--- /dev/null
+/*
+ * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
+ * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
+ * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
+ * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
+ * Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Linux for s390 port by D.J. Barrow
+ * <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
+ * Copyright (c) 1999-2017 The strace developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "defs.h"
+#include <sys/uio.h>
+#include <asm/unistd.h>
+
+#include "scno.h"
+#include "ptrace.h"
+
+static bool process_vm_readv_not_supported;
+
+#ifndef HAVE_PROCESS_VM_READV
+/*
+ * Need to do this since process_vm_readv() is not yet available in libc.
+ * When libc is updated, only "static bool process_vm_readv_not_supported"
+ * line remains.
+ * The name is different to avoid potential collision with OS headers.
+ */
+static ssize_t strace_process_vm_readv(pid_t pid,
+ const struct iovec *lvec,
+ unsigned long liovcnt,
+ const struct iovec *rvec,
+ unsigned long riovcnt,
+ unsigned long flags)
+{
+ return syscall(__NR_process_vm_readv,
+ (long) pid, lvec, liovcnt, rvec, riovcnt, flags);
+}
+# define process_vm_readv strace_process_vm_readv
+#endif /* !HAVE_PROCESS_VM_READV */
+
+static ssize_t
+vm_read_mem(const pid_t pid, void *const laddr,
+ const kernel_ulong_t raddr, const size_t len)
+{
+ const unsigned long truncated_raddr = raddr;
+
+ if (raddr != (kernel_ulong_t) truncated_raddr) {
+ errno = EIO;
+ return -1;
+ }
+
+ const struct iovec local = {
+ .iov_base = laddr,
+ .iov_len = len
+ };
+ const struct iovec remote = {
+ .iov_base = (void *) truncated_raddr,
+ .iov_len = len
+ };
+
+ return process_vm_readv(pid, &local, 1, &remote, 1, 0);
+}
+
+/*
+ * Copy `len' bytes of data from process `pid'
+ * at address `addr' to our space at `our_addr'.
+ */
+int
+umoven(struct tcb *const tcp, kernel_ulong_t addr, unsigned int len,
+ void *const our_addr)
+{
+ char *laddr = our_addr;
+ int pid = tcp->pid;
+ unsigned int n, m, nread;
+ union {
+ long val;
+ char x[sizeof(long)];
+ } u;
+
+#if ANY_WORDSIZE_LESS_THAN_KERNEL_LONG
+ if (current_wordsize < sizeof(addr)
+ && (addr & (~(kernel_ulong_t) -1U))) {
+ return -1;
+ }
+#endif
+
+ if (!process_vm_readv_not_supported) {
+ int r = vm_read_mem(pid, laddr, addr, len);
+ if ((unsigned int) r == len)
+ return 0;
+ if (r >= 0) {
+ error_msg("umoven: short read (%u < %u) @0x%" PRI_klx,
+ (unsigned int) r, len, addr);
+ return -1;
+ }
+ switch (errno) {
+ case ENOSYS:
+ process_vm_readv_not_supported = 1;
+ break;
+ case EPERM:
+ /* operation not permitted, try PTRACE_PEEKDATA */
+ break;
+ case ESRCH:
+ /* the process is gone */
+ return -1;
+ case EFAULT: case EIO:
+ /* address space is inaccessible */
+ return -1;
+ default:
+ /* all the rest is strange and should be reported */
+ perror_msg("process_vm_readv");
+ return -1;
+ }
+ }
+
+ nread = 0;
+ if (addr & (sizeof(long) - 1)) {
+ /* addr not a multiple of sizeof(long) */
+ n = addr & (sizeof(long) - 1); /* residue */
+ addr &= -sizeof(long); /* aligned address */
+ errno = 0;
+ u.val = ptrace(PTRACE_PEEKDATA, pid, addr, 0);
+ switch (errno) {
+ case 0:
+ break;
+ case ESRCH: case EINVAL:
+ /* these could be seen if the process is gone */
+ return -1;
+ case EFAULT: case EIO: case EPERM:
+ /* address space is inaccessible */
+ return -1;
+ default:
+ /* all the rest is strange and should be reported */
+ perror_msg("umoven: PTRACE_PEEKDATA pid:%d @0x%" PRI_klx,
+ pid, addr);
+ return -1;
+ }
+ m = MIN(sizeof(long) - n, len);
+ memcpy(laddr, &u.x[n], m);
+ addr += sizeof(long);
+ laddr += m;
+ nread += m;
+ len -= m;
+ }
+ while (len) {
+ errno = 0;
+ u.val = ptrace(PTRACE_PEEKDATA, pid, addr, 0);
+ switch (errno) {
+ case 0:
+ break;
+ case ESRCH: case EINVAL:
+ /* these could be seen if the process is gone */
+ return -1;
+ case EFAULT: case EIO: case EPERM:
+ /* address space is inaccessible */
+ if (nread) {
+ perror_msg("umoven: short read (%u < %u) @0x%" PRI_klx,
+ nread, nread + len, addr - nread);
+ }
+ return -1;
+ default:
+ /* all the rest is strange and should be reported */
+ perror_msg("umoven: PTRACE_PEEKDATA pid:%d @0x%" PRI_klx,
+ pid, addr);
+ return -1;
+ }
+ m = MIN(sizeof(long), len);
+ memcpy(laddr, u.x, m);
+ addr += sizeof(long);
+ laddr += m;
+ nread += m;
+ len -= m;
+ }
+
+ return 0;
+}
+
+/*
+ * Like `umove' but make the additional effort of looking
+ * for a terminating zero byte.
+ *
+ * Returns < 0 on error, > 0 if NUL was seen,
+ * (TODO if useful: return count of bytes including NUL),
+ * else 0 if len bytes were read but no NUL byte seen.
+ *
+ * Note: there is no guarantee we won't overwrite some bytes
+ * in laddr[] _after_ terminating NUL (but, of course,
+ * we never write past laddr[len-1]).
+ */
+int
+umovestr(struct tcb *const tcp, kernel_ulong_t addr, unsigned int len, char *laddr)
+{
+ const unsigned long x01010101 = (unsigned long) 0x0101010101010101ULL;
+ const unsigned long x80808080 = (unsigned long) 0x8080808080808080ULL;
+
+ int pid = tcp->pid;
+ unsigned int n, m, nread;
+ union {
+ unsigned long val;
+ char x[sizeof(long)];
+ } u;
+
+#if ANY_WORDSIZE_LESS_THAN_KERNEL_LONG
+ if (current_wordsize < sizeof(addr)
+ && (addr & (~(kernel_ulong_t) -1U))) {
+ return -1;
+ }
+#endif
+
+ nread = 0;
+ if (!process_vm_readv_not_supported) {
+ const size_t page_size = get_pagesize();
+ const size_t page_mask = page_size - 1;
+
+ while (len > 0) {
+ unsigned int chunk_len;
+ unsigned int end_in_page;
+
+ /*
+ * Don't cross pages, otherwise we can get EFAULT
+ * and fail to notice that terminating NUL lies
+ * in the existing (first) page.
+ */
+ chunk_len = len > page_size ? page_size : len;
+ end_in_page = (addr + chunk_len) & page_mask;
+ if (chunk_len > end_in_page) /* crosses to the next page */
+ chunk_len -= end_in_page;
+
+ int r = vm_read_mem(pid, laddr, addr, chunk_len);
+ if (r > 0) {
+ if (memchr(laddr, '\0', r))
+ return 1;
+ addr += r;
+ laddr += r;
+ nread += r;
+ len -= r;
+ continue;
+ }
+ switch (errno) {
+ case ENOSYS:
+ process_vm_readv_not_supported = 1;
+ goto vm_readv_didnt_work;
+ case ESRCH:
+ /* the process is gone */
+ return -1;
+ case EPERM:
+ /* operation not permitted, try PTRACE_PEEKDATA */
+ if (!nread)
+ goto vm_readv_didnt_work;
+ /* fall through */
+ case EFAULT: case EIO:
+ /* address space is inaccessible */
+ if (nread) {
+ perror_msg("umovestr: short read (%d < %d) @0x%" PRI_klx,
+ nread, nread + len, addr - nread);
+ }
+ return -1;
+ default:
+ /* all the rest is strange and should be reported */
+ perror_msg("process_vm_readv");
+ return -1;
+ }
+ }
+ return 0;
+ }
+ vm_readv_didnt_work:
+
+ if (addr & (sizeof(long) - 1)) {
+ /* addr not a multiple of sizeof(long) */
+ n = addr & (sizeof(long) - 1); /* residue */
+ addr &= -sizeof(long); /* aligned address */
+ errno = 0;
+ u.val = ptrace(PTRACE_PEEKDATA, pid, addr, 0);
+ switch (errno) {
+ case 0:
+ break;
+ case ESRCH: case EINVAL:
+ /* these could be seen if the process is gone */
+ return -1;
+ case EFAULT: case EIO: case EPERM:
+ /* address space is inaccessible */
+ return -1;
+ default:
+ /* all the rest is strange and should be reported */
+ perror_msg("umovestr: PTRACE_PEEKDATA pid:%d @0x%" PRI_klx,
+ pid, addr);
+ return -1;
+ }
+ m = MIN(sizeof(long) - n, len);
+ memcpy(laddr, &u.x[n], m);
+ while (n & (sizeof(long) - 1))
+ if (u.x[n++] == '\0')
+ return 1;
+ addr += sizeof(long);
+ laddr += m;
+ nread += m;
+ len -= m;
+ }
+
+ while (len) {
+ errno = 0;
+ u.val = ptrace(PTRACE_PEEKDATA, pid, addr, 0);
+ switch (errno) {
+ case 0:
+ break;
+ case ESRCH: case EINVAL:
+ /* these could be seen if the process is gone */
+ return -1;
+ case EFAULT: case EIO: case EPERM:
+ /* address space is inaccessible */
+ if (nread) {
+ perror_msg("umovestr: short read (%d < %d) @0x%" PRI_klx,
+ nread, nread + len, addr - nread);
+ }
+ return -1;
+ default:
+ /* all the rest is strange and should be reported */
+ perror_msg("umovestr: PTRACE_PEEKDATA pid:%d @0x%" PRI_klx,
+ pid, addr);
+ return -1;
+ }
+ m = MIN(sizeof(long), len);
+ memcpy(laddr, u.x, m);
+ /* "If a NUL char exists in this word" */
+ if ((u.val - x01010101) & ~u.val & x80808080)
+ return 1;
+ addr += sizeof(long);
+ laddr += m;
+ nread += m;
+ len -= m;
+ }
+ return 0;
+}
# include <sys/xattr.h>
#endif
#include <sys/uio.h>
-#include <asm/unistd.h>
-
-#include "scno.h"
-#include "regs.h"
-#include "ptrace.h"
int
string_to_uint_ex(const char *const str, char **const endptr,
}
}
-static bool process_vm_readv_not_supported;
-
-#ifndef HAVE_PROCESS_VM_READV
-/*
- * Need to do this since process_vm_readv() is not yet available in libc.
- * When libc is be updated, only "static bool process_vm_readv_not_supported"
- * line should remain.
- */
-/* Have to avoid duplicating with the C library headers. */
-static ssize_t strace_process_vm_readv(pid_t pid,
- const struct iovec *lvec,
- unsigned long liovcnt,
- const struct iovec *rvec,
- unsigned long riovcnt,
- unsigned long flags)
-{
- return syscall(__NR_process_vm_readv, (long)pid, lvec, liovcnt, rvec, riovcnt, flags);
-}
-# define process_vm_readv strace_process_vm_readv
-#endif /* !HAVE_PROCESS_VM_READV */
-
-static ssize_t
-vm_read_mem(const pid_t pid, void *const laddr,
- const kernel_ulong_t raddr, const size_t len)
-{
- const unsigned long truncated_raddr = raddr;
-
- if (raddr != (kernel_ulong_t) truncated_raddr) {
- errno = EIO;
- return -1;
- }
-
- const struct iovec local = {
- .iov_base = laddr,
- .iov_len = len
- };
- const struct iovec remote = {
- .iov_base = (void *) truncated_raddr,
- .iov_len = len
- };
-
- return process_vm_readv(pid, &local, 1, &remote, 1, 0);
-}
-
-/*
- * move `len' bytes of data from process `pid'
- * at address `addr' to our space at `our_addr'
- */
-int
-umoven(struct tcb *const tcp, kernel_ulong_t addr, unsigned int len,
- void *const our_addr)
-{
- char *laddr = our_addr;
- int pid = tcp->pid;
- unsigned int n, m, nread;
- union {
- long val;
- char x[sizeof(long)];
- } u;
-
-#if ANY_WORDSIZE_LESS_THAN_KERNEL_LONG
- if (current_wordsize < sizeof(addr)
- && (addr & (~(kernel_ulong_t) -1U))) {
- return -1;
- }
-#endif
-
- if (!process_vm_readv_not_supported) {
- int r = vm_read_mem(pid, laddr, addr, len);
- if ((unsigned int) r == len)
- return 0;
- if (r >= 0) {
- error_msg("umoven: short read (%u < %u) @0x%" PRI_klx,
- (unsigned int) r, len, addr);
- return -1;
- }
- switch (errno) {
- case ENOSYS:
- process_vm_readv_not_supported = 1;
- break;
- case EPERM:
- /* operation not permitted, try PTRACE_PEEKDATA */
- break;
- case ESRCH:
- /* the process is gone */
- return -1;
- case EFAULT: case EIO:
- /* address space is inaccessible */
- return -1;
- default:
- /* all the rest is strange and should be reported */
- perror_msg("process_vm_readv");
- return -1;
- }
- }
-
- nread = 0;
- if (addr & (sizeof(long) - 1)) {
- /* addr not a multiple of sizeof(long) */
- n = addr & (sizeof(long) - 1); /* residue */
- addr &= -sizeof(long); /* aligned address */
- errno = 0;
- u.val = ptrace(PTRACE_PEEKDATA, pid, addr, 0);
- switch (errno) {
- case 0:
- break;
- case ESRCH: case EINVAL:
- /* these could be seen if the process is gone */
- return -1;
- case EFAULT: case EIO: case EPERM:
- /* address space is inaccessible */
- return -1;
- default:
- /* all the rest is strange and should be reported */
- perror_msg("umoven: PTRACE_PEEKDATA pid:%d @0x%" PRI_klx,
- pid, addr);
- return -1;
- }
- m = MIN(sizeof(long) - n, len);
- memcpy(laddr, &u.x[n], m);
- addr += sizeof(long);
- laddr += m;
- nread += m;
- len -= m;
- }
- while (len) {
- errno = 0;
- u.val = ptrace(PTRACE_PEEKDATA, pid, addr, 0);
- switch (errno) {
- case 0:
- break;
- case ESRCH: case EINVAL:
- /* these could be seen if the process is gone */
- return -1;
- case EFAULT: case EIO: case EPERM:
- /* address space is inaccessible */
- if (nread) {
- perror_msg("umoven: short read (%u < %u) @0x%" PRI_klx,
- nread, nread + len, addr - nread);
- }
- return -1;
- default:
- /* all the rest is strange and should be reported */
- perror_msg("umoven: PTRACE_PEEKDATA pid:%d @0x%" PRI_klx,
- pid, addr);
- return -1;
- }
- m = MIN(sizeof(long), len);
- memcpy(laddr, u.x, m);
- addr += sizeof(long);
- laddr += m;
- nread += m;
- len -= m;
- }
-
- return 0;
-}
-
int
umoven_or_printaddr(struct tcb *const tcp, const kernel_ulong_t addr,
const unsigned int len, void *const our_addr)
return 0;
}
-/*
- * Like `umove' but make the additional effort of looking
- * for a terminating zero byte.
- *
- * Returns < 0 on error, > 0 if NUL was seen,
- * (TODO if useful: return count of bytes including NUL),
- * else 0 if len bytes were read but no NUL byte seen.
- *
- * Note: there is no guarantee we won't overwrite some bytes
- * in laddr[] _after_ terminating NUL (but, of course,
- * we never write past laddr[len-1]).
- */
-int
-umovestr(struct tcb *const tcp, kernel_ulong_t addr, unsigned int len, char *laddr)
-{
- const unsigned long x01010101 = (unsigned long) 0x0101010101010101ULL;
- const unsigned long x80808080 = (unsigned long) 0x8080808080808080ULL;
-
- int pid = tcp->pid;
- unsigned int n, m, nread;
- union {
- unsigned long val;
- char x[sizeof(long)];
- } u;
-
-#if ANY_WORDSIZE_LESS_THAN_KERNEL_LONG
- if (current_wordsize < sizeof(addr)
- && (addr & (~(kernel_ulong_t) -1U))) {
- return -1;
- }
-#endif
-
- nread = 0;
- if (!process_vm_readv_not_supported) {
- const size_t page_size = get_pagesize();
- const size_t page_mask = page_size - 1;
-
- while (len > 0) {
- unsigned int chunk_len;
- unsigned int end_in_page;
-
- /*
- * Don't cross pages, otherwise we can get EFAULT
- * and fail to notice that terminating NUL lies
- * in the existing (first) page.
- */
- chunk_len = len > page_size ? page_size : len;
- end_in_page = (addr + chunk_len) & page_mask;
- if (chunk_len > end_in_page) /* crosses to the next page */
- chunk_len -= end_in_page;
-
- int r = vm_read_mem(pid, laddr, addr, chunk_len);
- if (r > 0) {
- if (memchr(laddr, '\0', r))
- return 1;
- addr += r;
- laddr += r;
- nread += r;
- len -= r;
- continue;
- }
- switch (errno) {
- case ENOSYS:
- process_vm_readv_not_supported = 1;
- goto vm_readv_didnt_work;
- case ESRCH:
- /* the process is gone */
- return -1;
- case EPERM:
- /* operation not permitted, try PTRACE_PEEKDATA */
- if (!nread)
- goto vm_readv_didnt_work;
- /* fall through */
- case EFAULT: case EIO:
- /* address space is inaccessible */
- if (nread) {
- perror_msg("umovestr: short read (%d < %d) @0x%" PRI_klx,
- nread, nread + len, addr - nread);
- }
- return -1;
- default:
- /* all the rest is strange and should be reported */
- perror_msg("process_vm_readv");
- return -1;
- }
- }
- return 0;
- }
- vm_readv_didnt_work:
-
- if (addr & (sizeof(long) - 1)) {
- /* addr not a multiple of sizeof(long) */
- n = addr & (sizeof(long) - 1); /* residue */
- addr &= -sizeof(long); /* aligned address */
- errno = 0;
- u.val = ptrace(PTRACE_PEEKDATA, pid, addr, 0);
- switch (errno) {
- case 0:
- break;
- case ESRCH: case EINVAL:
- /* these could be seen if the process is gone */
- return -1;
- case EFAULT: case EIO: case EPERM:
- /* address space is inaccessible */
- return -1;
- default:
- /* all the rest is strange and should be reported */
- perror_msg("umovestr: PTRACE_PEEKDATA pid:%d @0x%" PRI_klx,
- pid, addr);
- return -1;
- }
- m = MIN(sizeof(long) - n, len);
- memcpy(laddr, &u.x[n], m);
- while (n & (sizeof(long) - 1))
- if (u.x[n++] == '\0')
- return 1;
- addr += sizeof(long);
- laddr += m;
- nread += m;
- len -= m;
- }
-
- while (len) {
- errno = 0;
- u.val = ptrace(PTRACE_PEEKDATA, pid, addr, 0);
- switch (errno) {
- case 0:
- break;
- case ESRCH: case EINVAL:
- /* these could be seen if the process is gone */
- return -1;
- case EFAULT: case EIO: case EPERM:
- /* address space is inaccessible */
- if (nread) {
- perror_msg("umovestr: short read (%d < %d) @0x%" PRI_klx,
- nread, nread + len, addr - nread);
- }
- return -1;
- default:
- /* all the rest is strange and should be reported */
- perror_msg("umovestr: PTRACE_PEEKDATA pid:%d @0x%" PRI_klx,
- pid, addr);
- return -1;
- }
- m = MIN(sizeof(long), len);
- memcpy(laddr, u.x, m);
- /* "If a NUL char exists in this word" */
- if ((u.val - x01010101) & ~u.val & x80808080)
- return 1;
- addr += sizeof(long);
- laddr += m;
- nread += m;
- len -= m;
- }
- return 0;
-}
-
/*
* Iteratively fetch and print up to nmemb elements of elem_size size
* from the array that starts at tracee's address start_addr.
projects / strace / commitdiff