Implement correct RLIMIT_STACK handling
* miscfuncs.cc (struct pthread_wrapper_arg): Add member guardsize.
(pthread_wrapper): Set thread stack guarantee according to guardsize.
Tweak assembler code so that $rax/$eax is not required by GCC to
prepare the wrapper_arg value.
(CygwinCreateThread): Fix deadzone handling. Drop setting a "POSIX"
guardpage (aka page w/ PAGE_NOACCESS). Always use Windows guard
pages instead. On post-XP systems (providing SetThreadStackGuarantee)
always set up stack Windows like with reserved/commited areas and
movable guard pages. Only on XP set up stack fully commited if the
guardpage size is not the default system guardpage size.
Fill out pthread_wrapper_arg::guardsize. Improve comments.
* resource.cc: Implement RSTACK_LIMIT Linux-like.
(DEFAULT_STACKSIZE): New macro.
(DEFAULT_STACKGUARD): Ditto.
(rlimit_stack_guard): New muto.
(rlimit_stack): New global variable holding current RSTACK_LIMIT values.
(__set_rlimit_stack): Set rlimit_stack under lock.
(__get_rlimit_stack): Initialize rlimit_stack from executable header
and return rlimit_stack values under lock.
(get_rlimit_stack): Filtering function to return useful default
stacksize from rlimit_stack.rlim_cur value.
(getrlimit): Call __get_rlimit_stack in RLIMIT_STACK case.
(setrlimit): Call __set_rlimit_stack in RLIMIT_STACK case.
* thread.cc (pthread::create): Fetch default stacksize calling
get_rlimit_stack.
(pthread_attr::pthread_attr): Fetch default guardsize calling
wincap.def_guard_page_size.
(pthread_attr_getstacksize): Fetch default stacksize calling
get_rlimit_stack.
* thread.h (PTHREAD_DEFAULT_STACKSIZE): Remove.
(PTHREAD_DEFAULT_GUARDSIZE): Remove.
(get_rlimit_stack): Declare.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen
parent
e426213a88
commit
a54bc198b1
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@ -1,3 +1,38 @@
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2015-07-05 Corinna Vinschen <corinna@vinschen.de>
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* miscfuncs.cc (struct pthread_wrapper_arg): Add member guardsize.
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(pthread_wrapper): Set thread stack guarantee according to guardsize.
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Tweak assembler code so that $rax/$eax is not required by GCC to
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prepare the wrapper_arg value.
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(CygwinCreateThread): Fix deadzone handling. Drop setting a "POSIX"
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guardpage (aka page w/ PAGE_NOACCESS). Always use Windows guard
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pages instead. On post-XP systems (providing SetThreadStackGuarantee)
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always set up stack Windows like with reserved/commited areas and
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movable guard pages. Only on XP set up stack fully commited if the
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guardpage size is not the default system guardpage size.
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Fill out pthread_wrapper_arg::guardsize. Improve comments.
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* resource.cc: Implement RSTACK_LIMIT Linux-like.
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(DEFAULT_STACKSIZE): New macro.
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(DEFAULT_STACKGUARD): Ditto.
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(rlimit_stack_guard): New muto.
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(rlimit_stack): New global variable holding current RSTACK_LIMIT values.
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(__set_rlimit_stack): Set rlimit_stack under lock.
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(__get_rlimit_stack): Initialize rlimit_stack from executable header
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and return rlimit_stack values under lock.
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(get_rlimit_stack): Filtering function to return useful default
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stacksize from rlimit_stack.rlim_cur value.
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(getrlimit): Call __get_rlimit_stack in RLIMIT_STACK case.
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(setrlimit): Call __set_rlimit_stack in RLIMIT_STACK case.
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* thread.cc (pthread::create): Fetch default stacksize calling
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get_rlimit_stack.
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(pthread_attr::pthread_attr): Fetch default guardsize calling
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wincap.def_guard_page_size.
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(pthread_attr_getstacksize): Fetch default stacksize calling
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get_rlimit_stack.
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* thread.h (PTHREAD_DEFAULT_STACKSIZE): Remove.
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(PTHREAD_DEFAULT_GUARDSIZE): Remove.
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(get_rlimit_stack): Declare.
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2015-07-05 Corinna Vinschen <corinna@vinschen.de>
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* fhandler_process.cc (heap_info::heap_info): Disable fetching heap info
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@ -560,6 +560,7 @@ struct pthread_wrapper_arg
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PBYTE stackaddr;
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PBYTE stackbase;
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PBYTE stacklimit;
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ULONG guardsize;
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};
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DWORD WINAPI
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@ -592,7 +593,14 @@ pthread_wrapper (PVOID arg)
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The below assembler code will release the OS stack after switching to our
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new stack. */
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wrapper_arg.stackaddr = dealloc_addr;
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/* On post-XP systems, set thread stack guarantee matching the guardsize.
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Note that the guardsize is one page bigger than the guarantee. */
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if (wincap.has_set_thread_stack_guarantee ()
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&& wrapper_arg.guardsize > wincap.def_guard_page_size ())
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{
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wrapper_arg.guardsize -= wincap.page_size ();
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SetThreadStackGuarantee (&wrapper_arg.guardsize);
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}
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/* Initialize new _cygtls. */
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_my_tls.init_thread (wrapper_arg.stackbase - CYGTLS_PADSIZE,
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(DWORD (*)(void*, void*)) wrapper_arg.func);
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@ -632,7 +640,7 @@ pthread_wrapper (PVOID arg)
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#endif
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#ifdef __x86_64__
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__asm__ ("\n\
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movq %[WRAPPER_ARG], %%rbx # Load &wrapper_arg into rbx \n\
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leaq %[WRAPPER_ARG], %%rbx # Load &wrapper_arg into rbx \n\
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movq (%%rbx), %%r12 # Load thread func into r12 \n\
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movq 8(%%rbx), %%r13 # Load thread arg into r13 \n\
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movq 16(%%rbx), %%rcx # Load stackaddr into rcx \n\
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@ -652,11 +660,11 @@ pthread_wrapper (PVOID arg)
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# register r13 and then just call the function. \n\
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movq %%r13, %%rcx # Move thread arg to 1st arg reg\n\
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call *%%r12 # Call thread func \n"
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: : [WRAPPER_ARG] "r" (&wrapper_arg),
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: : [WRAPPER_ARG] "o" (wrapper_arg),
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[CYGTLS] "i" (CYGTLS_PADSIZE));
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#else
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__asm__ ("\n\
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movl %[WRAPPER_ARG], %%ebx # Load &wrapper_arg into ebx \n\
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leal %[WRAPPER_ARG], %%ebx # Load &wrapper_arg into ebx \n\
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movl (%%ebx), %%eax # Load thread func into eax \n\
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movl 4(%%ebx), %%ecx # Load thread arg into ecx \n\
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movl 8(%%ebx), %%edx # Load stackaddr into edx \n\
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@ -683,7 +691,7 @@ pthread_wrapper (PVOID arg)
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# stack in the expected spot. \n\
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popl %%eax # Pop thread_func address \n\
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call *%%eax # Call thread func \n"
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: : [WRAPPER_ARG] "r" (&wrapper_arg),
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: : [WRAPPER_ARG] "o" (wrapper_arg),
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[CYGTLS] "i" (CYGTLS_PADSIZE));
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#endif
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/* pthread::thread_init_wrapper calls pthread::exit, which
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@ -777,7 +785,8 @@ CygwinCreateThread (LPTHREAD_START_ROUTINE thread_func, PVOID thread_arg,
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if (stackaddr)
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{
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/* If the application provided the stack, just use it. */
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/* If the application provided the stack, just use it. There won't
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be any stack overflow handling! */
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wrapper_arg->stackaddr = (PBYTE) stackaddr;
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wrapper_arg->stackbase = (PBYTE) stackaddr + stacksize;
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}
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@ -790,10 +799,8 @@ CygwinCreateThread (LPTHREAD_START_ROUTINE thread_func, PVOID thread_arg,
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real_guardsize = roundup2 (guardsize, wincap.page_size ());
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/* Add the guardsize to the stacksize */
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real_stacksize += real_guardsize;
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/* If we use the default Windows guardpage method, we have to take
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the 2 pages dead zone into account. */
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if (real_guardsize == wincap.page_size ())
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real_stacksize += 2 * wincap.page_size ();
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/* Take dead zone page into account, which always stays uncommited. */
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real_stacksize += wincap.page_size ();
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/* Now roundup the result to the next allocation boundary. */
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real_stacksize = roundup2 (real_stacksize,
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wincap.allocation_granularity ());
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@ -811,46 +818,63 @@ CygwinCreateThread (LPTHREAD_START_ROUTINE thread_func, PVOID thread_arg,
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#endif
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if (!real_stackaddr)
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return NULL;
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/* Set up committed region. Two cases: */
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if (real_guardsize != wincap.page_size ())
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/* Set up committed region. We have two cases: */
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if (!wincap.has_set_thread_stack_guarantee ()
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&& real_guardsize != wincap.def_guard_page_size ())
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{
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/* If guardsize is set to something other than the page size, we
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commit the entire stack and, if guardsize is > 0, we set up a
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POSIX guardpage. We don't set up a Windows guardpage. */
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if (!VirtualAlloc (real_stackaddr, real_guardsize, MEM_COMMIT,
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PAGE_NOACCESS))
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/* If guardsize is set to something other than the default guard page
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size, and if we're running on Windows XP 32 bit, we commit the
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entire stack, and, if guardsize is > 0, set up a guard page. */
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real_stacklimit = (PBYTE) real_stackaddr + wincap.page_size ();
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if (real_guardsize
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&& !VirtualAlloc (real_stacklimit, real_guardsize, MEM_COMMIT,
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PAGE_READWRITE | PAGE_GUARD))
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goto err;
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real_stacklimit = (PBYTE) real_stackaddr + real_guardsize;
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if (!VirtualAlloc (real_stacklimit, real_stacksize - real_guardsize,
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real_stacklimit += real_guardsize;
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if (!VirtualAlloc (real_stacklimit, real_stacksize - real_guardsize
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- wincap.page_size (),
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MEM_COMMIT, PAGE_READWRITE))
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goto err;
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}
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else
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{
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/* If guardsize is exactly the page_size, we can assume that the
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application will behave Windows conformant in terms of stack usage.
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We can especially assume that it never allocates more than one
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page at a time (alloca/_chkstk). Therefore, this is the default
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case which allows a Windows compatible stack setup with a
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reserved region, a guard page, and a commited region. We don't
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need to set up a POSIX guardpage since Windows already handles
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stack overflow: Trying to extend the stack into the last three
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pages of the stack results in a SEGV.
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We always commit 64K here, starting with the guardpage. */
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/* Otherwise we set up the stack like the OS does, with a reserved
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region, the guard pages, and a commited region. We commit the
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stack commit size from the executable header, but at least
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PTHREAD_STACK_MIN (64K). */
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static ULONG exe_commitsize;
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if (!exe_commitsize)
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{
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PIMAGE_DOS_HEADER dosheader;
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PIMAGE_NT_HEADERS ntheader;
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dosheader = (PIMAGE_DOS_HEADER) GetModuleHandle (NULL);
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ntheader = (PIMAGE_NT_HEADERS)
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((PBYTE) dosheader + dosheader->e_lfanew);
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exe_commitsize = ntheader->OptionalHeader.SizeOfStackCommit;
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exe_commitsize = roundup2 (exe_commitsize, wincap.page_size ());
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}
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ULONG commitsize = exe_commitsize;
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if (commitsize > real_stacksize - real_guardsize
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- wincap.page_size ())
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commitsize = real_stacksize - real_guardsize - wincap.page_size ();
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else if (commitsize < PTHREAD_STACK_MIN)
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commitsize = PTHREAD_STACK_MIN;
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real_stacklimit = (PBYTE) real_stackaddr + real_stacksize
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- wincap.allocation_granularity ();
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if (!VirtualAlloc (real_stacklimit, wincap.page_size (), MEM_COMMIT,
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PAGE_READWRITE | PAGE_GUARD))
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- commitsize - real_guardsize;
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if (!VirtualAlloc (real_stacklimit, real_guardsize,
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MEM_COMMIT, PAGE_READWRITE | PAGE_GUARD))
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goto err;
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real_stacklimit += wincap.page_size ();
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if (!VirtualAlloc (real_stacklimit, wincap.allocation_granularity ()
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- wincap.page_size (), MEM_COMMIT,
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real_stacklimit += real_guardsize;
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if (!VirtualAlloc (real_stacklimit, commitsize, MEM_COMMIT,
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PAGE_READWRITE))
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goto err;
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}
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wrapper_arg->stackaddr = (PBYTE) real_stackaddr;
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wrapper_arg->stackbase = (PBYTE) real_stackaddr + real_stacksize;
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wrapper_arg->stacklimit = real_stacklimit;
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wrapper_arg->guardsize = real_guardsize;
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}
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/* Use the STACK_SIZE_PARAM_IS_A_RESERVATION parameter so only the
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minimum size for a thread stack is reserved by the OS. Note that we
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@ -1,6 +1,12 @@
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What's new:
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-----------
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- Handle pthread stacksizes as in GLibc: Default to RLIMIT_STACK resource.
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Allow to set RLIMIT_STACK via setrlimit. Default RLIMIT_STACK to value
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from executable header as described on
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https://msdn.microsoft.com/en-us/library/windows/desktop/ms686774.aspx
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Default stacksize to 2 Megs in case RLIMIT_STACK is set to RLIM_INFINITY.
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- First cut of an implementation to allow signal handlers running on an
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alternate signal stack.
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@ -111,6 +111,61 @@ getrusage (int intwho, struct rusage *rusage_in)
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return res;
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}
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/* Default stacksize in case RLIMIT_STACK is RLIM_INFINITY is 2 Megs with
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system-dependent number of guard pages. The pthread stacksize does not
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include the guardpage size, so we have to subtract the default guardpage
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size. Additionally the Windows stack handling disallows to commit the
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last page, so we subtract it, too. */
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#define DEFAULT_STACKSIZE (2 * 1024 * 1024)
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#define DEFAULT_STACKGUARD (wincap.def_guard_page_size() + wincap.page_size ())
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muto NO_COPY rlimit_stack_guard;
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static struct rlimit rlimit_stack = { 0, RLIM_INFINITY };
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static void
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__set_rlimit_stack (const struct rlimit *rlp)
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{
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rlimit_stack_guard.init ("rlimit_stack_guard")->acquire ();
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rlimit_stack = *rlp;
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rlimit_stack_guard.release ();
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}
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static void
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__get_rlimit_stack (struct rlimit *rlp)
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{
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rlimit_stack_guard.init ("rlimit_stack_guard")->acquire ();
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if (!rlimit_stack.rlim_cur)
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{
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/* Fetch the default stacksize from the executable header... */
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PIMAGE_DOS_HEADER dosheader;
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PIMAGE_NT_HEADERS ntheader;
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dosheader = (PIMAGE_DOS_HEADER) GetModuleHandle (NULL);
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ntheader = (PIMAGE_NT_HEADERS) ((PBYTE) dosheader + dosheader->e_lfanew);
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rlimit_stack.rlim_cur = ntheader->OptionalHeader.SizeOfStackReserve;
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/* ...and subtract the guardpages. */
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rlimit_stack.rlim_cur -= DEFAULT_STACKGUARD;
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}
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*rlp = rlimit_stack;
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rlimit_stack_guard.release ();
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}
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size_t
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get_rlimit_stack (void)
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{
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struct rlimit rl;
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__get_rlimit_stack (&rl);
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/* RLIM_INFINITY doesn't make much sense. As in glibc, use an
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"architecture-specific default". */
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if (rl.rlim_cur == RLIM_INFINITY)
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rl.rlim_cur = DEFAULT_STACKSIZE - DEFAULT_STACKGUARD;
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/* Always return at least minimum stacksize. */
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else if (rl.rlim_cur < PTHREAD_STACK_MIN)
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rl.rlim_cur = PTHREAD_STACK_MIN;
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return (size_t) rl.rlim_cur;
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}
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extern "C" int
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getrlimit (int resource, struct rlimit *rlp)
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{
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@ -127,32 +182,7 @@ getrlimit (int resource, struct rlimit *rlp)
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case RLIMIT_AS:
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break;
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case RLIMIT_STACK:
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PTEB teb;
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/* 2015-06-26: Originally rlim_cur returned the size of the still
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available stack area on the current stack, rlim_max the total size
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of the current stack. Two problems:
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- Per POSIX, RLIMIT_STACK returns "the maximum size of the initial
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thread's stack, in bytes. The implementation does not
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automatically grow the stack beyond this limit".
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- With the implementation of sigaltstack, the current stack is not
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necessarily the "initial thread's stack" anymore. Rather, when
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called from a signal handler running on the alternate stack,
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RLIMIT_STACK should return the size of the original stack.
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rlim_cur is now the size of the stack. For system-provided stacks
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it's the size between DeallocationStack and StackBase. For
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application-provided stacks (via pthread_attr_setstack),
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DeallocationStack is NULL, but StackLimit points to the bottom
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of the stack.
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rlim_max is set to RLIM_INFINITY since there's no hard limit
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for stack sizes on Windows. */
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teb = NtCurrentTeb ();
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rlp->rlim_cur = (rlim_t) teb->Tib.StackBase
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- (rlim_t) (teb->DeallocationStack
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?: teb->Tib.StackLimit);
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__get_rlimit_stack (rlp);
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break;
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case RLIMIT_NOFILE:
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rlp->rlim_cur = getdtablesize ();
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@ -206,6 +236,9 @@ setrlimit (int resource, const struct rlimit *rlp)
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if (rlp->rlim_cur != RLIM_INFINITY)
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return setdtablesize (rlp->rlim_cur);
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break;
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case RLIMIT_STACK:
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__set_rlimit_stack (rlp);
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break;
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default:
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set_errno (EINVAL);
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__leave;
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|
|
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|
@ -475,7 +475,7 @@ pthread::create (void *(*func) (void *), pthread_attr *newattr,
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mutex.lock ();
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/* stackaddr holds the uppermost stack address. See the comments in
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pthread_attr_setstack and pthread_attr_setstackaddr for a description. */
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ULONG stacksize = attr.stacksize ?: PTHREAD_DEFAULT_STACKSIZE;
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ULONG stacksize = attr.stacksize ?: get_rlimit_stack ();
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PVOID stackaddr = attr.stackaddr ? ((caddr_t) attr.stackaddr - stacksize)
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: NULL;
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win32_obj_id = CygwinCreateThread (thread_init_wrapper, this, stackaddr,
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@ -1093,7 +1093,7 @@ pthread::resume ()
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pthread_attr::pthread_attr ():verifyable_object (PTHREAD_ATTR_MAGIC),
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joinable (PTHREAD_CREATE_JOINABLE), contentionscope (PTHREAD_SCOPE_PROCESS),
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inheritsched (PTHREAD_INHERIT_SCHED), stackaddr (NULL), stacksize (0),
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guardsize (PTHREAD_DEFAULT_GUARDSIZE)
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guardsize (wincap.def_guard_page_size ())
|
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{
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schedparam.sched_priority = 0;
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}
|
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|
|
@ -2330,7 +2330,7 @@ pthread_attr_getstacksize (const pthread_attr_t *attr, size_t *size)
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/* If the stacksize has not been set by the application, return the
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default stacksize. Note that this is different from what
|
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pthread_attr_getstack returns. */
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*size = (*attr)->stacksize ?: PTHREAD_DEFAULT_STACKSIZE;
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*size = (*attr)->stacksize ?: get_rlimit_stack ();
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return 0;
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}
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|
|
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|
|
@ -16,13 +16,8 @@ details. */
|
|||
#define WRITE_LOCK 1
|
||||
#define READ_LOCK 2
|
||||
|
||||
/* Default is a 1 Megs stack with a 4K guardpage. The pthread stacksize
|
||||
does not include the guardpage size, so we subtract the default guardpage
|
||||
size. Additionally, the Windows stack handling disallows to use the last
|
||||
two pages as guard page (tested on XP and W7). That results in a zone of
|
||||
three pages which have to be subtract to get the actual stack size. */
|
||||
#define PTHREAD_DEFAULT_STACKSIZE (1024 * 1024 - 3 * wincap.page_size ())
|
||||
#define PTHREAD_DEFAULT_GUARDSIZE (wincap.page_size ())
|
||||
/* resource.cc */
|
||||
extern size_t get_rlimit_stack (void);
|
||||
|
||||
#include <pthread.h>
|
||||
#include <limits.h>
|
||||
|
|
|
|||
|
|
@ -8,6 +8,14 @@
|
|||
|
||||
<itemizedlist mark="bullet">
|
||||
|
||||
<listitem><para>
|
||||
Handle pthread stacksizes as in GLibc: Default to RLIMIT_STACK resource.
|
||||
Allow to set RLIMIT_STACK via setrlimit. Default RLIMIT_STACK to value
|
||||
from executable header as described on the MSDN website
|
||||
<ulink url="https://msdn.microsoft.com/en-us/library/windows/desktop/ms686774.aspx">Thread Stack Size</ulink>
|
||||
Default stacksize to 2 Megs in case RLIMIT_STACK is set to RLIM_INFINITY.
|
||||
</para></listitem>
|
||||
|
||||
<listitem><para>
|
||||
First cut of an implementation to allow signal handlers running on an
|
||||
alternate signal stack.
|
||||
|
|
|
|||
Loading…
Reference in a new issue