From 13c3f50c914e6a51d11e1aba4a85c2223e197e13 Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Sun, 24 Jul 2016 11:30:15 -0400 Subject: [PATCH] binfmt_flat: assorted cleanups Remove excessive casts, do some code grouping, fix most important checkpatch.pl complaints, etc. No functional changes. Signed-off-by: Nicolas Pitre Reviewed-by: Greg Ungerer Signed-off-by: Greg Ungerer --- fs/binfmt_flat.c | 230 ++++++++++++++++++++++++++----------------------------- 1 file changed, 109 insertions(+), 121 deletions(-) diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c index caf9e39..892dba6 100644 --- a/fs/binfmt_flat.c +++ b/fs/binfmt_flat.c @@ -15,7 +15,6 @@ * JAN/99 -- coded full program relocation (gerg@snapgear.com) */ -#include #include #include #include @@ -25,8 +24,6 @@ #include #include #include -#include -#include #include #include #include @@ -34,10 +31,9 @@ #include #include #include -#include +#include #include -#include #include #include #include @@ -80,7 +76,7 @@ struct lib_info { unsigned long text_len; /* Length of text segment */ unsigned long entry; /* Start address for this module */ unsigned long build_date; /* When this one was compiled */ - short loaded; /* Has this library been loaded? */ + bool loaded; /* Has this library been loaded? */ } lib_list[MAX_SHARED_LIBS]; }; @@ -107,8 +103,8 @@ static struct linux_binfmt flat_format = { static int flat_core_dump(struct coredump_params *cprm) { printk("Process %s:%d received signr %d and should have core dumped\n", - current->comm, current->pid, (int) cprm->siginfo->si_signo); - return(1); + current->comm, current->pid, cprm->siginfo->si_signo); + return 1; } /****************************************************************************/ @@ -120,11 +116,11 @@ static int flat_core_dump(struct coredump_params *cprm) static unsigned long create_flat_tables( unsigned long pp, - struct linux_binprm * bprm) + struct linux_binprm *bprm) { - unsigned long *argv,*envp; - unsigned long * sp; - char * p = (char*)pp; + unsigned long *argv, *envp; + unsigned long *sp; + char *p = (char *)pp; int argc = bprm->argc; int envc = bprm->envc; char uninitialized_var(dummy); @@ -142,7 +138,7 @@ static unsigned long create_flat_tables( put_user(argc, sp); current->mm->arg_start = (unsigned long) p; - while (argc-->0) { + while (argc-- > 0) { put_user((unsigned long) p, argv++); do { get_user(dummy, p); p++; @@ -150,7 +146,7 @@ static unsigned long create_flat_tables( } put_user((unsigned long) NULL, argv); current->mm->arg_end = current->mm->env_start = (unsigned long) p; - while (envc-->0) { + while (envc-- > 0) { put_user((unsigned long)p, envp); envp++; do { get_user(dummy, p); p++; @@ -190,7 +186,7 @@ static int decompress_exec( loff_t fpos; int ret, retval; - DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset, (int)dst, (int)len); + DBG_FLT("decompress_exec(offset=%lx,buf=%p,len=%lx)\n", offset, dst, len); memset(&strm, 0, sizeof(strm)); strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL); @@ -243,7 +239,7 @@ static int decompress_exec( ret = 10; if (buf[3] & EXTRA_FIELD) { ret += 2 + buf[10] + (buf[11] << 8); - if (unlikely(LBUFSIZE <= ret)) { + if (unlikely(ret >= LBUFSIZE)) { DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n"); goto out_free_buf; } @@ -251,7 +247,7 @@ static int decompress_exec( if (buf[3] & ORIG_NAME) { while (ret < LBUFSIZE && buf[ret++] != 0) ; - if (unlikely(LBUFSIZE == ret)) { + if (unlikely(ret == LBUFSIZE)) { DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n"); goto out_free_buf; } @@ -259,7 +255,7 @@ static int decompress_exec( if (buf[3] & COMMENT) { while (ret < LBUFSIZE && buf[ret++] != 0) ; - if (unlikely(LBUFSIZE == ret)) { + if (unlikely(ret == LBUFSIZE)) { DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n"); goto out_free_buf; } @@ -327,17 +323,17 @@ calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp) r &= 0x00ffffff; /* Trim ID off here */ } if (id >= MAX_SHARED_LIBS) { - printk("BINFMT_FLAT: reference 0x%x to shared library %d", - (unsigned) r, id); + printk("BINFMT_FLAT: reference 0x%lx to shared library %d", + r, id); goto failed; } if (curid != id) { if (internalp) { - printk("BINFMT_FLAT: reloc address 0x%x not in same module " - "(%d != %d)", (unsigned) r, curid, id); + printk("BINFMT_FLAT: reloc address 0x%lx not in same module " + "(%d != %d)", r, curid, id); goto failed; - } else if ( ! p->lib_list[id].loaded && - load_flat_shared_library(id, p) < 0) { + } else if (!p->lib_list[id].loaded && + load_flat_shared_library(id, p) < 0) { printk("BINFMT_FLAT: failed to load library %d", id); goto failed; } @@ -358,8 +354,8 @@ calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp) text_len = p->lib_list[id].text_len; if (!flat_reloc_valid(r, start_brk - start_data + text_len)) { - printk("BINFMT_FLAT: reloc outside program 0x%x (0 - 0x%x/0x%x)", - (int) r,(int)(start_brk-start_data+text_len),(int)text_len); + printk("BINFMT_FLAT: reloc outside program 0x%lx (0 - 0x%lx/0x%lx)", + r, start_brk-start_data+text_len, text_len); goto failed; } @@ -369,7 +365,7 @@ calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp) addr = r - text_len + start_data; /* Range checked already above so doing the range tests is redundant...*/ - return(addr); + return addr; failed: printk(", killing %s!\n", current->comm); @@ -383,11 +379,11 @@ failed: static void old_reloc(unsigned long rl) { #ifdef DEBUG - char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" }; + static const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" }; #endif flat_v2_reloc_t r; unsigned long *ptr; - + r.value = rl; #if defined(CONFIG_COLDFIRE) ptr = (unsigned long *) (current->mm->start_code + r.reloc.offset); @@ -397,10 +393,10 @@ static void old_reloc(unsigned long rl) #ifdef DEBUG printk("Relocation of variable at DATASEG+%x " - "(address %p, currently %x) into segment %s\n", - r.reloc.offset, ptr, (int)*ptr, segment[r.reloc.type]); + "(address %p, currently %lx) into segment %s\n", + r.reloc.offset, ptr, *ptr, segment[r.reloc.type]); #endif - + switch (r.reloc.type) { case OLD_FLAT_RELOC_TYPE_TEXT: *ptr += current->mm->start_code; @@ -417,27 +413,25 @@ static void old_reloc(unsigned long rl) } #ifdef DEBUG - printk("Relocation became %x\n", (int)*ptr); + printk("Relocation became %lx\n", *ptr); #endif -} +} /****************************************************************************/ -static int load_flat_file(struct linux_binprm * bprm, +static int load_flat_file(struct linux_binprm *bprm, struct lib_info *libinfo, int id, unsigned long *extra_stack) { - struct flat_hdr * hdr; - unsigned long textpos = 0, datapos = 0, result; - unsigned long realdatastart = 0; - unsigned long text_len, data_len, bss_len, stack_len, flags; - unsigned long full_data; - unsigned long len, memp = 0; - unsigned long memp_size, extra, rlim; - unsigned long *reloc = 0, *rp; + struct flat_hdr *hdr; + unsigned long textpos, datapos, realdatastart; + unsigned long text_len, data_len, bss_len, stack_len, full_data, flags; + unsigned long len, memp, memp_size, extra, rlim; + unsigned long *reloc, *rp; struct inode *inode; - int i, rev, relocs = 0; + int i, rev, relocs; loff_t fpos; unsigned long start_code, end_code; + ssize_t result; int ret; hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */ @@ -478,11 +472,11 @@ static int load_flat_file(struct linux_binprm * bprm, ret = -ENOEXEC; goto err; } - + /* Don't allow old format executables to use shared libraries */ if (rev == OLD_FLAT_VERSION && id != 0) { - printk("BINFMT_FLAT: shared libraries are not available before rev 0x%x\n", - (int) FLAT_VERSION); + printk("BINFMT_FLAT: shared libraries are not available before rev 0x%lx\n", + FLAT_VERSION); ret = -ENOEXEC; goto err; } @@ -517,11 +511,9 @@ static int load_flat_file(struct linux_binprm * bprm, /* Flush all traces of the currently running executable */ if (id == 0) { - result = flush_old_exec(bprm); - if (result) { - ret = result; + ret = flush_old_exec(bprm); + if (ret) goto err; - } /* OK, This is the point of no return */ set_personality(PER_LINUX_32BIT); @@ -549,38 +541,38 @@ static int load_flat_file(struct linux_binprm * bprm, textpos = vm_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_EXECUTABLE, 0); if (!textpos || IS_ERR_VALUE(textpos)) { - if (!textpos) - textpos = (unsigned long) -ENOMEM; - printk("Unable to mmap process text, errno %d\n", (int)-textpos); ret = textpos; + if (!textpos) + ret = -ENOMEM; + printk("Unable to mmap process text, errno %d\n", ret); goto err; } len = data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long); len = PAGE_ALIGN(len); - realdatastart = vm_mmap(0, 0, len, + realdatastart = vm_mmap(NULL, 0, len, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0); if (realdatastart == 0 || IS_ERR_VALUE(realdatastart)) { + ret = realdatastart; if (!realdatastart) - realdatastart = (unsigned long) -ENOMEM; - printk("Unable to allocate RAM for process data, errno %d\n", - (int)-realdatastart); + ret = -ENOMEM; + printk("Unable to allocate RAM for process data, " + "errno %d\n", ret); vm_munmap(textpos, text_len); - ret = realdatastart; goto err; } datapos = ALIGN(realdatastart + MAX_SHARED_LIBS * sizeof(unsigned long), FLAT_DATA_ALIGN); - DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n", - (int)(data_len + bss_len + stack_len), (int)datapos); + DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%ld bytes): %lx\n", + data_len + bss_len + stack_len, datapos); fpos = ntohl(hdr->data_start); #ifdef CONFIG_BINFMT_ZFLAT if (flags & FLAT_FLAG_GZDATA) { - result = decompress_exec(bprm, fpos, (char *) datapos, + result = decompress_exec(bprm, fpos, (char *)datapos, full_data, 0); } else #endif @@ -589,29 +581,30 @@ static int load_flat_file(struct linux_binprm * bprm, full_data); } if (IS_ERR_VALUE(result)) { - printk("Unable to read data+bss, errno %d\n", (int)-result); + ret = result; + printk("Unable to read data+bss, errno %d\n", ret); vm_munmap(textpos, text_len); vm_munmap(realdatastart, len); - ret = result; goto err; } - reloc = (unsigned long *) (datapos+(ntohl(hdr->reloc_start)-text_len)); + reloc = (unsigned long *) + (datapos + (ntohl(hdr->reloc_start) - text_len)); memp = realdatastart; memp_size = len; } else { len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long); len = PAGE_ALIGN(len); - textpos = vm_mmap(0, 0, len, + textpos = vm_mmap(NULL, 0, len, PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0); if (!textpos || IS_ERR_VALUE(textpos)) { - if (!textpos) - textpos = (unsigned long) -ENOMEM; - printk("Unable to allocate RAM for process text/data, errno %d\n", - (int)-textpos); ret = textpos; + if (!textpos) + ret = -ENOMEM; + printk("Unable to allocate RAM for process text/data, " + "errno %d\n", ret); goto err; } @@ -629,10 +622,10 @@ static int load_flat_file(struct linux_binprm * bprm, * load it all in and treat it like a RAM load from now on */ if (flags & FLAT_FLAG_GZIP) { - result = decompress_exec(bprm, sizeof (struct flat_hdr), - (((char *) textpos) + sizeof (struct flat_hdr)), + result = decompress_exec(bprm, sizeof(struct flat_hdr), + (((char *)textpos) + sizeof(struct flat_hdr)), (text_len + full_data - - sizeof (struct flat_hdr)), + - sizeof(struct flat_hdr)), 0); memmove((void *) datapos, (void *) realdatastart, full_data); @@ -641,8 +634,7 @@ static int load_flat_file(struct linux_binprm * bprm, if (!IS_ERR_VALUE(result)) result = decompress_exec(bprm, text_len, (char *) datapos, full_data, 0); - } - else + } else #endif { result = read_code(bprm->file, textpos, 0, text_len); @@ -652,21 +644,19 @@ static int load_flat_file(struct linux_binprm * bprm, full_data); } if (IS_ERR_VALUE(result)) { - printk("Unable to read code+data+bss, errno %d\n",(int)-result); + ret = result; + printk("Unable to read code+data+bss, errno %d\n", ret); vm_munmap(textpos, text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long)); - ret = result; goto err; } } - if (flags & FLAT_FLAG_KTRACE) - printk("Mapping is %x, Entry point is %x, data_start is %x\n", - (int)textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start)); + start_code = textpos + sizeof(struct flat_hdr); + end_code = textpos + text_len; + text_len -= sizeof(struct flat_hdr); /* the real code len */ /* The main program needs a little extra setup in the task structure */ - start_code = textpos + sizeof (struct flat_hdr); - end_code = textpos + text_len; if (id == 0) { current->mm->start_code = start_code; current->mm->end_code = end_code; @@ -684,16 +674,14 @@ static int load_flat_file(struct linux_binprm * bprm, current->mm->context.end_brk = memp + memp_size - stack_len; } - if (flags & FLAT_FLAG_KTRACE) - printk("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n", - id ? "Lib" : "Load", bprm->filename, - (int) start_code, (int) end_code, - (int) datapos, - (int) (datapos + data_len), - (int) (datapos + data_len), - (int) (((datapos + data_len + bss_len) + 3) & ~3)); - - text_len -= sizeof(struct flat_hdr); /* the real code len */ + if (flags & FLAT_FLAG_KTRACE) { + printk("Mapping is %lx, Entry point is %x, data_start is %x\n", + textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start)); + printk("%s %s: TEXT=%lx-%lx DATA=%lx-%lx BSS=%lx-%lx\n", + id ? "Lib" : "Load", bprm->filename, + start_code, end_code, datapos, datapos + data_len, + datapos + data_len, (datapos + data_len + bss_len + 3) & ~3); + } /* Store the current module values into the global library structure */ libinfo->lib_list[id].start_code = start_code; @@ -703,7 +691,7 @@ static int load_flat_file(struct linux_binprm * bprm, libinfo->lib_list[id].loaded = 1; libinfo->lib_list[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos; libinfo->lib_list[id].build_date = ntohl(hdr->build_date); - + /* * We just load the allocations into some temporary memory to * help simplify all this mumbo jumbo @@ -743,14 +731,16 @@ static int load_flat_file(struct linux_binprm * bprm, */ if (rev > OLD_FLAT_VERSION) { unsigned long persistent = 0; - for (i=0; i < relocs; i++) { + for (i = 0; i < relocs; i++) { unsigned long addr, relval; - /* Get the address of the pointer to be - relocated (of course, the address has to be - relocated first). */ + /* + * Get the address of the pointer to be + * relocated (of course, the address has to be + * relocated first). + */ relval = ntohl(reloc[i]); - if (flat_set_persistent (relval, &persistent)) + if (flat_set_persistent(relval, &persistent)) continue; addr = flat_get_relocate_addr(relval); rp = (unsigned long *) calc_reloc(addr, libinfo, id, 1); @@ -780,14 +770,14 @@ static int load_flat_file(struct linux_binprm * bprm, } } } else { - for (i=0; i < relocs; i++) + for (i = 0; i < relocs; i++) old_reloc(ntohl(reloc[i])); } - + flush_icache_range(start_code, end_code); /* zero the BSS, BRK and stack areas */ - memset((void*)(datapos + data_len), 0, bss_len + + memset((void *)(datapos + data_len), 0, bss_len + (memp + memp_size - stack_len - /* end brk */ libinfo->lib_list[id].start_brk) + /* start brk */ stack_len); @@ -846,7 +836,7 @@ out: allow_write_access(bprm.file); fput(bprm.file); - return(res); + return res; } #endif /* CONFIG_BINFMT_SHARED_FLAT */ @@ -857,7 +847,7 @@ out: * libraries. There is no binary dependent code anywhere else. */ -static int load_flat_binary(struct linux_binprm * bprm) +static int load_flat_binary(struct linux_binprm *bprm) { struct lib_info libinfo; struct pt_regs *regs = current_pt_regs(); @@ -869,6 +859,7 @@ static int load_flat_binary(struct linux_binprm * bprm) int i, j; memset(&libinfo, 0, sizeof(libinfo)); + /* * We have to add the size of our arguments to our stack size * otherwise it's too easy for users to create stack overflows @@ -881,33 +872,33 @@ static int load_flat_binary(struct linux_binprm * bprm) stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */ stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */ stack_len += FLAT_STACK_ALIGN - 1; /* reserve for upcoming alignment */ - + res = load_flat_file(bprm, &libinfo, 0, &stack_len); if (res < 0) return res; - + /* Update data segment pointers for all libraries */ - for (i=0; imm->context.end_brk + stack_len + 3) & ~3) - 4; - DBG_FLT("p=%x\n", (int)p); + DBG_FLT("p=%lx\n", p); /* copy the arg pages onto the stack, this could be more efficient :-) */ for (i = TOP_OF_ARGS - 1; i >= bprm->p; i--) - * (char *) --p = + *(char *) --p = ((char *) page_address(bprm->page[i/PAGE_SIZE]))[i % PAGE_SIZE]; sp = (unsigned long *) create_flat_tables(p, bprm); - + /* Fake some return addresses to ensure the call chain will * initialise library in order for us. We are required to call * lib 1 first, then 2, ... and finally the main program (id 0). @@ -915,7 +906,7 @@ static int load_flat_binary(struct linux_binprm * bprm) start_addr = libinfo.lib_list[0].entry; #ifdef CONFIG_BINFMT_SHARED_FLAT - for (i = MAX_SHARED_LIBS-1; i>0; i--) { + for (i = MAX_SHARED_LIBS-1; i > 0; i--) { if (libinfo.lib_list[i].loaded) { /* Push previos first to call address */ --sp; put_user(start_addr, sp); @@ -923,16 +914,16 @@ static int load_flat_binary(struct linux_binprm * bprm) } } #endif - + /* Stash our initial stack pointer into the mm structure */ - current->mm->start_stack = (unsigned long )sp; + current->mm->start_stack = (unsigned long)sp; #ifdef FLAT_PLAT_INIT FLAT_PLAT_INIT(regs); #endif - DBG_FLT("start_thread(regs=0x%x, entry=0x%x, start_stack=0x%x)\n", - (int)regs, (int)start_addr, (int)current->mm->start_stack); - + + DBG_FLT("start_thread(regs=0x%p, entry=0x%lx, start_stack=0x%lx)\n", + regs, start_addr, current->mm->start_stack); start_thread(regs, start_addr, current->mm->start_stack); return 0; @@ -945,9 +936,6 @@ static int __init init_flat_binfmt(void) register_binfmt(&flat_format); return 0; } - -/****************************************************************************/ - core_initcall(init_flat_binfmt); /****************************************************************************/ -- 2.7.4