Messages in this thread Patch in this message | | | Date | Tue, 14 Dec 2010 15:43:44 +0530 | From | "Suzuki K. Poulose" <> | Subject | [Patch 12/21] Check if the process is an ELF executable |
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Validate if the process is an ELF exec. This will be later extended to identify if the task is a native ELF or a compat ELF.
Signed-off-by: Suzuki K. Poulose <suzuki@in.ibm.com> --- fs/proc/gencore.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+)
Index: linux-2.6.36-rc7/fs/proc/gencore.c =================================================================== --- linux-2.6.36-rc7.orig/fs/proc/gencore.c +++ linux-2.6.36-rc7/fs/proc/gencore.c @@ -23,6 +23,8 @@ */ #include <linux/seq_file.h> +#include <linux/elf.h> + #include "internal.h" #include "gencore.h" @@ -85,6 +87,30 @@ static int release_gencore(struct inode } /* + * Determine whether the task is an ELF executable. + * Returns + * < 0 - Non-ELF + * 0 - Native ELF Executable + */ +static int get_elf_class(struct task_struct *task) +{ + struct elfhdr hdr; + int ret = 0; + + ret = kernel_read(task->mm->exe_file, 0, (char*)&hdr, sizeof(hdr)); + if (ret < 0) + return ret; + + /* Verify the ELF magic on the exe_file */ + if (memcmp(hdr.e_ident, ELFMAG, SELFMAG)) + return -EINVAL; + if (elf_check_arch(&hdr)) + return 0; + + return -EINVAL; +} + +/* * Validate if the call is valid. We also need to prevent >1 open * of the same file. */ @@ -93,10 +119,15 @@ static int open_gencore(struct inode *in struct task_struct *task = get_proc_task(inode); struct core_proc *cp; int ret = 0; + int elf_class; if (!task) return -ENOENT; + elf_class = get_elf_class(task); + if (elf_class < 0) + return elf_class; + mutex_lock(&core_mutex); cp = get_core_proc(task); if (cp) {
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