@ static int gup_huge_pmd(pmd_t orig, pmd_t *pmdp, unsigned long addr, return 0; if (pmd_devmap(orig)) - return __gup_device_huge_pmd(orig, addr, end, pages, nr); + return __gup_device_huge_pmd(orig, pmdp, addr, end, pages, nr); refs = 0; page = pmd_page(orig) + ((addr & ~PMD_MASK) >> PAGE_SHIFT); @@ -1537,7 +1553,7 @@ static int gup_huge_pud(pud_t orig, pud_t *pudp, unsigned long addr, return 0; if (pud_devmap(orig)) - return __gup_device_huge_pud(orig, addr, end, pages, nr); + return __gup_device_huge_pud(orig, pudp, addr, end, pages, nr); refs = 0; page = pud_page(orig) + ((addr & ~PUD_MASK) >> PAGE_SHIFT);

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Linux-stable-mirror July 2018