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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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fe38d8553c
i386 CPU init code accesses freed init memory when booting a newly-started
processor after CPU hotplug. The cpu_devs array is searched to find the
vendor and it contains pointers to freed data.
Fix that by:
1. Zeroing entries for freed vendor data after bootup.
2. Changing Transmeta, NSC and UMC to all __init[data].
3. Printing a warning (once only) and setting this_cpu
to a safe default when the vendor is not found.
This does not change behavior for AMD systems. They were broken already
but no error was reported.
Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
42 lines
741 B
C
42 lines
741 B
C
#include <linux/kernel.h>
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#include <linux/init.h>
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#include <asm/processor.h>
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#include "cpu.h"
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/* UMC chips appear to be only either 386 or 486, so no special init takes place.
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*/
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static void __init init_umc(struct cpuinfo_x86 * c)
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{
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}
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static struct cpu_dev umc_cpu_dev __initdata = {
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.c_vendor = "UMC",
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.c_ident = { "UMC UMC UMC" },
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.c_models = {
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{ .vendor = X86_VENDOR_UMC, .family = 4, .model_names =
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{
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[1] = "U5D",
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[2] = "U5S",
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}
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},
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},
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.c_init = init_umc,
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};
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int __init umc_init_cpu(void)
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{
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cpu_devs[X86_VENDOR_UMC] = &umc_cpu_dev;
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return 0;
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}
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//early_arch_initcall(umc_init_cpu);
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static int __init umc_exit_cpu(void)
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{
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cpu_devs[X86_VENDOR_UMC] = NULL;
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return 0;
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}
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late_initcall(umc_exit_cpu);
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