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[PATCH OLK-5.10 0/3] CVE-2024-26661 following bugfix
by Liao Chen 21 Jun '24

21 Jun '24

In order to apply (drm/amd/display: Fix && vs || typos) in full, we revert it, merge its precedent, and apply it back. Dan Carpenter (1): drm/amd/display: Fix && vs || typos Liao Chen (1): Revert "drm/amd/display: Fix && vs || typos" Srinivasan Shanmugam (1): drm/amd/display: Fix 'panel_cntl' could be null in 'dcn21_set_backlight_level()' drivers/gpu/drm/amd/display/dc/dcn21/dcn21_hwseq.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) -- 2.34.1

2 4

[PATCH OLK-6.6] ftrace: Fix possible use-after-free issue in ftrace_location()
by Zheng Yejian 21 Jun '24

21 Jun '24

mainline inclusion from mainline-v6.10-rc1 commit e60b613df8b6253def41215402f72986fee3fc8d category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IA6S5H CVE: CVE-2024-38588 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… ------------------------------------------------------ KASAN reports a bug: BUG: KASAN: use-after-free in ftrace_location+0x90/0x120 Read of size 8 at addr ffff888141d40010 by task insmod/424 CPU: 8 PID: 424 Comm: insmod Tainted: G W 6.9.0-rc2+ [...] Call Trace: <TASK> dump_stack_lvl+0x68/0xa0 print_report+0xcf/0x610 kasan_report+0xb5/0xe0 ftrace_location+0x90/0x120 register_kprobe+0x14b/0xa40 kprobe_init+0x2d/0xff0 [kprobe_example] do_one_initcall+0x8f/0x2d0 do_init_module+0x13a/0x3c0 load_module+0x3082/0x33d0 init_module_from_file+0xd2/0x130 __x64_sys_finit_module+0x306/0x440 do_syscall_64+0x68/0x140 entry_SYSCALL_64_after_hwframe+0x71/0x79 The root cause is that, in lookup_rec(), ftrace record of some address is being searched in ftrace pages of some module, but those ftrace pages at the same time is being freed in ftrace_release_mod() as the corresponding module is being deleted: CPU1 | CPU2 register_kprobes() { | delete_module() { check_kprobe_address_safe() { | arch_check_ftrace_location() { | ftrace_location() { | lookup_rec() // USE! | ftrace_release_mod() // Free! To fix this issue: 1. Hold rcu lock as accessing ftrace pages in ftrace_location_range(); 2. Use ftrace_location_range() instead of lookup_rec() in ftrace_location(); 3. Call synchronize_rcu() before freeing any ftrace pages both in ftrace_process_locs()/ftrace_release_mod()/ftrace_free_mem(). Link: https://lore.kernel.org/linux-trace-kernel/20240509192859.1273558-1-zhengye… Cc: stable(a)vger.kernel.org Cc: <mhiramat(a)kernel.org> Cc: <mark.rutland(a)arm.com> Cc: <mathieu.desnoyers(a)efficios.com> Fixes: ae6aa16fdc16 ("kprobes: introduce ftrace based optimization") Suggested-by: Steven Rostedt <rostedt(a)goodmis.org> Signed-off-by: Zheng Yejian <zhengyejian1(a)huawei.com> Signed-off-by: Steven Rostedt (Google) <rostedt(a)goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Signed-off-by: Zheng Yejian <zhengyejian1(a)huawei.com> --- kernel/trace/ftrace.c | 39 +++++++++++++++++++++++---------------- 1 file changed, 23 insertions(+), 16 deletions(-) diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 83ba342aef31..2f80239348f5 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -1595,12 +1595,15 @@ static struct dyn_ftrace *lookup_rec(unsigned long start, unsigned long end) unsigned long ftrace_location_range(unsigned long start, unsigned long end) { struct dyn_ftrace *rec; + unsigned long ip = 0; + rcu_read_lock(); rec = lookup_rec(start, end); if (rec) - return rec->ip; + ip = rec->ip; + rcu_read_unlock(); - return 0; + return ip; } /** @@ -1613,25 +1616,22 @@ unsigned long ftrace_location_range(unsigned long start, unsigned long end) */ unsigned long ftrace_location(unsigned long ip) { - struct dyn_ftrace *rec; + unsigned long loc; unsigned long offset; unsigned long size; - rec = lookup_rec(ip, ip); - if (!rec) { + loc = ftrace_location_range(ip, ip); + if (!loc) { if (!kallsyms_lookup_size_offset(ip, &size, &offset)) goto out; /* map sym+0 to __fentry__ */ if (!offset) - rec = lookup_rec(ip, ip + size - 1); + loc = ftrace_location_range(ip, ip + size - 1); } - if (rec) - return rec->ip; - out: - return 0; + return loc; } /** @@ -6593,6 +6593,8 @@ static int ftrace_process_locs(struct module *mod, /* We should have used all pages unless we skipped some */ if (pg_unuse) { WARN_ON(!skipped); + /* Need to synchronize with ftrace_location_range() */ + synchronize_rcu(); ftrace_free_pages(pg_unuse); } return ret; @@ -6806,6 +6808,9 @@ void ftrace_release_mod(struct module *mod) out_unlock: mutex_unlock(&ftrace_lock); + /* Need to synchronize with ftrace_location_range() */ + if (tmp_page) + synchronize_rcu(); for (pg = tmp_page; pg; pg = tmp_page) { /* Needs to be called outside of ftrace_lock */ @@ -7139,6 +7144,7 @@ void ftrace_free_mem(struct module *mod, void *start_ptr, void *end_ptr) unsigned long start = (unsigned long)(start_ptr); unsigned long end = (unsigned long)(end_ptr); struct ftrace_page **last_pg = &ftrace_pages_start; + struct ftrace_page *tmp_page = NULL; struct ftrace_page *pg; struct dyn_ftrace *rec; struct dyn_ftrace key; @@ -7180,12 +7186,8 @@ void ftrace_free_mem(struct module *mod, void *start_ptr, void *end_ptr) ftrace_update_tot_cnt--; if (!pg->index) { *last_pg = pg->next; - if (pg->records) { - free_pages((unsigned long)pg->records, pg->order); - ftrace_number_of_pages -= 1 << pg->order; - } - ftrace_number_of_groups--; - kfree(pg); + pg->next = tmp_page; + tmp_page = pg; pg = container_of(last_pg, struct ftrace_page, next); if (!(*last_pg)) ftrace_pages = pg; @@ -7202,6 +7204,11 @@ void ftrace_free_mem(struct module *mod, void *start_ptr, void *end_ptr) clear_func_from_hashes(func); kfree(func); } + /* Need to synchronize with ftrace_location_range() */ + if (tmp_page) { + synchronize_rcu(); + ftrace_free_pages(tmp_page); + } } void __init ftrace_free_init_mem(void) -- 2.25.1

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[PATCH OLK-6.6] ring-buffer: Fix a race between readers and resize checks
by Zheng Yejian 21 Jun '24

21 Jun '24

From: Petr Pavlu <petr.pavlu(a)suse.com> mainline inclusion from mainline-v6.10-rc1 commit c2274b908db05529980ec056359fae916939fdaa category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IA6S8L CVE: CVE-2024-38601 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- The reader code in rb_get_reader_page() swaps a new reader page into the ring buffer by doing cmpxchg on old->list.prev->next to point it to the new page. Following that, if the operation is successful, old->list.next->prev gets updated too. This means the underlying doubly-linked list is temporarily inconsistent, page->prev->next or page->next->prev might not be equal back to page for some page in the ring buffer. The resize operation in ring_buffer_resize() can be invoked in parallel. It calls rb_check_pages() which can detect the described inconsistency and stop further tracing: [ 190.271762] ------------[ cut here ]------------ [ 190.271771] WARNING: CPU: 1 PID: 6186 at kernel/trace/ring_buffer.c:1467 rb_check_pages.isra.0+0x6a/0xa0 [ 190.271789] Modules linked in: [...] [ 190.271991] Unloaded tainted modules: intel_uncore_frequency(E):1 skx_edac(E):1 [ 190.272002] CPU: 1 PID: 6186 Comm: cmd.sh Kdump: loaded Tainted: G E 6.9.0-rc6-default #5 158d3e1e6d0b091c34c3b96bfd99a1c58306d79f [ 190.272011] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.0-0-gd239552c-rebuilt.opensuse.org 04/01/2014 [ 190.272015] RIP: 0010:rb_check_pages.isra.0+0x6a/0xa0 [ 190.272023] Code: [...] [ 190.272028] RSP: 0018:ffff9c37463abb70 EFLAGS: 00010206 [ 190.272034] RAX: ffff8eba04b6cb80 RBX: 0000000000000007 RCX: ffff8eba01f13d80 [ 190.272038] RDX: ffff8eba01f130c0 RSI: ffff8eba04b6cd00 RDI: ffff8eba0004c700 [ 190.272042] RBP: ffff8eba0004c700 R08: 0000000000010002 R09: 0000000000000000 [ 190.272045] R10: 00000000ffff7f52 R11: ffff8eba7f600000 R12: ffff8eba0004c720 [ 190.272049] R13: ffff8eba00223a00 R14: 0000000000000008 R15: ffff8eba067a8000 [ 190.272053] FS: 00007f1bd64752c0(0000) GS:ffff8eba7f680000(0000) knlGS:0000000000000000 [ 190.272057] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 190.272061] CR2: 00007f1bd6662590 CR3: 000000010291e001 CR4: 0000000000370ef0 [ 190.272070] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 190.272073] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 190.272077] Call Trace: [ 190.272098] <TASK> [ 190.272189] ring_buffer_resize+0x2ab/0x460 [ 190.272199] __tracing_resize_ring_buffer.part.0+0x23/0xa0 [ 190.272206] tracing_resize_ring_buffer+0x65/0x90 [ 190.272216] tracing_entries_write+0x74/0xc0 [ 190.272225] vfs_write+0xf5/0x420 [ 190.272248] ksys_write+0x67/0xe0 [ 190.272256] do_syscall_64+0x82/0x170 [ 190.272363] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 190.272373] RIP: 0033:0x7f1bd657d263 [ 190.272381] Code: [...] [ 190.272385] RSP: 002b:00007ffe72b643f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 190.272391] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f1bd657d263 [ 190.272395] RDX: 0000000000000002 RSI: 0000555a6eb538e0 RDI: 0000000000000001 [ 190.272398] RBP: 0000555a6eb538e0 R08: 000000000000000a R09: 0000000000000000 [ 190.272401] R10: 0000555a6eb55190 R11: 0000000000000246 R12: 00007f1bd6662500 [ 190.272404] R13: 0000000000000002 R14: 00007f1bd6667c00 R15: 0000000000000002 [ 190.272412] </TASK> [ 190.272414] ---[ end trace 0000000000000000 ]--- Note that ring_buffer_resize() calls rb_check_pages() only if the parent trace_buffer has recording disabled. Recent commit d78ab792705c ("tracing: Stop current tracer when resizing buffer") causes that it is now always the case which makes it more likely to experience this issue. The window to hit this race is nonetheless very small. To help reproducing it, one can add a delay loop in rb_get_reader_page(): ret = rb_head_page_replace(reader, cpu_buffer->reader_page); if (!ret) goto spin; for (unsigned i = 0; i < 1U << 26; i++) /* inserted delay loop */ __asm__ __volatile__ ("" : : : "memory"); rb_list_head(reader->list.next)->prev = &cpu_buffer->reader_page->list; .. and then run the following commands on the target system: echo 1 > /sys/kernel/tracing/events/sched/sched_switch/enable while true; do echo 16 > /sys/kernel/tracing/buffer_size_kb; sleep 0.1 echo 8 > /sys/kernel/tracing/buffer_size_kb; sleep 0.1 done & while true; do for i in /sys/kernel/tracing/per_cpu/*; do timeout 0.1 cat $i/trace_pipe; sleep 0.2 done done To fix the problem, make sure ring_buffer_resize() doesn't invoke rb_check_pages() concurrently with a reader operating on the same ring_buffer_per_cpu by taking its cpu_buffer->reader_lock. Link: https://lore.kernel.org/linux-trace-kernel/20240517134008.24529-3-petr.pavl… Cc: stable(a)vger.kernel.org Cc: Masami Hiramatsu <mhiramat(a)kernel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers(a)efficios.com> Fixes: 659f451ff213 ("ring-buffer: Add integrity check at end of iter read") Signed-off-by: Petr Pavlu <petr.pavlu(a)suse.com> [ Fixed whitespace ] Signed-off-by: Steven Rostedt (Google) <rostedt(a)goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Signed-off-by: Zheng Yejian <zhengyejian1(a)huawei.com> --- kernel/trace/ring_buffer.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 7b36e80fe27a..72884e8073b3 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -1599,6 +1599,11 @@ static void rb_check_bpage(struct ring_buffer_per_cpu *cpu_buffer, * * As a safety measure we check to make sure the data pages have not * been corrupted. + * + * Callers of this function need to guarantee that the list of pages doesn't get + * modified during the check. In particular, if it's possible that the function + * is invoked with concurrent readers which can swap in a new reader page then + * the caller should take cpu_buffer->reader_lock. */ static void rb_check_pages(struct ring_buffer_per_cpu *cpu_buffer) { @@ -2338,8 +2343,12 @@ int ring_buffer_resize(struct trace_buffer *buffer, unsigned long size, */ synchronize_rcu(); for_each_buffer_cpu(buffer, cpu) { + unsigned long flags; + cpu_buffer = buffer->buffers[cpu]; + raw_spin_lock_irqsave(&cpu_buffer->reader_lock, flags); rb_check_pages(cpu_buffer); + raw_spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags); } atomic_dec(&buffer->record_disabled); } -- 2.25.1

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[PATCH OLK-5.10 0/3] CVE-2024-26661 following bugfix
by Liao Chen 21 Jun '24

21 Jun '24

In order to apply (drm/amd/display: Fix && vs || typos) in full, we revert it, merge its precedent, and apply it back. Dan Carpenter (1): drm/amd/display: Fix && vs || typos Liao Chen (1): Revert "drm/amd/display: Fix && vs || typos" Srinivasan Shanmugam (1): drm/amd/display: Fix 'panel_cntl' could be null in 'dcn21_set_backlight_level()' drivers/gpu/drm/amd/display/dc/dcn21/dcn21_hwseq.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) -- 2.34.1

2 4

[PATCH OLK-6.6] of: module: add buffer overflow check in of_modalias()
by GONG, Ruiqi 21 Jun '24

21 Jun '24

From: Sergey Shtylyov <s.shtylyov(a)omp.ru> stable inclusion from stable-v6.6.33 commit 0b0d5701a8bf02f8fee037e81aacf6746558bfd6 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IA6SDQ CVE: CVE-2024-38541 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- [ Upstream commit cf7385cb26ac4f0ee6c7385960525ad534323252 ] In of_modalias(), if the buffer happens to be too small even for the 1st snprintf() call, the len parameter will become negative and str parameter (if not NULL initially) will point beyond the buffer's end. Add the buffer overflow check after the 1st snprintf() call and fix such check after the strlen() call (accounting for the terminating NUL char). Fixes: bc575064d688 ("of/device: use of_property_for_each_string to parse compatible strings") Signed-off-by: Sergey Shtylyov <s.shtylyov(a)omp.ru> Link: https://lore.kernel.org/r/bbfc6be0-c687-62b6-d015-5141b93f313e@omp.ru Signed-off-by: Rob Herring <robh(a)kernel.org> Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: GONG, Ruiqi <gongruiqi1(a)huawei.com> --- drivers/of/module.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/of/module.c b/drivers/of/module.c index f58e624953a2..780fd82a7ecc 100644 --- a/drivers/of/module.c +++ b/drivers/of/module.c @@ -29,14 +29,15 @@ ssize_t of_modalias(const struct device_node *np, char *str, ssize_t len) csize = snprintf(str, len, "of:N%pOFn%c%s", np, 'T', of_node_get_device_type(np)); tsize = csize; + if (csize >= len) + csize = len > 0 ? len - 1 : 0; len -= csize; - if (str) - str += csize; + str += csize; of_property_for_each_string(np, "compatible", p, compat) { csize = strlen(compat) + 1; tsize += csize; - if (csize > len) + if (csize >= len) continue; csize = snprintf(str, len, "C%s", compat); -- 2.25.1

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[PATCH openEuler-1.0-LTS 0/2] spi: Fix deadlock when adding
by Zeng Heng 21 Jun '24

21 Jun '24

Mark Brown (1): spi: Fix deadlock when adding SPI controllers on SPI buses Zeng Heng (1): spi: fix kabi breakage in struct spi_controller drivers/spi/spi.c | 43 ++++++++++++++++++++++++++---------------- include/linux/device.h | 8 ++++++++ 2 files changed, 35 insertions(+), 16 deletions(-) -- 2.25.1

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[PATCH OLK-5.10 0/4] CVE-2021-47599
by Yifan Qiao 21 Jun '24

21 Jun '24

Anand Jain (4): btrfs: convert latest_bdev type to btrfs_device and rename btrfs: use latest_dev in btrfs_show_devname btrfs: update latest_dev when we create a sprout device btrfs: remove stale comment about the btrfs_show_devname fs/btrfs/volumes.h | 6 +++++- fs/btrfs/disk-io.c | 6 +++--- fs/btrfs/extent_io.c | 2 +- fs/btrfs/inode.c | 2 +- fs/btrfs/super.c | 26 ++++++-------------------- fs/btrfs/volumes.c | 19 +++++++------------ 6 files changed, 23 insertions(+), 38 deletions(-) -- 2.39.2

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[PATCH openEuler-22.03-LTS-SP1 0/4] CVE-2021-47599
by Yifan Qiao 21 Jun '24

21 Jun '24

Anand Jain (4): btrfs: convert latest_bdev type to btrfs_device and rename btrfs: use latest_dev in btrfs_show_devname btrfs: update latest_dev when we create a sprout device btrfs: remove stale comment about the btrfs_show_devname fs/btrfs/volumes.h | 6 +++++- fs/btrfs/disk-io.c | 6 +++--- fs/btrfs/extent_io.c | 2 +- fs/btrfs/inode.c | 2 +- fs/btrfs/super.c | 26 ++++++-------------------- fs/btrfs/volumes.c | 19 +++++++------------ 6 files changed, 23 insertions(+), 38 deletions(-) -- 2.39.2

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[PATCH OLK-6.6 0/2] Port patches from OLK-5.10
by Zheng Yejian 21 Jun '24

21 Jun '24

Zheng Yejian (2): livepatch: Avoid patching conflicts with kprobes livepatch: Enable CONFIG_LIVEPATCH_ISOLATE_KPROBE in openeuler_defconfig arch/arm64/configs/openeuler_defconfig | 1 + arch/arm64/kernel/livepatch.c | 11 ++++ arch/x86/configs/openeuler_defconfig | 1 + arch/x86/kernel/livepatch.c | 18 ++++++ include/linux/kprobes.h | 8 +++ include/linux/livepatch.h | 13 ++++ kernel/kprobes.c | 25 +++++++- kernel/livepatch/Kconfig | 14 ++++ kernel/livepatch/core.c | 88 ++++++++++++++++++++++++++ 9 files changed, 178 insertions(+), 1 deletion(-) -- 2.25.1

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[openeuler:OLK-6.6 2514/10358] ld.lld: error: undefined symbol: sched_settag
by kernel test robot 21 Jun '24

21 Jun '24

tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: 79e1c0e468a9c6fa0ca8d1a329bbba9c40f4d84d commit: 34239429b1253e3d19cebf15277f46916519b1c2 [2514/10358] sched: programmable: Add user interface of task tag config: x86_64-randconfig-076-20240621 (https://download.01.org/0day-ci/archive/20240621/202406211329.ROMqS1XO-lkp@…) compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240621/202406211329.ROMqS1XO-lkp@…) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp(a)intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202406211329.ROMqS1XO-lkp@intel.com/ All errors (new ones prefixed by >>): >> ld.lld: error: undefined symbol: sched_settag >>> referenced by base.c:3697 (fs/proc/base.c:3697) >>> vmlinux.o:(pid_tag_write) -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki

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