X-Git-Url: http://pileus.org/git/?a=blobdiff_plain;f=fs%2Fbinfmt_aout.c;h=517e111bb7ef4acbb94f95fb560cb4c2734f4d5b;hb=cfe14677f286c9be5d683b88214def8f4b8a6f24;hp=72011826f0cb340aabc54f65ee7d31653fc7d364;hpb=fce45c1c8a6b5334fa88bbb9b1496b0699d3fef0;p=~andy%2Flinux

diff --git a/fs/binfmt_aout.c b/fs/binfmt_aout.c
index 72011826f0c..517e111bb7e 100644
--- a/fs/binfmt_aout.c
+++ b/fs/binfmt_aout.c
@@ -33,8 +33,6 @@ static int load_aout_binary(struct linux_binprm *, struct pt_regs * regs);
 static int load_aout_library(struct file*);
 static int aout_core_dump(long signr, struct pt_regs * regs, struct file *file);
 
-extern void dump_thread(struct pt_regs *, struct user *);
-
 static struct linux_binfmt aout_format = {
 	.module		= THIS_MODULE,
 	.load_binary	= load_aout_binary,
@@ -280,6 +278,13 @@ static int load_aout_binary(struct linux_binprm * bprm, struct pt_regs * regs)
 		return -ENOEXEC;
 	}
 
+	/*
+	 * Requires a mmap handler. This prevents people from using a.out
+	 * as part of an exploit attack against /proc-related vulnerabilities.
+	 */
+	if (!bprm->file->f_op || !bprm->file->f_op->mmap)
+		return -ENOEXEC;
+
 	fd_offset = N_TXTOFF(ex);
 
 	/* Check initial limits. This avoids letting people circumvent
@@ -478,6 +483,13 @@ static int load_aout_library(struct file *file)
 		goto out;
 	}
 
+	/*
+	 * Requires a mmap handler. This prevents people from using a.out
+	 * as part of an exploit attack against /proc-related vulnerabilities.
+	 */
+	if (!file->f_op || !file->f_op->mmap)
+		goto out;
+
 	if (N_FLAGS(ex))
 		goto out;