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linux-user: factor out reading of /proc/self/maps

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Unfortunately reading /proc/self/maps is still considered the gold
standard for a process finding out about it's own memory layout. As we
will want this data in other contexts soon factor out the code to read
and parse the data. Rather than just blindly copying the existing
sscanf based code we use a more modern glib version of the parsing
code to make a more general purpose map structure.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20200403191150.863-9-alex.bennee@linaro.org>
This commit is contained in:
Alex Bennée 2020-04-03 20:11:46 +01:00
parent 2f311075b7
commit 01ef6b9e4e
4 changed files with 151 additions and 30 deletions
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58
linux-user/syscall.c
View file

@ -117,6 +117,7 @@
#include "qemu.h"
#include "qemu/guest-random.h"
#include "qemu/selfmap.h"
#include "user/syscall-trace.h"
#include "qapi/error.h"
#include "fd-trans.h"
@ -7232,45 +7233,45 @@ static int open_self_maps(void *cpu_env, int fd)
{
CPUState *cpu = env_cpu((CPUArchState *)cpu_env);
TaskState *ts = cpu->opaque;
FILE *fp;
char *line = NULL;
size_t len = 0;
ssize_t read;
GSList *map_info = read_self_maps();
GSList *s;
fp = fopen("/proc/self/maps", "r");
if (fp == NULL) {
return -1;
}
for (s = map_info; s; s = g_slist_next(s)) {
MapInfo *e = (MapInfo *) s->data;
while ((read = getline(&line, &len, fp)) != -1) {
int fields, dev_maj, dev_min, inode;
uint64_t min, max, offset;
char flag_r, flag_w, flag_x, flag_p;
char path[512] = "";
fields = sscanf(line, "%"PRIx64"-%"PRIx64" %c%c%c%c %"PRIx64" %x:%x %d"
" %512s", &min, &max, &flag_r, &flag_w, &flag_x,
&flag_p, &offset, &dev_maj, &dev_min, &inode, path);
if ((fields < 10) || (fields > 11)) {
continue;
}
if (h2g_valid(min)) {
if (h2g_valid(e->start)) {
unsigned long min = e->start;
unsigned long max = e->end;
int flags = page_get_flags(h2g(min));
max = h2g_valid(max - 1) ? max : (uintptr_t)g2h(GUEST_ADDR_MAX) + 1;
const char *path;
max = h2g_valid(max - 1) ?
max : (uintptr_t) g2h(GUEST_ADDR_MAX) + 1;
if (page_check_range(h2g(min), max - min, flags) == -1) {
continue;
}
if (h2g(min) == ts->info->stack_limit) {
pstrcpy(path, sizeof(path), " [stack]");
path = " [stack]";
} else {
path = e->path;
}
dprintf(fd, TARGET_ABI_FMT_ptr "-" TARGET_ABI_FMT_ptr
" %c%c%c%c %08" PRIx64 " %02x:%02x %d %s%s\n",
h2g(min), h2g(max - 1) + 1, flag_r, flag_w,
flag_x, flag_p, offset, dev_maj, dev_min, inode,
path[0] ? " " : "", path);
" %c%c%c%c %08" PRIx64 " %s %"PRId64" %s%s\n",
h2g(min), h2g(max - 1) + 1,
e->is_read ? 'r' : '-',
e->is_write ? 'w' : '-',
e->is_exec ? 'x' : '-',
e->is_priv ? 'p' : '-',
(uint64_t) e->offset, e->dev, e->inode,
path ? " " : "", path ? path : "");
}
}
free_self_maps(map_info);
#ifdef TARGET_VSYSCALL_PAGE
/*
* We only support execution from the vsyscall page.
@ -7281,9 +7282,6 @@ static int open_self_maps(void *cpu_env, int fd)
TARGET_VSYSCALL_PAGE, TARGET_VSYSCALL_PAGE + TARGET_PAGE_SIZE);
#endif
free(line);
fclose(fp);
return 0;
}