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>
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@ -106,6 +106,13 @@ config BINFMT_FLAT_ARGVP_ENVP_ON_STACK
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config BINFMT_FLAT_OLD_ALWAYS_RAM
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bool
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config BINFMT_FLAT_OLD
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bool "Enable support for very old legacy flat binaries"
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depends on BINFMT_FLAT
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help
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Support decade old uClinux FLAT format binaries. Unless you know
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you have some of those say N here.
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config BINFMT_ZFLAT
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bool "Enable ZFLAT support"
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depends on BINFMT_FLAT
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@ -374,6 +374,7 @@ failed:
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/****************************************************************************/
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#ifdef CONFIG_BINFMT_FLAT_OLD
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static void old_reloc(unsigned long rl)
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{
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static const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
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@ -411,6 +412,7 @@ static void old_reloc(unsigned long rl)
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pr_debug("Relocation became %lx\n", val);
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}
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#endif /* CONFIG_BINFMT_FLAT_OLD */
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/****************************************************************************/
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@ -461,6 +463,7 @@ static int load_flat_file(struct linux_binprm *bprm,
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if (flags & FLAT_FLAG_KTRACE)
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pr_info("Loading file: %s\n", bprm->filename);
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#ifdef CONFIG_BINFMT_FLAT_OLD
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if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
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pr_err("bad flat file version 0x%x (supported 0x%lx and 0x%lx)\n",
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rev, FLAT_VERSION, OLD_FLAT_VERSION);
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@ -476,6 +479,23 @@ static int load_flat_file(struct linux_binprm *bprm,
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goto err;
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}
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/*
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* fix up the flags for the older format, there were all kinds
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* of endian hacks, this only works for the simple cases
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*/
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if (rev == OLD_FLAT_VERSION &&
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(flags || IS_ENABLED(CONFIG_BINFMT_FLAT_OLD_ALWAYS_RAM)))
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flags = FLAT_FLAG_RAM;
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#else /* CONFIG_BINFMT_FLAT_OLD */
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if (rev != FLAT_VERSION) {
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pr_err("bad flat file version 0x%x (supported 0x%lx)\n",
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rev, FLAT_VERSION);
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ret = -ENOEXEC;
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goto err;
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}
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#endif /* !CONFIG_BINFMT_FLAT_OLD */
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/*
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* Make sure the header params are sane.
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* 28 bits (256 MB) is way more than reasonable in this case.
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@ -487,14 +507,6 @@ static int load_flat_file(struct linux_binprm *bprm,
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goto err;
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}
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/*
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* fix up the flags for the older format, there were all kinds
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* of endian hacks, this only works for the simple cases
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*/
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if (rev == OLD_FLAT_VERSION &&
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(flags || IS_ENABLED(CONFIG_BINFMT_FLAT_OLD_ALWAYS_RAM)))
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flags = FLAT_FLAG_RAM;
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#ifndef CONFIG_BINFMT_ZFLAT
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if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
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pr_err("Support for ZFLAT executables is not enabled.\n");
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@ -833,6 +845,7 @@ static int load_flat_file(struct linux_binprm *bprm,
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goto err;
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}
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}
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#ifdef CONFIG_BINFMT_FLAT_OLD
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} else {
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for (i = 0; i < relocs; i++) {
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__be32 relval;
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@ -840,6 +853,7 @@ static int load_flat_file(struct linux_binprm *bprm,
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return -EFAULT;
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old_reloc(ntohl(relval));
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}
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#endif /* CONFIG_BINFMT_FLAT_OLD */
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}
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flush_icache_range(start_code, end_code);
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