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Peter Maydell a7ec0f98e3 linux-user: Don't allow guest to block SIGSEGV 
Don't allow the linux-user guest to block SIGSEGV -- QEMU needs this
signal to detect accesses to pages which it has marked read-only
because it has cached translated code from them.

We implement this by making the do_sigprocmask() wrapper suppress
SIGSEGV when doing the host process signal mask manipulation; instead
we store the current state of SIGSEGV in the TaskState struct.

If we get a SIGSEGV for the guest when the guest has blocked the
signal, we treat it as if the default SEGV handler was in place,
as the kernel does for forced SIGSEGV delivery.

This patch is based on an idea by Alex Barcelo, but rather than
simply lying to the guest about the SIGSEGV state we track it.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reported-by: Alex Barcelo <abarcelo@ac.upc.edu>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
2014-03-17 11:44:32 +02:00
audio Add the ability to vary Spice playback and record rates, to facilitate Opus support. 2014-02-03 11:05:15 +01:00
backends ui/sdl2 : initial port to SDL 2.0 (v2.0) 2014-03-05 09:52:05 +01:00
block nbd: close socket if connection breaks 2014-03-14 16:28:28 +01:00
bsd-user cpu: Move opaque field from CPU_COMMON to CPUState 2014-03-13 19:20:47 +01:00
default-configs Add Enhanced Three-Speed Ethernet Controller (eTSEC) 2014-03-05 03:06:45 +01:00
disas libvixl: Fix format strings for several int64_t values 2014-03-10 14:56:29 +00:00
docs Docs: Introduce multiport serial support in qemupciserial.inf. 2014-03-12 15:03:42 +00:00
dtc@bc895d6d09 dtc: add submodule 2013-04-18 13:50:53 +02:00
fpu softfloat: Support halving the result of muladd operation 2014-02-20 10:35:50 +00:00
fsdev hw/9pfs: Include virtio-9p-device.o in build 2014-03-04 09:20:49 +05:30
gdb-xml target-arm: Support fp registers in gdb stub 2013-12-17 19:42:32 +00:00
hw FSL eTSEC: Fix typo in rx ring 2014-03-15 13:54:18 +04:00
include scsi: Fix migration of scsi sense data 2014-03-14 10:06:55 +01:00
libcacard Add a 'name' parameter to qemu_thread_create 2014-03-09 21:09:38 +02:00
linux-headers update linux headers to kvm/next 2014-02-27 09:50:45 +01:00
linux-user linux-user: Don't allow guest to block SIGSEGV 2014-03-17 11:44:32 +02:00
net Net patches 2014-03-12 16:45:25 +00:00
pc-bios prep: Update ppc_rom.bin 2014-03-13 20:15:37 +01:00
pixman@97336fad32 qapi: move include files to include/qobject/ 2012-12-19 08:31:31 +01:00
po po: Update all *.po files 2013-08-07 12:48:00 -05:00
qapi qapi: Add missing null check to opts_start_struct() 2014-03-03 11:17:45 -05:00
qga qga: Remove unneeded include file 2014-03-03 09:46:27 +04:00
qobject qdict: Extract non-QDicts in qdict_array_split() 2014-02-21 22:11:23 +01:00
qom cpu: Move tb_jmp_cache field from CPU_COMMON to CPUState 2014-03-13 19:20:46 +01:00
roms prep: Update ppc_rom.bin 2014-03-13 20:15:37 +01:00
scripts scripts/make-release: Don't distribute .git directories 2014-03-15 13:54:18 +04:00
slirp misc: Spelling and grammar fixes in comments 2013-10-26 13:06:45 +04:00
stubs blockdev: Refuse to open encrypted image unless paused 2014-03-14 16:24:42 +01:00
sysconfigs/target Eliminate cpus-x86_64.conf file 2012-09-21 15:12:58 +02:00
target-alpha cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
target-arm misc: Fix typos in comments 2014-03-15 13:54:18 +04:00
target-cris cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
target-i386 cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
target-lm32 cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
target-m68k cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
target-microblaze cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
target-mips cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
target-moxie cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
target-openrisc cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
target-ppc misc: Fix typos in comments 2014-03-15 13:54:18 +04:00
target-s390x cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
target-sh4 cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
target-sparc cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
target-unicore32 cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
target-xtensa cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
tcg tcg-aarch64: Introduce tcg_out_insn_3405 2014-03-14 11:00:15 -07:00
tests trivial patches for 2014-03-15 2014-03-15 18:22:11 +00:00
trace trace: Fix build warnings for Win32 build 2014-03-12 14:19:58 +01:00
ui gtk: Add mouse wheel support 2014-03-12 10:44:45 +01:00
util Block pull request 2014-03-13 15:33:04 +00:00
.exrc qemu: add .exrc 2012-09-07 09:02:44 +03:00
.gitignore Add qga/qapi-generated to .gitignore 2014-03-15 13:54:18 +04:00
.gitmodules Add OpenHack'Ware submodule 2014-03-12 17:26:32 +01:00
.mailmap Update mailmap 2013-09-05 09:40:31 -05:00
.travis.yml .travis.yml: add IRC notifications for build failures 2014-03-15 13:54:18 +04:00
aio-posix.c aio: make aio_poll(ctx, true) block with no fds 2013-12-06 16:53:51 +01:00
aio-win32.c aio: make aio_poll(ctx, true) block with no fds 2013-12-06 16:53:51 +01:00
arch_init.c XBZRLE: Fix qemu crash when resize the xbzrle cache 2014-03-08 22:22:34 +01:00
async.c aio: add aio_context_acquire() and aio_context_release() 2014-03-13 14:42:24 +01:00
balloon.c softmmu: move include files to include/sysemu/ 2012-12-19 08:32:45 +01:00
block-migration.c block: per caller dirty bitmap 2013-11-29 13:40:33 +01:00
block.c blockdev: Refuse to open encrypted image unless paused 2014-03-14 16:24:42 +01:00
blockdev-nbd.c nbd: use BlockDriverState refcnt 2013-09-06 15:25:08 +02:00
blockdev.c blockdev: Fix NULL pointer dereference in blockdev-add 2014-03-06 17:27:28 +01:00
blockjob.c Use error_is_set() only when necessary 2014-02-17 11:57:23 -05:00
bt-host.c sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
bt-vhci.c sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
Changelog Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
CODING_STYLE Replace Qemu by QEMU in internal documentation 2012-04-07 13:58:25 +00:00
configure configure: Don't use __int128_t for clang versions before 3.2 2014-03-15 13:54:18 +04:00
COPYING
COPYING.LIB Update FSF address in GPL/LGPL boilerplate 2009-01-04 22:05:52 +00:00
coroutine-gthread.c block: move include files to include/block/ 2012-12-19 08:31:31 +01:00
coroutine-sigaltstack.c Merge remote-tracking branch 'kwolf/for-anthony' into staging 2013-02-26 07:44:39 -06:00
coroutine-ucontext.c Fix warnings suppressors to honor --disable-werror 2013-04-17 10:28:04 -05:00
coroutine-win32.c block: move include files to include/block/ 2012-12-19 08:31:31 +01:00
cpu-exec.c cpu-exec: Change cpu_resume_from_signal() argument to CPUState 2014-03-13 19:20:48 +01:00
cpus.c cpu: Move icount_decr field from CPU_COMMON to CPUState 2014-03-13 19:20:46 +01:00
cputlb.c cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
device_tree.c device_tree: qemu_fdt_setprop: Rename val_array arg 2013-12-20 01:58:12 +01:00
device-hotplug.c hw/boards: Convert current_machine to MachineState 2014-03-12 20:13:02 +01:00
disas.c disas: Implement disassembly output for A64 2014-02-08 14:50:48 +00:00
dma-helpers.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
dump.c dump: add 'query-dump-guest-memory-capability' command 2014-02-28 11:52:03 -05:00
exec.c cputlb: Change tlb_flush() argument to CPUState 2014-03-13 19:52:47 +01:00
gdbstub.c exec: Change cpu_breakpoint_{insert,remove{,_by_ref,_all}} argument 2014-03-13 19:20:48 +01:00
HACKING HACKING: Document vaddr type usage 2013-07-23 02:41:31 +02:00
hmp-commands.hx block: update block commit documentation regarding image truncation 2014-01-24 16:12:49 +01:00
hmp.c dump: make kdump-compressed format available for 'dump-guest-memory' 2014-02-28 11:52:03 -05:00
hmp.h monitor: add object-add (QMP) and object_add (HMP) command 2014-01-06 13:45:47 -05:00
iohandler.c iohandler: switch to GPollFD 2013-02-21 16:17:31 -06:00
ioport.c portio: Allow to mark portio lists as coalesced MMIO flushing 2013-10-17 17:24:15 +02:00
iothread.c qmp: add query-iothreads command 2014-03-13 14:42:24 +01:00
kvm-all.c Merge remote-tracking branch 'remotes/kvm/uq/master' into staging 2014-03-11 19:39:17 +00:00
kvm-stub.c Revert "KVM: Split QEMUMachine typedef into separate header" 2014-03-13 03:49:48 +01:00
LICENSE LICENSE: clarify 2013-08-12 09:15:12 -05:00
main-loop.c main-loop: Suppress "I/O thread spun" warnings for qtest 2014-03-13 21:36:50 +01:00
MAINTAINERS acpi,pc,pci,virtio,memory bug fixes 2014-03-10 19:14:11 +00:00
Makefile build: Fix installation of target-dependent files 2014-03-08 12:08:11 +00:00
Makefile.objs iothread: add I/O thread object 2014-03-13 14:42:24 +01:00
Makefile.target build: softmmu targets do not have a "main.o" file 2014-02-20 13:14:18 +01:00
memory_mapping.c cpu: Use QTAILQ for CPU list 2013-09-03 12:25:55 +02:00
memory.c memory_region_present: return false if address is not found in child MemoryRegion 2014-03-09 21:09:37 +02:00
migration-exec.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
migration-fd.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
migration-rdma.c rdma: rename 'x-rdma' => 'rdma' 2014-02-25 14:30:28 +01:00
migration-tcp.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
migration-unix.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
migration.c Add a 'name' parameter to qemu_thread_create 2014-03-09 21:09:38 +02:00
module-common.c module: implement module loading 2014-02-20 13:14:18 +01:00
monitor.c input: mouse: switch monitor to new core 2014-03-05 09:52:03 +01:00
nbd.c nbd: move socket wrappers to qemu-nbd 2014-02-21 21:02:23 +01:00
os-posix.c oslib-posix: Fix build on FreeBSD 2014-03-13 14:34:16 +00:00
os-win32.c util: Split out exec_dir from os_find_datadir 2014-02-20 13:12:54 +01:00
page_cache.c Fix two XBZRLE corruption issues 2014-02-25 14:30:28 +01:00
qapi-schema.json qmp: add query-iothreads command 2014-03-13 14:42:24 +01:00
qdev-monitor.c qdev-monitor: Set properties after parent is assigned in device_add 2014-03-12 20:13:02 +01:00
qdict-test-data.txt Introduce QDict test data file 2009-09-04 09:37:34 -05:00
qemu-bridge-helper.c qemu-bridge-helper: force usage of a very high MAC address for the bridge 2013-03-28 12:58:52 -05:00
qemu-char.c char: restore read callback on a reattached (hotplug) chardev 2014-03-13 10:33:45 +01:00
qemu-coroutine-io.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
qemu-coroutine-lock.c coroutine: remove qemu_co_queue_wait_insert_head 2013-12-02 17:11:49 +01:00
qemu-coroutine-sleep.c coroutine: add co_aio_sleep_ns() to allow sleep in block drivers 2013-10-30 12:22:09 +01:00
qemu-coroutine.c coroutine: add ./configure --disable-coroutine-pool 2013-09-12 10:12:48 +02:00
qemu-doc.texi Describe flaws in qcow/qcow2 encryption in the docs 2014-01-31 22:05:03 +01:00
qemu-file.c qemu_file: Fix mismerge of "use fwrite() correctly" 2014-03-08 22:22:34 +01:00
qemu-img-cmds.hx qemu-img: add -l for snapshot in convert 2013-12-04 15:19:00 +01:00
qemu-img.c qemu-img convert: Fix progress output 2014-03-05 15:58:32 +01:00
qemu-img.texi Describe flaws in qcow/qcow2 encryption in the docs 2014-01-31 22:05:03 +01:00
qemu-io-cmds.c qemu-io: Fix warnings from static code analysis 2014-03-13 14:42:24 +01:00
qemu-io.c qemu-io: Fix warnings from static code analysis 2014-03-13 14:42:24 +01:00
qemu-log.c qemu-log: default to stderr for logging output 2013-02-26 13:31:47 -06:00
qemu-nbd.c Block patches 2014-02-25 10:50:11 +00:00
qemu-nbd.texi qemu-nbd: add doc for option -f 2013-12-04 15:19:00 +01:00
qemu-options-wrapper.h vl.c: In qemu -h output, only print options for the arch we are running as 2011-12-19 10:27:33 -06:00
qemu-options.h vl.c: Move option generation logic into a wrapper file 2011-12-19 10:27:33 -06:00
qemu-options.hx Add 'debug-threads' suboption to --name 2014-03-09 21:09:37 +02:00
qemu-seccomp.c seccomp: add some basic shared memory syscalls to the whitelist 2014-01-20 11:19:34 -02:00
qemu-tech.texi qemu-tech.texi: update implemented xtensa features list 2012-11-29 13:00:52 -06:00
qemu-timer.c timer: add timer_mod_anticipate and timer_mod_anticipate_ns 2013-10-17 17:31:00 +02:00
qemu.nsi nsis: Improved support for parallel installation of 32 and 64 bit code 2013-11-07 07:02:44 +01:00
qemu.sasl sasl: Avoid 'Could not find keytab file' in syslog 2014-03-15 13:54:18 +04:00
qmp-commands.hx qmp: add query-iothreads command 2014-03-13 14:42:24 +01:00
qmp.c hw/boards: Convert current_machine to MachineState 2014-03-12 20:13:02 +01:00
qtest.c kvm: Add a new machine option kvm-type 2014-03-05 03:06:24 +01:00
README Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
rules.mak module: implement module loading 2014-02-20 13:14:18 +01:00
savevm.c migration: extend section_start/end traces 2014-03-08 22:22:34 +01:00
spice-qemu-char.c spice: hook qemu_chr_fe_set_open() event to ports 2014-02-03 11:05:15 +01:00
tcg-runtime.c tcg: Implement multiword multiply helpers 2013-02-23 17:25:28 +00:00
tci.c misc: Use new rotate functions 2013-09-25 21:23:05 +02:00
thread-pool.c Add a 'name' parameter to qemu_thread_create 2014-03-09 21:09:38 +02:00
thunk.c exec: move include files to include/exec/ 2012-12-19 08:31:31 +01:00
tpm.c Use error_is_set() only when necessary 2014-02-17 11:57:23 -05:00
trace-events migration: extend section_start/end traces 2014-03-08 22:22:34 +01:00
translate-all.c exec: Change cpu_abort() argument to CPUState 2014-03-13 19:52:28 +01:00
translate-all.h translate-all: Change tb_check_watchpoint() argument to CPUState 2014-03-13 19:20:48 +01:00
user-exec.c user-exec: Change exception_action() argument to CPUState 2014-03-13 19:52:48 +01:00
VERSION Update version for v2.0-rc0 2014-03-13 20:08:15 -07:00
version.rc Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
vl.c spapr: Fix return value of vga initialization 2014-03-13 20:53:28 +01:00
vmstate.c Fix vmstate_info_int32_le comparison/assign 2014-02-25 14:30:28 +01:00
xbzrle.c Move XBZRLE encoding code to a separate file to allow testing 2013-02-01 08:32:20 +01:00
xen-all.c kvm: Add a new machine option kvm-type 2014-03-05 03:06:24 +01:00
xen-mapcache.c hw: move headers to include/ 2013-04-08 18:13:10 +02:00
xen-stub.c kvm: Add a new machine option kvm-type 2014-03-05 03:06:24 +01:00

README 

Read the documentation in qemu-doc.html or on http://wiki.qemu-project.org

- QEMU team