From: Masahiro Yamada <masahiroy@kernel.org>
To: linux-kbuild@vger.kernel.org
Cc: Masahiro Yamada <masahiroy@kernel.org>
Subject: [PATCH 25/37] modpost: avoid false-positive file open error
Date: Mon, 1 Jun 2020 14:57:19 +0900 [thread overview]
Message-ID: <20200601055731.3006266-25-masahiroy@kernel.org> (raw)
In-Reply-To: <20200601055731.3006266-1-masahiroy@kernel.org>
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>
---
scripts/mod/sumversion.c | 7 +++----
1 file 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 */
--
2.25.1
next prev parent reply other threads:[~2020-06-01 5:58 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-01 5:56 [PATCH 01/37] kbuild: refactor subdir-ym calculation Masahiro Yamada
2020-06-01 5:56 ` [PATCH 02/37] kbuild: refactor tagets caluculation for KBUILD_{BUILTIN,KBUILD_MODULES} Masahiro Yamada
2020-06-01 5:56 ` [PATCH 03/37] kbuild: merge init-y into core-y Masahiro Yamada
2020-06-01 5:56 ` [PATCH 04/37] kbuild: merge net-y and virt-y into drivers-y Masahiro Yamada
2020-06-01 5:56 ` [PATCH 05/37] kbuild: refactor KBUILD_VMLINUX_{OBJS,LIBS} calculation Masahiro Yamada
2020-06-03 4:21 ` Masahiro Yamada
2020-06-01 5:57 ` [PATCH 06/37] kbuild: update modules.order only when contained modules are updated Masahiro Yamada
2020-06-01 5:57 ` [PATCH 07/37] modpost: fix -i (--ignore-errors) MAKEFLAGS detection Masahiro Yamada
2020-06-01 5:57 ` [PATCH 08/37] modpost: move -T option close to the modpost command Masahiro Yamada
2020-06-01 5:57 ` [PATCH 09/37] modpost: pass -N option only for modules modpost Masahiro Yamada
2020-06-01 5:57 ` [PATCH 10/37] modpost: load KBUILD_EXTRA_SYMBOLS files in order Masahiro Yamada
2020-06-01 5:57 ` [PATCH 11/37] modpost: track if the symbol origin is a dump file or ELF object Masahiro Yamada
2020-06-01 5:57 ` [PATCH 12/37] modpost: allow to pass -i option multiple times to remove -e option Masahiro Yamada
2020-06-01 5:57 ` [PATCH 13/37] modpost: rename ext_sym_list to dump_list Masahiro Yamada
2020-06-01 5:57 ` [PATCH 14/37] modpost: re-add -e to set external_module flag Masahiro Yamada
2020-06-01 5:57 ` [PATCH 15/37] modpost: print symbol dump file as the build target in short log Masahiro Yamada
2020-06-01 5:57 ` [PATCH 16/37] modpost: refactor -i option calculation Masahiro Yamada
2020-06-01 5:57 ` [PATCH 17/37] modpost: generate vmlinux.symvers and reuse it for the second modpost Masahiro Yamada
2020-06-01 5:57 ` [PATCH 18/37] modpost: invoke modpost only when input files are updated Masahiro Yamada
2020-06-01 5:57 ` [PATCH 19/37] modpost: show warning if vmlinux is not found when processing modules Masahiro Yamada
2020-06-01 5:57 ` [PATCH 20/37] modpost: show warning if any of symbol dump files is missing Masahiro Yamada
2020-06-01 5:57 ` [PATCH 21/37] modpost: drop RCS/CVS $Revision handling in MODULE_VERSION() Masahiro Yamada
2020-06-01 5:57 ` [PATCH 22/37] modpost: do not call get_modinfo() for vmlinux(.o) Masahiro Yamada
2020-06-01 5:57 ` [PATCH 23/37] modpost: add read_text_file() and get_line() helpers Masahiro Yamada
2020-06-01 5:57 ` [PATCH 24/37] modpost: fix potential mmap'ed file overrun in get_src_version() Masahiro Yamada
2020-06-01 5:57 ` Masahiro Yamada [this message]
2020-06-01 5:57 ` [PATCH 26/37] modpost: use read_text_file() and get_line() for reading text files Masahiro Yamada
2020-06-01 5:57 ` [PATCH 27/37] modpost: remove get_next_text() and make {grab,release_}file static Masahiro Yamada
2020-06-01 5:57 ` [PATCH 28/37] modpost: remove -s option Masahiro Yamada
2020-06-01 5:57 ` [PATCH 29/37] modpost: move -d option in scripts/Makefile.modpost Masahiro Yamada
2020-06-01 5:57 ` [PATCH 30/37] modpost: remove mod->is_dot_o struct member Masahiro Yamada
2020-06-01 5:57 ` [PATCH 31/37] modpost: remove is_vmlinux() call in check_for_{gpl_usage,unused}() Masahiro Yamada
2020-06-01 5:57 ` [PATCH 32/37] modpost: add mod->is_vmlinux struct member Masahiro Yamada
2020-06-01 5:57 ` [PATCH 33/37] modpost: remove mod->skip " Masahiro Yamada
2020-06-01 5:57 ` [PATCH 34/37] modpost: set have_vmlinux in new_module() Masahiro Yamada
2020-06-01 5:57 ` [PATCH 35/37] modpost: strip .o from modname before calling new_module() Masahiro Yamada
2020-06-01 5:57 ` [PATCH 36/37] modpost: remove is_vmlinux() helper Masahiro Yamada
2020-06-01 5:57 ` [PATCH 37/37] modpost: change elf_info->size to size_t Masahiro Yamada
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