From 3a2e7f47d71e1df86acc1dda6826890b6546a4e1 Mon Sep 17 00:00:00 2001 From: Pavel Emelyanov Date: Tue, 29 Apr 2008 00:59:24 -0700 Subject: binfmt_misc.c: avoid potential kernel stack overflow This can be triggered with root help only, but... Register the ":text:E::txt::/root/cat.txt:' rule in binfmt_misc (by root) and try launching the cat.txt file (by anyone) :) The result is - the endless recursion in the load_misc_binary -> open_exec -> load_misc_binary chain and stack overflow. There's a similar problem with binfmt_script, and there's a sh_bang memner on linux_binprm structure to handle this, but simply raising this in binfmt_misc may break some setups when the interpreter of some misc binaries is a script. So the proposal is to turn sh_bang into a bit, add a new one (the misc_bang) and raise it in load_misc_binary. After this, even if we set up the misc -> script -> misc loop for binfmts one of them will step on its own bang and exit. Signed-off-by: Pavel Emelyanov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/binfmt_em86.c | 2 +- fs/binfmt_misc.c | 6 ++++++ fs/binfmt_script.c | 2 +- 3 files changed, 8 insertions(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/binfmt_em86.c b/fs/binfmt_em86.c index f95ae9789c91..f9c88d0c8ced 100644 --- a/fs/binfmt_em86.c +++ b/fs/binfmt_em86.c @@ -43,7 +43,7 @@ static int load_em86(struct linux_binprm *bprm,struct pt_regs *regs) return -ENOEXEC; } - bprm->sh_bang++; /* Well, the bang-shell is implicit... */ + bprm->sh_bang = 1; /* Well, the bang-shell is implicit... */ allow_write_access(bprm->file); fput(bprm->file); bprm->file = NULL; diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c index dbf0ac0523de..7191306367c5 100644 --- a/fs/binfmt_misc.c +++ b/fs/binfmt_misc.c @@ -115,6 +115,12 @@ static int load_misc_binary(struct linux_binprm *bprm, struct pt_regs *regs) if (!enabled) goto _ret; + retval = -ENOEXEC; + if (bprm->misc_bang) + goto _ret; + + bprm->misc_bang = 1; + /* to keep locking time low, we copy the interpreter string */ read_lock(&entries_lock); fmt = check_file(bprm); diff --git a/fs/binfmt_script.c b/fs/binfmt_script.c index ab33939b12a7..9e3963f7ebf1 100644 --- a/fs/binfmt_script.c +++ b/fs/binfmt_script.c @@ -29,7 +29,7 @@ static int load_script(struct linux_binprm *bprm,struct pt_regs *regs) * Sorta complicated, but hopefully it will work. -TYT */ - bprm->sh_bang++; + bprm->sh_bang = 1; allow_write_access(bprm->file); fput(bprm->file); bprm->file = NULL; -- cgit v1.2.3-59-g8ed1b