Messages in this thread Patch in this message | | | Date | Fri, 16 Feb 2007 22:40:31 +0900 | From | "Kawai, Hidehiro" <> | Subject | [PATCH 2/4] coredump: ELF: enable to omit anonymous shared memory |
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This patch enables to omit anonymous shared memory from an ELF formatted core file when it is generated.
Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> --- fs/binfmt_elf.c | 20 ++++++++++++++------ 1 files changed, 14 insertions(+), 6 deletions(-)
Index: linux-2.6.20-mm1/fs/binfmt_elf.c =================================================================== --- linux-2.6.20-mm1.orig/fs/binfmt_elf.c +++ linux-2.6.20-mm1/fs/binfmt_elf.c @@ -1181,7 +1181,7 @@ static int dump_seek(struct file *file, * * I think we should skip something. But I am not sure how. H.J. */ -static int maydump(struct vm_area_struct *vma) +static int maydump(struct vm_area_struct *vma, unsigned int omit_anon_shared) { /* The vma can be set up to tell us the answer directly. */ if (vma->vm_flags & VM_ALWAYSDUMP) @@ -1191,9 +1191,15 @@ static int maydump(struct vm_area_struct if (vma->vm_flags & (VM_IO | VM_RESERVED)) return 0; - /* Dump shared memory only if mapped from an anonymous file. */ - if (vma->vm_flags & VM_SHARED) - return vma->vm_file->f_path.dentry->d_inode->i_nlink == 0; + /* + * Dump shared memory only if mapped from an anonymous file and + * /proc/<pid>/coredump_omit_anonymous_shared flag is not set. + */ + if (vma->vm_flags & VM_SHARED) { + if (vma->vm_file->f_path.dentry->d_inode->i_nlink) + return 0; + return omit_anon_shared == 0; + } /* If it hasn't been written to, don't write it out */ if (!vma->anon_vma) @@ -1491,6 +1497,7 @@ static int elf_core_dump(long signr, str #endif int thread_status_size = 0; elf_addr_t *auxv; + unsigned int omit_anon_shared = 0; /* * We no longer stop all VM operations. @@ -1629,6 +1636,7 @@ static int elf_core_dump(long signr, str } dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); + omit_anon_shared = current->mm->coredump_omit_anon_shared; /* Write program headers for segments dump */ for (vma = first_vma(current, gate_vma); vma != NULL; @@ -1642,7 +1650,7 @@ static int elf_core_dump(long signr, str phdr.p_offset = offset; phdr.p_vaddr = vma->vm_start; phdr.p_paddr = 0; - phdr.p_filesz = maydump(vma) ? sz : 0; + phdr.p_filesz = maydump(vma, omit_anon_shared) ? sz : 0; phdr.p_memsz = sz; offset += phdr.p_filesz; phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; @@ -1685,7 +1693,7 @@ static int elf_core_dump(long signr, str vma = next_vma(vma, gate_vma)) { unsigned long addr; - if (!maydump(vma)) + if (!maydump(vma, omit_anon_shared)) continue; for (addr = vma->vm_start;
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