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| author | Takashi Iwai <tiwai@suse.de> | 2015-08-08 05:46:20 (GMT) |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2015-08-08 10:22:08 (GMT) |
| commit | 5cfb203a304deaaa8c7c5368722b214d24583137 (patch) | |
| tree | 922f699aaabbb7dd1154af56005357b1d14a0f8e /scripts/mod | |
| parent | dd2384a75d1c046faf068a6352732a204814b86d (diff) | |
| download | linux-5cfb203a304deaaa8c7c5368722b214d24583137.tar.xz | |
modpost: abort if a module symbol is too long
Module symbols have a limited length, but currently the build system
allows the build finishing even if the driver code contains a too long
symbol name, which eventually overflows the modversion_info[] item.
The compiler may catch at compiling *.mod.c like
CC xxx.mod.o
xxx.mod.c:18:16: warning: initializer-string for array of chars is too long
but it's merely a warning.
This patch adds the check of the symbol length in modpost and stops
the build properly.
Currently MODULE_NAME_LEN is defined in modpost.c instead of referring
to the definition in kernel header because including linux/module.h is
messy and we must cover cross-compilation.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'scripts/mod')
| -rw-r--r-- | scripts/mod/modpost.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index 12d3db3..d583c98 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -2133,6 +2133,11 @@ static void add_staging_flag(struct buffer *b, const char *name) buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n"); } +/* In kernel, this size is defined in linux/module.h; + * here we use Elf_Addr instead of long for covering cross-compile + */ +#define MODULE_NAME_LEN (64 - sizeof(Elf_Addr)) + /** * Record CRCs for unresolved symbols **/ @@ -2177,6 +2182,12 @@ static int add_versions(struct buffer *b, struct module *mod) s->name, mod->name); continue; } + if (strlen(s->name) >= MODULE_NAME_LEN) { + merror("too long symbol \"%s\" [%s.ko]\n", + s->name, mod->name); + err = 1; + break; + } buf_printf(b, "\t{ %#8x, __VMLINUX_SYMBOL_STR(%s) },\n", s->crc, s->name); } |