4.19-stable patches

added patches:
	kprobes-fix-possible-use-after-free-issue-on-kprobe-registration.patch

diff --git a/queue-4.19/kprobes-fix-possible-use-after-free-issue-on-kprobe-registration.patch b/queue-4.19/kprobes-fix-possible-use-after-free-issue-on-kprobe-registration.patch
new file mode 100644 (file)
index 0000000..4337ba3
--- /dev/null
+++ b/queue-4.19/kprobes-fix-possible-use-after-free-issue-on-kprobe-registration.patch
@@ -0,0 +1,77 @@
+From 325f3fb551f8cd672dbbfc4cf58b14f9ee3fc9e8 Mon Sep 17 00:00:00 2001
+From: Zheng Yejian <zhengyejian1@huawei.com>
+Date: Wed, 10 Apr 2024 09:58:02 +0800
+Subject: kprobes: Fix possible use-after-free issue on kprobe registration
+
+From: Zheng Yejian <zhengyejian1@huawei.com>
+
+commit 325f3fb551f8cd672dbbfc4cf58b14f9ee3fc9e8 upstream.
+
+When unloading a module, its state is changing MODULE_STATE_LIVE ->
+ MODULE_STATE_GOING -> MODULE_STATE_UNFORMED. Each change will take
+a time. `is_module_text_address()` and `__module_text_address()`
+works with MODULE_STATE_LIVE and MODULE_STATE_GOING.
+If we use `is_module_text_address()` and `__module_text_address()`
+separately, there is a chance that the first one is succeeded but the
+next one is failed because module->state becomes MODULE_STATE_UNFORMED
+between those operations.
+
+In `check_kprobe_address_safe()`, if the second `__module_text_address()`
+is failed, that is ignored because it expected a kernel_text address.
+But it may have failed simply because module->state has been changed
+to MODULE_STATE_UNFORMED. In this case, arm_kprobe() will try to modify
+non-exist module text address (use-after-free).
+
+To fix this problem, we should not use separated `is_module_text_address()`
+and `__module_text_address()`, but use only `__module_text_address()`
+once and do `try_module_get(module)` which is only available with
+MODULE_STATE_LIVE.
+
+Link: https://lore.kernel.org/all/20240410015802.265220-1-zhengyejian1@huawei.com/
+
+Fixes: 28f6c37a2910 ("kprobes: Forbid probing on trampoline and BPF code areas")
+Cc: stable@vger.kernel.org
+Signed-off-by: Zheng Yejian <zhengyejian1@huawei.com>
+Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
+[Fix conflict due to lack dependency
+commit 223a76b268c9 ("kprobes: Fix coding style issues")]
+Signed-off-by: Zheng Yejian <zhengyejian1@huawei.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ kernel/kprobes.c |   18 ++++++++++++------
+ 1 file changed, 12 insertions(+), 6 deletions(-)
+
+--- a/kernel/kprobes.c
++++ b/kernel/kprobes.c
+@@ -1565,10 +1565,17 @@ static int check_kprobe_address_safe(str
+       jump_label_lock();
+       preempt_disable();
+ 
+-      /* Ensure it is not in reserved area nor out of text */
+-      if (!(core_kernel_text((unsigned long) p->addr) ||
+-          is_module_text_address((unsigned long) p->addr)) ||
+-          in_gate_area_no_mm((unsigned long) p->addr) ||
++      /* Ensure the address is in a text area, and find a module if exists. */
++      *probed_mod = NULL;
++      if (!core_kernel_text((unsigned long) p->addr)) {
++              *probed_mod = __module_text_address((unsigned long) p->addr);
++              if (!(*probed_mod)) {
++                      ret = -EINVAL;
++                      goto out;
++              }
++      }
++      /* Ensure it is not in reserved area. */
++      if (in_gate_area_no_mm((unsigned long) p->addr) ||
+           within_kprobe_blacklist((unsigned long) p->addr) ||
+           jump_label_text_reserved(p->addr, p->addr) ||
+           find_bug((unsigned long)p->addr)) {
+@@ -1576,8 +1583,7 @@ static int check_kprobe_address_safe(str
+               goto out;
+       }
+ 
+-      /* Check if are we probing a module */
+-      *probed_mod = __module_text_address((unsigned long) p->addr);
++      /* Get module refcount and reject __init functions for loaded modules. */
+       if (*probed_mod) {
+               /*
+                * We must hold a refcount of the probed module while updating

diff --git a/queue-4.19/series b/queue-4.19/series
index 7e823562d892dcdd704dcc56d1e628281fce45fe..4d989028b3a275b121492c2286c513e1806cd590 100644 (file)
--- a/queue-4.19/series
+++ b/queue-4.19/series
@@ -12,3 +12,4 @@ selftests-timers-fix-abs-warning-in-posix_timers-test.patch
 x86-apic-force-native_apic_mem_read-to-use-the-mov-instruction.patch
 btrfs-record-delayed-inode-root-in-transaction.patch
 selftests-ftrace-limit-length-in-subsystem-enable-tests.patch
+kprobes-fix-possible-use-after-free-issue-on-kprobe-registration.patch