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Message-ID: <20170302075554.GA33308@beast>
Date: Wed, 1 Mar 2017 23:55:54 -0800
From: Kees Cook <keescook@...omium.org>
To: Russell King <linux@...linux.org.uk>
Cc: Afzal Mohammed <afzal.mohd.ma@...il.com>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ARM: dump: Add domain to output
This adds the memory domain (on non-LPAE) to the PMD and PTE dumps. This
isn't in the regular PMD bits because I couldn't find a clean way to
fall back to retain some of the PMD bits when reporting PTE. So this is
special-cased currently.
New output example:
---[ Modules ]---
0x7f000000-0x7f001000 4K DOMAIN_KERNEL ro x SHD MEM/CACHED/WBWA
0x7f001000-0x7f002000 4K DOMAIN_KERNEL ro NX SHD MEM/CACHED/WBWA
0x7f002000-0x7f004000 8K DOMAIN_KERNEL RW NX SHD MEM/CACHED/WBWA
---[ Kernel Mapping ]---
0x80000000-0x80100000 1M DOMAIN_KERNEL RW NX SHD
0x80100000-0x80800000 7M DOMAIN_KERNEL ro x SHD
0x80800000-0x80b00000 3M DOMAIN_KERNEL ro NX SHD
0x80b00000-0xa0000000 501M DOMAIN_KERNEL RW NX SHD
...
---[ Vectors ]---
0xffff0000-0xffff1000 4K DOMAIN_VECTORS USR ro x SHD MEM/CACHED/WBWA
0xffff1000-0xffff2000 4K DOMAIN_VECTORS ro x SHD MEM/CACHED/WBWA
Signed-off-by: Kees Cook <keescook@...omium.org>
---
arch/arm/mm/dump.c | 38 ++++++++++++++++++++++++++++++++++++--
1 file changed, 36 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mm/dump.c b/arch/arm/mm/dump.c
index 21192d6eda40..63faa33a83b1 100644
--- a/arch/arm/mm/dump.c
+++ b/arch/arm/mm/dump.c
@@ -17,6 +17,7 @@
#include <linux/mm.h>
#include <linux/seq_file.h>
+#include <asm/domain.h>
#include <asm/fixmap.h>
#include <asm/memory.h>
#include <asm/pgtable.h>
@@ -43,6 +44,7 @@ struct pg_state {
unsigned long start_address;
unsigned level;
u64 current_prot;
+ const char *domain;
};
struct prot_bits {
@@ -240,6 +242,8 @@ static void note_page(struct pg_state *st, unsigned long addr, unsigned level, u
unit++;
}
seq_printf(st->seq, "%9lu%c", delta, *unit);
+ if (st->domain)
+ seq_printf(st->seq, " %s", st->domain);
if (pg_level[st->level].bits)
dump_prot(st, pg_level[st->level].bits, pg_level[st->level].num);
seq_printf(st->seq, "\n");
@@ -267,6 +271,29 @@ static void walk_pte(struct pg_state *st, pmd_t *pmd, unsigned long start)
}
}
+static void set_domain_name(struct pg_state *st, pmd_t *pmd)
+{
+#ifndef CONFIG_ARM_LPAE
+ switch (pmd_val(*pmd) & PMD_DOMAIN_MASK) {
+ case PMD_DOMAIN(DOMAIN_KERNEL):
+ st->domain = "DOMAIN_KERNEL ";
+ break;
+ case PMD_DOMAIN(DOMAIN_USER):
+ st->domain = "DOMAIN_USER ";
+ break;
+ case PMD_DOMAIN(DOMAIN_IO):
+ st->domain = "DOMAIN_IO ";
+ break;
+ case PMD_DOMAIN(DOMAIN_VECTORS):
+ st->domain = "DOMAIN_VECTORS";
+ break;
+ default:
+ st->domain = "DOMAIN_unknown";
+ break;
+ }
+#endif
+}
+
static void walk_pmd(struct pg_state *st, pud_t *pud, unsigned long start)
{
pmd_t *pmd = pmd_offset(pud, 0);
@@ -275,14 +302,21 @@ static void walk_pmd(struct pg_state *st, pud_t *pud, unsigned long start)
for (i = 0; i < PTRS_PER_PMD; i++, pmd++) {
addr = start + i * PMD_SIZE;
+ set_domain_name(st, pmd);
if (pmd_none(*pmd) || pmd_large(*pmd) || !pmd_present(*pmd))
note_page(st, addr, 3, pmd_val(*pmd));
else
walk_pte(st, pmd, addr);
- if (SECTION_SIZE < PMD_SIZE && pmd_large(pmd[1]))
- note_page(st, addr + SECTION_SIZE, 3, pmd_val(pmd[1]));
+ if (SECTION_SIZE < PMD_SIZE && pmd_large(pmd[1])) {
+ addr += SECTION_SIZE;
+ pmd++;
+ set_domain_name(st, pmd);
+ note_page(st, addr, 3, pmd_val(*pmd));
+ }
}
+
+ st->domain = NULL;
}
static void walk_pud(struct pg_state *st, pgd_t *pgd, unsigned long start)
--
2.7.4
--
Kees Cook
Pixel Security
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