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| author | Richard Henderson <richard.henderson@linaro.org> | 2019-05-19 13:19:52 -0700 |
|---|---|---|
| committer | Laurent Vivier <laurent@vivier.eu> | 2019-05-24 13:16:21 +0200 |
| commit | 30ab9ef2967dde22193f609b6ec56101c156b061 (patch) | |
| tree | 128863abc52b116065b5d5c162e0335592e60254 /linux-user/syscall.c | |
| parent | abcac736c1505254ec3f9587aff04fbe4705a55e (diff) | |
| download | qemu-30ab9ef2967dde22193f609b6ec56101c156b061.zip qemu-30ab9ef2967dde22193f609b6ec56101c156b061.tar.gz qemu-30ab9ef2967dde22193f609b6ec56101c156b061.tar.bz2 | |
linux-user: Fix shmat emulation by honoring host SHMLBA
For those hosts with SHMLBA > getpagesize, we don't automatically
select a guest address that is compatible with the host. We can
achieve this by boosting the alignment of guest_base and by adding
an extra alignment argument to mmap_find_vma.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20190519201953.20161-13-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Diffstat (limited to 'linux-user/syscall.c')
| -rw-r--r-- | linux-user/syscall.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/linux-user/syscall.c b/linux-user/syscall.c index e5545cb..51cc049 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -3912,7 +3912,8 @@ static inline abi_ulong do_shmat(CPUArchState *cpu_env, else { abi_ulong mmap_start; - mmap_start = mmap_find_vma(0, shm_info.shm_segsz); + /* In order to use the host shmat, we need to honor host SHMLBA. */ + mmap_start = mmap_find_vma(0, shm_info.shm_segsz, MAX(SHMLBA, shmlba)); if (mmap_start == -1) { errno = ENOMEM; |