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authorGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-07-17 09:17:51 +0000
committerGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-07-17 09:17:51 +0000
commit0f683f818cf087d580ba2edf7c096897bc28b95a (patch)
tree0324365d1cf7ec43679c202681fe55bfa81e439f /coreutils/printf.c
parent416914fc6115d2013433a5956febcffb5c8a0466 (diff)
downloadbusybox-0f683f818cf087d580ba2edf7c096897bc28b95a.tar.gz
busybox-0f683f818cf087d580ba2edf7c096897bc28b95a.tar.bz2
printf: protect against bogus format specifiers. Hopefully closes bug 4184
Diffstat (limited to 'coreutils/printf.c')
-rw-r--r--coreutils/printf.c22
1 files changed, 13 insertions, 9 deletions
diff --git a/coreutils/printf.c b/coreutils/printf.c
index a14306f5a..d877e0581 100644
--- a/coreutils/printf.c
+++ b/coreutils/printf.c
@@ -33,7 +33,8 @@
The 'format' argument is re-used as many times as necessary
to convert all of the given arguments.
- David MacKenzie <djm@gnu.ai.mit.edu> */
+ David MacKenzie <djm@gnu.ai.mit.edu>
+*/
// 19990508 Busy Boxed! Dave Cinege
@@ -251,10 +252,12 @@ static char **print_formatted(char *f, char **argv)
++f;
++direc_length;
}
- /*
- if (!strchr ("diouxXfeEgGcs", *f))
- fprintf(stderr, "%%%c: invalid directive", *f);
- */
+ /* needed - try "printf %" without it */
+ if (!strchr("diouxXfeEgGcs", *f)) {
+ bb_error_msg("invalid directive '%s'", direc_start);
+ /* causes main() to exit with error */
+ return saved_argv - 1;
+ }
++direc_length;
if (*argv) {
print_direc(direc_start, direc_length, field_width,
@@ -285,7 +288,8 @@ int printf_main(int argc UNUSED_PARAM, char **argv)
char **argv2;
/* We must check that stdout is not closed.
- * The reason for this is highly non-obvious. printf_main is used from shell.
+ * The reason for this is highly non-obvious.
+ * printf_main is used from shell.
* Shell must correctly handle 'printf "%s" foo'
* if stdout is closed. With stdio, output gets shoveled into
* stdout buffer, and even fflush cannot clear it out. It seems that
@@ -298,7 +302,7 @@ int printf_main(int argc UNUSED_PARAM, char **argv)
/* bash builtin errors out on "printf '-%s-\n' foo",
* coreutils-6.9 works. Both work with "printf -- '-%s-\n' foo".
* We will mimic coreutils. */
- if (argv[1] && argv[1][0] == '-' && argv[1][1] == '-' && argv[1][2] == '\0')
+ if (argv[1] && argv[1][0] == '-' && argv[1][1] == '-' && !argv[1][2])
argv++;
if (!argv[1])
bb_show_usage();
@@ -309,12 +313,12 @@ int printf_main(int argc UNUSED_PARAM, char **argv)
do {
argv = argv2;
argv2 = print_formatted(format, argv);
- } while (argv2 != argv && *argv2);
+ } while (argv2 > argv && *argv2);
/* coreutils compat (bash doesn't do this):
if (*argv)
fprintf(stderr, "excess args ignored");
*/
- return EXIT_SUCCESS;
+ return (argv2 < argv); /* if true, print_formatted errored out */
}