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| author | Serge Hallyn <serue@us.ibm.com> | 2008-10-30 11:52:23 -0500 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-11-01 09:49:45 -0700 |
| commit | 3318a386e4ca68c76e0294363d29bdc46fcad670 (patch) | |
| tree | da0da58f10bcb7dd7a885f6032b46d1025af208b | |
| parent | e06f42d6c127883e58b747048752f44ae208ae47 (diff) | |
| download | linux-3318a386e4ca68c76e0294363d29bdc46fcad670.tar.gz linux-3318a386e4ca68c76e0294363d29bdc46fcad670.tar.bz2 linux-3318a386e4ca68c76e0294363d29bdc46fcad670.zip | |
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>
| -rw-r--r-- | security/commoncap.c | 6 |
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; |