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| author | Brad Smith | 2018-10-19 14:52:39 +0200 |
|---|---|---|
| committer | Peter Maydell | 2018-11-06 11:52:23 +0100 |
| commit | fc3d1bad1edf08871275cf469a64e12dae4eba96 (patch) | |
| tree | 03bd93a3699835cb4d0e4938dbe05313d8db2b84 /iothread.c | |
| parent | Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20181105' into staging (diff) | |
| download | qemu-fc3d1bad1edf08871275cf469a64e12dae4eba96.tar.gz qemu-fc3d1bad1edf08871275cf469a64e12dae4eba96.tar.xz qemu-fc3d1bad1edf08871275cf469a64e12dae4eba96.zip | |
oslib-posix: Use MAP_STACK in qemu_alloc_stack() on OpenBSD
Use MAP_STACK in qemu_alloc_stack() on OpenBSD.
Added to our 6.4 release.
MAP_STACK Indicate that the mapping is used as a stack. This
flag must be used in combination with MAP_ANON and
MAP_PRIVATE.
Implement MAP_STACK option for mmap(). Synchronous faults (pagefault and
syscall) confirm the stack register points at MAP_STACK memory, otherwise
SIGSEGV is delivered. sigaltstack() and pthread_attr_setstack() are modified
to create a MAP_STACK sub-region which satisfies alignment requirements.
Observe that MAP_STACK can only be set/cleared by mmap(), which zeroes the
contents of the region -- there is no mprotect() equivalent operation, so
there is no MAP_STACK-adding gadget.
Signed-off-by: Brad Smith <brad@comstyle.com>
Reviewed-by: Kamil Rytarowski <n54@gmx.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20181019125239.GA13884@humpty.home.comstyle.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'iothread.c')
0 files changed, 0 insertions, 0 deletions