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| author | Pavel Emelyanov <xemul@openvz.org> | 2008-08-20 14:09:10 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-08-20 15:40:31 -0700 |
| commit | ff9bc512f198eb47204f55b24c6fe3d36ed89592 (patch) | |
| tree | e55d1639a5a3f8c0ef1827fae4ff8529d4ffef04 | |
| parent | c82f2966015a2c9708fb8f20694ef7ba8567d2e1 (diff) | |
| download | kernel-crypto-ff9bc512f198eb47204f55b24c6fe3d36ed89592.tar.gz kernel-crypto-ff9bc512f198eb47204f55b24c6fe3d36ed89592.tar.xz kernel-crypto-ff9bc512f198eb47204f55b24c6fe3d36ed89592.zip | |
binfmt_misc: fix false -ENOEXEC when coupled with other binary handlers
In case the binfmt_misc binary handler is registered *before* the e.g.
script one (when for example being compiled as a module) the following
situation may occur:
1. user launches a script, whose interpreter is a misc binary;
2. the load_misc_binary sets the misc_bang and returns -ENOEVEC,
since the binary is a script;
3. the load_script_binary loads one and calls for search_binary_hander
to run the interpreter;
4. the load_misc_binary is called again, but refuses to load the
binary due to misc_bang bit set.
The fix is to move the misc_bang setting lower - prior to the actual
call to the search_binary_handler.
Caused by the commit 3a2e7f47 (binfmt_misc.c: avoid potential kernel
stack overflow)
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Reported-by: Kirill A. Shutemov <kirill@shutemov.name>
Tested-by: Kirill A. Shutemov <kirill@shutemov.name>
Cc: <stable@kernel.org> [2.6.26.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/binfmt_misc.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c index 756205314c2..8d7e88e02e0 100644 --- a/fs/binfmt_misc.c +++ b/fs/binfmt_misc.c @@ -120,8 +120,6 @@ static int load_misc_binary(struct linux_binprm *bprm, struct pt_regs *regs) 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); @@ -199,6 +197,8 @@ static int load_misc_binary(struct linux_binprm *bprm, struct pt_regs *regs) if (retval < 0) goto _error; + bprm->misc_bang = 1; + retval = search_binary_handler (bprm, regs); if (retval < 0) goto _error; |