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Message-Id: <1468358862-11799-2-git-send-email-nicolas.pitre@linaro.org>
Date: Tue, 12 Jul 2016 17:27:33 -0400
From: Nicolas Pitre <nicolas.pitre@...aro.org>
To: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Alexander Viro <viro@...iv.linux.org.uk>,
David Howells <dhowells@...hat.com>,
Greg Ungerer <gerg@...ux-m68k.org>
Subject: [PATCH 01/10] binfmt_flat: assorted cleanups
Remove excessive casts, do some code grouping, etc.
No functional changes.
Signed-off-by: Nicolas Pitre <nico@...aro.org>
---
fs/binfmt_flat.c | 118 ++++++++++++++++++++++++++-----------------------------
1 file changed, 56 insertions(+), 62 deletions(-)
diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index caf9e39bb8..085059d879 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -80,7 +80,7 @@ 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];
};
@@ -107,7 +107,7 @@ 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);
+ current->comm, current->pid, cprm->siginfo->si_signo);
return(1);
}
@@ -190,7 +190,7 @@ 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);
@@ -358,8 +358,8 @@ 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;
}
@@ -383,7 +383,7 @@ 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;
@@ -397,8 +397,8 @@ 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) {
@@ -417,7 +417,7 @@ static void old_reloc(unsigned long rl)
}
#ifdef DEBUG
- printk("Relocation became %x\n", (int)*ptr);
+ printk("Relocation became %lx\n", *ptr);
#endif
}
@@ -427,17 +427,15 @@ 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;
+ 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 */
@@ -481,8 +479,8 @@ static int load_flat_file(struct linux_binprm * bprm,
/* 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 +515,9 @@ 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);
@@ -549,33 +545,33 @@ 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
@@ -589,29 +585,30 @@ 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;
}
@@ -652,21 +649,19 @@ 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));
-
- /* The main program needs a little extra setup in the task structure */
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 */
if (id == 0) {
current->mm->start_code = start_code;
current->mm->end_code = end_code;
@@ -684,16 +679,14 @@ 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;
@@ -869,6 +862,7 @@ 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
@@ -899,7 +893,7 @@ static int load_flat_binary(struct linux_binprm * bprm)
set_binfmt(&flat_format);
p = ((current->mm->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--)
@@ -930,9 +924,9 @@ static int load_flat_binary(struct linux_binprm * bprm)
#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;
--
2.7.4
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