diff options
authorMasahiro Yamada <masahiroy@kernel.org>2020-06-01 14:57:19 +0900
committerMasahiro Yamada <masahiroy@kernel.org>2020-06-06 23:38:13 +0900
commit7c8f5662c502b7b967399fef8a64532ec43b063d (patch)
parentmodpost: fix potential mmap'ed file overrun in get_src_version() (diff)
modpost: avoid false-positive file open error
One problem of grab_file() is that it cannot distinguish the following two cases: - It cannot read the file (the file does not exist, or read permission is not set) - It can read the file, but the file size is zero This is because grab_file() calls mmap(), which requires the mapped length is greater than 0. Hence, grab_file() fails for both cases. If an empty header file were included for checksum calculation, the following warning would be printed: WARNING: modpost: could not open ...: Invalid argument An empty file is a valid source file, so it should not fail. Use read_text_file() instead. It can read a zero-length file. Then, parse_file() will succeed with doing nothing. Going forward, the first case (it cannot read the file) is a fatal error. If the source file from which an object was compiled is missing, something went wrong. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
1 files changed, 3 insertions, 4 deletions
diff --git a/scripts/mod/sumversion.c b/scripts/mod/sumversion.c
index 5fb142db6195..9f77c9dfce20 100644
--- a/scripts/mod/sumversion.c
+++ b/scripts/mod/sumversion.c
@@ -258,9 +258,8 @@ static int parse_file(const char *fname, struct md4_ctx *md)
char *file;
unsigned long i, len;
- file = grab_file(fname, &len);
- if (!file)
- return 0;
+ file = read_text_file(fname);
+ len = strlen(file);
for (i = 0; i < len; i++) {
/* Collapse and ignore \ and CR. */
@@ -287,7 +286,7 @@ static int parse_file(const char *fname, struct md4_ctx *md)
add_char(file[i], md);
- release_file(file, len);
+ free(file);
return 1;
/* Check whether the file is a static library or not */