407307 Intercept stpcpy also in ld.so for arm64
407764 drd cond_post_wait gets wrong (?) condition on s390x z13 system
408009 Expose rdrand and f16c even on avx if host cpu supports them
+408091 Missing pkey syscalls
n-i-bz Fix minor one time leaks in dhat.
n-i-bz Add --run-cxx-freeres=no in outer args to avoid inner crashes.
ML_(handle_auxv_open)(SyscallStatus *status, const HChar *filename,
int flags);
+/* Helper function for generic mprotect and linux pkey_mprotect. */
+extern void handle_sys_mprotect (ThreadId tid, SyscallStatus *status,
+ Addr *addr, SizeT *len, Int *prot);
+
DECL_TEMPLATE(generic, sys_ni_syscall); // * P -- unimplemented
DECL_TEMPLATE(generic, sys_exit);
DECL_TEMPLATE(generic, sys_fork);
// Linux-specific (new in Linux 4.11)
DECL_TEMPLATE(linux, sys_statx);
+// Linux-specific memory protection key syscalls (since Linux 4.9)
+DECL_TEMPLATE(linux, sys_pkey_alloc);
+DECL_TEMPLATE(linux, sys_pkey_free);
+DECL_TEMPLATE(linux, sys_pkey_mprotect);
+
/* ---------------------------------------------------------------------
Wrappers for sockets and ipc-ery. These are split into standalone
procedures because x86-linux hides them inside multiplexors
LINX_(__NR_membarrier, sys_membarrier), // 324
LINX_(__NR_copy_file_range, sys_copy_file_range), // 326
+
+ LINXY(__NR_pkey_mprotect, sys_pkey_mprotect), // 329
+ LINX_(__NR_pkey_alloc, sys_pkey_alloc), // 330
+ LINX_(__NR_pkey_free, sys_pkey_free), // 331
};
SyscallTableEntry* ML_(get_linux_syscall_entry) ( UInt sysno )
PRE_REG_READ3(long, "mprotect",
unsigned long, addr, vki_size_t, len, unsigned long, prot);
- if (!ML_(valid_client_addr)(ARG1, ARG2, tid, "mprotect")) {
+ Addr addr = ARG1;
+ SizeT len = ARG2;
+ Int prot = ARG3;
+
+ handle_sys_mprotect (tid, status, &addr, &len, &prot);
+
+ ARG1 = addr;
+ ARG2 = len;
+ ARG3 = prot;
+}
+/* This will be called from the generic mprotect, or the linux specific
+ pkey_mprotect. Pass pointers to ARG1, ARG2 and ARG3 as addr, len and prot,
+ they might be adjusted and have to assigned back to ARG1, ARG2 and ARG3. */
+void handle_sys_mprotect(ThreadId tid, SyscallStatus* status,
+ Addr *addr, SizeT *len, Int *prot)
+{
+ if (!ML_(valid_client_addr)(*addr, *len, tid, "mprotect")) {
SET_STATUS_Failure( VKI_ENOMEM );
}
#if defined(VKI_PROT_GROWSDOWN)
else
- if (ARG3 & (VKI_PROT_GROWSDOWN|VKI_PROT_GROWSUP)) {
+ if (*prot & (VKI_PROT_GROWSDOWN|VKI_PROT_GROWSUP)) {
/* Deal with mprotects on growable stack areas.
The critical files to understand all this are mm/mprotect.c
The sanity check provided by the kernel is that the vma must
have the VM_GROWSDOWN/VM_GROWSUP flag set as appropriate. */
- UInt grows = ARG3 & (VKI_PROT_GROWSDOWN|VKI_PROT_GROWSUP);
- NSegment const *aseg = VG_(am_find_nsegment)(ARG1);
+ UInt grows = *prot & (VKI_PROT_GROWSDOWN|VKI_PROT_GROWSUP);
+ NSegment const *aseg = VG_(am_find_nsegment)(*addr);
NSegment const *rseg;
vg_assert(aseg);
&& rseg->kind == SkResvn
&& rseg->smode == SmUpper
&& rseg->end+1 == aseg->start) {
- Addr end = ARG1 + ARG2;
- ARG1 = aseg->start;
- ARG2 = end - aseg->start;
- ARG3 &= ~VKI_PROT_GROWSDOWN;
+ Addr end = *addr + *len;
+ *addr = aseg->start;
+ *len = end - aseg->start;
+ *prot &= ~VKI_PROT_GROWSDOWN;
} else {
SET_STATUS_Failure( VKI_EINVAL );
}
&& rseg->kind == SkResvn
&& rseg->smode == SmLower
&& aseg->end+1 == rseg->start) {
- ARG2 = aseg->end - ARG1 + 1;
- ARG3 &= ~VKI_PROT_GROWSUP;
+ *len = aseg->end - *addr + 1;
+ *prot &= ~VKI_PROT_GROWSUP;
} else {
SET_STATUS_Failure( VKI_EINVAL );
}
}
}
+PRE(sys_pkey_alloc)
+{
+ PRINT("pkey_alloc (%lu, %lu)", ARG1, ARG2);
+
+ PRE_REG_READ2(long, "pkey_alloc",
+ unsigned long, "flags",
+ unsigned long, "access_rights");
+
+ /* The kernel says: pkey_alloc() is always safe to call regardless of
+ whether or not the operating system supports protection keys. It can be
+ used in lieu of any other mechanism for detecting pkey support and will
+ simply fail with the error ENOSPC if the operating system has no pkey
+ support.
+
+ So we simply always return ENOSPC to signal memory protection keys are
+ not supported under valgrind, unless there are unknown flags, then we
+ return EINVAL. */
+ unsigned long pkey_flags = ARG1;
+ if (pkey_flags != 0)
+ SET_STATUS_Failure( VKI_EINVAL );
+ else
+ SET_STATUS_Failure( VKI_ENOSPC );
+}
+
+PRE(sys_pkey_free)
+{
+ PRINT("pkey_free (%" FMT_REGWORD "u )", ARG1);
+
+ PRE_REG_READ1(long, "pkey_free",
+ unsigned long, "pkey");
+
+ /* Since pkey_alloc () can never succeed, see above, freeing any pkey is
+ always an error. */
+ SET_STATUS_Failure( VKI_EINVAL );
+}
+
+PRE(sys_pkey_mprotect)
+{
+ PRINT("sys_pkey_mprotect ( %#" FMT_REGWORD "x, %" FMT_REGWORD "u, %"
+ FMT_REGWORD "u %" FMT_REGWORD "u )", ARG1, ARG2, ARG3, ARG4);
+ PRE_REG_READ4(long, "pkey_mprotect",
+ unsigned long, addr, vki_size_t, len, unsigned long, prot,
+ unsigned long, pkey);
+
+ Addr addr = ARG1;
+ SizeT len = ARG2;
+ Int prot = ARG3;
+ Int pkey = ARG4;
+
+ /* Since pkey_alloc () can never succeed, see above, any pkey is
+ invalid. Except for -1, then pkey_mprotect acts just like mprotect. */
+ if (pkey != -1)
+ SET_STATUS_Failure( VKI_EINVAL );
+ else
+ handle_sys_mprotect (tid, status, &addr, &len, &prot);
+
+ ARG1 = addr;
+ ARG2 = len;
+ ARG3 = prot;
+}
+
+POST(sys_pkey_mprotect)
+{
+ Addr addr = ARG1;
+ SizeT len = ARG2;
+ Int prot = ARG3;
+
+ ML_(notify_core_and_tool_of_mprotect)(addr, len, prot);
+}
+
#undef PRE
#undef POST
LINX_(__NR_copy_file_range, sys_copy_file_range), // 377
+ LINXY(__NR_pkey_mprotect, sys_pkey_mprotect), // 380
+ LINX_(__NR_pkey_alloc, sys_pkey_alloc), // 381
+ LINX_(__NR_pkey_free, sys_pkey_free), // 382
LINXY(__NR_statx, sys_statx), // 383
/* Explicitly not supported on i386 yet. */
projects / thirdparty / valgrind.git / commitdiff
