Merge branch 'for-5.2-vsprintf-hardening' into for-linus (35e15475) · Commits · e / devices / android_kernel_fairphone_FP5

Documentation/core-api/printk-formats.rst

+8 −0

Original line number	Diff line number	Diff line
		@@ -58,6 +58,14 @@ A raw pointer value may be printed with %p which will hash the address
		before printing. The kernel also supports extended specifiers for printing
		pointers of different types.

		Some of the extended specifiers print the data on the given address instead
		of printing the address itself. In this case, the following error messages
		might be printed instead of the unreachable information::

		(null) data on plain NULL address
		(efault) data on invalid address
		(einval) invalid data on a valid address

		Plain Pointers
		--------------

+22 −3

Original line number	Diff line number	Diff line
		@@ -239,6 +239,7 @@ plain_format(void)
		#define PTR ((void *)0x456789ab)
		#define PTR_STR "456789ab"
		#define PTR_VAL_NO_CRNG "(ptrval)"
		#define ZEROS ""

		static int __init
		plain_format(void)
		@@ -268,7 +269,6 @@ plain_hash_to_buffer(const void p, char buf, size_t len)
		return 0;
		}


		static int __init
		plain_hash(void)
		{
		@@ -325,6 +325,24 @@ test_hashed(const char fmt, const void p)
		test(buf, fmt, p);
		}

		static void __init
		null_pointer(void)
		{
		test_hashed("%p", NULL);
		test(ZEROS "00000000", "%px", NULL);
		test("(null)", "%pE", NULL);
		}

		#define PTR_INVALID ((void *)0x000000ab)

		static void __init
		invalid_pointer(void)
		{
		test_hashed("%p", PTR_INVALID);
		test(ZEROS "000000ab", "%px", PTR_INVALID);
		test("(efault)", "%pE", PTR_INVALID);
		}

		static void __init
		symbol_ptr(void)
		{
		@@ -462,8 +480,7 @@ struct_rtc_time(void)
		.tm_year = 118,
		};

		test_hashed("%pt", &tm);

		test("(%ptR?)", "%pt", &tm);
		test("2018-11-26T05:35:43", "%ptR", &tm);
		test("0118-10-26T05:35:43", "%ptRr", &tm);
		test("05:35:43\|2018-11-26", "%ptRt\|%ptRd", &tm, &tm);
		@@ -572,6 +589,8 @@ static void __init
		test_pointer(void)
		{
		plain();
		null_pointer();
		invalid_pointer();
		symbol_ptr();
		kernel_ptr();
		struct_resource();

+271 −160

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