#include <afsconfig.h>
#include "afs/param.h"
#endif
+#if defined(ENABLE_LINUX_SYSCALL_PROBING) && defined(EXPORTED_INIT_MM)
+#ifdef AFS_LINUX24_ENV
#include <linux/module.h> /* early to avoid printf->printk mapping */
+#ifdef AFS_LINUX26_ENV
+#include <scsi/scsi.h> /* for scsi_command_size */
+#endif
#ifndef OSI_PROBE_STANDALONE
#include "afs/sysincludes.h"
#include "afsincludes.h"
#endif
#include <linux/version.h>
+#include <linux/sched.h>
+#ifdef CONFIG_H_EXISTS
#include <linux/config.h>
+#endif
#include <linux/linkage.h>
#include <linux/init.h>
#include <linux/unistd.h>
#include <linux/mm.h>
-#ifdef AFS_AMD64_LINUX20_ENV
-#include <asm/ia32_unistd.h>
+#if defined(AFS_PPC64_LINUX26_ENV)
+#include <asm/abs_addr.h>
#endif
-#ifdef HAVE_KERNEL_LINUX_SYSCALL_H
-#include <linux/syscall.h>
+#ifdef AFS_AMD64_LINUX20_ENV
+#include <asm/ia32_unistd.h>
#endif
/* number of syscalls */
#endif
/* lower bound of valid kernel text pointers */
-//#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
+#ifdef AFS_IA64_LINUX20_ENV
+#define ktxt_lower_bound (((unsigned long)&kernel_thread ) & 0xfff00000L)
+#elif defined(AFS_PPC64_LINUX20_ENV)
+#define ktxt_lower_bound (KERNELBASE)
+#else
#define ktxt_lower_bound (((unsigned long)&kernel_thread ) & ~0xfffffL)
-//#else
-//#define ktxt_lower_bound (((unsigned long)&empty_zero_page) & ~0xfffffL)
-//#endif
+#endif
/* On SPARC64 and S390X, sys_call_table contains 32-bit entries
* even though pointers are 64 bit quantities.
#define PROBETYPE long
#endif
+#if defined(AFS_S390X_LINUX20_ENV) && !defined(AFS_S390X_LINUX26_ENV)
+#define _SS(x) ((x) << 1)
+#define _SX(x) ((x) &~ 1)
+#else
+#define _SS(x) (x)
+#define _SX(x) (x)
+#endif
+
+/* Older Linux doesn't have __user. The sys_read prototype needs it. */
+#ifndef __user
+#define __user
+#endif
/* Allow the user to specify sys_call_table addresses */
static unsigned long sys_call_table_addr[4] = { 0,0,0,0 };
+#if defined(module_param_array) && LINUX_VERSION_CODE > KERNEL_VERSION(2,6,9)
+module_param_array(sys_call_table_addr, long, NULL, 0);
+#else
MODULE_PARM(sys_call_table_addr, "1-4l");
+#endif
MODULE_PARM_DESC(sys_call_table_addr, "Location of system call tables");
/* If this is set, we are more careful about avoiding duplicate matches */
static int probe_carefully = 1;
+#if defined(module_param) && LINUX_VERSION_CODE > KERNEL_VERSION(2,6,9)
+module_param(probe_carefully, int, 0);
+#else
MODULE_PARM(probe_carefully, "i");
+#endif
MODULE_PARM_DESC(probe_carefully, "Probe for system call tables carefully");
static int probe_ignore_syscalls[8] = { -1, -1, -1, -1, -1, -1, -1, -1 };
+#if defined(module_param_array) && LINUX_VERSION_CODE > KERNEL_VERSION(2,6,9)
+module_param_array(probe_ignore_syscalls, int, NULL, 0);
+#else
MODULE_PARM(probe_ignore_syscalls, "1-8i");
+#endif
MODULE_PARM_DESC(probe_ignore_syscalls, "Syscalls to ignore in table checks");
#ifdef OSI_PROBE_DEBUG
* 0x0010 - detail - check_harder
* 0x0020 - detail - check_harder/zapped
* 0x0040 - automatically ignore setgroups and afs_syscall
+ * 0x0080 - detail - check_table_readable
*/
static int probe_debug = 0x41;
+#if defined(module_param) && LINUX_VERSION_CODE > KERNEL_VERSION(2,6,9)
+module_param(probe_debug, int, 0);
+#else
MODULE_PARM(probe_debug, "i");
+#endif
MODULE_PARM_DESC(probe_debug, "Debugging level");
static unsigned long probe_debug_addr[4] = { 0,0,0,0 };
+#if defined(module_param_array) && LINUX_VERSION_CODE > KERNEL_VERSION(2,6,9)
+module_param_array(probe_debug_addr, long, NULL, 0);
+#else
MODULE_PARM(probe_debug_addr, "1-4l");
+#endif
MODULE_PARM_DESC(probe_debug_addr, "Debug range starting locations");
static unsigned long probe_debug_range = 0;
+#if defined(module_param) && LINUX_VERSION_CODE > KERNEL_VERSION(2,6,9)
+module_param(probe_debug_range, long, 0);
+#else
MODULE_PARM(probe_debug_range, "l");
+#endif
MODULE_PARM_DESC(probe_debug_range, "Debug range length");
static unsigned long probe_debug_tag = 0;
+#if defined(module_param) && LINUX_VERSION_CODE > KERNEL_VERSION(2,6,9)
+module_param(probe_debug_tag, long, 0);
+#else
MODULE_PARM(probe_debug_tag, "l");
+#endif
MODULE_PARM_DESC(probe_debug_tag, "Debugging output start tag");
#endif
/* Weak references are our friends. They are supported by the in-kernel
* linker in Linux 2.6 and by all versions of modutils back to 2.2pre1.
* A weak reference not satisified by the kernel will have value zero.
+ *
+ * Unfortunately, weak references to functions don't work right on
+ * IA64; specifically, if you actually try to make a call through
+ * such a reference, and the symbol doesn't exist in the kernel, then
+ * the module relocation code will oops. A workaround for this is
+ * probably possible, but the use of kallsyms_* is of limited value,
+ * so I'm not bothing with the effort for now.
+ * -- jhutz, 10-Feb-2005
*/
+#ifdef OSI_PROBE_KALLSYMS
extern int kallsyms_symbol_to_address(char *name, unsigned long *token,
char **mod_name,
unsigned long *mod_start,
unsigned long *sym_start,
unsigned long *sym_end
) __attribute__((weak));
+#endif
extern SYSCALLTYPE sys_call_table[] __attribute__((weak));
extern SYSCALLTYPE ia32_sys_call_table[] __attribute__((weak));
extern SYSCALLTYPE sys_call_table32[] __attribute__((weak));
+extern SYSCALLTYPE sys_call_table_emu[] __attribute__((weak));
+extern asmlinkage ssize_t sys_read(unsigned int fd, char __user * buf, size_t count) __attribute__((weak));
extern asmlinkage long sys_close(unsigned int) __attribute__((weak));
+#if defined(EXPORTED_SYS_CHDIR)
extern asmlinkage long sys_chdir(const char *) __attribute__((weak));
-extern asmlinkage int sys_write(unsigned int, const char *, size_t) __attribute__((weak));
+#endif
+extern asmlinkage ssize_t sys_write(unsigned int, const char *, size_t) __attribute__((weak));
#ifdef AFS_LINUX26_ENV
extern asmlinkage long sys_wait4(pid_t, int *, int, struct rusage *) __attribute__((weak));
#else
extern asmlinkage long sys_wait4(pid_t, unsigned int *, int, struct rusage *) __attribute__((weak));
#endif
-extern asmlinkage int sys_exit (int) __attribute__((weak));
+extern asmlinkage long sys_exit (int) __attribute__((weak));
+#if defined(EXPORTED_SYS_OPEN)
extern asmlinkage long sys_open (const char *, int, int) __attribute__((weak));
+#endif
extern asmlinkage long sys_ioctl(unsigned int, unsigned int, unsigned long) __attribute__((weak));
unsigned long try_base_mask; /* base address bits to force to zero */
unsigned long try_length; /* default length for scan */
+ unsigned long alt_try_sect_sym; /* symbol in section to try scanning */
+ unsigned long alt_try_base; /* default base address for scan */
+ unsigned long alt_try_base_mask; /* base address bits to force to zero */
+ unsigned long alt_try_length; /* default length for scan */
+
int n_zapped_syscalls; /* number of unimplemented system calls */
int *zapped_syscalls; /* list of unimplemented system calls */
int debug_ignore_NR[4]; /* syscalls to ignore for debugging */
} probectl;
+#if defined(AFS_I386_LINUX26_ENV) || defined(AFS_AMD64_LINUX26_ENV)
+static int check_access(unsigned long, int);
+static int check_table_readable(probectl *, PROBETYPE *);
+#endif
/********** Probing Configuration: sys_call_table **********/
/* On PPC64 and SPARC64, we need to omit the ones that might match both tables */
static tryctl main_try[] = {
#if !defined(AFS_PPC64_LINUX20_ENV) && !defined(AFS_SPARC64_LINUX20_ENV)
+#if defined(EXPORTED_SYS_CHDIR)
{ "scan: close+chdir+write", __NR_close, &sys_close, __NR_chdir, &sys_chdir, __NR_write, &sys_write },
#endif
+#endif
{ "scan: close+wait4", __NR_close, &sys_close, __NR_wait4, &sys_wait4, -1, 0 },
#if !defined(AFS_PPC64_LINUX20_ENV) && !defined(AFS_SPARC64_LINUX20_ENV)
+#if defined(EXPORTED_SYS_CHDIR)
{ "scan: close+chdir", __NR_close, &sys_close, __NR_chdir, &sys_chdir, -1, 0 },
#endif
+#endif
{ "scan: close+ioctl", __NR_close, &sys_close, __NR_ioctl, &sys_ioctl, -1, 0 },
+#if defined(EXPORTED_SYS_OPEN)
{ "scan: exit+open", __NR_exit, &sys_exit, __NR_open, &sys_open, -1, 0 },
+#endif
{ 0 }
};
* corresponding __NR macros are not defined, so the tests above fail.
* Instead, we just have to know the numbers for these.
*/
-#ifdef AFS_S390_LINUX20_ENV
+#if defined(AFS_S390_LINUX20_ENV) || defined(AFS_S390X_LINUX20_ENV)
/* break, stty, gtty, ftime, prof, lock, mpx */
17, 31, 32, 35, 44, 53, 56,
#endif
* mmap2 and fstat64 are implemented only for 32-bit calls
*/
#ifdef AFS_PPC64_LINUX20_ENV
- __NR_mmap2,
- __NR_fstat64,
+ /* _mmap2, _fstat64 */
+ 192, 197,
#endif /* AFS_PPC64_LINUX20_ENV */
/* Similarly for S390X, with lcown16 and fstat64 */
/* unique syscalls for try_harder */
static int main_unique_syscalls[] = {
+#if defined(AFS_SPARC64_LINUX24_ENV) || defined(AFS_SPARC_LINUX24_ENV)
+ /*
+ * On SPARC, we need some additional unique calls to make sure
+ * we don't match the SunOS-compatibility table.
+ */
+ __NR_sgetmask, __NR_ssetmask,
+#endif
__NR_exit, __NR_mount, __NR_read, __NR_write,
__NR_open, __NR_close, __NR_unlink
};
main_try, /* array of combinations to try */
/* symbol in section to try scanning */
-#if defined(AFS_SPARC64_LINUX20_ENV)
+#if defined(AFS_SPARC64_LINUX20_ENV) || defined(AFS_S390_LINUX20_ENV) || defined(AFS_S390X_LINUX20_ENV)
(unsigned long)&sys_close,
+#elif defined(AFS_AMD64_LINUX26_ENV)
+ /* On this platform, it's in a different section! */
+ (unsigned long)&generic_ro_fops,
#elif defined(AFS_AMD64_LINUX20_ENV)
/* On this platform, it's in a different section! */
(unsigned long)&tasklist_lock,
(unsigned long)(&sys_close),
0xfffff,
0x10000,
+#elif defined(AFS_S390_LINUX20_ENV) || defined(AFS_S390X_LINUX20_ENV)
+ /* bleah; this is so suboptimal */
+ (unsigned long)(&sys_close),
+ 0xfffff,
+ 0x20000,
#elif defined(AFS_IA64_LINUX20_ENV)
- (unsigned long)(&sys_close - 0x180000),
+ (unsigned long)(&init_mm),
+ 0x1fffff,
+ 0x30000,
+#elif defined(AFS_AMD64_LINUX26_ENV)
+ (unsigned long)(&generic_ro_fops) - 0x30000,
0,
- (0x180000 / sizeof(unsigned long *)),
+ 0x6000,
#elif defined(AFS_AMD64_LINUX20_ENV)
- (unsigned long)(&tasklist_lock - 0x1000),
+ (unsigned long)(&tasklist_lock) - 0x30000,
0,
+ 0x6000,
+#elif defined(AFS_PPC64_LINUX26_ENV)
+ (unsigned long)(&do_signal),
+ 0xfff,
+ 0x400,
+#elif defined(AFS_PPC_LINUX20_ENV) || defined(AFS_PPC_LINUX20_ENV)
+ (unsigned long)&init_mm,
+ 0xffff,
16384,
#else
(unsigned long)&init_mm,
16384,
#endif
+#ifdef AFS_LINUX26_ENV
+ (unsigned long)scsi_command_size,
+ (unsigned long)scsi_command_size - 0x10000,
+ 0x3ffff,
+ 0x40000,
+#else
+ 0, 0, 0, 0,
+#endif
+
/* number and list of unimplemented system calls */
((sizeof(main_zapped_syscalls)/sizeof(main_zapped_syscalls[0])) - 1),
main_zapped_syscalls,
/* syscall pairs/triplets to probe */
static tryctl ia32_try[] = {
+#if defined(EXPORTED_SYS_CHDIR)
{ "scan: close+chdir+write", __NR_ia32_close, &sys_close, __NR_ia32_chdir, &sys_chdir, __NR_ia32_write, &sys_write },
{ "scan: close+chdir", __NR_ia32_close, &sys_close, __NR_ia32_chdir, &sys_chdir, -1, 0 },
+#endif
{ 0 }
};
0,
(0x180000 / sizeof(unsigned long *)),
+#ifdef AFS_LINUX26_ENV
+ (unsigned long)scsi_command_size,
+ (unsigned long)scsi_command_size - 0x10000,
+ 0x3ffff,
+ 0x40000,
+#else
+ 0, 0, 0, 0,
+#endif
+
+
/* number and list of unimplemented system calls */
((sizeof(ia32_zapped_syscalls)/sizeof(ia32_zapped_syscalls[0])) - 1),
ia32_zapped_syscalls,
};
+/********** Probing Configuration: IA64 **********/
+#elif defined(AFS_IA64_LINUX20_ENV)
+struct fptr {
+ void *ip;
+ unsigned long gp;
+};
+
+/* no 32-bit support on IA64 for now */
+static probectl *probe_list[] = {
+ &main_probe
+};
+
+
/********** Probing Configuration: ppc64, sparc64 sys_call_table32 **********/
#elif defined(AFS_PPC64_LINUX20_ENV) || defined(AFS_SPARC64_LINUX20_ENV)
+struct fptr {
+ void *ip;
+ unsigned long gp;
+};
/*
* syscall pairs/triplets to probe
/* mmap2 and fstat64 are implemented only for 32-bit calls */
static int sct32_unique_syscalls[] = {
#ifdef AFS_PPC64_LINUX20_ENV
- __NR_mmap2, __NR_fstat64,
+ /* _mmap2, _fstat64 */
+ 192, 197,
+#endif
+#ifdef AFS_SPARC64_LINUX24_ENV
+ /*
+ * On SPARC, we need some additional unique calls to make sure
+ * we don't match the SunOS-compatibility table.
+ */
+ __NR_sgetmask, __NR_ssetmask,
#endif
__NR_exit, __NR_mount, __NR_read, __NR_write,
__NR_open, __NR_close, __NR_unlink
(unsigned long)(&sys_close),
0xfffff,
0x10000,
+#elif defined(AFS_PPC64_LINUX26_ENV)
+ (unsigned long)(&do_signal),
+ 0xfff,
+ 0x400,
#else
(unsigned long)&init_mm,
0,
16384,
#endif
+#ifdef AFS_LINUX26_ENV
+ (unsigned long)scsi_command_size,
+ (unsigned long)scsi_command_size - 0x10000,
+ 0x3ffff,
+ 0x40000,
+#else
+ 0, 0, 0, 0,
+#endif
+
/* number and list of unimplemented system calls */
((sizeof(sct32_zapped_syscalls)/sizeof(sct32_zapped_syscalls[0])) - 1),
sct32_zapped_syscalls,
/********** Probing Configuration: s390x sys_call_table_emu **********/
-#elif defined(AFS_S390X_LINUX20_ENV)
+/* We only actually need to do this on s390x_linux26 and later.
+ * On earlier versions, the two tables were interleaved and so
+ * have related base addresses.
+ */
+#elif defined(AFS_S390X_LINUX26_ENV)
/* syscall pairs/triplets to probe */
/* nothing worthwhile is exported, so this is empty */
emu_try, /* array of combinations to try */
/* symbol in section to try scanning */
- (unsigned long)&init_mm,
+ (unsigned long)&sys_close,
/* default base address for scan */
/* base address bits to force to zero */
/* default length for scan */
- (unsigned long)&init_mm,
- 0,
- 16384,
+ (unsigned long)&sys_close,
+ 0xfffff,
+ 0x20000,
+
+#ifdef AFS_LINUX26_ENV
+ (unsigned long)scsi_command_size,
+ (unsigned long)scsi_command_size - 0x10000,
+ 0x3ffff,
+ 0x40000,
+#else
+ 0, 0, 0, 0,
+#endif
/* number and list of unimplemented system calls */
((sizeof(emu_zapped_syscalls)/sizeof(emu_zapped_syscalls[0])) - 1),
PROBETYPE *x;
int i, j;
- for (x = ptr, i = 0; i < NR_syscalls; i++, x++) {
+#if defined(AFS_I386_LINUX26_ENV) || defined(AFS_AMD64_LINUX26_ENV)
+ i = check_table_readable(P, ptr);
+ if (i >= 0) return i;
+#endif
+
+ for (x = ptr, i = 0; i < _SS(NR_syscalls); i++, x++) {
#ifdef OSI_PROBE_DEBUG
if (probe_debug & 0x0040) {
for (j = 0; j < 4; j++) {
- if (P->debug_ignore_NR[j] == i) break;
+ if (_SS(P->debug_ignore_NR[j]) == _SX(i + P->offset)) break;
}
if (j < 4) continue;
}
#endif
for (j = 0; j < 8; j++) {
- if (probe_ignore_syscalls[j] == i) break;
+ if (_SS(probe_ignore_syscalls[j]) == _SX(i) + P->offset) break;
}
if (j < 8) continue;
if (*x <= ktxt_lower_bound) {
return -1;
}
-static void *try(probectl *P, tryctl *T, PROBETYPE *ptr,
+static void *try(probectl *P, tryctl *T, PROBETYPE *aptr,
unsigned long datalen)
{
+#ifdef OSI_PROBE_KALLSYMS
char *mod_name, *sec_name, *sym_name;
unsigned long mod_start, mod_end;
unsigned long sec_start, sec_end;
unsigned long sym_start, sym_end;
+#endif
unsigned long offset, ip1, ip2, ip3;
int ret;
+ PROBETYPE *ptr;
-#ifdef AFS_IA64_LINUX20_ENV
+#if defined(AFS_IA64_LINUX20_ENV) || defined(AFS_PPC64_LINUX20_ENV)
ip1 = T->fn1 ? (unsigned long)((struct fptr *)T->fn1)->ip : 0;
ip2 = T->fn2 ? (unsigned long)((struct fptr *)T->fn2)->ip : 0;
ip3 = T->fn3 ? (unsigned long)((struct fptr *)T->fn3)->ip : 0;
if (!ip1 || !ip2 || (T->NR3 >= 0 && !ip3))
return 0;
- for (offset = 0; offset < datalen; offset++, ptr++) {
+ for (offset = 0; offset < datalen; offset++, aptr++) {
+#if defined(AFS_PPC64_LINUX20_ENV)
+ ptr = (PROBETYPE*)(*aptr);
+ if ((unsigned long)ptr <= KERNELBASE) {
+ continue;
+ }
+#else
+ ptr = aptr;
+#endif
+ if ((unsigned long)ptr < init_mm.start_code ||
+#if defined(AFS_AMD64_LINUX20_ENV)
+ (unsigned long)ptr > init_mm.brk)
+#else
+ (unsigned long)ptr > init_mm.end_data)
+#endif
+ {
+/* printk("address 0x%lx (from 0x%lx %d) is out of range in check_table. wtf?\n", (unsigned long)x, (unsigned long)ptr, i);*/
+ continue;
+ }
+
ret = check_table(P, ptr);
if (ret >= 0) {
/* return value is number of entries to skip */
- ptr += ret;
+ aptr += ret;
offset += ret;
continue;
}
if ((probe_debug & 0x0002) && DEBUG_IN_RANGE(P,ptr))
printk("<7>try 0x%lx\n", (unsigned long)ptr);
#endif
- if (ptr[T->NR1 - P->offset] != ip1) continue;
- if (ptr[T->NR2 - P->offset] != ip2) continue;
- if (ip3 && ptr[T->NR3 - P->offset] != ip3) continue;
+ if (ptr[_SS(T->NR1 - P->offset)] != ip1) continue;
+ if (ptr[_SS(T->NR2 - P->offset)] != ip2) continue;
+ if (ip3 && ptr[_SS(T->NR3 - P->offset)] != ip3) continue;
#ifdef OSI_PROBE_DEBUG
if (probe_debug & 0x0002)
printk("<7>try found 0x%lx\n", (unsigned long)ptr);
#endif
+#ifdef OSI_PROBE_KALLSYMS
if (kallsyms_address_to_symbol) {
ret = kallsyms_address_to_symbol((unsigned long)ptr,
&mod_name, &mod_start, &mod_end,
&sym_name, &sym_start, &sym_end);
if (!ret || strcmp(sym_name, P->symbol)) continue;
}
+#endif
/* XXX should we make sure there is only one match? */
return (void *)ptr;
}
unsigned long ip1;
int i, s;
+#if defined(AFS_I386_LINUX26_ENV) || defined(AFS_AMD64_LINUX26_ENV)
+ i = check_table_readable(P, p);
+ if (i >= 0) return 0;
+#endif
+
/* Check zapped syscalls */
for (i = 1; i < P->n_zapped_syscalls; i++) {
- if (p[P->zapped_syscalls[i]] != p[P->zapped_syscalls[0]]) {
+ if (p[_SS(P->zapped_syscalls[i])] != p[_SS(P->zapped_syscalls[0])]) {
#ifdef OSI_PROBE_DEBUG
if ((probe_debug & 0x0020) && DEBUG_IN_RANGE(P,p))
printk("<7>check_harder 0x%lx zapped failed i=%d\n", (unsigned long)p, i);
/* Check unique syscalls */
for (i = 0; i < P->n_unique_syscalls; i++) {
for (s = 0; s < NR_syscalls; s++) {
- if (p[s] == p[P->unique_syscalls[i]] && s != P->unique_syscalls[i]) {
+ if (p[_SS(s)] == p[_SS(P->unique_syscalls[i])]
+ && s != P->unique_syscalls[i]) {
#ifdef OSI_PROBE_DEBUG
if ((probe_debug & 0x0010) && DEBUG_IN_RANGE(P,p))
printk("<7>check_harder 0x%lx unique failed i=%d s=%d\n", (unsigned long)p, i, s);
}
}
-#ifdef AFS_IA64_LINUX20_ENV
+#if defined(AFS_IA64_LINUX20_ENV) || defined(AFS_PPC64_LINUX20_ENV)
ip1 = P->verify_fn ? (unsigned long)((struct fptr *)(P->verify_fn))->ip : 0;
#else
ip1 = (unsigned long)(P->verify_fn);
#endif
- if (ip1 && p[P->verifyNR - P->offset] != ip1) {
+ if (ip1 && p[_SS(P->verifyNR - P->offset)] != ip1) {
#ifdef OSI_PROBE_DEBUG
if ((probe_debug & 0x0010) && DEBUG_IN_RANGE(P,p))
printk("<7>check_harder 0x%lx verify failed\n", (unsigned long)p);
static void *try_harder(probectl *P, PROBETYPE *ptr, unsigned long datalen)
{
+#ifdef OSI_PROBE_KALLSYMS
char *mod_name, *sec_name, *sym_name;
unsigned long mod_start, mod_end;
unsigned long sec_start, sec_end;
unsigned long sym_start, sym_end;
+#endif
unsigned long offset;
void *match = 0;
int ret;
printk("<7>osi_probe: %s try_harder\n", P->symbol);
#endif
for (offset = 0; offset < datalen; offset++, ptr++) {
+ if ((unsigned long)ptr < init_mm.start_code ||
+#if defined(AFS_AMD64_LINUX20_ENV)
+ (unsigned long)ptr > init_mm.brk)
+#else
+ (unsigned long)ptr > init_mm.end_data)
+#endif
+ {
+/* printk("address 0x%lx (from 0x%lx %d) is out of range in check_table. wtf?\n", (unsigned long)x, (unsigned long)ptr, i);*/
+ continue;
+ }
ret = check_table(P, ptr);
if (ret >= 0) {
/* return value is number of entries to skip */
printk("<7>try_harder found 0x%lx\n", (unsigned long)ptr);
#endif
+#ifdef OSI_PROBE_KALLSYMS
if (kallsyms_address_to_symbol) {
ret = kallsyms_address_to_symbol((unsigned long)ptr,
&mod_name, &mod_start, &mod_end,
&sym_name, &sym_start, &sym_end);
if (!ret || strcmp(sym_name, P->symbol)) continue;
}
+#endif
if (match) {
#ifdef OSI_PROBE_DEBUG
if (probe_debug & 0x0001) { \
printk("<7>osi_probe: %s = 0x%016lx %s\n", P->symbol, (unsigned long)(x), (m)); \
} \
- if ((x)) { \
+ if ((x) && ((int)(x)) != -ENOENT) { \
*method = (m); \
final_answer = (void *)(x); \
} \
} while (0)
#else
#define check_result(x,m) do { \
- if ((x)) { \
+ if ((x) && ((int)(x)) != -ENOENT) { \
*method = (m); \
return (void *)(x); \
} \
} while (0)
#endif
+static void *scan_for_syscall_table(probectl *P, PROBETYPE *B, unsigned long L)
+{
+ tryctl *T;
+ void *answer;
+#if defined(AFS_S390_LINUX20_ENV) || defined(AFS_S390X_LINUX20_ENV)
+ void *answer2;
+#endif
+#ifdef OSI_PROBE_DEBUG
+ void *final_answer = 0;
+#endif
+#ifdef OSI_PROBE_DEBUG
+ if (probe_debug & 0x0007)
+ printk("<7>osi_probe: %s base=0x%lx, len=0x%lx\n",
+ P->symbol, (unsigned long)B, L);
+ if (probe_debug & 0x0009) {
+ printk("<7>osi_probe: %s ktxt_lower_bound=0x%lx\n",
+ P->symbol, ktxt_lower_bound);
+ printk("<7>osi_probe: %s NR_syscalls=%d\n",
+ P->symbol, NR_syscalls);
+ }
+#endif
+
+ for (T = P->trylist; T->name; T++) {
+ answer = try(P, T, B, L);
+#if defined(AFS_S390_LINUX20_ENV) || defined(AFS_S390X_LINUX20_ENV)
+ answer2 = try(P, T, (PROBETYPE *)(2 + (void *)B), L);
+#ifdef OSI_PROBE_DEBUG
+ if (probe_debug & 0x0003) {
+ printk("<7>osi_probe: %s = 0x%016lx %s (even)\n",
+ P->symbol, (unsigned long)(answer), T->name);
+ printk("<7>osi_probe: %s = 0x%016lx %s (odd)\n",
+ P->symbol, (unsigned long)(answer2), T->name);
+ }
+#endif
+ if (answer && answer2) answer = 0;
+ else if (answer2) answer = answer2;
+#endif
+ if (answer)
+ return answer;
+ }
+
+ /* XXX more checks here */
+
+ answer = try_harder(P, B, L);
+#if defined(AFS_S390_LINUX20_ENV) || defined(AFS_S390X_LINUX20_ENV)
+ answer2 = try_harder(P, (PROBETYPE *)(2 + (void *)B), L);
+#ifdef OSI_PROBE_DEBUG
+ if (probe_debug & 0x0005) {
+ printk("<7>osi_probe: %s = 0x%016lx pattern scan (even)\n",
+ P->symbol, (unsigned long)(answer));
+ printk("<7>osi_probe: %s = 0x%016lx pattern scan (odd)\n",
+ P->symbol, (unsigned long)(answer2));
+ }
+#endif
+ if (answer && answer2) answer = 0;
+ else if (answer2) answer = answer2;
+#endif
+ return answer;
+}
+
static void *do_find_syscall_table(probectl *P, char **method)
{
+#ifdef OSI_PROBE_KALLSYMS
char *mod_name, *sec_name, *sym_name;
unsigned long mod_start, mod_end;
unsigned long sec_start, sec_end;
unsigned long sym_start, sym_end;
+ unsigned long token;
+ int ret;
+#endif
PROBETYPE *B;
- unsigned long token, L;
- tryctl *T;
+ unsigned long L;
void *answer;
#ifdef OSI_PROBE_DEBUG
void *final_answer = 0;
#endif
- int ret;
*method = "not found";
check_result(P->weak_answer, "exported");
/* ask the kernel to do the name lookup, if it's willing */
+#ifdef OSI_PROBE_KALLSYMS
if (kallsyms_symbol_to_address) {
token = 0;
sym_start = 0;
} while (ret);
check_result(sym_start, "kallsyms_symbol_to_address");
}
+#endif
/* Maybe a little birdie told us */
check_result(P->parm_answer, "module parameter");
B = (PROBETYPE *)((P->try_base) & ~(P->try_base_mask));
L = P->try_length;
/* Now, see if the kernel will tell us something better than the default */
+#ifdef OSI_PROBE_KALLSYMS
if (kallsyms_address_to_symbol) {
ret = kallsyms_address_to_symbol(P->try_sect_sym,
&mod_name, &mod_start, &mod_end,
L = (sec_end - sec_start) / sizeof(unsigned long);
}
}
-
-#ifdef OSI_PROBE_DEBUG
- if (probe_debug & 0x0007)
- printk("<7>osi_probe: %s base=0x%lx, len=0x%lx\n",
- P->symbol, (unsigned long)B, L);
- if (probe_debug & 0x0009) {
- printk("<7>osi_probe: %s ktxt_lower_bound=0x%lx\n",
- P->symbol, ktxt_lower_bound);
- printk("<7>osi_probe: %s NR_syscalls=%d\n",
- P->symbol, NR_syscalls);
+#endif
+
+ answer = scan_for_syscall_table(P, B, L);
+ check_result(answer, "pattern scan");
+ B = (PROBETYPE *)((P->alt_try_base) & ~(P->alt_try_base_mask));
+ L = P->alt_try_length;
+ /* Now, see if the kernel will tell us something better than the default */
+#ifdef OSI_PROBE_KALLSYMS
+ if (kallsyms_address_to_symbol && P->alt_try_sect_sym) {
+ ret = kallsyms_address_to_symbol(P->alt_try_sect_sym,
+ &mod_name, &mod_start, &mod_end,
+ &sec_name, &sec_start, &sec_end,
+ &sym_name, &sym_start, &sym_end);
+ if (ret) {
+ B = (PROBETYPE *)sec_start;
+ L = (sec_end - sec_start) / sizeof(unsigned long);
+ }
}
#endif
-
- for (T = P->trylist; T->name; T++) {
- answer = try(P, T, B, L);
- check_result(answer, T->name);
+ if (B && L) {
+ answer = scan_for_syscall_table(P, B, L);
+ check_result(answer, "pattern scan");
}
-
- /* XXX more checks here */
-
- answer = try_harder(P, B, L);
- check_result(answer, "pattern scan");
-
#ifdef OSI_PROBE_DEBUG
return final_answer;
#else
#endif
}
+#if defined(AFS_I386_LINUX26_ENV) || defined(AFS_AMD64_LINUX26_ENV)
+static int check_access(unsigned long address, int mode)
+{
+ pgd_t *pgd = pgd_offset_k(address);
+#ifdef PUD_SIZE
+ pud_t *pud;
+#endif
+ pmd_t *pmd;
+ pte_t *pte;
+
+ if (pgd_none(*pgd))
+ return 0;
+#ifdef PUD_SIZE
+ pud = pud_offset(pgd, address);
+ if (pud_none(*pud))
+ return 0;
+ pmd = pmd_offset(pud, address);
+#else
+ pmd = pmd_offset(pgd, address);
+#endif
+ if (pmd_none(*pmd))
+ return 0;
+ if (pmd_large(*pmd))
+ pte = (pte_t *)pmd;
+ else
+ pte = pte_offset_kernel(pmd, address);
+ if (pte_none(*pte) || !pte_present(*pte))
+ return 0;
+ if (mode && !pte_write(*pte))
+ return 0;
+ return 1;
+}
+
+static int check_table_readable(probectl *P, PROBETYPE *ptr)
+{
+ PROBETYPE *next_page;
+ int i = 0, delta;
+
+ while (i < _SS(NR_syscalls)) {
+ next_page = (PROBETYPE *)PAGE_ALIGN((unsigned long)(ptr+1));
+ delta = next_page - ptr;
+ if (!check_access((unsigned long)ptr, 0)) {
+#ifdef OSI_PROBE_DEBUG
+ if (probe_debug & 0x0080)
+ printk("<7>osi_probe: %s 0x%016lx not readable; delta=0x%lx\n",
+ P->symbol, (unsigned long)ptr, delta);
+#endif
+ return delta - 1;
+ }
+ ptr += delta;
+ i += delta;
+ }
+ return -1;
+}
+#endif
+
void *osi_find_syscall_table(int which)
{
probectl *P;
return 0;
}
printk("Found %s at 0x%lx (%s)\n", P->desc, (unsigned long)answer, method);
+#if defined(AFS_I386_LINUX26_ENV) || defined(AFS_AMD64_LINUX26_ENV)
+ if (!check_access((unsigned long)answer, 1)) {
+ printk("Address 0x%lx is not writable.\n", (unsigned long)answer);
+ printk("System call hooks will not be installed; proceeding anyway\n");
+ return 0;
+ }
+#endif
return answer;
}
module_init(osi_probe_init);
module_exit(osi_probe_exit);
#endif
+#endif
+#else
+void *osi_find_syscall_table(int which)
+{
+ return 0;
+}
+#endif /* EXPORTED_INIT_MM */
git://git.openafs.org / openafs.git / blobdiff