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authorChristoph Hellwig <hch@lst.de>2019-06-13 10:08:58 +0300
committerGreg Ungerer <gerg@kernel.org>2019-06-24 02:16:47 +0300
commitcf9a566c2c06ac34425c4faf6d32ac55ddbeea7a (patch)
tree0501adf34c4945107cc8e07bfce3ff23f7a56b58 /fs/binfmt_flat.c
parentaef0f78e7460cd2889fe5359b26f7ad3c9555630 (diff)
downloadlinux-cf9a566c2c06ac34425c4faf6d32ac55ddbeea7a.tar.xz
binfmt_flat: make support for old format binaries optional
No need to carry the extra code around, given that systems using flat binaries are generally very resource constrained. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
Diffstat (limited to 'fs/binfmt_flat.c')
-rw-r--r--fs/binfmt_flat.c30
1 files changed, 22 insertions, 8 deletions
diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index 404a0bedc85b..1e88f4e62e65 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -374,6 +374,7 @@ failed:
/****************************************************************************/
+#ifdef CONFIG_BINFMT_FLAT_OLD
static void old_reloc(unsigned long rl)
{
static const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
@@ -411,6 +412,7 @@ static void old_reloc(unsigned long rl)
pr_debug("Relocation became %lx\n", val);
}
+#endif /* CONFIG_BINFMT_FLAT_OLD */
/****************************************************************************/
@@ -461,6 +463,7 @@ static int load_flat_file(struct linux_binprm *bprm,
if (flags & FLAT_FLAG_KTRACE)
pr_info("Loading file: %s\n", bprm->filename);
+#ifdef CONFIG_BINFMT_FLAT_OLD
if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
pr_err("bad flat file version 0x%x (supported 0x%lx and 0x%lx)\n",
rev, FLAT_VERSION, OLD_FLAT_VERSION);
@@ -477,6 +480,23 @@ static int load_flat_file(struct linux_binprm *bprm,
}
/*
+ * fix up the flags for the older format, there were all kinds
+ * of endian hacks, this only works for the simple cases
+ */
+ if (rev == OLD_FLAT_VERSION &&
+ (flags || IS_ENABLED(CONFIG_BINFMT_FLAT_OLD_ALWAYS_RAM)))
+ flags = FLAT_FLAG_RAM;
+
+#else /* CONFIG_BINFMT_FLAT_OLD */
+ if (rev != FLAT_VERSION) {
+ pr_err("bad flat file version 0x%x (supported 0x%lx)\n",
+ rev, FLAT_VERSION);
+ ret = -ENOEXEC;
+ goto err;
+ }
+#endif /* !CONFIG_BINFMT_FLAT_OLD */
+
+ /*
* Make sure the header params are sane.
* 28 bits (256 MB) is way more than reasonable in this case.
* If some top bits are set we have probable binary corruption.
@@ -487,14 +507,6 @@ static int load_flat_file(struct linux_binprm *bprm,
goto err;
}
- /*
- * fix up the flags for the older format, there were all kinds
- * of endian hacks, this only works for the simple cases
- */
- if (rev == OLD_FLAT_VERSION &&
- (flags || IS_ENABLED(CONFIG_BINFMT_FLAT_OLD_ALWAYS_RAM)))
- flags = FLAT_FLAG_RAM;
-
#ifndef CONFIG_BINFMT_ZFLAT
if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
pr_err("Support for ZFLAT executables is not enabled.\n");
@@ -833,6 +845,7 @@ static int load_flat_file(struct linux_binprm *bprm,
goto err;
}
}
+#ifdef CONFIG_BINFMT_FLAT_OLD
} else {
for (i = 0; i < relocs; i++) {
__be32 relval;
@@ -840,6 +853,7 @@ static int load_flat_file(struct linux_binprm *bprm,
return -EFAULT;
old_reloc(ntohl(relval));
}
+#endif /* CONFIG_BINFMT_FLAT_OLD */
}
flush_icache_range(start_code, end_code);