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Commit 82b7d4fb authored by Stephen Boyd's avatar Stephen Boyd Committed by Greg Kroah-Hartman
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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: default avatarStephen Boyd <sboyd@codeaurora.org>
Reviewed-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b97f6799

fs/debugfs/file.c

+4 −1
Original line number Original line Diff line number Diff line
@@ -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_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, 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

 * 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 *debugfs_create_x64(const char *name, umode_t mode,

				 struct dentry *parent, u64 *value)

				 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);

EXPORT_SYMBOL_GPL(debugfs_create_x64);