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authorSerge Hallyn <serue@us.ibm.com>2008-10-30 11:52:23 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2008-11-01 09:49:45 -0700
commit3318a386e4ca68c76e0294363d29bdc46fcad670 (patch)
treeda0da58f10bcb7dd7a885f6032b46d1025af208b /security/commoncap.c
parente06f42d6c127883e58b747048752f44ae208ae47 (diff)
downloadlinux-linaro-stable-3318a386e4ca68c76e0294363d29bdc46fcad670.tar.gz
file caps: always start with clear bprm->caps_*
While Linux doesn't honor setuid on scripts. However, it mistakenly behaves differently for file capabilities. This patch fixes that behavior by making sure that get_file_caps() begins with empty bprm->caps_*. That way when a script is loaded, its bprm->caps_* may be filled when binfmt_misc calls prepare_binprm(), but they will be cleared again when binfmt_elf calls prepare_binprm() next to read the interpreter's file capabilities. Signed-off-by: Serge Hallyn <serue@us.ibm.com> Acked-by: David Howells <dhowells@redhat.com> Acked-by: Andrew G. Morgan <morgan@kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'security/commoncap.c')
-rw-r--r--security/commoncap.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/security/commoncap.c b/security/commoncap.c
index 399bfdb9e2da..3976613db829 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -279,10 +279,10 @@ static int get_file_caps(struct linux_binprm *bprm)
struct vfs_cap_data vcaps;
struct inode *inode;
- if (bprm->file->f_vfsmnt->mnt_flags & MNT_NOSUID) {
- bprm_clear_caps(bprm);
+ bprm_clear_caps(bprm);
+
+ if (bprm->file->f_vfsmnt->mnt_flags & MNT_NOSUID)
return 0;
- }
dentry = dget(bprm->file->f_dentry);
inode = dentry->d_inode;