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-rw-r--r--kernel/sys.c20
1 files changed, 10 insertions, 10 deletions
diff --git a/kernel/sys.c b/kernel/sys.c
index 6af9212ab5aa..78947de6f969 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1853,11 +1853,13 @@ static int prctl_set_mm_map(int opt, const void __user *addr, unsigned long data
user_auxv[AT_VECTOR_SIZE - 1] = AT_NULL;
}
- if (prctl_map.exe_fd != (u32)-1)
+ if (prctl_map.exe_fd != (u32)-1) {
error = prctl_set_mm_exe_file(mm, prctl_map.exe_fd);
- down_read(&mm->mmap_sem);
- if (error)
- goto out;
+ if (error)
+ return error;
+ }
+
+ down_write(&mm->mmap_sem);
/*
* We don't validate if these members are pointing to
@@ -1894,10 +1896,8 @@ static int prctl_set_mm_map(int opt, const void __user *addr, unsigned long data
if (prctl_map.auxv_size)
memcpy(mm->saved_auxv, user_auxv, sizeof(user_auxv));
- error = 0;
-out:
- up_read(&mm->mmap_sem);
- return error;
+ up_write(&mm->mmap_sem);
+ return 0;
}
#endif /* CONFIG_CHECKPOINT_RESTORE */
@@ -1963,7 +1963,7 @@ static int prctl_set_mm(int opt, unsigned long addr,
error = -EINVAL;
- down_read(&mm->mmap_sem);
+ down_write(&mm->mmap_sem);
vma = find_vma(mm, addr);
prctl_map.start_code = mm->start_code;
@@ -2056,7 +2056,7 @@ static int prctl_set_mm(int opt, unsigned long addr,
error = 0;
out:
- up_read(&mm->mmap_sem);
+ up_write(&mm->mmap_sem);
return error;
}