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-rw-r--r--arch/x86/mm/dump_pagetables.c84
1 files changed, 54 insertions, 30 deletions
diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
index 0002a3a33081..20621d753d5f 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -30,6 +30,7 @@ struct pg_state {
unsigned long start_address;
unsigned long current_address;
const struct addr_marker *marker;
+ bool to_dmesg;
};
struct addr_marker {
@@ -88,10 +89,28 @@ static struct addr_marker address_markers[] = {
#define PUD_LEVEL_MULT (PTRS_PER_PMD * PMD_LEVEL_MULT)
#define PGD_LEVEL_MULT (PTRS_PER_PUD * PUD_LEVEL_MULT)
+#define pt_dump_seq_printf(m, to_dmesg, fmt, args...) \
+({ \
+ if (to_dmesg) \
+ printk(KERN_INFO fmt, ##args); \
+ else \
+ if (m) \
+ seq_printf(m, fmt, ##args); \
+})
+
+#define pt_dump_cont_printf(m, to_dmesg, fmt, args...) \
+({ \
+ if (to_dmesg) \
+ printk(KERN_CONT fmt, ##args); \
+ else \
+ if (m) \
+ seq_printf(m, fmt, ##args); \
+})
+
/*
* Print a readable form of a pgprot_t to the seq_file
*/
-static void printk_prot(struct seq_file *m, pgprot_t prot, int level)
+static void printk_prot(struct seq_file *m, pgprot_t prot, int level, bool dmsg)
{
pgprotval_t pr = pgprot_val(prot);
static const char * const level_name[] =
@@ -99,47 +118,47 @@ static void printk_prot(struct seq_file *m, pgprot_t prot, int level)
if (!pgprot_val(prot)) {
/* Not present */
- seq_printf(m, " ");
+ pt_dump_cont_printf(m, dmsg, " ");
} else {
if (pr & _PAGE_USER)
- seq_printf(m, "USR ");
+ pt_dump_cont_printf(m, dmsg, "USR ");
else
- seq_printf(m, " ");
+ pt_dump_cont_printf(m, dmsg, " ");
if (pr & _PAGE_RW)
- seq_printf(m, "RW ");
+ pt_dump_cont_printf(m, dmsg, "RW ");
else
- seq_printf(m, "ro ");
+ pt_dump_cont_printf(m, dmsg, "ro ");
if (pr & _PAGE_PWT)
- seq_printf(m, "PWT ");
+ pt_dump_cont_printf(m, dmsg, "PWT ");
else
- seq_printf(m, " ");
+ pt_dump_cont_printf(m, dmsg, " ");
if (pr & _PAGE_PCD)
- seq_printf(m, "PCD ");
+ pt_dump_cont_printf(m, dmsg, "PCD ");
else
- seq_printf(m, " ");
+ pt_dump_cont_printf(m, dmsg, " ");
/* Bit 9 has a different meaning on level 3 vs 4 */
if (level <= 3) {
if (pr & _PAGE_PSE)
- seq_printf(m, "PSE ");
+ pt_dump_cont_printf(m, dmsg, "PSE ");
else
- seq_printf(m, " ");
+ pt_dump_cont_printf(m, dmsg, " ");
} else {
if (pr & _PAGE_PAT)
- seq_printf(m, "pat ");
+ pt_dump_cont_printf(m, dmsg, "pat ");
else
- seq_printf(m, " ");
+ pt_dump_cont_printf(m, dmsg, " ");
}
if (pr & _PAGE_GLOBAL)
- seq_printf(m, "GLB ");
+ pt_dump_cont_printf(m, dmsg, "GLB ");
else
- seq_printf(m, " ");
+ pt_dump_cont_printf(m, dmsg, " ");
if (pr & _PAGE_NX)
- seq_printf(m, "NX ");
+ pt_dump_cont_printf(m, dmsg, "NX ");
else
- seq_printf(m, "x ");
+ pt_dump_cont_printf(m, dmsg, "x ");
}
- seq_printf(m, "%s\n", level_name[level]);
+ pt_dump_cont_printf(m, dmsg, "%s\n", level_name[level]);
}
/*
@@ -178,7 +197,8 @@ static void note_page(struct seq_file *m, struct pg_state *st,
st->current_prot = new_prot;
st->level = level;
st->marker = address_markers;
- seq_printf(m, "---[ %s ]---\n", st->marker->name);
+ pt_dump_seq_printf(m, st->to_dmesg, "---[ %s ]---\n",
+ st->marker->name);
} else if (prot != cur || level != st->level ||
st->current_address >= st->marker[1].start_address) {
const char *unit = units;
@@ -188,17 +208,17 @@ static void note_page(struct seq_file *m, struct pg_state *st,
/*
* Now print the actual finished series
*/
- seq_printf(m, "0x%0*lx-0x%0*lx ",
- width, st->start_address,
- width, st->current_address);
+ pt_dump_seq_printf(m, st->to_dmesg, "0x%0*lx-0x%0*lx ",
+ width, st->start_address,
+ width, st->current_address);
delta = (st->current_address - st->start_address) >> 10;
while (!(delta & 1023) && unit[1]) {
delta >>= 10;
unit++;
}
- seq_printf(m, "%9lu%c ", delta, *unit);
- printk_prot(m, st->current_prot, st->level);
+ pt_dump_cont_printf(m, st->to_dmesg, "%9lu%c ", delta, *unit);
+ printk_prot(m, st->current_prot, st->level, st->to_dmesg);
/*
* We print markers for special areas of address space,
@@ -207,7 +227,8 @@ static void note_page(struct seq_file *m, struct pg_state *st,
*/
if (st->current_address >= st->marker[1].start_address) {
st->marker++;
- seq_printf(m, "---[ %s ]---\n", st->marker->name);
+ pt_dump_seq_printf(m, st->to_dmesg, "---[ %s ]---\n",
+ st->marker->name);
}
st->start_address = st->current_address;
@@ -296,7 +317,7 @@ static void walk_pud_level(struct seq_file *m, struct pg_state *st, pgd_t addr,
#define pgd_none(a) pud_none(__pud(pgd_val(a)))
#endif
-static void walk_pgd_level(struct seq_file *m)
+void ptdump_walk_pgd_level(struct seq_file *m, pgd_t *pgd)
{
#ifdef CONFIG_X86_64
pgd_t *start = (pgd_t *) &init_level4_pgt;
@@ -304,9 +325,12 @@ static void walk_pgd_level(struct seq_file *m)
pgd_t *start = swapper_pg_dir;
#endif
int i;
- struct pg_state st;
+ struct pg_state st = {};
- memset(&st, 0, sizeof(st));
+ if (pgd) {
+ start = pgd;
+ st.to_dmesg = true;
+ }
for (i = 0; i < PTRS_PER_PGD; i++) {
st.current_address = normalize_addr(i * PGD_LEVEL_MULT);
@@ -331,7 +355,7 @@ static void walk_pgd_level(struct seq_file *m)
static int ptdump_show(struct seq_file *m, void *v)
{
- walk_pgd_level(m);
+ ptdump_walk_pgd_level(m, NULL);
return 0;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.