[PATCH v4 02/12] binfmt_flat: convert printk invocations to their modern form

From: Nicolas Pitre
Date: Wed Jul 20 2016 - 15:22:55 EST

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Signed-off-by: Nicolas Pitre <nico@xxxxxxxxxx>
---
fs/binfmt_flat.c | 118 ++++++++++++++++++++++++-------------------------------
1 file changed, 51 insertions(+), 67 deletions(-)

diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index 892dba62bf..c3ccdefdea 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -15,6 +15,8 @@
* JAN/99 -- coded full program relocation (gerg@xxxxxxxxxxxx)
*/

+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
@@ -40,16 +42,6 @@

/****************************************************************************/

-#if 0
-#define DEBUG 1
-#endif
-
-#ifdef DEBUG
-#define DBG_FLT(a...) printk(a)
-#else
-#define DBG_FLT(a...)
-#endif
-
/*
* User data (data section and bss) needs to be aligned.
* We pick 0x20 here because it is the max value elf2flt has always
@@ -102,8 +94,8 @@ 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, cprm->siginfo->si_signo);
+ pr_warn("Process %s:%d received signr %d and should have core dumped\n",
+ current->comm, current->pid, cprm->siginfo->si_signo);
return 1;
}

@@ -186,17 +178,17 @@ static int decompress_exec(
loff_t fpos;
int ret, retval;

- DBG_FLT("decompress_exec(offset=%lx,buf=%p,len=%lx)\n", offset, dst, len);
+ pr_debug("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);
if (strm.workspace == NULL) {
- DBG_FLT("binfmt_flat: no memory for decompress workspace\n");
+ pr_debug("no memory for decompress workspace\n");
return -ENOMEM;
}
buf = kmalloc(LBUFSIZE, GFP_KERNEL);
if (buf == NULL) {
- DBG_FLT("binfmt_flat: no memory for read buffer\n");
+ pr_debug("no memory for read buffer\n");
retval = -ENOMEM;
goto out_free;
}
@@ -214,25 +206,25 @@ static int decompress_exec(

/* Check minimum size -- gzip header */
if (ret < 10) {
- DBG_FLT("binfmt_flat: file too small?\n");
+ pr_debug("file too small?\n");
goto out_free_buf;
}

/* Check gzip magic number */
if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) {
- DBG_FLT("binfmt_flat: unknown compression magic?\n");
+ pr_debug("unknown compression magic?\n");
goto out_free_buf;
}

/* Check gzip method */
if (buf[2] != 8) {
- DBG_FLT("binfmt_flat: unknown compression method?\n");
+ pr_debug("unknown compression method?\n");
goto out_free_buf;
}
/* Check gzip flags */
if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) ||
(buf[3] & RESERVED)) {
- DBG_FLT("binfmt_flat: unknown flags?\n");
+ pr_debug("unknown flags?\n");
goto out_free_buf;
}

@@ -240,7 +232,7 @@ static int decompress_exec(
if (buf[3] & EXTRA_FIELD) {
ret += 2 + buf[10] + (buf[11] << 8);
if (unlikely(ret >= LBUFSIZE)) {
- DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n");
+ pr_debug("buffer overflow (EXTRA)?\n");
goto out_free_buf;
}
}
@@ -248,7 +240,7 @@ static int decompress_exec(
while (ret < LBUFSIZE && buf[ret++] != 0)
;
if (unlikely(ret == LBUFSIZE)) {
- DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n");
+ pr_debug("buffer overflow (ORIG_NAME)?\n");
goto out_free_buf;
}
}
@@ -256,7 +248,7 @@ static int decompress_exec(
while (ret < LBUFSIZE && buf[ret++] != 0)
;
if (unlikely(ret == LBUFSIZE)) {
- DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n");
+ pr_debug("buffer overflow (COMMENT)?\n");
goto out_free_buf;
}
}
@@ -269,7 +261,7 @@ static int decompress_exec(
strm.total_out = 0;

if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) {
- DBG_FLT("binfmt_flat: zlib init failed?\n");
+ pr_debug("zlib init failed?\n");
goto out_free_buf;
}

@@ -286,7 +278,7 @@ static int decompress_exec(
}

if (ret < 0) {
- DBG_FLT("binfmt_flat: decompression failed (%d), %s\n",
+ pr_debug("decompression failed (%d), %s\n",
ret, strm.msg);
goto out_zlib;
}
@@ -323,24 +315,23 @@ 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%lx to shared library %d",
- r, id);
+ pr_err("reference 0x%lx to shared library %d", r, id);
goto failed;
}
if (curid != id) {
if (internalp) {
- printk("BINFMT_FLAT: reloc address 0x%lx not in same module "
- "(%d != %d)", r, curid, id);
+ pr_err("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) {
- printk("BINFMT_FLAT: failed to load library %d", id);
+ pr_err("failed to load library %d", id);
goto failed;
}
/* Check versioning information (i.e. time stamps) */
if (p->lib_list[id].build_date && p->lib_list[curid].build_date &&
p->lib_list[curid].build_date < p->lib_list[id].build_date) {
- printk("BINFMT_FLAT: library %d is younger than %d", id, curid);
+ pr_err("library %d is younger than %d", id, curid);
goto failed;
}
}
@@ -354,7 +345,7 @@ 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%lx (0 - 0x%lx/0x%lx)",
+ pr_err("reloc outside program 0x%lx (0 - 0x%lx/0x%lx)",
r, start_brk-start_data+text_len, text_len);
goto failed;
}
@@ -368,7 +359,7 @@ calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp)
return addr;

failed:
- printk(", killing %s!\n", current->comm);
+ pr_cont(", killing %s!\n", current->comm);
send_sig(SIGSEGV, current, 0);

return RELOC_FAILED;
@@ -378,9 +369,7 @@ failed:

static void old_reloc(unsigned long rl)
{
-#ifdef DEBUG
static const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
-#endif
flat_v2_reloc_t r;
unsigned long *ptr;

@@ -391,11 +380,9 @@ static void old_reloc(unsigned long rl)
ptr = (unsigned long *) (current->mm->start_data + r.reloc.offset);
#endif

-#ifdef DEBUG
- printk("Relocation of variable at DATASEG+%x "
- "(address %p, currently %lx) into segment %s\n",
- r.reloc.offset, ptr, *ptr, segment[r.reloc.type]);
-#endif
+ pr_debug("Relocation of variable at DATASEG+%x "
+ "(address %p, currently %lx) into segment %s\n",
+ r.reloc.offset, ptr, *ptr, segment[r.reloc.type]);

switch (r.reloc.type) {
case OLD_FLAT_RELOC_TYPE_TEXT:
@@ -408,13 +395,11 @@ static void old_reloc(unsigned long rl)
*ptr += current->mm->end_data;
break;
default:
- printk("BINFMT_FLAT: Unknown relocation type=%x\n", r.reloc.type);
+ pr_err("Unknown relocation type=%x\n", r.reloc.type);
break;
}

-#ifdef DEBUG
- printk("Relocation became %lx\n", *ptr);
-#endif
+ pr_debug("Relocation became %lx\n", *ptr);
}

/****************************************************************************/
@@ -463,20 +448,19 @@ static int load_flat_file(struct linux_binprm *bprm,
}

if (flags & FLAT_FLAG_KTRACE)
- printk("BINFMT_FLAT: Loading file: %s\n", bprm->filename);
+ pr_info("Loading file: %s\n", bprm->filename);

if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
- printk("BINFMT_FLAT: bad flat file version 0x%x (supported "
- "0x%lx and 0x%lx)\n",
- rev, FLAT_VERSION, OLD_FLAT_VERSION);
+ pr_err("bad flat file version 0x%x (supported 0x%lx and 0x%lx)\n",
+ rev, FLAT_VERSION, OLD_FLAT_VERSION);
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%lx\n",
- FLAT_VERSION);
+ pr_err("shared libraries are not available before rev 0x%lx\n",
+ FLAT_VERSION);
ret = -ENOEXEC;
goto err;
}
@@ -490,7 +474,7 @@ static int load_flat_file(struct linux_binprm *bprm,

#ifndef CONFIG_BINFMT_ZFLAT
if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
- printk("Support for ZFLAT executables is not enabled.\n");
+ pr_err("Support for ZFLAT executables is not enabled.\n");
ret = -ENOEXEC;
goto err;
}
@@ -536,7 +520,7 @@ static int load_flat_file(struct linux_binprm *bprm,
* this should give us a ROM ptr, but if it doesn't we don't
* really care
*/
- DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n");
+ pr_debug("ROM mapping of file (we hope)\n");

textpos = vm_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC,
MAP_PRIVATE|MAP_EXECUTABLE, 0);
@@ -544,7 +528,7 @@ static int load_flat_file(struct linux_binprm *bprm,
ret = textpos;
if (!textpos)
ret = -ENOMEM;
- printk("Unable to mmap process text, errno %d\n", ret);
+ pr_err("Unable to mmap process text, errno %d\n", ret);
goto err;
}

@@ -557,7 +541,7 @@ static int load_flat_file(struct linux_binprm *bprm,
ret = realdatastart;
if (!realdatastart)
ret = -ENOMEM;
- printk("Unable to allocate RAM for process data, "
+ pr_err("Unable to allocate RAM for process data, "
"errno %d\n", ret);
vm_munmap(textpos, text_len);
goto err;
@@ -566,8 +550,8 @@ static int load_flat_file(struct linux_binprm *bprm,
MAX_SHARED_LIBS * sizeof(unsigned long),
FLAT_DATA_ALIGN);

- DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%ld bytes): %lx\n",
- data_len + bss_len + stack_len, datapos);
+ pr_debug("Allocated data+bss+stack (%ld bytes): %lx\n",
+ data_len + bss_len + stack_len, datapos);

fpos = ntohl(hdr->data_start);
#ifdef CONFIG_BINFMT_ZFLAT
@@ -582,7 +566,7 @@ static int load_flat_file(struct linux_binprm *bprm,
}
if (IS_ERR_VALUE(result)) {
ret = result;
- printk("Unable to read data+bss, errno %d\n", ret);
+ pr_err("Unable to read data+bss, errno %d\n", ret);
vm_munmap(textpos, text_len);
vm_munmap(realdatastart, len);
goto err;
@@ -603,7 +587,7 @@ static int load_flat_file(struct linux_binprm *bprm,
ret = textpos;
if (!textpos)
ret = -ENOMEM;
- printk("Unable to allocate RAM for process text/data, "
+ pr_err("Unable to allocate RAM for process text/data, "
"errno %d\n", ret);
goto err;
}
@@ -645,7 +629,7 @@ static int load_flat_file(struct linux_binprm *bprm,
}
if (IS_ERR_VALUE(result)) {
ret = result;
- printk("Unable to read code+data+bss, errno %d\n", ret);
+ pr_err("Unable to read code+data+bss, errno %d\n", ret);
vm_munmap(textpos, text_len + data_len + extra +
MAX_SHARED_LIBS * sizeof(unsigned long));
goto err;
@@ -675,12 +659,12 @@ static int load_flat_file(struct linux_binprm *bprm,
}

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);
+ pr_info("Mapping is %lx, Entry point is %x, data_start is %x\n",
+ textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start));
+ pr_info("%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 */
@@ -890,7 +874,7 @@ 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=%lx\n", p);
+ pr_debug("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--)
@@ -922,8 +906,8 @@ static int load_flat_binary(struct linux_binprm *bprm)
FLAT_PLAT_INIT(regs);
#endif

- DBG_FLT("start_thread(regs=0x%p, entry=0x%lx, start_stack=0x%lx)\n",
- regs, start_addr, current->mm->start_stack);
+ pr_debug("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

Next message: Nicolas Pitre: "[PATCH v4 04/12] elf_fdpic_transfer_args_to_stack(): make it generic"
Previous message: Rob Herring: "Re: [PATCH v2 3/5] ARM: sun8i: dt: Add DT bindings documentation for Allwinner sun8i-emac"
In reply to: Nicolas Pitre: "[PATCH v4 00/12] allow BFLT executables on systems with a MMU"
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