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From: Chris Fries <cfries@google.com>
Date: Thu, 27 Apr 2017 23:29:40 -0500
Subject: lib: vsprintf: Add "%paP", "%padP" options
Add %paP and %padP for physical address that need to always be shown
regardless of kptr restrictions.
Signed-off-by: Chris Fries <cfries@google.com>
---
---
Documentation/printk-formats.txt | 10 ++++++----
lib/vsprintf.c | 12 +++++++++---
2 files changed, 15 insertions(+), 7 deletions(-)
--- a/Documentation/printk-formats.txt
+++ b/Documentation/printk-formats.txt
@@ -82,18 +82,20 @@ Struct Resources:
Physical addresses types phys_addr_t:
- %pa[p] 0x01234567 or 0x0123456789abcdef
+ %pa[p][P] 0x01234567 or 0x0123456789abcdef
For printing a phys_addr_t type (and its derivatives, such as
resource_size_t) which can vary based on build options, regardless of
- the width of the CPU data path. Passed by reference.
+ the width of the CPU data path. Passed by reference. Use the trailing
+ 'P' if it needs to be always shown.
DMA addresses types dma_addr_t:
- %pad 0x01234567 or 0x0123456789abcdef
+ %pad[P] 0x01234567 or 0x0123456789abcdef
For printing a dma_addr_t type which can vary based on build options,
- regardless of the width of the CPU data path. Passed by reference.
+ regardless of the width of the CPU data path. Passed by reference. Use
+ the trailing 'P' if it needs to be always shown.
Raw buffer as an escaped string:
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1394,23 +1394,29 @@ static noinline_for_stack
char *address_val(char *buf, char *end, const void *addr, const char *fmt)
{
unsigned long long num;
+ int cleanse = kptr_restrict_cleanse_addresses();
+ int decleanse_idx = 1;
int size;
switch (fmt[1]) {
case 'd':
num = *(const dma_addr_t *)addr;
size = sizeof(dma_addr_t);
+ decleanse_idx = 2;
break;
case 'p':
+ decleanse_idx = 2;
+ /* fall thru */
default:
num = *(const phys_addr_t *)addr;
size = sizeof(phys_addr_t);
break;
}
- return special_hex_number(buf, end,
- kptr_restrict_cleanse_addresses() ? 0UL : num,
- size);
+ /* 'P' on the tail means don't restrict the pointer. */
+ cleanse = cleanse && (fmt[decleanse_idx] != 'P');
+
+ return special_hex_number(buf, end, cleanse ? 0UL : num, size);
}
static noinline_for_stack
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