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fix invalid data accesses in proxy driver callbacks

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all printing of auxiliary callback arguments must be conditional on the
command having actually succeeded. this affected fetch_msg() most, which
outright crashed due to a null pointer deref.

to fix this for good, we automate the generation of the status printing
and checking. as a side effect, this fixes the fetch_msg() callback not
printing the status at all.

amends 4cc5ad5a.
This commit is contained in:
Oswald Buddenhagen 2021-12-23 23:51:42 +01:00
parent 30a6015624
commit 87d1a4edde
2 changed files with 61 additions and 23 deletions
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41
src/drv_proxy.c
View File

@ -172,6 +172,28 @@ static @type@proxy_@name@( store_t *gctx@decl_args@ )
}
//# END
//# TEMPLATE CALLBACK_VOID
debug( "%s[% 2d] Callback enter @name@\n", ctx->label, cmd->tag );
@print_cb_args@
//# END
//# TEMPLATE CALLBACK_STS
debug( "%s[% 2d] Callback enter @name@, sts=%d\n", ctx->label, cmd->tag, sts );
//# END
//# TEMPLATE CALLBACK_STS_PRN
debug( "%s[% 2d] Callback enter @name@, sts=%d\n", ctx->label, cmd->tag, sts );
if (sts == DRV_OK) {
@print_cb_args@
}
//# END
//# TEMPLATE CALLBACK_STS_FMT
if (sts == DRV_OK) {
debug( "%s[% 2d] Callback enter @name@, sts=" stringify(DRV_OK) "@print_fmt_cb_args@\n", ctx->label, cmd->tag@print_pass_cb_args@ );
@print_cb_args@
} else {
debug( "%s[% 2d] Callback enter @name@, sts=%d\n", ctx->label, cmd->tag, sts );
}
//# END
//# TEMPLATE CALLBACK
typedef union {
gen_cmd_t gen;
@ -189,8 +211,7 @@ proxy_@name@_cb( @decl_cb_args@void *aux )
@name@_cmd_t *cmd = (@name@_cmd_t *)aux;
proxy_store_t *ctx = cmd->ctx;
debug( "%s[% 2d] Callback enter @name@@print_fmt_cb_args@\n", ctx->label, cmd->tag@print_pass_cb_args@ );
@print_cb_args@
@print_cb_args_tpl@
cmd->callback( @pass_cb_args@cmd->callback_aux );
debug( "%s[% 2d] Callback leave @name@\n", ctx->label, cmd->tag );
proxy_cmd_done( &cmd->gen );
@ -225,10 +246,8 @@ static @type@proxy_@name@( store_t *gctx@decl_args@, void (*cb)( @decl_cb_args@v
//# UNDEFINE list_store_print_fmt_cb_args
//# UNDEFINE list_store_print_pass_cb_args
//# DEFINE list_store_print_cb_args
if (sts == DRV_OK) {
for (string_list_t *box = boxes; box; box = box->next)
debug( " %s\n", box->string );
}
//# END
//# DEFINE prepare_load_box_print_fmt_args , opts=%s
@ -249,23 +268,19 @@ static @type@proxy_@name@( store_t *gctx@decl_args@, void (*cb)( @decl_cb_args@v
debug( "\n" );
}
//# END
//# DEFINE load_box_print_fmt_cb_args , sts=%d, total=%d, recent=%d
//# DEFINE load_box_print_pass_cb_args , sts, total_msgs, recent_msgs
//# DEFINE load_box_print_fmt_cb_args , total=%d, recent=%d
//# DEFINE load_box_print_pass_cb_args , total_msgs, recent_msgs
//# DEFINE load_box_print_cb_args
if (sts == DRV_OK) {
for (message_t *msg = msgs; msg; msg = msg->next)
debug( " uid=%-5u flags=%-4s size=%-6u tuid=%." stringify(TUIDL) "s\n",
msg->uid, (msg->status & M_FLAGS) ? fmt_flags( msg->flags ).str : "?", msg->size, *msg->tuid ? msg->tuid : "?" );
}
//# END
//# DEFINE find_new_msgs_print_fmt_cb_args , sts=%d
//# DEFINE find_new_msgs_print_pass_cb_args , sts
//# UNDEFINE find_new_msgs_print_fmt_cb_args
//# UNDEFINE find_new_msgs_print_pass_cb_args
//# DEFINE find_new_msgs_print_cb_args
if (sts == DRV_OK) {
for (message_t *msg = msgs; msg; msg = msg->next)
debug( " uid=%-5u tuid=%." stringify(TUIDL) "s\n", msg->uid, msg->tuid );
}
//# END
//# DEFINE fetch_msg_print_fmt_args , uid=%u, want_flags=%s, want_date=%s
@ -273,7 +288,7 @@ static @type@proxy_@name@( store_t *gctx@decl_args@, void (*cb)( @decl_cb_args@v
//# DEFINE fetch_msg_print_fmt_cb_args , flags=%s, date=%lld, size=%u
//# DEFINE fetch_msg_print_pass_cb_args , fmt_flags( cmd->data->flags ).str, (long long)cmd->data->date, cmd->data->len
//# DEFINE fetch_msg_print_cb_args
if (sts == DRV_OK && (DFlags & DEBUG_DRV_ALL)) {
if (DFlags & DEBUG_DRV_ALL) {
printf( "%s=========\n", cmd->ctx->label );
fwrite( cmd->data->data, cmd->data->len, 1, stdout );
printf( "%s=========\n", cmd->ctx->label );

29
src/drv_proxy_gen.pl
View File

@ -126,6 +126,7 @@ for (@ptypes) {
}
push @cmd_table, "proxy_$cmd_name";
next if (defined($special{$cmd_name}));
my $inc_tpl = "";
my %replace;
$replace{'name'} = $cmd_name;
$replace{'type'} = $cmd_type;
@ -139,9 +140,16 @@ for (@ptypes) {
my $cmd_cb_args = $1;
$replace{'decl_cb_args'} = $cmd_cb_args;
$replace{'pass_cb_args'} = make_args($cmd_cb_args);
my $cmd_print_cb_args = $cmd_cb_args =~ s/(.*), $/, $1/r;
$replace{'print_pass_cb_args'} = make_args($cmd_print_cb_args);
$replace{'print_fmt_cb_args'} = make_format($cmd_print_cb_args);
if (length($cmd_cb_args)) {
my $r_cmd_cb_args = $cmd_cb_args;
$r_cmd_cb_args =~ s/^int sts, // or die("Callback arguments of $cmd_name don't start with sts.\n");
$r_cmd_cb_args =~ s/^(.*), $/, $1/;
$replace{'print_pass_cb_args'} = make_args($r_cmd_cb_args);
$replace{'print_fmt_cb_args'} = make_format($r_cmd_cb_args);
$inc_tpl = 'CALLBACK_STS';
} else {
$inc_tpl = 'CALLBACK_VOID';
}
$pass_args = make_args($cmd_args);
$pass_args =~ s/([^, ]+)/cmd->$1/g;
@ -172,6 +180,21 @@ for (@ptypes) {
}
my %used;
my $text = $templates{$template};
if ($inc_tpl) {
if ($inc_tpl eq 'CALLBACK_STS') {
if ($replace{print_fmt_cb_args}) {
$inc_tpl .= '_FMT';
} else {
if ($replace{print_cb_args}) {
$inc_tpl .= '_PRN';
}
# These may be defined but empty; that's not an error.
delete $replace{print_fmt_cb_args};
delete $replace{print_pass_cb_args};
}
}
$text =~ s/^\t\@print_cb_args_tpl\@\n/$templates{$inc_tpl}/sm;
}
$text =~ s/^(\h*)\@(\w+)\@\n/$used{$2} = 1; indent($replace{$2} \/\/ "", $1)/smeg;
$text =~ s/\@(\w+)\@/$used{$1} = 1; $replace{$1} \/\/ ""/eg;
print $outh $text."\n";