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hurd: fix clearing SS_ONSTACK when longjmp-ing from sighandler
* sysdeps/i386/htl/Makefile: New file. * sysdeps/i386/htl/tcb-offsets.sym: New file. * sysdeps/mach/hurd/i386/Makefile [setjmp] (gen-as-const-headers): Add signal-defines.sym. * sysdeps/mach/hurd/i386/____longjmp_chk.S: Include tcb-offsets.h. (____longjmp_chk): Harmonize with i386's __longjmp. Clear SS_ONSTACK when jumping off the alternate stack. * sysdeps/mach/hurd/i386/__longjmp.S: New file.
This commit is contained in:
Samuel Thibault
parent
8fcc772da8
commit
02937d825a
20
sysdeps/i386/htl/Makefile
Normal file
20
sysdeps/i386/htl/Makefile
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@ -0,0 +1,20 @@
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# Copyright (C) 2020 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <https://www.gnu.org/licenses/>.
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ifeq ($(subdir),csu)
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gen-as-const-headers += tcb-offsets.sym
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endif
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8
sysdeps/i386/htl/tcb-offsets.sym
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8
sysdeps/i386/htl/tcb-offsets.sym
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#include <sysdep.h>
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#include <tls.h>
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#include <kernel-features.h>
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MULTIPLE_THREADS_OFFSET offsetof (tcbhead_t, multiple_threads)
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SYSINFO_OFFSET offsetof (tcbhead_t, sysinfo)
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POINTER_GUARD offsetof (tcbhead_t, pointer_guard)
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SIGSTATE_OFFSET offsetof (tcbhead_t, _hurd_sigstate)
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@ -7,6 +7,10 @@ ifeq ($(subdir),debug)
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gen-as-const-headers += signal-defines.sym
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endif
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ifeq ($(subdir),setjmp)
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gen-as-const-headers += signal-defines.sym
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endif
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ifeq ($(subdir),csu)
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ifeq (yes,$(build-shared))
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sysdep_routines += divdi3
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@ -17,6 +17,7 @@
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#include <sysdep.h>
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#include <jmpbuf-offsets.h>
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#include <tcb-offsets.h>
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#include <asm-syntax.h>
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#include <signal-defines.h>
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@ -47,65 +48,70 @@ longjmp_msg:
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.text
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ENTRY (____longjmp_chk)
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movl 4(%esp), %ecx /* User's jmp_buf in %ecx. */
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movl 4(%esp), %eax /* User's jmp_buf in %eax. */
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/* Save the return address now. */
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movl (JB_PC*4)(%ecx), %edx
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movl (JB_PC*4)(%eax), %edx
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/* Get the stack pointer. */
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movl (JB_SP*4)(%ecx), %edi
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cfi_undefined(%edi)
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movl (JB_SP*4)(%eax), %ecx
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cfi_undefined(%ecx)
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#ifdef PTR_DEMANGLE
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PTR_DEMANGLE (%edx)
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PTR_DEMANGLE (%edi)
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PTR_DEMANGLE (%ecx)
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#endif
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cmpl %edi, %esp
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movl %gs:SIGSTATE_OFFSET,%edi
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testl $SS_ONSTACK, (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_FLAGS__OFFSET)(%edi)
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jnz .Lonstack
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/* We were on the main stack */
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cmpl %ecx, %esp
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/* Jumping to a higher-address frame is always allowed. */
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jbe .Lok
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/* Passing here, we're either about to do something invalid, or we're
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executing on an alternative signal stack. */
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/* Otherwise it's not allowed. */
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CALL_FAIL
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/* TODO: need locking? */
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/* struct hurd_sigstate * _hurd_self_sigstate (void) */
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call HIDDEN_JUMPTARGET(_hurd_self_sigstate)
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/* TODO: %eax and %eax->sigaltstack are always valid? */
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.Lonstack:
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/* We were on the alternate stack, can't really easily check anything
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since longjmp may get us out of the alternate stack. */
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testl $SS_ONSTACK, (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_FLAGS__OFFSET)(%eax)
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/* Fail if SS_ONSTACK is not set. */
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jz .Lfail
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cmpl (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_SP__OFFSET)(%edi), %ecx
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jb .Loks /* We jump below the alternate stack, switch. */
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movl (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_SP__OFFSET)(%eax), %ebx
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addl (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_SIZE__OFFSET)(%eax), %ebx
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subl %edi, %ebx
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cmpl (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_SIZE__OFFSET)(%eax), %ebx
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/* TODO: comment this calculation. */
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jae .Lok
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movl (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_SP__OFFSET)(%edi), %ebx
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addl (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_SIZE__OFFSET)(%edi), %ebx
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cmpl %ebx, %ecx
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jb .Lok /* We jump inside the alternate stack, do not switch. */
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.Lfail: CALL_FAIL
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/* We jump above the alternate stack, switch. */
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.Loks: /* We jump out of the alternate stack, clear SS_ONSTACK flag. */
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andl $~(SS_ONSTACK), (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_FLAGS__OFFSET)(%edi)
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.Lok: /* We add unwind information for the target here. */
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cfi_def_cfa(%ecx, 0)
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cfi_def_cfa(%eax, 0)
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cfi_register(%eip, %edx)
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cfi_register(%esp, %edi)
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cfi_register(%esp, %ecx)
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cfi_offset(%ebx, JB_BX*4)
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cfi_offset(%esi, JB_SI*4)
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cfi_offset(%edi, JB_DI*4)
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cfi_offset(%ebp, JB_BP*4)
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movl 8(%esp), %eax /* Second argument is return value. */
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movl %edi, %esp
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/* Restore registers. */
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movl (JB_BX*4)(%ecx), %ebx
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movl (JB_SI*4)(%ecx), %esi
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movl (JB_DI*4)(%ecx), %edi
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movl (JB_BP*4)(%ecx), %ebp
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movl (JB_BX*4)(%eax), %ebx
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movl (JB_SI*4)(%eax), %esi
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movl (JB_DI*4)(%eax), %edi
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movl (JB_BP*4)(%eax), %ebp
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cfi_restore(%ebx)
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cfi_restore(%esi)
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cfi_restore(%edi)
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cfi_restore(%ebp)
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movl 8(%esp), %eax /* Second argument is return value. */
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movl %ecx, %esp
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/* Jump to saved PC. */
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jmp *%edx
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END (____longjmp_chk)
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84
sysdeps/mach/hurd/i386/__longjmp.S
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84
sysdeps/mach/hurd/i386/__longjmp.S
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@ -0,0 +1,84 @@
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/* Copyright (C) 2001-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <jmpbuf-offsets.h>
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#include <tcb-offsets.h>
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#include <asm-syntax.h>
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#include <signal-defines.h>
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/* #include <signal.h> */
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#define SS_ONSTACK 1
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.text
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ENTRY (__longjmp)
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movl 4(%esp), %eax /* User's jmp_buf in %eax. */
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/* Save the return address now. */
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movl (JB_PC*4)(%eax), %edx
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/* Get the stack pointer. */
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movl (JB_SP*4)(%eax), %ecx
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cfi_undefined(%ecx)
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#ifdef PTR_DEMANGLE
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PTR_DEMANGLE (%edx)
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PTR_DEMANGLE (%ecx)
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#endif
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movl %gs:SIGSTATE_OFFSET,%edi
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testl $SS_ONSTACK, (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_FLAGS__OFFSET)(%edi)
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jz .Lok
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/* We were on the alternate stack. */
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cmpl (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_SP__OFFSET)(%edi), %ecx
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jb .Loks /* We jump below the alternate stack, switch. */
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movl (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_SP__OFFSET)(%edi), %ebx
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addl (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_SIZE__OFFSET)(%edi), %ebx
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cmpl %ebx, %ecx
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jb .Lok /* We jump inside the alternate stack, do not switch. */
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/* We jump above the alternate stack, switch. */
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.Loks: /* We jump out of the alternate stack, clear SS_ONSTACK flag. */
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andl $~(SS_ONSTACK), (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_FLAGS__OFFSET)(%edi)
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.Lok: /* We add unwind information for the target here. */
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cfi_def_cfa(%eax, 0)
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cfi_register(%eip, %edx)
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cfi_register(%esp, %ecx)
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cfi_offset(%ebx, JB_BX*4)
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cfi_offset(%esi, JB_SI*4)
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cfi_offset(%edi, JB_DI*4)
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cfi_offset(%ebp, JB_BP*4)
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/* Restore registers. */
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movl (JB_BX*4)(%eax), %ebx
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movl (JB_SI*4)(%eax), %esi
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movl (JB_DI*4)(%eax), %edi
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movl (JB_BP*4)(%eax), %ebp
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cfi_restore(%ebx)
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cfi_restore(%esi)
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cfi_restore(%edi)
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cfi_restore(%ebp)
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movl 8(%esp), %eax /* Second argument is return value. */
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movl %ecx, %esp
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/* Jump to saved PC. */
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jmp *%edx
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END (__longjmp)
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