RCSID
("$Header$");
+#ifdef AFS_LINUX24_ENV
#include <linux/module.h> /* early to avoid printf->printk mapping */
+#endif
#include "afs/sysincludes.h"
#include "afsincludes.h"
#include "h/unistd.h" /* For syscall numbers. */
#include "h/mm.h"
#ifdef AFS_AMD64_LINUX20_ENV
-#include "../asm/ia32_unistd.h"
+#include <asm/ia32_unistd.h>
#endif
#include <linux/proc_fs.h>
#include <linux/sched.h>
#endif
+#ifndef NR_syscalls
+#define NR_syscalls 222
+#endif
/* On SPARC64 and S390X, sys_call_table contains 32-bit entries
* even though pointers are 64 bit quantities.
#define SYSCALL2POINTER (void *)
#endif
+#if defined(AFS_S390X_LINUX24_ENV)
+#define INSERT_SYSCALL(SLOT, TMPPAGE, FUNC) \
+ if (SYSCALL2POINTER FUNC > 0x7fffffff) { \
+ TMPPAGE = kmalloc ( PAGE_SIZE, GFP_DMA|GFP_KERNEL ); \
+ if (SYSCALL2POINTER TMPPAGE > 0x7fffffff) { \
+ printf("Cannot allocate page for FUNC syscall jump vector\n"); \
+ return EINVAL; \
+ } \
+ memcpy(TMPPAGE, syscall_jump_code, sizeof(syscall_jump_code)); \
+ *(void **)(TMPPAGE + 0x0c) = &FUNC; \
+ afs_sys_call_table[_S(SLOT)] = POINTER2SYSCALL TMPPAGE; \
+ } else \
+ afs_sys_call_table[_S(SLOT)] = POINTER2SYSCALL FUNC;
+#else
+#define INSERT_SYSCALL(SLOT, TMPPAGE, FUNC) \
+ afs_sys_call_table[_S(SLOT)] = POINTER2SYSCALL FUNC;
+#endif
+
#if defined(AFS_S390X_LINUX24_ENV) && !defined(AFS_LINUX26_ENV)
#define _S(x) ((x)<<1)
#elif defined(AFS_IA64_LINUX20_ENV)
static SYSCALLTYPE *afs_sys_call_table;
static SYSCALLTYPE afs_ni_syscall = 0;
-extern long afs_xsetgroups();
+#ifdef AFS_S390X_LINUX24_ENV
+static void *afs_sys_setgroups_page = 0;
+static void *afs_sys_setgroups32_page = 0;
+static void *afs_syscall_page = 0;
+
+/* Because of how the syscall table is handled, we need to ensure our
+ syscalls are within the first 2gb of address space. This means we need
+ self-modifying code we can inject to call our handlers if the module
+ is loaded high. If keyrings had advanced as fast as false protection
+ this would be unnecessary. */
+
+uint32_t syscall_jump_code[] = {
+ 0xe3d0f030, 0x00240dd0, 0xa7f40006, 0xffffffff, 0xffffffff, 0xe310d004,
+ 0x0004e3d0, 0xf0300004, 0x07f10000,
+};
+#endif
+
+extern long afs_xsetgroups(int gidsetsize, gid_t * grouplist);
asmlinkage long (*sys_setgroupsp) (int gidsetsize, gid_t * grouplist);
#ifdef AFS_LINUX24_ENV
-extern int afs_xsetgroups32();
+extern int afs_xsetgroups32(int gidsetsize, gid_t * grouplist);
asmlinkage int (*sys_setgroups32p) (int gidsetsize,
__kernel_gid32_t * grouplist);
#endif
/***** PPC64 *****/
-#ifdef AFS_PPC64_LINUX20_ENV
-extern SYSCALLTYPE *afs_sys_call_table32;
+#ifdef AFS_PPC64_LINUX26_ENV
+static SYSCALLTYPE *afs_sys_call_table32;
static SYSCALLTYPE afs_ni_syscall32 = 0;
+static SYSCALLTYPE old_sys_setgroupsp = 0;
+static SYSCALLTYPE old_sys32_setgroupsp = 0;
extern int afs32_xsetgroups();
asmlinkage long (*sys32_setgroupsp)(int gidsetsize, gid_t *grouplist);
+
+asmlinkage long sys_close(unsigned int fd);
+static void sys_setgroups_stub()
+ __attribute__ ((pure,const,no_instrument_function));
+static void sys_setgroups_stub()
+{
+ printf("*** error! sys_setgroups_stub called\n");
+}
+
+static void sys32_setgroups_stub()
+ __attribute__ ((pure,const,no_instrument_function));
+static void sys32_setgroups_stub()
+{
+ printf("*** error! sys32_setgroups_stub called\n");
+}
+
#endif /* AFS_AMD64_LINUX20_ENV */
/***** SPARC64 *****/
#ifdef AFS_SPARC64_LINUX20_ENV
+#ifdef AFS_SPARC64_LINUX26_ENV
+static SYSCALLTYPE *afs_sys_call_table32;
+#else
extern SYSCALLTYPE *afs_sys_call_table32;
+#endif
static SYSCALLTYPE afs_ni_syscall32 = 0;
extern int afs32_xsetgroups();
+#ifdef AFS_SPARC64_LINUX26_ENV
+asmlinkage int (*sys32_setgroupsp) (int gidsetsize,
+ __kernel_gid32_t * grouplist);
+#else
asmlinkage int (*sys32_setgroupsp) (int gidsetsize,
__kernel_gid_t32 * grouplist);
+#endif
#ifdef AFS_LINUX24_ENV
/* This number is not exported for some bizarre reason. */
#define __NR_setgroups32 82
extern int afs32_xsetgroups32();
+#ifdef AFS_SPARC64_LINUX26_ENV
+asmlinkage int (*sys32_setgroups32p) (int gidsetsize,
+ __kernel_gid32_t * grouplist);
+#else
asmlinkage int (*sys32_setgroups32p) (int gidsetsize,
__kernel_gid_t32 * grouplist);
#endif
+#endif
asmlinkage int
afs_syscall32(long syscall, long parm1, long parm2, long parm3, long parm4,
#endif /* AFS_IA64_LINUX20_ENV */
+/***** PPC64 *****
+ * Spring 2005
+ * sys_call_table hook for PPC64
+ * by Soewono Effendi <Soewono.Effendi@sysgo.de>
+ * for IBM Deutschland
+ * Thanks go to SYSGO's team for their support:
+ * Horst Birthelmer <Horst.Birthelmer@sysgo.de>
+ * Marius Groeger <Marius.Groeger@sysgo.de>
+ */
+#if defined(AFS_PPC64_LINUX26_ENV)
+extern void flush_cache(void *, unsigned long);
+#define PPC_LO(v) ((v) & 0xffff)
+#define PPC_HI(v) (((v) >> 16) & 0xffff)
+#define PPC_HA(v) PPC_HI ((v) + 0x8000)
+#define PPC_HLO(v) ((short)(((v) >> 32) & 0xffff))
+#define PPC_HHI(v) ((short)(((v) >> 48) & 0xffff))
+
+struct ppc64_opd
+{
+ unsigned long funcaddr;
+ unsigned long r2;
+};
+
+struct ppc64_stub
+{
+ unsigned char jump[136];
+ unsigned long r2;
+ unsigned long lr;
+ struct ppc64_opd opd;
+} __attribute__ ((packed));
+
+/* a stub to fix up r2 (TOC ptr) and to jump to our sys_call hook
+ function. We patch the new r2 value and function pointer into
+ the stub. */
+#define PPC64_STUB(stub) \
+static struct ppc64_stub stub = \
+{ .jump = { \
+ 0xf8, 0x41, 0x00, 0x28, /* std r2,40(r1) */ \
+ 0xfb, 0xc1, 0xff, 0xf0, /* std r30,-16(r1) */ \
+ 0xfb, 0xa1, 0xff, 0xe8, /* std r29,-24(r1) */ \
+ 0x7c, 0x5d, 0x13, 0x78, /* mr r29,r2 */ \
+ 0x3c, 0x40, 0x12, 0x34, /*16: lis r2,4660 */ \
+ 0x60, 0x42, 0x56, 0x78, /*20: ori r2,r2,22136 */ \
+ 0x78, 0x42, 0x07, 0xc6, /* rldicr r2,r2,32,31 */ \
+ 0x64, 0x42, 0x90, 0xab, /*28: oris r2,r2,37035 */ \
+ 0x60, 0x42, 0xcd, 0xef, /*32: ori r2,r2,52719 */ \
+ 0x3f, 0xc2, 0x00, 0x00, /*36: addis r30,r2,0 */ \
+ 0x3b, 0xde, 0x00, 0x00, /*40: addi r30,r30,0 */ \
+ 0xfb, 0xbe, 0x00, 0x88, /* std r29,136(r30) */ \
+ 0x7f, 0xa8, 0x02, 0xa6, /* mflr r29 */ \
+ 0xfb, 0xbe, 0x00, 0x90, /* std r29,144(r30) */ \
+ 0xeb, 0xde, 0x00, 0x98, /* ld r30,152(r30) */ \
+ 0x7f, 0xc8, 0x03, 0xa6, /* mtlr r30 */ \
+ 0xeb, 0xa1, 0xff, 0xe8, /* ld r29,-24(r1) */ \
+ 0xeb, 0xc1, 0xff, 0xf0, /* ld r30,-16(r1) */ \
+ 0x4e, 0x80, 0x00, 0x21, /* blrl */ \
+ 0x3c, 0x40, 0x12, 0x34, /*76: lis r2,4660 */ \
+ 0x60, 0x42, 0x56, 0x78, /*80: ori r2,r2,22136 */ \
+ 0x78, 0x42, 0x07, 0xc6, /* rldicr r2,r2,32,31 */ \
+ 0x64, 0x42, 0x90, 0xab, /*88: oris r2,r2,37035 */ \
+ 0x60, 0x42, 0xcd, 0xef, /*92: ori r2,r2,52719 */ \
+ 0xfb, 0xc1, 0xff, 0xf0, /* std r30,-16(r1) */ \
+ 0xfb, 0xa1, 0xff, 0xe8, /* std r29,-24(r1) */ \
+ 0x3f, 0xc2, 0xab, 0xcd, /*104: addis r30,r2,-21555 */ \
+ 0x3b, 0xde, 0x78, 0x90, /*108: addi r30,r30,30864 */ \
+ 0xeb, 0xbe, 0x00, 0x90, /* ld r29,144(r30) */ \
+ 0x7f, 0xa8, 0x03, 0xa6, /* mtlr r29 */ \
+ 0xe8, 0x5e, 0x00, 0x88, /* ld r2,136(r30) */ \
+ 0xeb, 0xa1, 0xff, 0xe8, /* ld r29,-24(r1) */ \
+ 0xeb, 0xc1, 0xff, 0xf0, /* ld r30,-16(r1) */ \
+ 0x4e, 0x80, 0x00, 0x20 /* blr */ \
+}}
+
+static void * create_stub(struct ppc64_stub *stub,
+ struct ppc64_opd *opd)
+{
+ unsigned short *p1, *p2, *p3, *p4;
+ unsigned long addr;
+
+ stub->opd.funcaddr = opd->funcaddr;
+ stub->opd.r2 = opd->r2;
+ addr = (unsigned long) opd->r2;
+ p1 = (unsigned short*) &stub->jump[18];
+ p2 = (unsigned short*) &stub->jump[22];
+ p3 = (unsigned short*) &stub->jump[30];
+ p4 = (unsigned short*) &stub->jump[34];
+
+ *p1 = PPC_HHI(addr);
+ *p2 = PPC_HLO(addr);
+ *p3 = PPC_HI(addr);
+ *p4 = PPC_LO(addr);
+
+ addr = (unsigned long) stub - opd->r2;
+ p1 = (unsigned short*) &stub->jump[38];
+ p2 = (unsigned short*) &stub->jump[42];
+ *p1 = PPC_HA(addr);
+ *p2 = PPC_LO(addr);
+ p1 = (unsigned short*) &stub->jump[106];
+ p2 = (unsigned short*) &stub->jump[110];
+ *p1 = PPC_HA(addr);
+ *p2 = PPC_LO(addr);
+
+ addr = (unsigned long) opd->r2;
+ p1 = (unsigned short*) &stub->jump[78];
+ p2 = (unsigned short*) &stub->jump[82];
+ p3 = (unsigned short*) &stub->jump[90];
+ p4 = (unsigned short*) &stub->jump[94];
+
+ *p1 = PPC_HHI(addr);
+ *p2 = PPC_HLO(addr);
+ *p3 = PPC_HI(addr);
+ *p4 = PPC_LO(addr);
+
+ flush_cache((void *)stub, sizeof(*stub));
+ return ((void*)(stub));
+}
+
+PPC64_STUB(afs_sys_call_stub);
+PPC64_STUB(afs_xsetgroups_stub);
+PPC64_STUB(afs_xsetgroups32_stub);
+#endif /* AFS_PPC64_LINUX26_ENV */
/**********************************************************************/
/* XXX no 32-bit syscalls on IA64? */
-/***** COMMON (except IA64) *****/
+#elif defined(AFS_PPC64_LINUX26_ENV)
+
+ afs_sys_call_table = osi_find_syscall_table(0);
+ if (afs_sys_call_table) {
+ SYSCALLTYPE p;
+ struct ppc64_opd* opd = (struct ppc64_opd*) sys_close;
+ unsigned long r2 = opd->r2;
+ opd = (struct ppc64_opd*) afs_syscall;
+ afs_sys_call_table32 = (unsigned long)afs_sys_call_table -
+ NR_syscalls * sizeof(SYSCALLTYPE);
+ /* check we aren't already loaded */
+ p = SYSCALL2POINTER afs_sys_call_table[_S(__NR_afs_syscall)];
+ if ((unsigned long)p == opd->funcaddr) {
+ printf("AFS syscall entry point already in use!\n");
+ return -EBUSY;
+ }
+ /* setup AFS entry point */
+ p = create_stub(&afs_sys_call_stub, opd);
+ afs_ni_syscall = afs_sys_call_table[_S(__NR_afs_syscall)];
+ afs_sys_call_table[_S(__NR_afs_syscall)] = POINTER2SYSCALL p;
+
+ /* setup setgroups */
+ opd = (struct ppc64_opd*) afs_xsetgroups;
+ p = create_stub(&afs_xsetgroups_stub, opd);
+ old_sys_setgroupsp = SYSCALL2POINTER afs_sys_call_table[_S(__NR_setgroups)];
+ afs_sys_call_table[_S(__NR_setgroups)] = POINTER2SYSCALL p;
+ opd = (struct ppc64_opd*) sys_setgroups_stub;
+ opd->funcaddr = old_sys_setgroupsp;
+ opd->r2 = r2;
+
+ /* setup setgroups32 */
+ opd = (struct ppc64_opd*) afs32_xsetgroups;
+ p = create_stub(&afs_xsetgroups32_stub, opd);
+ old_sys32_setgroupsp = SYSCALL2POINTER afs_sys_call_table32[_S(__NR_setgroups)];
+ afs_sys_call_table32[_S(__NR_setgroups)] = POINTER2SYSCALL p;
+ opd = (struct ppc64_opd*) sys32_setgroups_stub;
+ opd->funcaddr = old_sys32_setgroupsp;
+ opd->r2 = r2;
+
+ flush_cache((void *)afs_sys_call_table, 2*NR_syscalls*sizeof(void*));
+
+ sys_setgroupsp = sys_setgroups_stub;
+ sys32_setgroupsp = sys32_setgroups_stub;
+ }
+/***** COMMON (except IA64 or PPC64) *****/
#else /* !AFS_IA64_LINUX20_ENV */
afs_sys_call_table = osi_find_syscall_table(0);
/* setup AFS entry point */
afs_ni_syscall = afs_sys_call_table[_S(__NR_afs_syscall)];
- afs_sys_call_table[_S(__NR_afs_syscall)] = POINTER2SYSCALL afs_syscall;
+
+ INSERT_SYSCALL(__NR_afs_syscall, afs_syscall_page, afs_syscall)
/* setup setgroups */
sys_setgroupsp = SYSCALL2POINTER afs_sys_call_table[_S(__NR_setgroups)];
- afs_sys_call_table[_S(__NR_setgroups)] = POINTER2SYSCALL afs_xsetgroups;
+ INSERT_SYSCALL(__NR_setgroups, afs_sys_setgroups_page, afs_xsetgroups)
#if defined(__NR_setgroups32)
/* setup setgroups32 */
sys_setgroups32p = SYSCALL2POINTER afs_sys_call_table[__NR_setgroups32];
- afs_sys_call_table[__NR_setgroups32] = POINTER2SYSCALL afs_xsetgroups32;
+ INSERT_SYSCALL(__NR_setgroups32, afs_sys_setgroups32_page, afs_xsetgroups32)
#endif
}
#endif /* !AFS_IA64_LINUX20_ENV */
#endif /* AFS_AMD64_LINUX20_ENV */
-/***** PPC64 *****/
-#ifdef AFS_PPC64_LINUX20_ENV
- /* XXX no 32-bit syscalls on PPC64? */
-#endif
-
-
/***** SPARC64 *****/
#ifdef AFS_SPARC64_LINUX20_ENV
afs_sys_call_table32 = osi_find_syscall_table(1);
#if defined(AFS_IA64_LINUX20_ENV)
afs_sys_call_table[_S(__NR_setgroups)] =
POINTER2SYSCALL((struct fptr *)sys_setgroupsp)->ip;
+#elif defined(AFS_PPC64_LINUX26_ENV)
+ afs_sys_call_table[_S(__NR_setgroups)] =
+ POINTER2SYSCALL old_sys_setgroupsp;
+ /* put back setgroups32 for PPC64 */
+ afs_sys_call_table32[__NR_setgroups] =
+ POINTER2SYSCALL old_sys32_setgroupsp;
#else /* AFS_IA64_LINUX20_ENV */
afs_sys_call_table[_S(__NR_setgroups)] =
POINTER2SYSCALL sys_setgroupsp;
/* put back setgroups32 */
afs_sys_call_table[__NR_setgroups32] = POINTER2SYSCALL sys_setgroups32p;
#endif
+#if defined(AFS_S390X_LINUX24_ENV)
+#if defined(__NR_setgroups32) && !defined(AFS_IA64_LINUX20_ENV)
+ if (afs_sys_setgroups32_page)
+ kfree(afs_sys_setgroups32_page);
+#endif
+ if (afs_sys_setgroups_page)
+ kfree(afs_sys_setgroups_page);
+ if (afs_syscall_page)
+ kfree(afs_syscall_page);
+#endif
}
#endif
-/***** PPC64 *****/
-#ifdef AFS_PPC64_LINUX20_ENV
- /* XXX no 32-bit syscalls on PPC64? */
-#endif
-
-
/***** SPARC64 *****/
#ifdef AFS_SPARC64_LINUX20_ENV
if (afs_sys_call_table32) {
git://git.openafs.org / openafs.git / blobdiff