From: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com> To: vgoyal@redhat.com, ebiederm@xmission.com, cpw@sgi.com, kumagai-atsushi@mxc.nes.nec.co.jp, lisa.mitchell@hp.com, heiko.carstens@de.ibm.com, akpm@linux-foundation.org Cc: kexec@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 16/20] vmcore: check NT_VMCORE_PAD as a mark indicating the end of ELF note buffer Date: Sat, 02 Mar 2013 17:37:20 +0900 [thread overview] Message-ID: <20130302083720.31252.92900.stgit@localhost6.localdomain6> (raw) In-Reply-To: <20130302083447.31252.93914.stgit@localhost6.localdomain6> Modern kernel marks the end of ELF note buffer with NT_VMCORE_PAD type note in order to make the buffer satisfy mmap()'s page-size boundary requirement. This patch makes finishing reading each buffer if the note type now being read is NT_VMCORE_PAD type. Signed-off-by: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com> --- fs/proc/vmcore.c | 24 ++++++++++++++++++++++++ 1 files changed, 24 insertions(+), 0 deletions(-) diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c index c8899dc..e432946 100644 --- a/fs/proc/vmcore.c +++ b/fs/proc/vmcore.c @@ -259,12 +259,24 @@ static int __init merge_note_headers_elf64(char *elfptr, size_t *elfsz, } nhdr_ptr = notes_section; for (j = 0; j < max_sz; j += sz) { + char *name; + + /* Old kernel marks the end of ELF note buffer + * with empty header. */ if (nhdr_ptr->n_namesz == 0) break; sz = sizeof(Elf64_Nhdr) + ((nhdr_ptr->n_namesz + 3) & ~3) + ((nhdr_ptr->n_descsz + 3) & ~3); real_sz += sz; + + /* Modern kernel marks the end of ELF note + * buffer with NT_VMCORE_PAD type note. */ + name = (char *)(nhdr_ptr + 1); + if (strncmp(name, VMCOREINFO_NOTE_NAME, + sizeof(VMCOREINFO_NOTE_NAME)) == 0 + && nhdr_ptr->n_type == NT_VMCORE_PAD) + break; nhdr_ptr = (Elf64_Nhdr*)((char*)nhdr_ptr + sz); } @@ -369,12 +381,24 @@ static int __init merge_note_headers_elf32(char *elfptr, size_t *elfsz, } nhdr_ptr = notes_section; for (j = 0; j < max_sz; j += sz) { + char *name; + + /* Old kernel marks the end of ELF note buffer + * with empty header. */ if (nhdr_ptr->n_namesz == 0) break; sz = sizeof(Elf32_Nhdr) + ((nhdr_ptr->n_namesz + 3) & ~3) + ((nhdr_ptr->n_descsz + 3) & ~3); real_sz += sz; + + /* Modern kernel marks the end of ELF note + * buffer with NT_VMCORE_PAD type note. */ + name = (char *)(nhdr_ptr + 1); + if (strncmp(name, VMCOREINFO_NOTE_NAME, + sizeof(VMCOREINFO_NOTE_NAME)) == 0 + && nhdr_ptr->n_type == NT_VMCORE_PAD) + break; nhdr_ptr = (Elf32_Nhdr*)((char*)nhdr_ptr + sz); }
WARNING: multiple messages have this Message-ID (diff)
From: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com> To: vgoyal@redhat.com, ebiederm@xmission.com, cpw@sgi.com, kumagai-atsushi@mxc.nes.nec.co.jp, lisa.mitchell@hp.com, heiko.carstens@de.ibm.com, akpm@linux-foundation.org Cc: kexec@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 16/20] vmcore: check NT_VMCORE_PAD as a mark indicating the end of ELF note buffer Date: Sat, 02 Mar 2013 17:37:20 +0900 [thread overview] Message-ID: <20130302083720.31252.92900.stgit@localhost6.localdomain6> (raw) In-Reply-To: <20130302083447.31252.93914.stgit@localhost6.localdomain6> Modern kernel marks the end of ELF note buffer with NT_VMCORE_PAD type note in order to make the buffer satisfy mmap()'s page-size boundary requirement. This patch makes finishing reading each buffer if the note type now being read is NT_VMCORE_PAD type. Signed-off-by: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com> --- fs/proc/vmcore.c | 24 ++++++++++++++++++++++++ 1 files changed, 24 insertions(+), 0 deletions(-) diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c index c8899dc..e432946 100644 --- a/fs/proc/vmcore.c +++ b/fs/proc/vmcore.c @@ -259,12 +259,24 @@ static int __init merge_note_headers_elf64(char *elfptr, size_t *elfsz, } nhdr_ptr = notes_section; for (j = 0; j < max_sz; j += sz) { + char *name; + + /* Old kernel marks the end of ELF note buffer + * with empty header. */ if (nhdr_ptr->n_namesz == 0) break; sz = sizeof(Elf64_Nhdr) + ((nhdr_ptr->n_namesz + 3) & ~3) + ((nhdr_ptr->n_descsz + 3) & ~3); real_sz += sz; + + /* Modern kernel marks the end of ELF note + * buffer with NT_VMCORE_PAD type note. */ + name = (char *)(nhdr_ptr + 1); + if (strncmp(name, VMCOREINFO_NOTE_NAME, + sizeof(VMCOREINFO_NOTE_NAME)) == 0 + && nhdr_ptr->n_type == NT_VMCORE_PAD) + break; nhdr_ptr = (Elf64_Nhdr*)((char*)nhdr_ptr + sz); } @@ -369,12 +381,24 @@ static int __init merge_note_headers_elf32(char *elfptr, size_t *elfsz, } nhdr_ptr = notes_section; for (j = 0; j < max_sz; j += sz) { + char *name; + + /* Old kernel marks the end of ELF note buffer + * with empty header. */ if (nhdr_ptr->n_namesz == 0) break; sz = sizeof(Elf32_Nhdr) + ((nhdr_ptr->n_namesz + 3) & ~3) + ((nhdr_ptr->n_descsz + 3) & ~3); real_sz += sz; + + /* Modern kernel marks the end of ELF note + * buffer with NT_VMCORE_PAD type note. */ + name = (char *)(nhdr_ptr + 1); + if (strncmp(name, VMCOREINFO_NOTE_NAME, + sizeof(VMCOREINFO_NOTE_NAME)) == 0 + && nhdr_ptr->n_type == NT_VMCORE_PAD) + break; nhdr_ptr = (Elf32_Nhdr*)((char*)nhdr_ptr + sz); } _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec
next prev parent reply other threads:[~2013-03-05 7:06 UTC|newest] Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-03-02 8:35 [PATCH v2 00/20] kdump, vmcore: support mmap() on /proc/vmcore HATAYAMA Daisuke 2013-03-02 8:35 ` HATAYAMA Daisuke 2013-03-02 8:35 ` [PATCH v2 01/20] vmcore: refer to e_phoff member explicitly HATAYAMA Daisuke 2013-03-02 8:35 ` HATAYAMA Daisuke 2013-03-05 7:35 ` Zhang Yanfei 2013-03-05 7:35 ` Zhang Yanfei 2013-03-10 6:46 ` Zhang Yanfei 2013-03-10 6:46 ` Zhang Yanfei 2013-03-11 0:31 ` HATAYAMA Daisuke 2013-03-11 0:31 ` HATAYAMA Daisuke 2013-03-11 17:36 ` Vivek Goyal 2013-03-11 17:36 ` Vivek Goyal 2013-03-02 8:35 ` [PATCH v2 02/20] vmcore: rearrange program headers without assuming consequtive PT_NOTE entries HATAYAMA Daisuke 2013-03-02 8:35 ` HATAYAMA Daisuke 2013-03-05 8:36 ` Zhang Yanfei 2013-03-05 8:36 ` Zhang Yanfei 2013-03-05 9:02 ` HATAYAMA Daisuke 2013-03-05 9:02 ` HATAYAMA Daisuke 2013-03-05 9:35 ` Zhang Yanfei 2013-03-05 9:35 ` Zhang Yanfei 2013-03-02 8:36 ` [PATCH v2 03/20] vmcore, sysfs: export ELF note segment size instead of vmcoreinfo data size HATAYAMA Daisuke 2013-03-02 8:36 ` HATAYAMA Daisuke 2013-03-05 9:29 ` Zhang Yanfei 2013-03-05 9:29 ` Zhang Yanfei 2013-03-06 0:07 ` HATAYAMA Daisuke 2013-03-06 0:07 ` HATAYAMA Daisuke 2013-03-02 8:36 ` [PATCH v2 04/20] vmcore: allocate buffer for ELF headers on page-size alignment HATAYAMA Daisuke 2013-03-02 8:36 ` HATAYAMA Daisuke 2013-03-06 6:57 ` Zhang Yanfei 2013-03-06 6:57 ` Zhang Yanfei 2013-03-06 9:14 ` HATAYAMA Daisuke 2013-03-06 9:14 ` HATAYAMA Daisuke 2013-03-02 8:36 ` [PATCH v2 05/20] vmcore: round up buffer size of ELF headers by PAGE_SIZE HATAYAMA Daisuke 2013-03-02 8:36 ` HATAYAMA Daisuke 2013-03-06 15:51 ` Yanfei Zhang 2013-03-06 15:51 ` Yanfei Zhang 2013-03-02 8:36 ` [PATCH v2 06/20] vmcore, procfs: introduce a flag to distinguish objects copied in 2nd kernel HATAYAMA Daisuke 2013-03-02 8:36 ` HATAYAMA Daisuke 2013-03-06 15:55 ` Yanfei Zhang 2013-03-06 15:55 ` Yanfei Zhang 2013-03-02 8:36 ` [PATCH v2 07/20] vmcore: copy non page-size aligned head and tail pages " HATAYAMA Daisuke 2013-03-02 8:36 ` HATAYAMA Daisuke 2013-03-10 6:16 ` Zhang Yanfei 2013-03-10 6:16 ` Zhang Yanfei 2013-03-11 0:27 ` HATAYAMA Daisuke 2013-03-11 0:27 ` HATAYAMA Daisuke 2013-03-02 8:36 ` [PATCH v2 08/20] vmcore: modify vmcore clean-up function to free buffer on " HATAYAMA Daisuke 2013-03-02 8:36 ` HATAYAMA Daisuke 2013-03-02 8:36 ` [PATCH v2 09/20] vmcore: clean up read_vmcore() HATAYAMA Daisuke 2013-03-02 8:36 ` HATAYAMA Daisuke 2013-03-02 8:36 ` [PATCH v2 10/20] vmcore: read buffers for vmcore objects copied from old memory HATAYAMA Daisuke 2013-03-02 8:36 ` HATAYAMA Daisuke 2013-03-02 8:36 ` [PATCH v2 11/20] vmcore: allocate per-cpu crash_notes objects on page-size boundary HATAYAMA Daisuke 2013-03-02 8:36 ` HATAYAMA Daisuke 2013-03-02 8:36 ` [PATCH v2 12/20] kexec: allocate vmcoreinfo note buffer " HATAYAMA Daisuke 2013-03-02 8:36 ` HATAYAMA Daisuke 2013-03-02 8:37 ` [PATCH v2 13/20] kexec, elf: introduce NT_VMCORE_DEBUGINFO note type HATAYAMA Daisuke 2013-03-02 8:37 ` HATAYAMA Daisuke 2013-03-02 8:37 ` [PATCH v2 14/20] elf: introduce NT_VMCORE_PAD type HATAYAMA Daisuke 2013-03-02 8:37 ` HATAYAMA Daisuke 2013-03-02 8:37 ` [PATCH v2 15/20] kexec: fill note buffers by NT_VMCORE_PAD notes in page-size boundary HATAYAMA Daisuke 2013-03-02 8:37 ` HATAYAMA Daisuke 2013-03-07 10:11 ` Zhang Yanfei 2013-03-07 10:11 ` Zhang Yanfei 2013-03-08 1:55 ` HATAYAMA Daisuke 2013-03-08 1:55 ` HATAYAMA Daisuke 2013-03-08 13:02 ` Yanfei Zhang 2013-03-08 13:02 ` Yanfei Zhang 2013-03-09 3:46 ` HATAYAMA Daisuke 2013-03-09 3:46 ` HATAYAMA Daisuke 2013-03-10 2:33 ` Zhang Yanfei 2013-03-10 2:33 ` Zhang Yanfei 2013-03-02 8:37 ` HATAYAMA Daisuke [this message] 2013-03-02 8:37 ` [PATCH v2 16/20] vmcore: check NT_VMCORE_PAD as a mark indicating the end of ELF note buffer HATAYAMA Daisuke 2013-03-02 8:37 ` [PATCH v2 17/20] vmcore: check if vmcore objects satify mmap()'s page-size boundary requirement HATAYAMA Daisuke 2013-03-02 8:37 ` HATAYAMA Daisuke 2013-03-02 8:37 ` [PATCH v2 18/20] vmcore: round-up offset of vmcore object in page-size boundary HATAYAMA Daisuke 2013-03-02 8:37 ` HATAYAMA Daisuke 2013-03-02 8:37 ` [PATCH v2 19/20] vmcore: count holes generated by round-up operation for vmcore size HATAYAMA Daisuke 2013-03-02 8:37 ` HATAYAMA Daisuke 2013-03-02 8:37 ` [PATCH v2 20/20] vmcore: introduce mmap_vmcore() HATAYAMA Daisuke 2013-03-02 8:37 ` HATAYAMA Daisuke
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