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authorStephen Boyd <sboyd@codeaurora.org>2015-10-13 04:09:10 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-10-18 08:09:03 +0300
commit82b7d4fb4e0bcb8fe0d49edea21f595664f83c2f (patch)
treecebd4d096eac9f6227049cde0ef2444cebe09409 /fs/debugfs
parentb97f679954b7771183f3c0a6a47b17e185e64a8a (diff)
downloadlinux-82b7d4fb4e0bcb8fe0d49edea21f595664f83c2f.tar.xz
debugfs: Add read-only/write-only x64 file ops
There aren't any read-only or write-only x64 file ops, but there is a caller of debugfs_create_x64() that calls it with mode equal to S_IRUGO. This leads to the possibility of userspace modifying the file, so let's use the newly created debugfs_create_mode() helper here to fix this. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/debugfs')
-rw-r--r--fs/debugfs/file.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index 5d594efa7c93..f69d42efe4b8 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -256,6 +256,8 @@ DEFINE_SIMPLE_ATTRIBUTE(fops_x32_ro, debugfs_u32_get, NULL, "0x%08llx\n");
DEFINE_SIMPLE_ATTRIBUTE(fops_x32_wo, NULL, debugfs_u32_set, "0x%08llx\n");
DEFINE_SIMPLE_ATTRIBUTE(fops_x64, debugfs_u64_get, debugfs_u64_set, "0x%016llx\n");
+DEFINE_SIMPLE_ATTRIBUTE(fops_x64_ro, debugfs_u64_get, NULL, "0x%016llx\n");
+DEFINE_SIMPLE_ATTRIBUTE(fops_x64_wo, NULL, debugfs_u64_set, "0x%016llx\n");
/*
* debugfs_create_x{8,16,32,64} - create a debugfs file that is used to read and write an unsigned {8,16,32,64}-bit value
@@ -332,7 +334,8 @@ EXPORT_SYMBOL_GPL(debugfs_create_x32);
struct dentry *debugfs_create_x64(const char *name, umode_t mode,
struct dentry *parent, u64 *value)
{
- return debugfs_create_file(name, mode, parent, value, &fops_x64);
+ return debugfs_create_mode(name, mode, parent, value, &fops_x64,
+ &fops_x64_ro, &fops_x64_wo);
}
EXPORT_SYMBOL_GPL(debugfs_create_x64);