From 175a06ae300188af8a61db68a78e1af44dc7d44f Mon Sep 17 00:00:00 2001 From: Tetsuo Handa Date: Tue, 29 Apr 2008 00:59:17 -0700 Subject: [PATCH] exec: remove argv_len from struct linux_binprm I noticed that 2.6.24.2 calculates bprm->argv_len at do_execve(). But it doesn't update bprm->argv_len after "remove_arg_zero() + copy_strings_kernel()" at load_script() etc. audit_bprm() is called from search_binary_handler() and search_binary_handler() is called from load_script() etc. Thus, I think the condition check if (bprm->argv_len > (audit_argv_kb << 10)) return -E2BIG; in audit_bprm() might return wrong result when strlen(removed_arg) != strlen(spliced_args). Why not update bprm->argv_len at load_script() etc. ? By the way, 2.6.25-rc3 seems to not doing the condition check. Is the field bprm->argv_len no longer needed? Signed-off-by: Tetsuo Handa Cc: Ollie Wild Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/exec.c | 3 --- include/linux/binfmts.h | 1 - 2 files changed, 4 deletions(-) diff --git a/fs/exec.c b/fs/exec.c index b152029f18..7768453dc9 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -1268,7 +1268,6 @@ int do_execve(char * filename, { struct linux_binprm *bprm; struct file *file; - unsigned long env_p; struct files_struct *displaced; int retval; @@ -1321,11 +1320,9 @@ int do_execve(char * filename, if (retval < 0) goto out; - env_p = bprm->p; retval = copy_strings(bprm->argc, argv, bprm); if (retval < 0) goto out; - bprm->argv_len = env_p - bprm->p; retval = search_binary_handler(bprm,regs); if (retval >= 0) { diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h index b7fc55ec8d..1dd756731c 100644 --- a/include/linux/binfmts.h +++ b/include/linux/binfmts.h @@ -48,7 +48,6 @@ struct linux_binprm{ unsigned interp_flags; unsigned interp_data; unsigned long loader, exec; - unsigned long argv_len; }; #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0 -- 2.39.5