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Diffstat (limited to 'fs')
-rw-r--r--fs/exec.c16
-rw-r--r--fs/fuse/file.c12
-rw-r--r--fs/internal.h6
-rw-r--r--fs/read_write.c24
-rw-r--r--fs/splice.c32
5 files changed, 58 insertions, 32 deletions
diff --git a/fs/exec.c b/fs/exec.c
index 64301958557..ffd7a813ad3 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1135,13 +1135,6 @@ void setup_new_exec(struct linux_binprm * bprm)
set_dumpable(current->mm, suid_dumpable);
}
- /*
- * Flush performance counters when crossing a
- * security domain:
- */
- if (!get_dumpable(current->mm))
- perf_event_exit_task(current);
-
/* An exec changes our domain. We are no longer part of the thread
group */
@@ -1205,6 +1198,15 @@ void install_exec_creds(struct linux_binprm *bprm)
commit_creds(bprm->cred);
bprm->cred = NULL;
+
+ /*
+ * Disable monitoring for regular users
+ * when executing setuid binaries. Must
+ * wait until new credentials are committed
+ * by commit_creds() above
+ */
+ if (get_dumpable(current->mm) != SUID_DUMP_USER)
+ perf_event_exit_task(current);
/*
* cred_guard_mutex must be held at least to this point to prevent
* ptrace_attach() from altering our determination of the task's
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index e570081f9f7..35f28103314 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -2470,13 +2470,16 @@ static long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
.mode = mode
};
int err;
+ bool lock_inode = !(mode & FALLOC_FL_KEEP_SIZE) ||
+ (mode & FALLOC_FL_PUNCH_HOLE);
if (fc->no_fallocate)
return -EOPNOTSUPP;
- if (mode & FALLOC_FL_PUNCH_HOLE) {
+ if (lock_inode) {
mutex_lock(&inode->i_mutex);
- fuse_set_nowrite(inode);
+ if (mode & FALLOC_FL_PUNCH_HOLE)
+ fuse_set_nowrite(inode);
}
req = fuse_get_req_nopages(fc);
@@ -2511,8 +2514,9 @@ static long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
fuse_invalidate_attr(inode);
out:
- if (mode & FALLOC_FL_PUNCH_HOLE) {
- fuse_release_nowrite(inode);
+ if (lock_inode) {
+ if (mode & FALLOC_FL_PUNCH_HOLE)
+ fuse_release_nowrite(inode);
mutex_unlock(&inode->i_mutex);
}
diff --git a/fs/internal.h b/fs/internal.h
index eaa75f75b62..68121584ae3 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -132,6 +132,12 @@ extern struct dentry *__d_alloc(struct super_block *, const struct qstr *);
extern ssize_t __kernel_write(struct file *, const char *, size_t, loff_t *);
/*
+ * splice.c
+ */
+extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
+ loff_t *opos, size_t len, unsigned int flags);
+
+/*
* pipe.c
*/
extern const struct file_operations pipefifo_fops;
diff --git a/fs/read_write.c b/fs/read_write.c
index 03430008704..2cefa417be3 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1064,6 +1064,7 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
struct fd in, out;
struct inode *in_inode, *out_inode;
loff_t pos;
+ loff_t out_pos;
ssize_t retval;
int fl;
@@ -1077,12 +1078,14 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
if (!(in.file->f_mode & FMODE_READ))
goto fput_in;
retval = -ESPIPE;
- if (!ppos)
- ppos = &in.file->f_pos;
- else
+ if (!ppos) {
+ pos = in.file->f_pos;
+ } else {
+ pos = *ppos;
if (!(in.file->f_mode & FMODE_PREAD))
goto fput_in;
- retval = rw_verify_area(READ, in.file, ppos, count);
+ }
+ retval = rw_verify_area(READ, in.file, &pos, count);
if (retval < 0)
goto fput_in;
count = retval;
@@ -1099,7 +1102,8 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
retval = -EINVAL;
in_inode = file_inode(in.file);
out_inode = file_inode(out.file);
- retval = rw_verify_area(WRITE, out.file, &out.file->f_pos, count);
+ out_pos = out.file->f_pos;
+ retval = rw_verify_area(WRITE, out.file, &out_pos, count);
if (retval < 0)
goto fput_out;
count = retval;
@@ -1107,7 +1111,6 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
if (!max)
max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes);
- pos = *ppos;
if (unlikely(pos + count > max)) {
retval = -EOVERFLOW;
if (pos >= max)
@@ -1126,18 +1129,23 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
if (in.file->f_flags & O_NONBLOCK)
fl = SPLICE_F_NONBLOCK;
#endif
- retval = do_splice_direct(in.file, ppos, out.file, count, fl);
+ retval = do_splice_direct(in.file, &pos, out.file, &out_pos, count, fl);
if (retval > 0) {
add_rchar(current, retval);
add_wchar(current, retval);
fsnotify_access(in.file);
fsnotify_modify(out.file);
+ out.file->f_pos = out_pos;
+ if (ppos)
+ *ppos = pos;
+ else
+ in.file->f_pos = pos;
}
inc_syscr(current);
inc_syscw(current);
- if (*ppos > max)
+ if (pos > max)
retval = -EOVERFLOW;
fput_out:
diff --git a/fs/splice.c b/fs/splice.c
index e6b25598c8c..d37431dd60a 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1274,7 +1274,7 @@ static int direct_splice_actor(struct pipe_inode_info *pipe,
{
struct file *file = sd->u.file;
- return do_splice_from(pipe, file, &file->f_pos, sd->total_len,
+ return do_splice_from(pipe, file, sd->opos, sd->total_len,
sd->flags);
}
@@ -1283,6 +1283,7 @@ static int direct_splice_actor(struct pipe_inode_info *pipe,
* @in: file to splice from
* @ppos: input file offset
* @out: file to splice to
+ * @opos: output file offset
* @len: number of bytes to splice
* @flags: splice modifier flags
*
@@ -1294,7 +1295,7 @@ static int direct_splice_actor(struct pipe_inode_info *pipe,
*
*/
long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
- size_t len, unsigned int flags)
+ loff_t *opos, size_t len, unsigned int flags)
{
struct splice_desc sd = {
.len = len,
@@ -1302,6 +1303,7 @@ long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
.flags = flags,
.pos = *ppos,
.u.file = out,
+ .opos = opos,
};
long ret;
@@ -1325,7 +1327,7 @@ static long do_splice(struct file *in, loff_t __user *off_in,
{
struct pipe_inode_info *ipipe;
struct pipe_inode_info *opipe;
- loff_t offset, *off;
+ loff_t offset;
long ret;
ipipe = get_pipe_info(in);
@@ -1356,13 +1358,15 @@ static long do_splice(struct file *in, loff_t __user *off_in,
return -EINVAL;
if (copy_from_user(&offset, off_out, sizeof(loff_t)))
return -EFAULT;
- off = &offset;
- } else
- off = &out->f_pos;
+ } else {
+ offset = out->f_pos;
+ }
- ret = do_splice_from(ipipe, out, off, len, flags);
+ ret = do_splice_from(ipipe, out, &offset, len, flags);
- if (off_out && copy_to_user(off_out, off, sizeof(loff_t)))
+ if (!off_out)
+ out->f_pos = offset;
+ else if (copy_to_user(off_out, &offset, sizeof(loff_t)))
ret = -EFAULT;
return ret;
@@ -1376,13 +1380,15 @@ static long do_splice(struct file *in, loff_t __user *off_in,
return -EINVAL;
if (copy_from_user(&offset, off_in, sizeof(loff_t)))
return -EFAULT;
- off = &offset;
- } else
- off = &in->f_pos;
+ } else {
+ offset = in->f_pos;
+ }
- ret = do_splice_to(in, off, opipe, len, flags);
+ ret = do_splice_to(in, &offset, opipe, len, flags);
- if (off_in && copy_to_user(off_in, off, sizeof(loff_t)))
+ if (!off_in)
+ in->f_pos = offset;
+ else if (copy_to_user(off_in, &offset, sizeof(loff_t)))
ret = -EFAULT;
return ret;
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-01 01:41:46 +0000