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authorAlexey Dobriyan <adobriyan@gmail.com>2006-12-06 20:40:39 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-07 08:39:46 -0800
commit6d4df677f8a60ea6bc0ef1a596c1a3a79b1d4882 (patch)
tree289572805ebba72be476af5d1b89fef32070114d
parent7d1362c0d05b8543807ab403ac8ce813cab41fa4 (diff)
[PATCH] do_coredump() and not stopping rewrite attacks?
On Sat, Dec 02, 2006 at 11:47:44PM +0300, Alexey Dobriyan wrote: > David Binderman compiled 2.6.19 with icc and grepped for "was set but never > used". Many warnings are on > http://coderock.org/kj/unused-2.6.19-fs Heh, the very first line: fs/exec.c(1465): remark #593: variable "flag" was set but never used fs/exec.c: 1477 /* 1478 * We cannot trust fsuid as being the "true" uid of the 1479 * process nor do we know its entire history. We only know it 1480 * was tainted so we dump it as root in mode 2. 1481 */ 1482 if (mm->dumpable == 2) { /* Setuid core dump mode */ 1483 flag = O_EXCL; /* Stop rewrite attacks */ 1484 current->fsuid = 0; /* Dump root private */ 1485 } And then filp_open follows with "flag" totally ignored. (akpm: this restores the code to Alan's original version. Andi's "Support piping into commands in /proc/sys/kernel/core_pattern" (cset d025c9db) broke it). Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: <stable@kerenl.org> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--fs/exec.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/exec.c b/fs/exec.c
index 2092bd207463..add0e03c3ea9 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1515,7 +1515,8 @@ int do_coredump(long signr, int exit_code, struct pt_regs * regs)
ispipe = 1;
} else
file = filp_open(corename,
- O_CREAT | 2 | O_NOFOLLOW | O_LARGEFILE, 0600);
+ O_CREAT | 2 | O_NOFOLLOW | O_LARGEFILE | flag,
+ 0600);
if (IS_ERR(file))
goto fail_unlock;
inode = file->f_dentry->d_inode;