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[PATCH OLK-5.10] netfilter: tproxy: bail out if IP has been disabled on the device
by Guo Mengqi 22 Aug '24

22 Aug '24

From: Florian Westphal <fw(a)strlen.de> stable inclusion from stable-v5.10.219 commit 07eeedafc59c45fe5de43958128542be3784764c category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IA7D8P CVE: CVE-2024-36270 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- [ Upstream commit 21a673bddc8fd4873c370caf9ae70ffc6d47e8d3 ] syzbot reports: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] [..] RIP: 0010:nf_tproxy_laddr4+0xb7/0x340 net/ipv4/netfilter/nf_tproxy_ipv4.c:62 Call Trace: nft_tproxy_eval_v4 net/netfilter/nft_tproxy.c:56 [inline] nft_tproxy_eval+0xa9a/0x1a00 net/netfilter/nft_tproxy.c:168 __in_dev_get_rcu() can return NULL, so check for this. Reported-and-tested-by: syzbot+b94a6818504ea90d7661(a)syzkaller.appspotmail.com Fixes: cc6eb4338569 ("tproxy: use the interface primary IP address as a default value for --on-ip") Signed-off-by: Florian Westphal <fw(a)strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo(a)netfilter.org> Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Wang Wensheng <wangwensheng4(a)huawei.com> --- net/ipv4/netfilter/nf_tproxy_ipv4.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/ipv4/netfilter/nf_tproxy_ipv4.c b/net/ipv4/netfilter/nf_tproxy_ipv4.c index 61cb2341f50f..7c1a0cd9f435 100644 --- a/net/ipv4/netfilter/nf_tproxy_ipv4.c +++ b/net/ipv4/netfilter/nf_tproxy_ipv4.c @@ -58,6 +58,8 @@ __be32 nf_tproxy_laddr4(struct sk_buff *skb, __be32 user_laddr, __be32 daddr) laddr = 0; indev = __in_dev_get_rcu(skb->dev); + if (!indev) + return daddr; in_dev_for_each_ifa_rcu(ifa, indev) { if (ifa->ifa_flags & IFA_F_SECONDARY) -- 2.17.1

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[PATCH openEuler-22.03-LTS-SP1] netfilter: tproxy: bail out if IP has been disabled on the device
by Guo Mengqi 22 Aug '24

22 Aug '24

From: Florian Westphal <fw(a)strlen.de> stable inclusion from stable-v5.10.219 commit 07eeedafc59c45fe5de43958128542be3784764c category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IA7D8P CVE: CVE-2024-36270 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- [ Upstream commit 21a673bddc8fd4873c370caf9ae70ffc6d47e8d3 ] syzbot reports: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] [..] RIP: 0010:nf_tproxy_laddr4+0xb7/0x340 net/ipv4/netfilter/nf_tproxy_ipv4.c:62 Call Trace: nft_tproxy_eval_v4 net/netfilter/nft_tproxy.c:56 [inline] nft_tproxy_eval+0xa9a/0x1a00 net/netfilter/nft_tproxy.c:168 __in_dev_get_rcu() can return NULL, so check for this. Reported-and-tested-by: syzbot+b94a6818504ea90d7661(a)syzkaller.appspotmail.com Fixes: cc6eb4338569 ("tproxy: use the interface primary IP address as a default value for --on-ip") Signed-off-by: Florian Westphal <fw(a)strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo(a)netfilter.org> Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Wang Wensheng <wangwensheng4(a)huawei.com> --- net/ipv4/netfilter/nf_tproxy_ipv4.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/ipv4/netfilter/nf_tproxy_ipv4.c b/net/ipv4/netfilter/nf_tproxy_ipv4.c index b2bae0b0e42a..20de70b75ad3 100644 --- a/net/ipv4/netfilter/nf_tproxy_ipv4.c +++ b/net/ipv4/netfilter/nf_tproxy_ipv4.c @@ -58,6 +58,8 @@ __be32 nf_tproxy_laddr4(struct sk_buff *skb, __be32 user_laddr, __be32 daddr) laddr = 0; indev = __in_dev_get_rcu(skb->dev); + if (!indev) + return daddr; in_dev_for_each_ifa_rcu(ifa, indev) { if (ifa->ifa_flags & IFA_F_SECONDARY) -- 2.17.1

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[PATCH openEuler-22.03-LTS-SP1 0/3] CVE-2024-36915
by Guo Mengqi 22 Aug '24

22 Aug '24

CVE-2024-36915 Eric Dumazet (3): mISDN: fix MISDN_TIME_STAMP handling net: add copy_safe_from_sockptr() helper nfc: llcp: fix nfc_llcp_setsockopt() unsafe copies drivers/isdn/mISDN/socket.c | 10 +++++----- include/linux/sockptr.h | 25 +++++++++++++++++++++++++ net/nfc/llcp_sock.c | 12 ++++++------ 3 files changed, 36 insertions(+), 11 deletions(-) -- 2.17.1

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[PATCH openEuler-1.0-LTS] filelock: Correct the filelock owner in fcntl_setlk/fcntl_setlk64
by Long Li 22 Aug '24

22 Aug '24

maillist inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IALNC4 CVE: NA Reference: https://lore.kernel.org/stable/20240816050627.2122228-1-leo.lilong@huawei.c… ---------------------------------------- The locks_remove_posix() function in fcntl_setlk/fcntl_setlk64 is designed to reliably remove locks when an fcntl/close race is detected. However, it was passing in the wrong filelock owner, it looks like a mistake and resulting in a failure to remove locks. More critically, if the lock removal fails, it could lead to a uaf issue while traversing the locks. This problem occurs only in the 4.19/5.4 stable version. Fixes: a561145f3ae9 ("filelock: Fix fcntl/close race recovery compat path") Fixes: d30ff3304083 ("filelock: Remove locks reliably when fcntl/close race is detected") Cc: stable(a)vger.kernel.org Signed-off-by: Long Li <leo.lilong(a)huawei.com> --- fs/locks.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/locks.c b/fs/locks.c index ae4b6d487985..ba9b7b7fd90a 100644 --- a/fs/locks.c +++ b/fs/locks.c @@ -2314,7 +2314,7 @@ int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd, f = fcheck(fd); spin_unlock(&current->files->file_lock); if (f != filp) { - locks_remove_posix(filp, &current->files); + locks_remove_posix(filp, current->files); error = -EBADF; } } @@ -2444,7 +2444,7 @@ int fcntl_setlk64(unsigned int fd, struct file *filp, unsigned int cmd, f = fcheck(fd); spin_unlock(&current->files->file_lock); if (f != filp) { - locks_remove_posix(filp, &current->files); + locks_remove_posix(filp, current->files); error = -EBADF; } } -- 2.39.2

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[PATCH openEuler-22.03-LTS-SP1] bpf: Fix a segment issue when downgrading gso_size
by Zhengchao Shao 22 Aug '24

22 Aug '24

From: Fred Li <dracodingfly(a)gmail.com> stable inclusion from stable-v5.10.224 commit dda518dea60d556a2d171c0122ca7d9fdb7d473a category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAKPRL CVE: CVE-2024-42281 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… --------------------------- [ Upstream commit fa5ef655615a01533035c6139248c5b33aa27028 ] Linearize the skb when downgrading gso_size because it may trigger a BUG_ON() later when the skb is segmented as described in [1,2]. Fixes: 2be7e212d5419 ("bpf: add bpf_skb_adjust_room helper") Signed-off-by: Fred Li <dracodingfly(a)gmail.com> Signed-off-by: Daniel Borkmann <daniel(a)iogearbox.net> Reviewed-by: Willem de Bruijn <willemb(a)google.com> Acked-by: Daniel Borkmann <daniel(a)iogearbox.net> Link: https://lore.kernel.org/all/20240626065555.35460-2-dracodingfly@gmail.com [1] Link: https://lore.kernel.org/all/668d5cf1ec330_1c18c32947@willemb.c.googlers.com… [2] Link: https://lore.kernel.org/bpf/20240719024653.77006-1-dracodingfly@gmail.com Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Zhengchao Shao <shaozhengchao(a)huawei.com> --- net/core/filter.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/net/core/filter.c b/net/core/filter.c index 012a5070a9e5..8a61914d35c5 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -3505,13 +3505,20 @@ static int bpf_skb_net_grow(struct sk_buff *skb, u32 off, u32 len_diff, if (skb_is_gso(skb)) { struct skb_shared_info *shinfo = skb_shinfo(skb); - /* Due to header grow, MSS needs to be downgraded. */ - if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) - skb_decrease_gso_size(shinfo, len_diff); - /* Header must be checked, and gso_segs recomputed. */ shinfo->gso_type |= gso_type; shinfo->gso_segs = 0; + + /* Due to header growth, MSS needs to be downgraded. + * There is a BUG_ON() when segmenting the frag_list with + * head_frag true, so linearize the skb after downgrading + * the MSS. + */ + if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) { + skb_decrease_gso_size(shinfo, len_diff); + if (shinfo->frag_list) + return skb_linearize(skb); + } } return 0; -- 2.34.1

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[PATCH OLK-5.10] bpf: Fix a segment issue when downgrading gso_size
by Zhengchao Shao 22 Aug '24

22 Aug '24

From: Fred Li <dracodingfly(a)gmail.com> stable inclusion from stable-v5.10.224 commit dda518dea60d556a2d171c0122ca7d9fdb7d473a category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAKPRL CVE: CVE-2024-42281 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… --------------------------- [ Upstream commit fa5ef655615a01533035c6139248c5b33aa27028 ] Linearize the skb when downgrading gso_size because it may trigger a BUG_ON() later when the skb is segmented as described in [1,2]. Fixes: 2be7e212d5419 ("bpf: add bpf_skb_adjust_room helper") Signed-off-by: Fred Li <dracodingfly(a)gmail.com> Signed-off-by: Daniel Borkmann <daniel(a)iogearbox.net> Reviewed-by: Willem de Bruijn <willemb(a)google.com> Acked-by: Daniel Borkmann <daniel(a)iogearbox.net> Link: https://lore.kernel.org/all/20240626065555.35460-2-dracodingfly@gmail.com [1] Link: https://lore.kernel.org/all/668d5cf1ec330_1c18c32947@willemb.c.googlers.com… [2] Link: https://lore.kernel.org/bpf/20240719024653.77006-1-dracodingfly@gmail.com Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Zhengchao Shao <shaozhengchao(a)huawei.com> --- net/core/filter.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/net/core/filter.c b/net/core/filter.c index 73973bb60197..9ef84e86b5c5 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -3532,13 +3532,20 @@ static int bpf_skb_net_grow(struct sk_buff *skb, u32 off, u32 len_diff, if (skb_is_gso(skb)) { struct skb_shared_info *shinfo = skb_shinfo(skb); - /* Due to header grow, MSS needs to be downgraded. */ - if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) - skb_decrease_gso_size(shinfo, len_diff); - /* Header must be checked, and gso_segs recomputed. */ shinfo->gso_type |= gso_type; shinfo->gso_segs = 0; + + /* Due to header growth, MSS needs to be downgraded. + * There is a BUG_ON() when segmenting the frag_list with + * head_frag true, so linearize the skb after downgrading + * the MSS. + */ + if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) { + skb_decrease_gso_size(shinfo, len_diff); + if (shinfo->frag_list) + return skb_linearize(skb); + } } return 0; -- 2.34.1

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[openeuler:OLK-5.10] BUILD SUCCESS 2a231005abe3471e02ef8c447d8ea1310b181ebb
by kernel test robot 22 Aug '24

22 Aug '24

tree/branch: https://gitee.com/openeuler/kernel.git OLK-5.10 branch HEAD: 2a231005abe3471e02ef8c447d8ea1310b181ebb !11012 hfsplus: fix uninit-value in copy_name elapsed time: 729m configs tested: 34 configs skipped: 127 The following configs have been built successfully. More configs may be tested in the coming days. tested configs: arm64 allmodconfig clang-20 arm64 allnoconfig gcc-14.1.0 arm64 randconfig-001-20240822 gcc-14.1.0 arm64 randconfig-002-20240822 gcc-14.1.0 arm64 randconfig-003-20240822 gcc-14.1.0 arm64 randconfig-004-20240822 clang-20 x86_64 allnoconfig clang-18 x86_64 allyesconfig clang-18 x86_64 buildonly-randconfig-001-20240821 gcc-12 x86_64 buildonly-randconfig-002-20240821 clang-18 x86_64 buildonly-randconfig-003-20240821 gcc-12 x86_64 buildonly-randconfig-004-20240821 gcc-12 x86_64 buildonly-randconfig-005-20240821 gcc-12 x86_64 buildonly-randconfig-006-20240821 gcc-12 x86_64 defconfig gcc-11 x86_64 randconfig-001-20240821 clang-18 x86_64 randconfig-002-20240821 gcc-12 x86_64 randconfig-003-20240821 clang-18 x86_64 randconfig-004-20240821 clang-18 x86_64 randconfig-005-20240821 clang-18 x86_64 randconfig-006-20240821 gcc-12 x86_64 randconfig-011-20240821 gcc-12 x86_64 randconfig-012-20240821 clang-18 x86_64 randconfig-013-20240821 clang-18 x86_64 randconfig-014-20240821 clang-18 x86_64 randconfig-015-20240821 gcc-12 x86_64 randconfig-016-20240821 clang-18 x86_64 randconfig-071-20240821 gcc-12 x86_64 randconfig-072-20240821 clang-18 x86_64 randconfig-073-20240821 gcc-12 x86_64 randconfig-074-20240821 clang-18 x86_64 randconfig-075-20240821 gcc-12 x86_64 randconfig-076-20240821 gcc-12 x86_64 rhel-8.3-rust clang-18 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki

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[openeuler:OLK-6.6] BUILD REGRESSION da3d113d5157468fcdfa7f7954c2d0704ba347fa
by kernel test robot 22 Aug '24

22 Aug '24

tree/branch: https://gitee.com/openeuler/kernel.git OLK-6.6 branch HEAD: da3d113d5157468fcdfa7f7954c2d0704ba347fa !11018 net: usb: qmi_wwan: fix memory leak for not ip packets Error/Warning ids grouped by kconfigs: recent_errors |-- arm64-allmodconfig | |-- arch-arm64-kvm-arm.c:warning:variable-r-is-used-uninitialized-whenever-if-condition-is-false | |-- arch-arm64-kvm-tmi.c:warning:no-previous-prototype-for-function-tmi_tmm_inf_test | |-- arch-arm64-kvm-virtcca_cvm.c:warning:no-previous-prototype-for-function-kvm_cvm_create_ttt_levels | |-- arch-arm64-kvm-virtcca_cvm.c:warning:no-previous-prototype-for-function-kvm_cvm_get_num_brps | |-- arch-arm64-kvm-virtcca_cvm.c:warning:no-previous-prototype-for-function-kvm_cvm_get_num_wrps | |-- arch-arm64-kvm-virtcca_cvm.c:warning:no-previous-prototype-for-function-kvm_cvm_ipa_limit | |-- arch-arm64-kvm-virtcca_cvm.c:warning:no-previous-prototype-for-function-kvm_cvm_populate_par_region | |-- arch-arm64-kvm-virtcca_cvm.c:warning:no-previous-prototype-for-function-kvm_cvm_supports_pmu | `-- arch-arm64-kvm-virtcca_cvm.c:warning:no-previous-prototype-for-function-kvm_cvm_supports_sve |-- x86_64-buildonly-randconfig-001-20240821 | `-- kernel-sched-isolation.c:error:setup_max_cpus-undeclared-(first-use-in-this-function) |-- x86_64-buildonly-randconfig-002-20240821 | |-- include-linux-psp-hygon.h:warning:no-previous-prototype-for-function-psp_register_cmd_notifier | |-- include-linux-psp-hygon.h:warning:no-previous-prototype-for-function-psp_unregister_cmd_notifier | |-- ld.lld:error:duplicate-symbol:psp_register_cmd_notifier | `-- ld.lld:error:duplicate-symbol:psp_unregister_cmd_notifier |-- x86_64-buildonly-randconfig-004-20240821 | `-- kernel-sched-isolation.c:error:setup_max_cpus-undeclared-(first-use-in-this-function) `-- x86_64-randconfig-006-20240821 |-- crypto-asymmetric_keys-pgp_public_key.c:undefined-reference-to-public_key_subtype |-- ld:crypto-asymmetric_keys-pgp_public_key.c:undefined-reference-to-public_key_free `-- ld:crypto-asymmetric_keys-pgp_public_key.c:undefined-reference-to-public_key_subtype elapsed time: 725m configs tested: 38 configs skipped: 123 tested configs: arm64 allmodconfig clang-20 arm64 allnoconfig gcc-14.1.0 arm64 randconfig-001-20240821 gcc-14.1.0 arm64 randconfig-002-20240821 gcc-14.1.0 arm64 randconfig-003-20240821 gcc-14.1.0 arm64 randconfig-004-20240821 clang-20 loongarch allmodconfig gcc-14.1.0 loongarch allnoconfig gcc-14.1.0 loongarch randconfig-001-20240821 gcc-14.1.0 loongarch randconfig-002-20240821 gcc-14.1.0 x86_64 allnoconfig clang-18 x86_64 allyesconfig clang-18 x86_64 buildonly-randconfig-001-20240821 gcc-12 x86_64 buildonly-randconfig-002-20240821 clang-18 x86_64 buildonly-randconfig-003-20240821 gcc-12 x86_64 buildonly-randconfig-004-20240821 gcc-12 x86_64 buildonly-randconfig-005-20240821 gcc-12 x86_64 buildonly-randconfig-006-20240821 gcc-12 x86_64 defconfig gcc-11 x86_64 randconfig-001-20240821 clang-18 x86_64 randconfig-002-20240821 gcc-12 x86_64 randconfig-003-20240821 clang-18 x86_64 randconfig-004-20240821 clang-18 x86_64 randconfig-005-20240821 clang-18 x86_64 randconfig-006-20240821 gcc-12 x86_64 randconfig-011-20240821 gcc-12 x86_64 randconfig-012-20240821 clang-18 x86_64 randconfig-013-20240821 clang-18 x86_64 randconfig-014-20240821 clang-18 x86_64 randconfig-015-20240821 gcc-12 x86_64 randconfig-016-20240821 clang-18 x86_64 randconfig-071-20240821 gcc-12 x86_64 randconfig-072-20240821 clang-18 x86_64 randconfig-073-20240821 gcc-12 x86_64 randconfig-074-20240821 clang-18 x86_64 randconfig-075-20240821 gcc-12 x86_64 randconfig-076-20240821 gcc-12 x86_64 rhel-8.3-rust clang-18 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki

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[openeuler:openEuler-1.0-LTS] BUILD SUCCESS db863d19ea30eb8b3a72f0cf83381ef9eebd0c68
by kernel test robot 22 Aug '24

22 Aug '24

tree/branch: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS branch HEAD: db863d19ea30eb8b3a72f0cf83381ef9eebd0c68 !10966 perf: Optimize perf_pmu_migrate_context() elapsed time: 793m configs tested: 34 configs skipped: 128 The following configs have been built successfully. More configs may be tested in the coming days. tested configs: arm64 allmodconfig gcc-14.1.0 arm64 allnoconfig gcc-14.1.0 arm64 randconfig-001-20240821 gcc-14.1.0 arm64 randconfig-002-20240821 gcc-14.1.0 arm64 randconfig-003-20240821 gcc-14.1.0 arm64 randconfig-004-20240821 gcc-14.1.0 x86_64 allnoconfig clang-18 x86_64 allyesconfig clang-18 x86_64 buildonly-randconfig-001-20240821 gcc-12 x86_64 buildonly-randconfig-002-20240821 clang-18 x86_64 buildonly-randconfig-003-20240821 gcc-12 x86_64 buildonly-randconfig-004-20240821 gcc-12 x86_64 buildonly-randconfig-005-20240821 gcc-12 x86_64 buildonly-randconfig-006-20240821 gcc-12 x86_64 defconfig gcc-11 x86_64 randconfig-001-20240821 clang-18 x86_64 randconfig-002-20240821 gcc-12 x86_64 randconfig-003-20240821 clang-18 x86_64 randconfig-004-20240821 clang-18 x86_64 randconfig-005-20240821 clang-18 x86_64 randconfig-006-20240821 gcc-12 x86_64 randconfig-011-20240821 gcc-12 x86_64 randconfig-012-20240821 clang-18 x86_64 randconfig-013-20240821 clang-18 x86_64 randconfig-014-20240821 clang-18 x86_64 randconfig-015-20240821 gcc-12 x86_64 randconfig-016-20240821 clang-18 x86_64 randconfig-071-20240821 gcc-12 x86_64 randconfig-072-20240821 clang-18 x86_64 randconfig-073-20240821 gcc-12 x86_64 randconfig-074-20240821 clang-18 x86_64 randconfig-075-20240821 gcc-12 x86_64 randconfig-076-20240821 gcc-12 x86_64 rhel-8.3-rust clang-18 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki

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[PATCH OLK-6.6 0/7] ext4: some bugfixs for large iomap&folio
by Zhihao Cheng 21 Aug '24

21 Aug '24

Darrick J. Wong (1): xfs: hoist multi-fsb allocation unit detection to a helper Zhang Yi (4): xfs: reserve blocks for truncating large realtime inode iomap: don't mark blocks uptodate after partial zeroing iomap: reduce unnecessary state_lock when setting ifs uptodate and dirty bits iomap: optimize setting uptodate bit Zhihao Cheng (2): ext4: ext4_iomap_map_blocks: Fix null pointer deference in nojournal mode iomap: improve iomap_folio_mkwrite_iter and ifs_clear_range_dirty fs/ext4/inode.c | 2 +- fs/iomap/buffered-io.c | 50 +++++++++++++++++++++++++++++++++++++----- fs/xfs/xfs_bmap_util.c | 4 ++-- fs/xfs/xfs_inode.h | 9 ++++++++ fs/xfs/xfs_iops.c | 15 ++++++++++++- 5 files changed, 70 insertions(+), 10 deletions(-) -- 2.31.1

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