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Author: mjw
Date: Thu Jan 21 11:37:43 2016
New Revision: 15766
Log:
Bug #357833 Setting RLIMIT_DATA to zero breaks with linux 4.5+
We used to set the process datasize rlimit to zero to prevent
any internal use of brk() from having any effect. But later
linux kernels redefine RLIMIT_DATA as the size of any data
areas, including some dynamic mmap memory allocations.
See bug #357833 for the commit that went into linux 4.5
changing the definition of RLIMIT_DATA. So don't mess with
RLIMIT_DATA anymore. Just remember it for use in the syscall
wrappers.
This also cleans up some hacks around the execv and spawn wrappers.
Modified:
trunk/NEWS
trunk/coregrind/m_libcproc.c
trunk/coregrind/m_main.c
trunk/coregrind/m_syswrap/syswrap-generic.c
trunk/coregrind/m_syswrap/syswrap-solaris.c
Modified: trunk/NEWS
==============================================================================
--- trunk/NEWS (original)
+++ trunk/NEWS Thu Jan 21 11:37:43 2016
@@ -58,6 +58,7 @@
355454 do not intercept malloc related symbols from the runtime linker
356044 Dwarf line info reader misinterprets is_stmt register
356817 valgrind.h triggers compiler errors on MSVC when defining NVALGRIND
+357833 Setting RLIMIT_DATA to zero breaks with linux 4.5+
357871 pthread_spin_destroy not properly wrapped
357887 Fix a file handle leak. VG_(fclose) did not close the file
358030 support direct socket calls on x86 32bit (new in linux 4.3)
Modified: trunk/coregrind/m_libcproc.c
==============================================================================
--- trunk/coregrind/m_libcproc.c (original)
+++ trunk/coregrind/m_libcproc.c Thu Jan 21 11:37:43 2016
@@ -450,9 +450,6 @@
HChar** envp;
SysRes res;
- /* restore the DATA rlimit for the child */
- VG_(setrlimit)(VKI_RLIMIT_DATA, &VG_(client_rlimit_data));
-
envp = VG_(env_clone)(VG_(client_envp));
VG_(env_remove_valgrind_env_stuff)( envp, True /*ro_strings*/, NULL );
@@ -511,17 +508,9 @@
# undef COPY_CHAR_TO_ARGENV
# undef COPY_STRING_TOARGENV
- /* HACK: Temporarily restore the DATA rlimit for spawned child. */
- VG_(setrlimit)(VKI_RLIMIT_DATA, &VG_(client_rlimit_data));
-
SysRes res = VG_(do_syscall5)(__NR_spawn, (UWord) filename, (UWord) NULL, 0,
(UWord) argenv, argenv_size);
- /* Restore DATA rlimit back to its previous value set in m_main.c. */
- struct vki_rlimit zero = { 0, 0 };
- zero.rlim_max = VG_(client_rlimit_data).rlim_max;
- VG_(setrlimit)(VKI_RLIMIT_DATA, &zero);
-
VG_(free)(argenv);
for (HChar **p = envp; *p != NULL; p++) {
VG_(free)(*p);
Modified: trunk/coregrind/m_main.c
==============================================================================
--- trunk/coregrind/m_main.c (original)
+++ trunk/coregrind/m_main.c Thu Jan 21 11:37:43 2016
@@ -1627,7 +1627,6 @@
Bool logging_to_fd = False;
const HChar* xml_fname_unexpanded = NULL;
Int loglevel, i;
- struct vki_rlimit zero = { 0, 0 };
XArray* addr2dihandle = NULL;
//============================================================
@@ -1800,13 +1799,15 @@
VG_(debugLog)(1, "main", "... %s\n", VG_(name_of_launcher));
//--------------------------------------------------------------
- // Get the current process datasize rlimit, and set it to zero.
- // This prevents any internal uses of brk() from having any effect.
- // We remember the old value so we can restore it on exec, so that
- // child processes will have a reasonable brk value.
+ // We used to set the process datasize rlimit to zero to prevent
+ // any internal use of brk() from having any effect. But later
+ // linux kernels redefine RLIMIT_DATA as the size of any data
+ // areas, including some dynamic mmap memory allocations.
+ // See bug #357833 for the commit that went into linux 4.5
+ // changing the definition of RLIMIT_DATA. So don't mess with
+ // RLIMIT_DATA here now anymore. Just remember it for use in
+ // the syscall wrappers.
VG_(getrlimit)(VKI_RLIMIT_DATA, &VG_(client_rlimit_data));
- zero.rlim_max = VG_(client_rlimit_data).rlim_max;
- VG_(setrlimit)(VKI_RLIMIT_DATA, &zero);
// Get the current process stack rlimit.
VG_(getrlimit)(VKI_RLIMIT_STACK, &VG_(client_rlimit_stack));
Modified: trunk/coregrind/m_syswrap/syswrap-generic.c
==============================================================================
--- trunk/coregrind/m_syswrap/syswrap-generic.c (original)
+++ trunk/coregrind/m_syswrap/syswrap-generic.c Thu Jan 21 11:37:43 2016
@@ -3014,9 +3014,6 @@
vg_assert(j == tot_args+1);
}
- /* restore the DATA rlimit for the child */
- VG_(setrlimit)(VKI_RLIMIT_DATA, &VG_(client_rlimit_data));
-
/*
Set the signal state up for exec.
Modified: trunk/coregrind/m_syswrap/syswrap-solaris.c
==============================================================================
--- trunk/coregrind/m_syswrap/syswrap-solaris.c (original)
+++ trunk/coregrind/m_syswrap/syswrap-solaris.c Thu Jan 21 11:37:43 2016
@@ -1589,21 +1589,12 @@
#undef COPY_CHAR_TO_ARGENV
#undef COPY_STRING_TOARGENV
- /* HACK: Temporarily restore the DATA rlimit for spawned child.
- This is a terrible hack to provide sensible brk limit for child. */
- VG_(setrlimit)(VKI_RLIMIT_DATA, &VG_(client_rlimit_data));
-
/* Actual spawn() syscall. */
SysRes res = VG_(do_syscall5)(__NR_spawn, (UWord) path, (UWord) attrs,
attrs_size, (UWord) argenv, argenv_size);
SET_STATUS_from_SysRes(res);
VG_(free)(argenv);
- /* Restore DATA rlimit back to its previous value set in m_main.c. */
- struct vki_rlimit zero = { 0, 0 };
- zero.rlim_max = VG_(client_rlimit_data).rlim_max;
- VG_(setrlimit)(VKI_RLIMIT_DATA, &zero);
-
if (SUCCESS) {
PRINT(" spawn: process %d spawned child %ld\n", VG_(getpid)(), RES);
}
@@ -3794,9 +3785,6 @@
VG_(sigprocmask)(VKI_SIG_SETMASK, &tst->sig_mask, NULL);
}
- /* Restore the DATA rlimit for the child. */
- VG_(setrlimit)(VKI_RLIMIT_DATA, &VG_(client_rlimit_data));
-
/* Debug-only printing. */
if (0) {
HChar **cpp;
|