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Printk fixup for 5.2

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

Pull printk fixup from Petr Mladek:
 "Replace the problematic probe_kernel_read() with original simple
  pointer checks in vsprintf()"

* tag 'printk-for-5.2-fixes' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/pmladek/printk:
  vsprintf: Do not break early boot with probing addresses
This commit is contained in:
Linus Torvalds 2019-05-10 13:14:07 -04:00
commit e290e6af1d
1 changed files with 4 additions and 7 deletions
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11
lib/vsprintf.c
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@ -628,19 +628,16 @@ static char *error_string(char *buf, char *end, const char *s,
}
/*
* This is not a fool-proof test. 99% of the time that this will fault is
* due to a bad pointer, not one that crosses into bad memory. Just test
* the address to make sure it doesn't fault due to a poorly added printk
* during debugging.
* Do not call any complex external code here. Nested printk()/vsprintf()
* might cause infinite loops. Failures might break printk() and would
* be hard to debug.
*/
static const char *check_pointer_msg(const void *ptr)
{
char byte;
if (!ptr)
return "(null)";
if (probe_kernel_address(ptr, byte))
if ((unsigned long)ptr < PAGE_SIZE || IS_ERR_VALUE(ptr))
return "(efault)";
return NULL;