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MINOR: cli/debug: validate addresses using may_access() in "debug dev stream"

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This function adds some control by verifying that the target address is
really readable. It will not protect against writing to wrong places,
but will at least protect against a large number of mistakes such as
incorrectly copy-pasted addresses.
This commit is contained in:
Willy Tarreau 2019-10-24 18:28:23 +02:00
parent 68680bb14e
commit 2b5520da47
1 changed files with 8 additions and 3 deletions
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11
src/debug.c
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@ -460,14 +460,14 @@ static int debug_parse_cli_stream(char **args, char *payload, struct appctx *app
} else if (isteq(name, ist("sib.s"))) {
ptr = &s->si[1].state; size = sizeof(s->si[1].state);
} else if (isteq(name, ist("wake"))) {
if (s)
if (s && may_access(s) && may_access((void *)s + sizeof(*s) - 1))
task_wakeup(s->task, TASK_WOKEN_TIMER|TASK_WOKEN_IO|TASK_WOKEN_MSG);
continue;
} else
return cli_dynerr(appctx, memprintf(&msg, "Unsupported field name: '%s'.\n", word));
/* read previous value */
if (s && ptr) {
if ((s || ptr == &s) && ptr && may_access(ptr) && may_access(ptr + size - 1)) {
if (size == 8)
old = read_u64(ptr);
else if (size == 4)
@ -476,6 +476,11 @@ static int debug_parse_cli_stream(char **args, char *payload, struct appctx *app
old = read_u16(ptr);
else
old = *(const uint8_t *)ptr;
} else {
memprintf(&msg,
"%sSkipping inaccessible pointer %p for field '%.*s'.\n",
msg ? msg : "", ptr, (int)(end - word), word);
continue;
}
/* parse the new value . */
@ -517,7 +522,7 @@ static int debug_parse_cli_stream(char **args, char *payload, struct appctx *app
}
/* write the new value */
if (s && ptr && new != old) {
if (new != old) {
if (size == 8)
write_u64(ptr, new);
else if (size == 4)