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| author | Chen Gang <chengang@emindsoft.com.cn> | 2015-12-30 09:10:54 +0800 |
|---|---|---|
| committer | Riku Voipio <riku.voipio@linaro.org> | 2016-01-08 15:26:16 +0200 |
| commit | e6deac9cf99e013a3e253aff2332836c86d8a52c (patch) | |
| tree | bc9c3aaab010889853d283ab9862c46e767a55fa /linux-user | |
| parent | 2a0fa68fb9761e2eb3dae4034131948d33018dc9 (diff) | |
| download | qemu-e6deac9cf99e013a3e253aff2332836c86d8a52c.tar.gz | |
linux-user/mmap.c: Always zero MAP_ANONYMOUS memory in mmap_frag()
When mapping MAP_ANONYMOUS memory fragments, still need notice about to
set it zero, or it will cause issues.
Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Diffstat (limited to 'linux-user')
| -rw-r--r-- | linux-user/mmap.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/linux-user/mmap.c b/linux-user/mmap.c index 7b459d5100..c6c478e552 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -186,10 +186,12 @@ static int mmap_frag(abi_ulong real_start, if (prot_new != (prot1 | PROT_WRITE)) mprotect(host_start, qemu_host_page_size, prot_new); } else { - /* just update the protection */ if (prot_new != prot1) { mprotect(host_start, qemu_host_page_size, prot_new); } + if (prot_new & PROT_WRITE) { + memset(g2h(start), 0, end - start); + } } return 0; } |