[PATCH] stack overflow safe kdump: safe_smp_processor_id()
This is a the first of a series of patch-sets aiming at making kdump more robust against stack overflows. This patch set does the following: * Add safe_smp_processor_id function to i386 architecture (this function was inspired by the x86_64 function of the same name). * Substitute "smp_processor_id" with the stack overflow-safe "safe_smp_processor_id" in the reboot path to the second kernel. This patch: On the event of a stack overflow critical data that usually resides at the bottom of the stack is likely to be stomped and, consequently, its use should be avoided. In particular, in the i386 and IA64 architectures the macro smp_processor_id ultimately makes use of the "cpu" member of struct thread_info which resides at the bottom of the stack. x86_64, on the other hand, is not affected by this problem because it benefits from the use of the PDA infrastructure. To circumvent this problem I suggest implementing "safe_smp_processor_id()" (it already exists in x86_64) for i386 and IA64 and use it as a replacement for smp_processor_id in the reboot path to the dump capture kernel. This is a possible implementation for i386. Signed-off-by: Fernando Vazquez <fernando@intellilink.co.jp> Looks-reasonable-to: Andi Kleen <ak@muc.de> Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Vivek Goyal <vgoyal@in.ibm.com> Cc: James Bottomley <James.Bottomley@steeleye.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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2 changed files with 29 additions and 0 deletions
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@ -700,3 +700,30 @@ int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
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return 0;
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return 0;
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}
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}
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EXPORT_SYMBOL(smp_call_function_single);
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EXPORT_SYMBOL(smp_call_function_single);
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static int convert_apicid_to_cpu(int apic_id)
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{
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int i;
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for (i = 0; i < NR_CPUS; i++) {
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if (x86_cpu_to_apicid[i] == apic_id)
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return i;
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}
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return -1;
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}
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int safe_smp_processor_id(void)
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{
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int apicid, cpuid;
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if (!boot_cpu_has(X86_FEATURE_APIC))
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return 0;
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apicid = hard_smp_processor_id();
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if (apicid == BAD_APICID)
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return 0;
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cpuid = convert_apicid_to_cpu(apicid);
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return cpuid >= 0 ? cpuid : 0;
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}
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@ -84,6 +84,7 @@ static inline int hard_smp_processor_id(void)
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#endif
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#endif
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#endif
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#endif
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extern int safe_smp_processor_id(void);
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extern int __cpu_disable(void);
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extern int __cpu_disable(void);
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extern void __cpu_die(unsigned int cpu);
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extern void __cpu_die(unsigned int cpu);
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extern unsigned int num_processors;
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extern unsigned int num_processors;
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@ -92,6 +93,7 @@ extern unsigned int num_processors;
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#else /* CONFIG_SMP */
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#else /* CONFIG_SMP */
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#define safe_smp_processor_id() 0
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#define cpu_physical_id(cpu) boot_cpu_physical_apicid
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#define cpu_physical_id(cpu) boot_cpu_physical_apicid
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#define NO_PROC_ID 0xFF /* No processor magic marker */
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#define NO_PROC_ID 0xFF /* No processor magic marker */
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