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Message-Id: <20060921085649.f8eeb0d1.rdunlap@xenotime.net>
Date: Thu, 21 Sep 2006 08:56:49 -0700
From: "Randy.Dunlap" <rdunlap@...otime.net>
To: "Luke Yang" <luke.adi@...il.com>
Cc: linux-kernel@...r.kernel.org, "Andrew Morton" <akpm@...l.org>
Subject: Re: [PATCH 4/4] Blackfin: binfmt patch to enhance stacking checking
On Thu, 21 Sep 2006 15:43:22 +0800 Luke Yang wrote:
> Please discuss about the patch first and I'll resend a renewed patch
> as attachment.
Much better, thanks.
Reviewed-by: Randy Dunlap <rdunlap@...otime.net>
> On 9/21/06, Luke Yang <luke.adi@...il.com> wrote:
> > Hi Randy,
> >
> > Thanks. Fixed the issues.
> >
> > Signed-off-by: Luke Yang <luke.adi@...il.com>
> >
> > fs/binfmt_elf_fdpic.c | 7 +-
> > fs/binfmt_flat.c | 144 ++++++++++++++++++++++++++++----------------
> > include/asm-arm/mmu.h | 1
> > include/asm-frv/mmu.h | 1
> > include/asm-h8300/mmu.h | 1
> > include/asm-m32r/mmu.h | 1
> > include/asm-m68knommu/mmu.h | 1
> > include/asm-sh/mmu.h | 1
> > include/asm-v850/mmu.h | 1
> > include/linux/flat.h | 13 ++-
> > 10 files changed, 112 insertions(+), 59 deletions(-)
> >
> > diff -urN linux-2.6.18.patch2/fs/binfmt_elf_fdpic.c
> > linux-2.6.18.patch3/fs/binfmt_elf_fdpic.c
> > --- linux-2.6.18.patch2/fs/binfmt_elf_fdpic.c 2006-09-21
> > 09:37:18.000000000 +0800
> > +++ linux-2.6.18.patch3/fs/binfmt_elf_fdpic.c 2006-09-21
> > 11:17:49.000000000 +0800
> > @@ -170,7 +170,7 @@
> > {
> > struct elf_fdpic_params exec_params, interp_params;
> > struct elf_phdr *phdr;
> > - unsigned long stack_size, entryaddr;
> > + unsigned long stack_size, entryaddr, requested_stack_size;
> > #ifndef CONFIG_MMU
> > unsigned long fullsize;
> > #endif
> > @@ -361,6 +361,7 @@
> > * - the stack starts at the top and works down
> > */
> > stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK;
> > + requested_stack_size = stack_size;
> > if (stack_size < PAGE_SIZE * 2)
> > stack_size = PAGE_SIZE * 2;
> >
> > @@ -388,6 +389,8 @@
> > current->mm->context.end_brk = current->mm->start_brk;
> > current->mm->context.end_brk +=
> > (stack_size > PAGE_SIZE) ? (stack_size - PAGE_SIZE) : 0;
> > + current->mm->context.stack_start =
> > + current->mm->start_brk + stack_size - requested_stack_size;
> > current->mm->start_stack = current->mm->start_brk + stack_size;
> > #endif
> >
> > @@ -959,6 +962,8 @@
> > }
> > #endif
> >
> > +extern void *safe_dma_memcpy(void *, const void *, size_t);
> > +
> > /*****************************************************************************/
> > /*
> > * map a binary by direct mmap() of the individual PT_LOAD segments
> > diff -urN linux-2.6.18.patch2/fs/binfmt_flat.c
> > linux-2.6.18.patch3/fs/binfmt_flat.c
> > --- linux-2.6.18.patch2/fs/binfmt_flat.c 2006-09-21 09:37:18.000000000 +0800
> > +++ linux-2.6.18.patch3/fs/binfmt_flat.c 2006-09-21 15:32:40.000000000 +0800
> > @@ -35,13 +35,13 @@
> > #include <linux/personality.h>
> > #include <linux/init.h>
> > #include <linux/flat.h>
> > -#include <linux/syscalls.h>
> >
> > #include <asm/byteorder.h>
> > #include <asm/system.h>
> > #include <asm/uaccess.h>
> > #include <asm/unaligned.h>
> > #include <asm/cacheflush.h>
> > +#include <asm/mmu_context.h>
> >
> > /****************************************************************************/
> >
> > @@ -77,6 +77,8 @@
> > static int load_flat_binary(struct linux_binprm *, struct pt_regs * regs);
> > static int flat_core_dump(long signr, struct pt_regs * regs, struct
> > file *file);
> >
> > +extern void dump_thread(struct pt_regs *, struct user *);
> > +
> > static struct linux_binfmt flat_format = {
> > .module = THIS_MODULE,
> > .load_binary = load_flat_binary,
> > @@ -413,7 +415,9 @@
> > /****************************************************************************/
> >
> > static int load_flat_file(struct linux_binprm * bprm,
> > - struct lib_info *libinfo, int id, unsigned long *extra_stack)
> > + struct lib_info *libinfo, int id,
> > + unsigned long *extra_stack,
> > + unsigned long *stack_base)
> > {
> > struct flat_hdr * hdr;
> > unsigned long textpos = 0, datapos = 0, result;
> > @@ -426,7 +430,6 @@
> > int i, rev, relocs = 0;
> > loff_t fpos;
> > unsigned long start_code, end_code;
> > - int ret;
> >
> > hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */
> > inode = bprm->file->f_dentry->d_inode;
> > @@ -451,24 +454,26 @@
> > */
> > if (strncmp(hdr->magic, "#!", 2))
> > printk("BINFMT_FLAT: bad header magic\n");
> > - ret = -ENOEXEC;
> > + result = -ENOEXEC;
> > goto err;
> > }
> > -
> > +#ifdef DEBUG
> > + flags |= FLAT_FLAG_KTRACE;
> > +#endif
> > if (flags & FLAT_FLAG_KTRACE)
> > printk("BINFMT_FLAT: 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%x and
> > 0x%x)\n", rev, FLAT_VERSION, OLD_FLAT_VERSION);
> > - ret = -ENOEXEC;
> > + result = -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);
> > - ret = -ENOEXEC;
> > + result = -ENOEXEC;
> > goto err;
> > }
> >
> > @@ -482,7 +487,7 @@
> > #ifndef CONFIG_BINFMT_ZFLAT
> > if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
> > printk("Support for ZFLAT executables is not enabled.\n");
> > - ret = -ENOEXEC;
> > + result = -ENOEXEC;
> > goto err;
> > }
> > #endif
> > @@ -496,17 +501,28 @@
> > if (rlim >= RLIM_INFINITY)
> > rlim = ~0;
> > if (data_len + bss_len > rlim) {
> > - ret = -ENOMEM;
> > + result = -ENOMEM;
> > goto err;
> > }
> >
> > + if (flags & FLAT_FLAG_L1STK) {
> > + if (stack_base == 0) {
> > + result = -ENOEXEC;
> > + goto err;
> > + }
> > + stack_len = alloc_l1stack(stack_len, stack_base);
> > + if (stack_len == 0) {
> > + result = -ENOEXEC;
> > + goto err;
> > + }
> > + *extra_stack = stack_len;
> > + }
> > +
> > /* Flush all traces of the currently running executable */
> > if (id == 0) {
> > result = flush_old_exec(bprm);
> > - if (result) {
> > - ret = result;
> > - goto err;
> > - }
> > + if (result)
> > + goto out_fail;
> >
> > /* OK, This is the point of no return */
> > set_personality(PER_LINUX_32BIT);
> > @@ -536,14 +552,17 @@
> > if (!textpos)
> > textpos = (unsigned long) -ENOMEM;
> > printk("Unable to mmap process text, errno %d\n", (int)-textpos);
> > - ret = textpos;
> > - goto err;
> > + result = textpos;
> > + goto out_fail;
> > }
> >
> > down_write(¤t->mm->mmap_sem);
> > realdatastart = do_mmap(0, 0, data_len + extra +
> > MAX_SHARED_LIBS * sizeof(unsigned long),
> > PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0);
> > + do_mremap(realdatastart, data_len + extra +
> > + MAX_SHARED_LIBS * sizeof(unsigned long),
> > + ksize((void *)realdatastart), 0, 0);
> > up_write(¤t->mm->mmap_sem);
> >
> > if (realdatastart == 0 || realdatastart >= (unsigned long)-4096) {
> > @@ -552,8 +571,8 @@
> > printk("Unable to allocate RAM for process data, errno %d\n",
> > (int)-datapos);
> > do_munmap(current->mm, textpos, text_len);
> > - ret = realdatastart;
> > - goto err;
> > + result = realdatastart;
> > + goto out_fail;
> > }
> > datapos = realdatastart + MAX_SHARED_LIBS * sizeof(unsigned long);
> >
> > @@ -575,8 +594,7 @@
> > printk("Unable to read data+bss, errno %d\n", (int)-result);
> > do_munmap(current->mm, textpos, text_len);
> > do_munmap(current->mm, realdatastart, data_len + extra);
> > - ret = result;
> > - goto err;
> > + goto out_fail;
> > }
> >
> > reloc = (unsigned long *) (datapos+(ntohl(hdr->reloc_start)-text_len));
> > @@ -588,15 +606,19 @@
> > textpos = do_mmap(0, 0, text_len + data_len + extra +
> > MAX_SHARED_LIBS * sizeof(unsigned long),
> > PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0);
> > - up_write(¤t->mm->mmap_sem);
> > if (!textpos || textpos >= (unsigned long) -4096) {
> > + up_write(¤t->mm->mmap_sem);
> > if (!textpos)
> > textpos = (unsigned long) -ENOMEM;
> > printk("Unable to allocate RAM for process text/data, errno %d\n",
> > (int)-textpos);
> > - ret = textpos;
> > - goto err;
> > + result = textpos;
> > + goto out_fail;
> > }
> > + do_mremap(textpos, text_len + data_len + extra +
> > + MAX_SHARED_LIBS * sizeof(unsigned long),
> > + ksize((void *)textpos), 0, 0);
> > + up_write(¤t->mm->mmap_sem);
> >
> > realdatastart = textpos + ntohl(hdr->data_start);
> > datapos = realdatastart + MAX_SHARED_LIBS * sizeof(unsigned long);
> > @@ -640,8 +662,7 @@
> > printk("Unable to read code+data+bss, errno %d\n",(int)-result);
> > do_munmap(current->mm, textpos, text_len + data_len + extra +
> > MAX_SHARED_LIBS * sizeof(unsigned long));
> > - ret = result;
> > - goto err;
> > + goto out_fail;
> > }
> > }
> >
> > @@ -665,6 +686,7 @@
> > current->mm->start_brk = datapos + data_len + bss_len;
> > current->mm->brk = (current->mm->start_brk + 3) & ~3;
> > current->mm->context.end_brk = memp + ksize((void *) memp) - stack_len;
> > + current->mm->context.stack_start = current->mm->context.end_brk;
> > }
> >
> > if (flags & FLAT_FLAG_KTRACE)
> > @@ -686,7 +708,7 @@
> > 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
> > @@ -705,8 +727,8 @@
> > if (*rp) {
> > addr = calc_reloc(*rp, libinfo, id, 0);
> > if (addr == RELOC_FAILED) {
> > - ret = -ENOEXEC;
> > - goto err;
> > + result = -ENOEXEC;
> > + goto out_fail;
> > }
> > *rp = addr;
> > }
> > @@ -725,6 +747,7 @@
> > * __start to address 4 so that is okay).
> > */
> > if (rev > OLD_FLAT_VERSION) {
> > + unsigned long persistent = 0;
> > for (i=0; i < relocs; i++) {
> > unsigned long addr, relval;
> >
> > @@ -732,16 +755,20 @@
> > relocated (of course, the address has to be
> > relocated first). */
> > relval = ntohl(reloc[i]);
> > + if (flat_set_persistent (relval, &persistent))
> > + continue;
> > addr = flat_get_relocate_addr(relval);
> > rp = (unsigned long *) calc_reloc(addr, libinfo, id, 1);
> > if (rp == (unsigned long *)RELOC_FAILED) {
> > - ret = -ENOEXEC;
> > - goto err;
> > + result = -ENOEXEC;
> > + goto out_fail;
> > }
> >
> > /* Get the pointer's value. */
> > - addr = flat_get_addr_from_rp(rp, relval, flags);
> > - if (addr != 0) {
> > + addr = flat_get_addr_from_rp(rp, relval, flags, &persistent);
> > + if (addr == 0)
> > + continue;
> > + if (! flat_addr_absolute (relval)) {
> > /*
> > * Do the relocation. PIC relocs in the data section are
> > * already in target order
> > @@ -750,30 +777,32 @@
> > addr = ntohl(addr);
> > addr = calc_reloc(addr, libinfo, id, 0);
> > if (addr == RELOC_FAILED) {
> > - ret = -ENOEXEC;
> > - goto err;
> > + result = -ENOEXEC;
> > + goto out_fail;
> > }
> > -
> > - /* Write back the relocated pointer. */
> > - flat_put_addr_at_rp(rp, addr, relval);
> > }
> > + /* Write back the relocated pointer. */
> > + flat_put_addr_at_rp(rp, addr, relval);
> > }
> > } else {
> > 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 + ksize((void *) memp) - stack_len - /* end brk */
> > libinfo->lib_list[id].start_brk) + /* start brk */
> > stack_len);
> >
> > return 0;
> > -err:
> > - return ret;
> > + out_fail:
> > + if (flags & FLAT_FLAG_L1STK)
> > + free_l1stack();
> > + err:
> > + return result;
> > }
> >
> >
> > @@ -804,7 +833,7 @@
> > res = prepare_binprm(&bprm);
> >
> > if (res <= (unsigned long)-4096)
> > - res = load_flat_file(&bprm, libs, id, NULL);
> > + res = load_flat_file(&bprm, libs, id, NULL, NULL);
> > if (bprm.file) {
> > allow_write_access(bprm.file);
> > fput(bprm.file);
> > @@ -827,6 +856,7 @@
> > unsigned long p = bprm->p;
> > unsigned long stack_len;
> > unsigned long start_addr;
> > + unsigned long l1stack_base, ramstack_top;
> > unsigned long *sp;
> > int res;
> > int i, j;
> > @@ -844,11 +874,11 @@
> > stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */
> > stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */
> >
> > -
> > - res = load_flat_file(bprm, &libinfo, 0, &stack_len);
> > + l1stack_base = 0;
> > + res = load_flat_file(bprm, &libinfo, 0, &stack_len, &l1stack_base);
> > if (res > (unsigned long)-4096)
> > return res;
> > -
> > +
> > /* Update data segment pointers for all libraries */
> > for (i=0; i<MAX_SHARED_LIBS; i++)
> > if (libinfo.lib_list[i].loaded)
> > @@ -863,6 +893,7 @@
> > set_binfmt(&flat_format);
> >
> > p = ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4;
> > + ramstack_top = p;
> > DBG_FLT("p=%x\n", (int)p);
> >
> > /* copy the arg pages onto the stack, this could be more efficient :-) */
> > @@ -871,7 +902,7 @@
> > ((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).
> > @@ -887,15 +918,24 @@
> > }
> > }
> > #endif
> > -
> > +
> > /* Stash our initial stack pointer into the mm structure */
> > current->mm->start_stack = (unsigned long )sp;
> >
> > -
> > - 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);
> > -
> > - start_thread(regs, start_addr, current->mm->start_stack);
> > + if (l1stack_base) {
> > + /* Find L1 stack pointer corresponding to the current bottom
> > + of the stack in normal RAM. */
> > + l1stack_base += stack_len - (ramstack_top - (unsigned long)sp);
> > + if (!activate_l1stack(current->mm, ramstack_top - stack_len))
> > + l1stack_base = 0;
> > + }
> > +
> > + DBG_FLT("start_thread(regs=0x%x, entry=0x%x, start_stack=0x%x,
> > l1stk=0x%x, len 0x%x)\n",
> > + (int)regs, (int)start_addr, (int)current->mm->start_stack, l1stack_base,
> > + stack_len);
> > +
> > + start_thread(regs, start_addr,
> > + l1stack_base ? l1stack_base : current->mm->start_stack);
> >
> > if (current->ptrace & PT_PTRACED)
> > send_sig(SIGTRAP, current, 0);
> > diff -urN linux-2.6.18.patch2/include/asm-arm/mmu.h
> > linux-2.6.18.patch3/include/asm-arm/mmu.h
> > --- linux-2.6.18.patch2/include/asm-arm/mmu.h 2006-09-21
> > 09:37:24.000000000 +0800
> > +++ linux-2.6.18.patch3/include/asm-arm/mmu.h 2006-09-21
> > 09:52:02.000000000 +0800
> > @@ -26,6 +26,7 @@
> > typedef struct {
> > struct vm_list_struct *vmlist;
> > unsigned long end_brk;
> > + unsigned long stack_start;
> > } mm_context_t;
> >
> > #endif
> > diff -urN linux-2.6.18.patch2/include/asm-frv/mmu.h
> > linux-2.6.18.patch3/include/asm-frv/mmu.h
> > --- linux-2.6.18.patch2/include/asm-frv/mmu.h 2006-09-21
> > 09:37:25.000000000 +0800
> > +++ linux-2.6.18.patch3/include/asm-frv/mmu.h 2006-09-21
> > 09:52:02.000000000 +0800
> > @@ -24,6 +24,7 @@
> > #else
> > struct vm_list_struct *vmlist;
> > unsigned long end_brk;
> > + unsigned long stack_start;
> >
> > #endif
> >
> > diff -urN linux-2.6.18.patch2/include/asm-h8300/mmu.h
> > linux-2.6.18.patch3/include/asm-h8300/mmu.h
> > --- linux-2.6.18.patch2/include/asm-h8300/mmu.h 2006-09-21
> > 09:37:26.000000000 +0800
> > +++ linux-2.6.18.patch3/include/asm-h8300/mmu.h 2006-09-21
> > 09:52:02.000000000 +0800
> > @@ -6,6 +6,7 @@
> > typedef struct {
> > struct vm_list_struct *vmlist;
> > unsigned long end_brk;
> > + unsigned long stack_start;
> > } mm_context_t;
> >
> > #endif
> > diff -urN linux-2.6.18.patch2/include/asm-m32r/mmu.h
> > linux-2.6.18.patch3/include/asm-m32r/mmu.h
> > --- linux-2.6.18.patch2/include/asm-m32r/mmu.h 2006-09-21
> > 09:37:26.000000000 +0800
> > +++ linux-2.6.18.patch3/include/asm-m32r/mmu.h 2006-09-21
> > 09:52:02.000000000 +0800
> > @@ -6,6 +6,7 @@
> > typedef struct {
> > struct vm_list_struct *vmlist;
> > unsigned long end_brk;
> > + unsigned long stack_start;
> > } mm_context_t;
> > #else
> >
> > diff -urN linux-2.6.18.patch2/include/asm-m68knommu/mmu.h
> > linux-2.6.18.patch3/include/asm-m68knommu/mmu.h
> > --- linux-2.6.18.patch2/include/asm-m68knommu/mmu.h 2006-09-21
> > 09:37:26.000000000 +0800
> > +++ linux-2.6.18.patch3/include/asm-m68knommu/mmu.h 2006-09-21
> > 09:52:02.000000000 +0800
> > @@ -6,6 +6,7 @@
> > typedef struct {
> > struct vm_list_struct *vmlist;
> > unsigned long end_brk;
> > + unsigned long stack_start;
> > } mm_context_t;
> >
> > #endif /* __M68KNOMMU_MMU_H */
> > diff -urN linux-2.6.18.patch2/include/asm-sh/mmu.h
> > linux-2.6.18.patch3/include/asm-sh/mmu.h
> > --- linux-2.6.18.patch2/include/asm-sh/mmu.h 2006-09-21 09:37:26.000000000 +0800
> > +++ linux-2.6.18.patch3/include/asm-sh/mmu.h 2006-09-21 09:52:02.000000000 +0800
> > @@ -17,6 +17,7 @@
> > typedef struct {
> > struct mm_tblock_struct tblock;
> > unsigned long end_brk;
> > + unsigned long stack_start;
> > } mm_context_t;
> >
> > #else
> > diff -urN linux-2.6.18.patch2/include/asm-v850/mmu.h
> > linux-2.6.18.patch3/include/asm-v850/mmu.h
> > --- linux-2.6.18.patch2/include/asm-v850/mmu.h 2006-09-21
> > 09:37:27.000000000 +0800
> > +++ linux-2.6.18.patch3/include/asm-v850/mmu.h 2006-09-21
> > 09:52:02.000000000 +0800
> > @@ -6,6 +6,7 @@
> > typedef struct {
> > struct vm_list_struct *vmlist;
> > unsigned long end_brk;
> > + unsigned long stack_start;
> > } mm_context_t;
> >
> > #endif /* __V850_MMU_H__ */
> > diff -urN linux-2.6.18.patch2/include/linux/flat.h
> > linux-2.6.18.patch3/include/linux/flat.h
> > --- linux-2.6.18.patch2/include/linux/flat.h 2006-09-21 09:37:27.000000000 +0800
> > +++ linux-2.6.18.patch3/include/linux/flat.h 2006-09-21 09:52:02.000000000 +0800
> > @@ -10,6 +10,13 @@
> > #ifndef _LINUX_FLAT_H
> > #define _LINUX_FLAT_H
> >
> > +#define FLAT_FLAG_RAM 0x0001 /* load program entirely into RAM */
> > +#define FLAT_FLAG_GOTPIC 0x0002 /* program is PIC with GOT */
> > +#define FLAT_FLAG_GZIP 0x0004 /* all but the header is compressed */
> > +#define FLAT_FLAG_GZDATA 0x0008 /* only data/relocs are compressed (for XIP) */
> > +#define FLAT_FLAG_KTRACE 0x0010 /* output useful kernel trace for debugging */
> > +#define FLAT_FLAG_L1STK 0x0020 /* use a 4k stack in L1 scratch memory. */
> > +
> > #ifdef __KERNEL__
> > #include <asm/flat.h>
> > #endif
> > @@ -50,12 +57,6 @@
> > unsigned long filler[5]; /* Reservered, set to zero */
> > };
> >
> > -#define FLAT_FLAG_RAM 0x0001 /* load program entirely into RAM */
> > -#define FLAT_FLAG_GOTPIC 0x0002 /* program is PIC with GOT */
> > -#define FLAT_FLAG_GZIP 0x0004 /* all but the header is compressed */
> > -#define FLAT_FLAG_GZDATA 0x0008 /* only data/relocs are compressed (for XIP) */
> > -#define FLAT_FLAG_KTRACE 0x0010 /* output useful kernel trace for debugging */
> > -
> >
> > #ifdef __KERNEL__ /* so systems without linux headers can compile the apps */
> > /*
> >
> >
> > On 9/21/06, Randy.Dunlap <rdunlap@...otime.net> wrote:
> > > On Thu, 21 Sep 2006 11:33:20 +0800 Luke Yang wrote:
> > >
> > > > Hi all,
> > >
> > > Patch is malformed due to format=flowed.
> > >
> > > > fs/binfmt_elf_fdpic.c | 7 +-
> > > > fs/binfmt_flat.c | 150 ++++++++++++++++++++++++++------------------
> > > > include/asm-arm/mmu.h | 1
> > > > include/asm-frv/mmu.h | 1
> > > > include/asm-h8300/mmu.h | 1
> > > > include/asm-m32r/mmu.h | 1
> > > > include/asm-m68knommu/mmu.h | 1
> > > > include/asm-sh/mmu.h | 1
> > > > include/asm-v850/mmu.h | 1
> > > > include/linux/flat.h | 13 ++-
> > > > 10 files changed, 112 insertions(+), 65 deletions(-)
> > >
> > > > diff -urN linux-2.6.18.patch2/fs/binfmt_flat.c
> > > > linux-2.6.18.patch3/fs/binfmt_flat.c
> > > > --- linux-2.6.18.patch2/fs/binfmt_flat.c 2006-09-21 09:37:18.000000000 +0800
> > > > +++ linux-2.6.18.patch3/fs/binfmt_flat.c 2006-09-21 09:52:02.000000000 +0800
> > > > @@ -16,6 +16,7 @@
> > > > */
> > > >
> > > > #include <linux/module.h>
> > > > +#include <linux/config.h>
> > >
> > > Don't add config.h at all.
> > >
> > > > #include <linux/kernel.h>
> > > > #include <linux/sched.h>
> > > > #include <linux/mm.h>
> > >
> > > > @@ -413,7 +416,9 @@
> > > > /****************************************************************************/
> > > >
> > > > static int load_flat_file(struct linux_binprm * bprm,
> > > > - struct lib_info *libinfo, int id, unsigned long *extra_stack)
> > > > + struct lib_info *libinfo, int id,
> > > > + unsigned long *extra_stack,
> > > > + unsigned long *stack_base)
> > > > {
> > > > struct flat_hdr * hdr;
> > > > unsigned long textpos = 0, datapos = 0, result;
> > > > @@ -426,7 +431,6 @@
> > > > int i, rev, relocs = 0;
> > > > loff_t fpos;
> > > > unsigned long start_code, end_code;
> > > > - int ret;
> > > >
> > > > hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */
> > > > inode = bprm->file->f_dentry->d_inode;
> > > > @@ -451,25 +455,24 @@
> > > > */
> > > > if (strncmp(hdr->magic, "#!", 2))
> > > > printk("BINFMT_FLAT: bad header magic\n");
> > > > - ret = -ENOEXEC;
> > > > - goto err;
> > > > + return -ENOEXEC;
> > >
> > > Some of us actually prefer to have one exit path per function,
> > > not multiple ones. It can help with debugging...
> > >
> > > and it would be Good to describe such a change in the
> > > patch description too, but I'd prefer not to see that
> > > particular change.
> > >
> > >
> > > > }
> > > > -
> > > > +#ifdef DEBUG
> > > > + flags |= FLAT_FLAG_KTRACE;
> > > > +#endif
> > > > if (flags & FLAT_FLAG_KTRACE)
> > > > printk("BINFMT_FLAT: 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%x and
> > > > 0x%x)\n", rev, FLAT_VERSION, OLD_FLAT_VERSION);
> > > > - ret = -ENOEXEC;
> > > > - goto err;
> > > > + return -ENOEXEC;
> > > > }
> > > > -
> > > > +
> > > > /* 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);
> > > > - ret = -ENOEXEC;
> > > > - goto err;
> > > > + return -ENOEXEC;
> > > > }
> > > >
> > > > /*
> > > > @@ -482,8 +485,7 @@
> > > > #ifndef CONFIG_BINFMT_ZFLAT
> > > > if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
> > > > printk("Support for ZFLAT executables is not enabled.\n");
> > > > - ret = -ENOEXEC;
> > > > - goto err;
> > > > + return -ENOEXEC;
> > > > }
> > > > #endif
> > > >
> > > > @@ -495,18 +497,27 @@
> > > > rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur;
> > > > if (rlim >= RLIM_INFINITY)
> > > > rlim = ~0;
> > > > - if (data_len + bss_len > rlim) {
> > > > - ret = -ENOMEM;
> > > > - goto err;
> > > > + if (data_len + bss_len > rlim)
> > > > + return -ENOMEM;
> > > > +
> > > > + if (flags & FLAT_FLAG_L1STK) {
> > > > + if (stack_base == 0) {
> > > > + printk ("BINFMT_FLAT: requesting L1 stack for shared library\n");
> > >
> > > No space between printk and '('.
> > > Use a printk level, like KERN_DEBUG (or drop this printk call
> > > completely :).
> > >
> > > > + return -ENOEXEC;
> > > > + }
> > >
> > > ---
> > > ~Randy
> > >
> >
> >
> > --
> > Best regards,
> > Luke Yang
> > luke.adi@...il.com
> >
>
>
> --
> Best regards,
> Luke Yang
> luke.adi@...il.com
> -
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>
---
~Randy
-
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