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Printk changes for 5.2

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Merge tag 'printk-for-5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk

Pull printk updates from Petr Mladek:

 - Allow state reset of printk_once() calls.

 - Prevent crashes when dereferencing invalid pointers in vsprintf().
   Only the first byte is checked for simplicity.

 - Make vsprintf warnings consistent and inlined.

 - Treewide conversion of obsolete %pf, %pF to %ps, %pF printf
   modifiers.

 - Some clean up of vsprintf and test_printf code.

* tag 'printk-for-5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk:
  lib/vsprintf: Make function pointer_string static
  vsprintf: Limit the length of inlined error messages
  vsprintf: Avoid confusion between invalid address and value
  vsprintf: Prevent crash when dereferencing invalid pointers
  vsprintf: Consolidate handling of unknown pointer specifiers
  vsprintf: Factor out %pO handler as kobject_string()
  vsprintf: Factor out %pV handler as va_format()
  vsprintf: Factor out %p[iI] handler as ip_addr_string()
  vsprintf: Do not check address of well-known strings
  vsprintf: Consistent %pK handling for kptr_restrict == 0
  vsprintf: Shuffle restricted_pointer()
  printk: Tie printk_once / printk_deferred_once into .data.once for reset
  treewide: Switch printk users from %pf and %pF to %ps and %pS, respectively
  lib/test_printf: Switch to bitmap_zalloc()
This commit is contained in:
Linus Torvalds 2019-05-07 09:18:12 -07:00
commit 0968621917
60 changed files with 410 additions and 272 deletions
Download patch file Download diff file Expand all files Collapse all files

29
lib/test_printf.c
View file

@ -241,6 +241,7 @@ 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)
@ -270,7 +271,6 @@ plain_hash_to_buffer(const void *p, char *buf, size_t len)
return 0;
}
static int __init
plain_hash(void)
{
@ -327,6 +327,24 @@ 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)
{
@ -464,8 +482,7 @@ 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);
@ -483,14 +500,14 @@ static void __init
large_bitmap(void)
{
const int nbits = 1 << 16;
unsigned long *bits = kcalloc(BITS_TO_LONGS(nbits), sizeof(long), GFP_KERNEL);
unsigned long *bits = bitmap_zalloc(nbits, GFP_KERNEL);
if (!bits)
return;
bitmap_set(bits, 1, 20);
bitmap_set(bits, 60000, 15);
test("1-20,60000-60014", "%*pbl", nbits, bits);
kfree(bits);
bitmap_free(bits);
}
static void __init
@ -574,6 +591,8 @@ static void __init
test_pointer(void)
{
plain();
null_pointer();
invalid_pointer();
symbol_ptr();
kernel_ptr();
struct_resource();