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authorAl Viro <viro@zeniv.linux.org.uk>2008-04-22 05:11:59 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2008-04-25 09:23:53 -0400
commitfd8328be874f4190a811c58cd4778ec2c74d2c05 (patch)
treeb44ae8e99ce96a1a4739b04d4d1a23c40ab8b163 /fs/binfmt_elf.c
parent6b335d9c80d7f3c2a3f6545f664ae9007a0f3821 (diff)
downloadconfigs-fd8328be874f4190a811c58cd4778ec2c74d2c05.tar.gz
[PATCH] sanitize handling of shared descriptor tables in failing execve()
* unshare_files() can fail; doing it after irreversible actions is wrong and de_thread() is certainly irreversible. * since we do it unconditionally anyway, we might as well do it in do_execve() and save ourselves the PITA in binfmt handlers, etc. * while we are at it, binfmt_som actually leaked files_struct on failure. As a side benefit, unshare_files(), put_files_struct() and reset_files_struct() become unexported. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/binfmt_elf.c')
-rw-r--r--fs/binfmt_elf.c23
1 files changed, 1 insertions, 22 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 5e1a4fb5cac..9924581df6f 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -543,7 +543,6 @@ static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs)
unsigned long interp_load_addr = 0;
unsigned long start_code, end_code, start_data, end_data;
unsigned long reloc_func_desc = 0;
- struct files_struct *files;
int executable_stack = EXSTACK_DEFAULT;
unsigned long def_flags = 0;
struct {
@@ -593,20 +592,9 @@ static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs)
goto out_free_ph;
}
- files = current->files; /* Refcounted so ok */
- retval = unshare_files();
- if (retval < 0)
- goto out_free_ph;
- if (files == current->files) {
- put_files_struct(files);
- files = NULL;
- }
-
- /* exec will make our files private anyway, but for the a.out
- loader stuff we need to do it earlier */
retval = get_unused_fd();
if (retval < 0)
- goto out_free_fh;
+ goto out_free_ph;
get_file(bprm->file);
fd_install(elf_exec_fileno = retval, bprm->file);
@@ -728,12 +716,6 @@ static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs)
if (retval)
goto out_free_dentry;
- /* Discard our unneeded old files struct */
- if (files) {
- put_files_struct(files);
- files = NULL;
- }
-
/* OK, This is the point of no return */
current->flags &= ~PF_FORKNOEXEC;
current->mm->def_flags = def_flags;
@@ -1016,9 +998,6 @@ out_free_interp:
kfree(elf_interpreter);
out_free_file:
sys_close(elf_exec_fileno);
-out_free_fh:
- if (files)
- reset_files_struct(current, files);
out_free_ph:
kfree(elf_phdata);
goto out;