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Merge branch 'lab2' of gitlab.unexploitable.systems:fedorind/jos into lab2

This commit is contained in:
Danila Fedorin 2019-04-29 21:01:43 -07:00
parent 0289ec3b3e c07415cffc
commit 9bec3d83bd
3 changed files with 123 additions and 3 deletions
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16
kern/ansi.h
View File

@ -3,6 +3,22 @@
#include <inc/types.h>
#define ACOL_WRAP(s) "\33[" s "m"
#define ACOL_BLACK ACOL_WRAP("30")
#define ACOL_RED ACOL_WRAP("31")
#define ACOL_GREEN ACOL_WRAP("32")
#define ACOL_YELLOW ACOL_WRAP("33")
#define ACOL_BLUE ACOL_WRAP("34")
#define ACOL_MAGENTA ACOL_WRAP("35")
#define ACOL_CYAN ACOL_WRAP("36")
#define ACOL_WHITE ACOL_WRAP("37")
#define ACOL_CLEAR ACOL_WRAP("0")
#define ACOL_TAG(c, s) "[" c s ACOL_CLEAR "] "
#define ACOL_NOTE(s) ACOL_TAG(ACOL_WHITE, " Note ") s
#define ACOL_WARN(s) ACOL_TAG(ACOL_YELLOW, "Warning") s
#define ACOL_ERR(s) ACOL_TAG(ACOL_RED, " Error ") s
struct AttrState {
uint8_t cattrs;
uint8_t attrs;

108
kern/monitor.c
View File

@ -7,9 +7,13 @@
#include <inc/assert.h>
#include <inc/x86.h>
#include <kern/ansi.h>
#include <kern/console.h>
#include <kern/monitor.h>
#include <kern/kdebug.h>
#include <kern/pmap.h>
#include <inc/string.h>
#define CMDBUF_SIZE 80 // enough for one VGA text line
@ -25,7 +29,10 @@ struct Command {
static struct Command commands[] = {
{ "help", "Display this list of commands", mon_help },
{ "kerninfo", "Display information about the kernel", mon_kerninfo },
{ "backtrace", "Display current backtrace", mon_backtrace }
{ "backtrace", "Display current backtrace", mon_backtrace },
{ "showmappings", "Display the physical mappings for range", mon_showmappings },
{ "mperms", "Change the permissions of a memory range", mon_mperms }
};
/***** Implementations of basic kernel monitor commands *****/
@ -46,7 +53,7 @@ mon_kerninfo(int argc, char **argv, struct Trapframe *tf)
extern char _start[], entry[], etext[], edata[], end[];
cprintf("Special kernel symbols:\n");
cprintf(" _start %08x (phys)\n", _start);
cprintf(" _start %08x (phys)\n", _start);
cprintf(" entry %08x (virt) %08x (phys)\n", entry, entry - KERNBASE);
cprintf(" etext %08x (virt) %08x (phys)\n", etext, etext - KERNBASE);
cprintf(" edata %08x (virt) %08x (phys)\n", edata, edata - KERNBASE);
@ -75,7 +82,7 @@ mon_backtrace(int argc, char **argv, struct Trapframe *tf)
ebp = (uint32_t*) ebp[0];
debuginfo_eip(eip, &info);
cprintf(" %s:%d: %.*s+%d\n",
cprintf(" %s:%d: %.*s+%d\n",
info.eip_file, info.eip_line,
info.eip_fn_namelen, info.eip_fn_name,
eip - info.eip_fn_addr);
@ -84,7 +91,102 @@ mon_backtrace(int argc, char **argv, struct Trapframe *tf)
return 0;
}
#define EXPECT_ARGS(n, ac) if(ac - 1 != n) { \
cprintf(ACOL_ERR("Expected %d arguments, " \
"got %d\n"), n, ac - 1); \
return 1; }
#define VA_TXT ACOL_CYAN "VA" ACOL_CLEAR
#define PA_TXT ACOL_GREEN "PA" ACOL_CLEAR
char*
decode_pte_perms(pte_t pte, char* buffer) {
buffer[0] = (pte & PTE_W) ? 'w' : 'r';
buffer[1] = (pte & PTE_U) ? 'u' : 'k';
return buffer;
}
void
get_pagebounds(char* one, char* two, uintptr_t* pone, uintptr_t* ptwo) {
long from = strtol(one, NULL, 0);
long to = strtol(two, NULL, 0);
*pone = ROUNDDOWN(from, PGSIZE);
*ptwo = ROUNDUP(to, PGSIZE);
if(*pone != from) cprintf(ACOL_WARN("Aligning start address %p down to %p\n"),
from, *pone);
if(*ptwo != to) cprintf(ACOL_WARN("Aligning end address %p up to %p\n"),
to, *ptwo);
}
int
mon_showmappings(int argc, char** argv, struct Trapframe* tf) {
EXPECT_ARGS(2, argc);
uintptr_t va_start, va_end;
char buffer[3] = {0};
get_pagebounds(argv[1], argv[2], &va_start, &va_end);
if(va_start == va_end) va_end += PGSIZE;
while(va_start < va_end) {
pte_t* pte = pgdir_walk(kern_pgdir, (const void*) va_start, 0);
cprintf(VA_TXT " 0x%08p -> ", va_start);
if(pte && (*pte & PTE_P)) {
cprintf(PA_TXT " 0x%08p (%s)\n", PTE_ADDR(*pte),
decode_pte_perms(*pte, buffer));
} else {
cprintf(PA_TXT " ------------\n");
}
va_start += PGSIZE;
}
return 0;
}
int mon_mperms(int argc, char** argv, struct Trapframe* tf) {
EXPECT_ARGS(3, argc);
pte_t perms = 0;
enum {
PERM_ADD,
PERM_REMOVE,
PERM_SET
} pmode;
const char* str = argv[1];
if(str[0] == '+') { pmode = PERM_ADD; str++; }
else if(str[0] == '-') { pmode = PERM_REMOVE; str++; }
else pmode = PERM_SET;
while(*str) {
if(*str == 'w') perms |= PTE_W;
else if(*str == 'u') perms |= PTE_U;
else {
cprintf(ACOL_ERR("Unknown permission character %c\n"), *str);
return 1;
}
str++;
}
uintptr_t va_start, va_end;
get_pagebounds(argv[2], argv[3], &va_start, &va_end);
if(va_start == va_end) va_end += PGSIZE;
while(va_start < va_end) {
pte_t* pte = pgdir_walk(kern_pgdir, (void*) va_start, 0);
if(!pte || !(*pte & PTE_P)) { va_start += PGSIZE; continue; }
if(pmode == PERM_ADD) {
*pte |= perms;
} else if(pmode == PERM_REMOVE) {
*pte &= ~perms;
} else if(pmode == PERM_SET) {
*pte = PTE_ADDR(*pte) | perms | PTE_P;
}
va_start += PGSIZE;
}
return 0;
}
/***** Kernel monitor command interpreter *****/

2
kern/monitor.h
View File

@ -15,5 +15,7 @@ void monitor(struct Trapframe *tf);
int mon_help(int argc, char **argv, struct Trapframe *tf);
int mon_kerninfo(int argc, char **argv, struct Trapframe *tf);
int mon_backtrace(int argc, char **argv, struct Trapframe *tf);
int mon_showmappings(int argc, char **argv, struct Trapframe *tf);
int mon_mperms(int argc, char** argv, struct Trapframe* tf);
#endif // !JOS_KERN_MONITOR_H