CVE-2022-49383

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> watchdog: rzg2l_wdt: Fix &amp;#39;BUG: Invalid wait context&amp;#39;<br /> <br /> This patch fixes the issue &amp;#39;BUG: Invalid wait context&amp;#39; during restart()<br /> callback by using clk_prepare_enable() instead of pm_runtime_get_sync()<br /> for turning on the clocks during restart.<br /> <br /> This issue is noticed when testing with renesas_defconfig.<br /> <br /> [ 42.213802] reboot: Restarting system<br /> [ 42.217860]<br /> [ 42.219364] =============================<br /> [ 42.223368] [ BUG: Invalid wait context ]<br /> [ 42.227372] 5.17.0-rc5-arm64-renesas-00002-g10393723e35e #522 Not tainted<br /> [ 42.234153] -----------------------------<br /> [ 42.238155] systemd-shutdow/1 is trying to lock:<br /> [ 42.242766] ffff00000a650828 (&amp;genpd-&gt;mlock){+.+.}-{3:3}, at: genpd_lock_mtx+0x14/0x20<br /> [ 42.250709] other info that might help us debug this:<br /> [ 42.255753] context-{4:4}<br /> [ 42.258368] 2 locks held by systemd-shutdow/1:<br /> [ 42.262806] #0: ffff80000944e1c8 (system_transition_mutex#2){+.+.}-{3:3}, at: __do_sys_reboot+0xd0/0x250<br /> [ 42.272388] #1: ffff8000094c4e40 (rcu_read_lock){....}-{1:2}, at: atomic_notifier_call_chain+0x0/0x150<br /> [ 42.281795] stack backtrace:<br /> [ 42.284672] CPU: 0 PID: 1 Comm: systemd-shutdow Not tainted 5.17.0-rc5-arm64-renesas-00002-g10393723e35e #522<br /> [ 42.294577] Hardware name: Renesas SMARC EVK based on r9a07g044c2 (DT)<br /> [ 42.301096] Call trace:<br /> [ 42.303538] dump_backtrace+0xcc/0xd8<br /> [ 42.307203] show_stack+0x14/0x30<br /> [ 42.310517] dump_stack_lvl+0x88/0xb0<br /> [ 42.314180] dump_stack+0x14/0x2c<br /> [ 42.317492] __lock_acquire+0x1b24/0x1b50<br /> [ 42.321502] lock_acquire+0x120/0x3a8<br /> [ 42.325162] __mutex_lock+0x84/0x8f8<br /> [ 42.328737] mutex_lock_nested+0x30/0x58<br /> [ 42.332658] genpd_lock_mtx+0x14/0x20<br /> [ 42.336319] genpd_runtime_resume+0xc4/0x228<br /> [ 42.340587] __rpm_callback+0x44/0x170<br /> [ 42.344337] rpm_callback+0x64/0x70<br /> [ 42.347824] rpm_resume+0x4e0/0x6b8<br /> [ 42.351310] __pm_runtime_resume+0x50/0x78<br /> [ 42.355404] rzg2l_wdt_restart+0x28/0x68<br /> [ 42.359329] watchdog_restart_notifier+0x1c/0x30<br /> [ 42.363943] atomic_notifier_call_chain+0x94/0x150<br /> [ 42.368732] do_kernel_restart+0x24/0x30<br /> [ 42.372652] machine_restart+0x44/0x70<br /> [ 42.376399] kernel_restart+0x3c/0x60<br /> [ 42.380058] __do_sys_reboot+0x228/0x250<br /> [ 42.383977] __arm64_sys_reboot+0x20/0x28<br /> [ 42.387983] invoke_syscall+0x40/0xf8