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Merge "lib/vsprintf: Less restrictive hashed pointer printing"

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qctecmdr 2019-12-09 14:12:05 -08:00 • committed by Gerrit - the friendly Code Review server
commit b324b99e6d
2 changed files with 14 additions and 0 deletions
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9
lib/Kconfig.debug
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@ -164,6 +164,15 @@ config DYNAMIC_DEBUG
See Documentation/admin-guide/dynamic-debug-howto.rst for additional
information.
config DEBUG_CONSOLE_UNHASHED_POINTERS
bool "Display unhashed kernel pointers"
depends on DEBUG_KERNEL
help
Pointers %p and %pK are normally hashed prior to being displayed to
prevent leaking kernel addresses. On debug builds, always print
actual pointer values, ignoring the kptr_restrict setting.
Not to be enabled on production builds.
endmenu # "printk and dmesg options"
menu "Compile-time checks and compiler options"

5
lib/vsprintf.c
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@ -2163,6 +2163,8 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
case 'V':
return va_format(buf, end, ptr, spec, fmt);
case 'K':
if (IS_ENABLED(CONFIG_DEBUG_CONSOLE_UNHASHED_POINTERS))
break;
return restricted_pointer(buf, end, ptr, spec);
case 'N':
return netdev_bits(buf, end, ptr, spec, fmt);
@ -2189,6 +2191,9 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
return pointer_string(buf, end, ptr, spec);
}
if (IS_ENABLED(CONFIG_DEBUG_CONSOLE_UNHASHED_POINTERS))
return pointer_string(buf, end, ptr, spec);
/* default is to _not_ leak addresses, hash before printing */
return ptr_to_id(buf, end, ptr, spec);
}