mcctrl: lookup unexported symbols at runtime
Instead of parsing System.map, use kallsyms_lookup_name() to get unexported symbols addresses at module loading time. This lets mckernel work with kaslr enabled (it gets enabled by default from el7.5 onwards) Change-Id: Ie4349fc1145ebce44f37f1f40c16f9d75584074d
This commit is contained in:
Dominique Martinet
committed by
Masamichi Takagi
Masamichi Takagi
parent
794684985f
commit
e8f8660b73
@ -1,6 +1,7 @@
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/* archdeps.c COPYRIGHT FUJITSU LIMITED 2016 */
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#include <linux/version.h>
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#include <linux/mm_types.h>
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#include <linux/kallsyms.h>
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#include <asm/vdso.h>
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#include "../../../config.h"
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#include "../../mcctrl.h"
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@ -17,29 +18,31 @@
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#define D(fmt, ...) printk("%s(%d) " fmt, __func__, __LINE__, ##__VA_ARGS__)
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#ifdef MCCTRL_KSYM_vdso_start
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# if MCCTRL_KSYM_vdso_start
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void *vdso_start = (void *)MCCTRL_KSYM_vdso_start;
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# endif
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#else
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# error missing address of vdso_start.
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 0, 0)
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void *vdso_start;
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void *vdso_end;
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static struct vm_special_mapping (*vdso_spec)[2];
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#endif
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#ifdef MCCTRL_KSYM_vdso_end
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# if MCCTRL_KSYM_vdso_end
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void *vdso_end = (void *)MCCTRL_KSYM_vdso_end;
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# endif
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#else
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# error missing address of vdso_end.
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int arch_symbols_init(void)
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{
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 0, 0)
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vdso_start = (void *) kallsyms_lookup_name("vdso_start");
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if (WARN_ON(!vdso_start))
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return -EFAULT;
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vdso_end = (void *) kallsyms_lookup_name("vdso_end");
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if (WARN_ON(!vdso_end))
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return -EFAULT;
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vdso_spec = (void *) kallsyms_lookup_name("vdso_spec");
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if (WARN_ON(!vdso_spec))
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return -EFAULT;
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#endif
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#ifdef MCCTRL_KSYM_vdso_spec
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# if MCCTRL_KSYM_vdso_spec
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static struct vm_special_mapping (*vdso_spec)[2] = (void*)MCCTRL_KSYM_vdso_spec;
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# endif
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#else
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# error missing address of vdso_spec.
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#endif
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return 0;
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}
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#ifdef POSTK_DEBUG_ARCH_DEP_52
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#define VDSO_MAXPAGES 1
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@ -1,5 +1,6 @@
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/* archdeps.c COPYRIGHT FUJITSU LIMITED 2016 */
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#include <linux/version.h>
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#include <linux/kallsyms.h>
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#include "../../../config.h"
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#include "../../mcctrl.h"
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@ -13,57 +14,46 @@
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#endif
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#endif /* POSTK_DEBUG_ARCH_DEP_83 */
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#ifdef MCCTRL_KSYM_vdso_image_64
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#if MCCTRL_KSYM_vdso_image_64
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struct vdso_image *vdso_image = (void *)MCCTRL_KSYM_vdso_image_64;
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 16, 0)
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static struct vdso_image *vdso_image_64;
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#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23)
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static void *vdso_start;
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static void *vdso_end;
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static struct page **vdso_pages;
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#endif
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static void *__vvar_page;
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static long *hpet_address;
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static void **hv_clock;
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int arch_symbols_init(void)
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{
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 16, 0)
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vdso_image_64 = (void *) kallsyms_lookup_name("vdso_image_64");
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if (WARN_ON(!vdso_image_64))
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return -EFAULT;
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#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23)
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vdso_start = (void *) kallsyms_lookup_name("vdso_start");
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if (WARN_ON(!vdso_start))
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return -EFAULT;
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vdso_end = (void *) kallsyms_lookup_name("vdso_end");
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if (WARN_ON(!vdso_end))
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return -EFAULT;
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vdso_pages = (void *) kallsyms_lookup_name("vdso_pages");
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if (WARN_ON(!vdso_pages))
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return -EFAULT;
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#endif
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#ifdef MCCTRL_KSYM_vdso_start
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#if MCCTRL_KSYM_vdso_start
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void *vdso_start = (void *)MCCTRL_KSYM_vdso_start;
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#endif
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#endif
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__vvar_page = (void *) kallsyms_lookup_name("__vvar_page");
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if (WARN_ON(!__vvar_page))
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return -EFAULT;
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#ifdef MCCTRL_KSYM_vdso_end
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#if MCCTRL_KSYM_vdso_end
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void *vdso_end = (void *)MCCTRL_KSYM_vdso_end;
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#endif
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#endif
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hpet_address = (void *) kallsyms_lookup_name("hpet_address");
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hv_clock = (void *) kallsyms_lookup_name("hv_clock");
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return 0;
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}
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#ifdef MCCTRL_KSYM_vdso_pages
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#if MCCTRL_KSYM_vdso_pages
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struct page **vdso_pages = (void *)MCCTRL_KSYM_vdso_pages;
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#endif
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#endif
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#ifdef MCCTRL_KSYM___vvar_page
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#if MCCTRL_KSYM___vvar_page
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void *__vvar_page = (void *)MCCTRL_KSYM___vvar_page;
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#endif
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#endif
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long *hpet_addressp
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#ifdef MCCTRL_KSYM_hpet_address
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#if MCCTRL_KSYM_hpet_address
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= (void *)MCCTRL_KSYM_hpet_address;
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#else
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= &hpet_address;
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#endif
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#else
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= NULL;
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#endif
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void **hv_clockp
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#ifdef MCCTRL_KSYM_hv_clock
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#if MCCTRL_KSYM_hv_clock
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= (void *)MCCTRL_KSYM_hv_clock;
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#else
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= &hv_clock;
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#endif
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#else
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= NULL;
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#endif
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#ifdef POSTK_DEBUG_ARCH_DEP_52
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#define VDSO_MAXPAGES 2
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@ -138,7 +128,7 @@ void get_vdso_info(ihk_os_t os, long vdso_rpa)
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/* VDSO pages */
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0)
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size = vdso_image->size;
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size = vdso_image_64->size;
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vdso->vdso_npages = size >> PAGE_SHIFT;
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if (vdso->vdso_npages > VDSO_MAXPAGES) {
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@ -148,7 +138,7 @@ void get_vdso_info(ihk_os_t os, long vdso_rpa)
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for (i = 0; i < vdso->vdso_npages; ++i) {
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vdso->vdso_physlist[i] = virt_to_phys(
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vdso_image->data + (i * PAGE_SIZE));
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vdso_image_64->data + (i * PAGE_SIZE));
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}
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#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
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size = vdso_end - vdso_start;
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@ -185,36 +175,36 @@ void get_vdso_info(ihk_os_t os, long vdso_rpa)
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#endif
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/* HPET page */
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if (hpet_addressp && *hpet_addressp) {
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if (hpet_address && *hpet_address) {
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,5,0)
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vdso->hpet_is_global = 0;
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vdso->hpet_virt = (void *)(-2 * PAGE_SIZE);
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vdso->hpet_phys = *hpet_addressp;
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vdso->hpet_phys = *hpet_address;
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#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0)
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vdso->hpet_is_global = 0;
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vdso->hpet_virt = (void *)(-1 * PAGE_SIZE);
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vdso->hpet_phys = *hpet_addressp;
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vdso->hpet_phys = *hpet_address;
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#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0)
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vdso->hpet_is_global = 0;
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vdso->hpet_virt = (void *)((vdso->vdso_npages + 1) * PAGE_SIZE);
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vdso->hpet_phys = *hpet_addressp;
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vdso->hpet_phys = *hpet_address;
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#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
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vdso->hpet_is_global = 1;
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vdso->hpet_virt = (void *)fix_to_virt(VSYSCALL_HPET);
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vdso->hpet_phys = *hpet_addressp;
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vdso->hpet_phys = *hpet_address;
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#endif
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}
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/* struct pvlock_vcpu_time_info table */
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if (hv_clockp && *hv_clockp) {
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if (hv_clock && *hv_clock) {
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,5,0)
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vdso->pvti_is_global = 0;
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vdso->pvti_virt = (void *)(-1 * PAGE_SIZE);
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vdso->pvti_phys = virt_to_phys(*hv_clockp);
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vdso->pvti_phys = virt_to_phys(*hv_clock);
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#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0)
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vdso->pvti_is_global = 1;
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vdso->pvti_virt = (void *)fix_to_virt(PVCLOCK_FIXMAP_BEGIN);
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vdso->pvti_phys = virt_to_phys(*hv_clockp);
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vdso->pvti_phys = virt_to_phys(*hv_clock);
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#endif
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}
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@ -39,7 +39,6 @@
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#include <asm/uaccess.h>
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#include <asm/delay.h>
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#include <asm/io.h>
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#include <linux/kallsyms.h>
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#include <linux/syscalls.h>
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#include <trace/events/sched.h>
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#include <config.h>
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@ -56,39 +55,6 @@
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#define dprintk(...)
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#endif
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#ifdef MCCTRL_KSYM_sys_unshare
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#if MCCTRL_KSYM_sys_unshare
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typedef int (*int_star_fn_ulong_t)(unsigned long);
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int (*mcctrl_sys_unshare)(unsigned long unshare_flags) =
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(int_star_fn_ulong_t)
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MCCTRL_KSYM_sys_unshare;
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#else // exported
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int (*mcctrl_sys_unshare)(unsigned long unshare_flags) = NULL;
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#endif
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#endif
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#ifdef MCCTRL_KSYM_sys_mount
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#if MCCTRL_KSYM_sys_mount
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typedef int (*int_star_fn_char_char_char_ulong_void_t)(char *, char *, char *, unsigned long, void *);
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int (*mcctrl_sys_mount)(char *dev_name,char *dir_name, char *type, unsigned long flags, void *data) =
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(int_star_fn_char_char_char_ulong_void_t)
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MCCTRL_KSYM_sys_mount;
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#else // exported
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int (*mcctrl_sys_mount)(char *dev_name,char *dir_name, char *type, unsigned long flags, void *data) = sys_mount;
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#endif
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#endif
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#ifdef MCCTRL_KSYM_sys_umount
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#if MCCTRL_KSYM_sys_umount
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typedef int (*int_fn_char_star_int_t)(char *, int);
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int (*mcctrl_sys_umount)(char *dir_name, int flags) =
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(int_fn_char_star_int_t)
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MCCTRL_KSYM_sys_umount;
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#else // exported
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int (*mcctrl_sys_umount)(char *dir_name, int flags) = sys_umount;
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#endif
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#endif
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//extern struct mcctrl_channel *channels;
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int mcctrl_ikc_set_recv_cpu(ihk_os_t os, int cpu);
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int syscall_backward(struct mcctrl_usrdata *, int, unsigned long, unsigned long,
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@ -1925,12 +1891,8 @@ long mcexec_sys_mount(struct sys_mount_desc *__user arg)
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cap_raise(promoted->cap_effective, CAP_SYS_ADMIN);
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original = override_creds(promoted);
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#ifdef MCCTRL_KSYM_sys_mount
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ret = mcctrl_sys_mount(desc.dev_name, desc.dir_name, desc.type,
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desc.flags, desc.data);
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#else
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ret = -EFAULT;
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#endif
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revert_creds(original);
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put_cred(promoted);
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@ -1956,11 +1918,7 @@ long mcexec_sys_umount(struct sys_mount_desc *__user arg)
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cap_raise(promoted->cap_effective, CAP_SYS_ADMIN);
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original = override_creds(promoted);
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#ifdef MCCTRL_KSYM_sys_umount
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ret = mcctrl_sys_umount(desc.dir_name, MNT_FORCE);
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#else
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ret = -EFAULT;
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#endif
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revert_creds(original);
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put_cred(promoted);
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@ -1986,11 +1944,7 @@ long mcexec_sys_unshare(struct sys_unshare_desc *__user arg)
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cap_raise(promoted->cap_effective, CAP_SYS_ADMIN);
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original = override_creds(promoted);
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#if MCCTRL_KSYM_sys_unshare
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ret = mcctrl_sys_unshare(desc.unshare_flags);
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#else
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ret = -EFAULT;
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#endif
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revert_creds(original);
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put_cred(promoted);
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@ -2510,9 +2464,6 @@ cache_topo_search(struct ihk_cpu_topology *cpu_topo, int level)
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return NULL;
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}
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static long (*setaffinity)(pid_t pid, const struct cpumask *in_mask);
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static int (*setscheduler_nocheck)(struct task_struct *p, int policy,
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const struct sched_param *param);
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static unsigned int *uti_rr;
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static int max_cpu;
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@ -2526,20 +2477,6 @@ uti_attr_init(void)
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if (uti_rr)
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return 0;
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if (!setaffinity) {
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setaffinity = (long (*)(pid_t, const struct cpumask *))
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kallsyms_lookup_name("sched_setaffinity");
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if (!setaffinity)
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return -ENOSYS;
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}
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if (!setscheduler_nocheck) {
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setscheduler_nocheck = (int (*)(struct task_struct *, int,
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const struct sched_param *))
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kallsyms_lookup_name("sched_setscheduler_nocheck");
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if (!setscheduler_nocheck)
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return -ENOSYS;
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}
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for_each_possible_cpu(i) {
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max_cpu = i;
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}
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@ -2757,29 +2694,29 @@ mcexec_uti_attr(ihk_os_t os, struct uti_attr_desc __user *arg)
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else if (kattr->attr.flags & UTI_FLAG_EXCLUSIVE_CPU) {
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struct sched_param sp;
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setaffinity(0, uti_cpu_select(cpuset));
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mcctrl_sched_setaffinity(0, uti_cpu_select(cpuset));
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sp.sched_priority = 1;
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setscheduler_nocheck(current, SCHED_FIFO, &sp);
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mcctrl_sched_setscheduler_nocheck(current, SCHED_FIFO, &sp);
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rc = 1;
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}
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else if (kattr->attr.flags & UTI_FLAG_CPU_INTENSIVE) {
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setaffinity(0, uti_cpu_select(cpuset));
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mcctrl_sched_setaffinity(0, uti_cpu_select(cpuset));
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rc = 1;
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}
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else if (kattr->attr.flags & UTI_FLAG_HIGH_PRIORITY) {
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struct sched_param sp;
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setaffinity(0, uti_cpu_select(cpuset));
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mcctrl_sched_setaffinity(0, uti_cpu_select(cpuset));
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sp.sched_priority = 1;
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setscheduler_nocheck(current, SCHED_FIFO, &sp);
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mcctrl_sched_setscheduler_nocheck(current, SCHED_FIFO, &sp);
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rc = 1;
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}
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else if (kattr->attr.flags & UTI_FLAG_NON_COOPERATIVE) {
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setaffinity(0, uti_cpu_select(cpuset));
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mcctrl_sched_setaffinity(0, uti_cpu_select(cpuset));
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rc = 1;
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}
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else {
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setaffinity(0, cpuset);
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mcctrl_sched_setaffinity(0, cpuset);
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}
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kfree(cpuset);
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@ -28,6 +28,7 @@
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#include <linux/slab.h>
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#include <linux/device.h>
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#include <linux/delay.h>
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#include <linux/kallsyms.h>
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#include "mcctrl.h"
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#include <ihk/ihk_host_user.h>
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@ -214,6 +215,60 @@ static struct ihk_os_notifier mcctrl_os_notifier = {
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.ops = &mcctrl_os_notifier_ops,
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};
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int (*mcctrl_sys_mount)(char *dev_name, char *dir_name, char *type,
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unsigned long flags, void *data);
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int (*mcctrl_sys_umount)(char *dir_name, int flags);
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int (*mcctrl_sys_unshare)(unsigned long unshare_flags);
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long (*mcctrl_sched_setaffinity)(pid_t pid, const struct cpumask *in_mask);
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int (*mcctrl_sched_setscheduler_nocheck)(struct task_struct *p, int policy,
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const struct sched_param *param);
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ssize_t (*mcctrl_sys_readlink)(const char *path, char *buf,
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size_t bufsiz);
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void (*mcctrl_zap_page_range)(struct vm_area_struct *vma,
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unsigned long start,
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unsigned long size,
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struct zap_details *details);
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static int symbols_init(void)
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{
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mcctrl_sys_mount = (void *) kallsyms_lookup_name("sys_mount");
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if (WARN_ON(!mcctrl_sys_mount))
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return -EFAULT;
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mcctrl_sys_umount = (void *) kallsyms_lookup_name("sys_umount");
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if (WARN_ON(!mcctrl_sys_umount))
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return -EFAULT;
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|
||||
mcctrl_sys_unshare = (void *) kallsyms_lookup_name("sys_unshare");
|
||||
if (WARN_ON(!mcctrl_sys_unshare))
|
||||
return -EFAULT;
|
||||
|
||||
mcctrl_sched_setaffinity =
|
||||
(void *) kallsyms_lookup_name("sched_setaffinity");
|
||||
if (WARN_ON(!mcctrl_sched_setaffinity))
|
||||
return -EFAULT;
|
||||
|
||||
mcctrl_sched_setscheduler_nocheck =
|
||||
(void *) kallsyms_lookup_name("sched_setscheduler_nocheck");
|
||||
if (WARN_ON(!mcctrl_sched_setscheduler_nocheck))
|
||||
return -EFAULT;
|
||||
|
||||
mcctrl_sys_readlink =
|
||||
(void *) kallsyms_lookup_name("sys_readlink");
|
||||
if (WARN_ON(!mcctrl_sys_readlink))
|
||||
return -EFAULT;
|
||||
|
||||
mcctrl_zap_page_range =
|
||||
(void *) kallsyms_lookup_name("zap_page_range");
|
||||
if (WARN_ON(!mcctrl_zap_page_range))
|
||||
return -EFAULT;
|
||||
|
||||
return arch_symbols_init();
|
||||
}
|
||||
|
||||
static int __init mcctrl_init(void)
|
||||
{
|
||||
int ret = 0;
|
||||
@ -231,6 +286,9 @@ static int __init mcctrl_init(void)
|
||||
|
||||
binfmt_mcexec_init();
|
||||
|
||||
if ((ret = symbols_init()))
|
||||
goto error;
|
||||
|
||||
if ((ret = ihk_host_register_os_notifier(&mcctrl_os_notifier)) != 0) {
|
||||
printk("mcctrl: error: registering OS notifier\n");
|
||||
goto error;
|
||||
|
||||
@ -400,6 +400,23 @@ int mcctrl_ikc_send_wait(ihk_os_t os, int cpu, struct ikc_scd_packet *pisp,
|
||||
|
||||
ihk_os_t osnum_to_os(int n);
|
||||
|
||||
/* look up symbols, plus arch-specific ones */
|
||||
extern int (*mcctrl_sys_mount)(char *dev_name, char *dir_name, char *type,
|
||||
unsigned long flags, void *data);
|
||||
extern int (*mcctrl_sys_umount)(char *dir_name, int flags);
|
||||
extern int (*mcctrl_sys_unshare)(unsigned long unshare_flags);
|
||||
extern long (*mcctrl_sched_setaffinity)(pid_t pid,
|
||||
const struct cpumask *in_mask);
|
||||
extern int (*mcctrl_sched_setscheduler_nocheck)(struct task_struct *p,
|
||||
int policy,
|
||||
const struct sched_param *param);
|
||||
extern ssize_t (*mcctrl_sys_readlink)(const char *path, char *buf,
|
||||
size_t bufsiz);
|
||||
extern void (*mcctrl_zap_page_range)(struct vm_area_struct *vma,
|
||||
unsigned long start,
|
||||
unsigned long size,
|
||||
struct zap_details *details);
|
||||
|
||||
/* syscall.c */
|
||||
void pager_add_process(void);
|
||||
void pager_remove_process(struct mcctrl_per_proc_data *ppd);
|
||||
@ -504,6 +521,7 @@ struct vdso {
|
||||
int reserve_user_space(struct mcctrl_usrdata *usrdata, unsigned long *startp,
|
||||
unsigned long *endp);
|
||||
void get_vdso_info(ihk_os_t os, long vdso_pa);
|
||||
int arch_symbols_init(void);
|
||||
|
||||
struct get_cpu_mapping_req {
|
||||
int busy; /* INOUT: */
|
||||
|
||||
@ -63,16 +63,6 @@
|
||||
#define dprintk(...)
|
||||
#endif
|
||||
|
||||
#ifdef MCCTRL_KSYM_zap_page_range
|
||||
static void
|
||||
(*mcctrl_zap_page_range)(struct vm_area_struct *vma, unsigned long start,
|
||||
unsigned long size, struct zap_details *details)
|
||||
#if MCCTRL_KSYM_zap_page_range
|
||||
= (void *)MCCTRL_KSYM_zap_page_range;
|
||||
#else
|
||||
= &zap_page_range;
|
||||
#endif
|
||||
#endif
|
||||
|
||||
static long pager_call(ihk_os_t os, struct syscall_request *req);
|
||||
|
||||
|
||||
@ -892,16 +892,6 @@ out:
|
||||
return error;
|
||||
} /* read_long() */
|
||||
|
||||
#ifdef MCCTRL_KSYM_sys_readlink
|
||||
static ssize_t (*mcctrl_sys_readlink)(const char *path, char *buf,
|
||||
size_t bufsiz)
|
||||
#if MCCTRL_KSYM_sys_readlink
|
||||
= (void *)MCCTRL_KSYM_sys_readlink;
|
||||
#else
|
||||
= &sys_readlink;
|
||||
#endif
|
||||
#endif
|
||||
|
||||
static int read_link(char *buf, size_t bufsize, char *fmt, ...)
|
||||
{
|
||||
int error;
|
||||
|
||||
Reference in New Issue
Block a user