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		"aggregate_severity":{
			"namespace":"https://nvd.nist.gov/vuln-metrics/cvss",
			"text":"MEDIUM"
		},
		"category":"csaf_vex",
		"csaf_version":"2.0",
		"distribution":{
			"tlp":{
				"label":"WHITE",
				"url":"https:/www.first.org/tlp/"
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		"lang":"en",
		"notes":[
			{
				"text":"In the Linux kernel, the following vulnerability has been resolved:MIPS: smp: fill in sibling and core maps earlierAfter enabling CONFIG_SCHED_CORE (landed during 5.14 cycle),2-core 2-thread-per-core interAptiv (CPS-driven) started emittingthe following:[    0.025698] CPU1 revision is: 0001a120 (MIPS interAptiv (multi))[    0.048183] ------------[ cut here ]------------[    0.048187] WARNING: CPU: 1 PID: 0 at kernel/sched/core.c:6025 sched_core_cpu_starting+0x198/0x240[    0.048220] Modules linked in:[    0.048233] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.17.0-rc3+ #35 b7b319f24073fd9a3c2aa7ad15fb7993eec0b26f[    0.048247] Stack : 817f0000 00000004 327804c8 810eb050 00000000 00000004 00000000 c314fdd1[    0.048278]         830cbd64 819c0000 81800000 817f0000 83070bf4 00000001 830cbd08 00000000[    0.048307]         00000000 00000000 815fcbc4 00000000 00000000 00000000 00000000 00000000[    0.048334]         00000000 00000000 00000000 00000000 817f0000 00000000 00000000 817f6f34[    0.048361]         817f0000 818a3c00 817f0000 00000004 00000000 00000000 4dc33260 0018c933[    0.048389]         ...[    0.048396] Call Trace:[    0.048399] [<8105a7bc>] show_stack+0x3c/0x140[    0.048424] [<8131c2a0>] dump_stack_lvl+0x60/0x80[    0.048440] [<8108b5c0>] __warn+0xc0/0xf4[    0.048454] [<8108b658>] warn_slowpath_fmt+0x64/0x10c[    0.048467] [<810bd418>] sched_core_cpu_starting+0x198/0x240[    0.048483] [<810c6514>] sched_cpu_starting+0x14/0x80[    0.048497] [<8108c0f8>] cpuhp_invoke_callback_range+0x78/0x140[    0.048510] [<8108d914>] notify_cpu_starting+0x94/0x140[    0.048523] [<8106593c>] start_secondary+0xbc/0x280[    0.048539][    0.048543] ---[ end trace 0000000000000000 ]---[    0.048636] Synchronize counters for CPU 1: done....for each but CPU 0/boot.Basic debug printks right before the mentioned line say:[    0.048170] CPU: 1, smt_mask:So smt_mask, which is sibling mask obviously, is empty when enteringthe function.This is critical, as sched_core_cpu_starting() calculatescore-scheduling parameters only once per CPU start, and it s crucialto have all the parameters filled in at that moment (at least ituses cpu_smt_mask() which in fact is `&cpu_sibling_map[cpu]` onMIPS).A bit of debugging led me to that set_cpu_sibling_map() performingthe actual map calculation, was being invocated afternotify_cpu_start(), and exactly the latter function starts CPU HPcallback round (sched_core_cpu_starting() is basically a CPU HPcallback).While the flow is same on ARM64 (maps after the notifier, althoughbefore calling set_cpu_online()), x86 started calculating siblingmaps earlier than starting the CPU HP callbacks in Linux 4.14 (see[0] for the reference). Neither me nor my brief tests couldn t findany potential caveats in calculating the maps right after performingdelay calibration, but the WARN splat is now gone.The very same debug prints now yield exactly what I expected fromthem:[    0.048433] CPU: 1, smt_mask: 0-1[0] https://git.kernel.org/pub/scm/linux/kernel/git/mips/linux.git/commit/?id=76ce7cfe35ef",
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				"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-48845"
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	"vulnerabilities":[
		{
			"cve":"CVE-2022-48845",
			"notes":[
				{
					"text":"In the Linux kernel, the following vulnerability has been resolved:MIPS: smp: fill in sibling and core maps earlierAfter enabling CONFIG_SCHED_CORE (landed during 5.14 cycle),2-core 2-thread-per-core interAptiv (CPS-driven) started emittingthe following:[    0.025698] CPU1 revision is: 0001a120 (MIPS interAptiv (multi))[    0.048183] ------------[ cut here ]------------[    0.048187] WARNING: CPU: 1 PID: 0 at kernel/sched/core.c:6025 sched_core_cpu_starting+0x198/0x240[    0.048220] Modules linked in:[    0.048233] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.17.0-rc3+ #35 b7b319f24073fd9a3c2aa7ad15fb7993eec0b26f[    0.048247] Stack : 817f0000 00000004 327804c8 810eb050 00000000 00000004 00000000 c314fdd1[    0.048278]         830cbd64 819c0000 81800000 817f0000 83070bf4 00000001 830cbd08 00000000[    0.048307]         00000000 00000000 815fcbc4 00000000 00000000 00000000 00000000 00000000[    0.048334]         00000000 00000000 00000000 00000000 817f0000 00000000 00000000 817f6f34[    0.048361]         817f0000 818a3c00 817f0000 00000004 00000000 00000000 4dc33260 0018c933[    0.048389]         ...[    0.048396] Call Trace:[    0.048399] [<8105a7bc>] show_stack+0x3c/0x140[    0.048424] [<8131c2a0>] dump_stack_lvl+0x60/0x80[    0.048440] [<8108b5c0>] __warn+0xc0/0xf4[    0.048454] [<8108b658>] warn_slowpath_fmt+0x64/0x10c[    0.048467] [<810bd418>] sched_core_cpu_starting+0x198/0x240[    0.048483] [<810c6514>] sched_cpu_starting+0x14/0x80[    0.048497] [<8108c0f8>] cpuhp_invoke_callback_range+0x78/0x140[    0.048510] [<8108d914>] notify_cpu_starting+0x94/0x140[    0.048523] [<8106593c>] start_secondary+0xbc/0x280[    0.048539][    0.048543] ---[ end trace 0000000000000000 ]---[    0.048636] Synchronize counters for CPU 1: done....for each but CPU 0/boot.Basic debug printks right before the mentioned line say:[    0.048170] CPU: 1, smt_mask:So smt_mask, which is sibling mask obviously, is empty when enteringthe function.This is critical, as sched_core_cpu_starting() calculatescore-scheduling parameters only once per CPU start, and it s crucialto have all the parameters filled in at that moment (at least ituses cpu_smt_mask() which in fact is `&cpu_sibling_map[cpu]` onMIPS).A bit of debugging led me to that set_cpu_sibling_map() performingthe actual map calculation, was being invocated afternotify_cpu_start(), and exactly the latter function starts CPU HPcallback round (sched_core_cpu_starting() is basically a CPU HPcallback).While the flow is same on ARM64 (maps after the notifier, althoughbefore calling set_cpu_online()), x86 started calculating siblingmaps earlier than starting the CPU HP callbacks in Linux 4.14 (see[0] for the reference). Neither me nor my brief tests couldn t findany potential caveats in calculating the maps right after performingdelay calibration, but the WARN splat is now gone.The very same debug prints now yield exactly what I expected fromthem:[    0.048433] CPU: 1, smt_mask: 0-1[0] https://git.kernel.org/pub/scm/linux/kernel/git/mips/linux.git/commit/?id=76ce7cfe35ef",
					"category":"description",
					"title":"Vulnerability Description"
				}
			],
			"product_status":{
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					],
					"details":"kernel security update",
					"category":"vendor_fix",
					"url":"https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2024-1944"
				}
			],
			"scores":[
				{
					"cvss_v3":{
						"baseSeverity":"MEDIUM",
						"baseScore":5.5,
						"vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
						"version":"3.1"
					},
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			],
			"threats":[
				{
					"details":"Medium",
					"category":"impact"
				}
			],
			"title":"CVE-2022-48845"
		}
	]
}