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Add write-permission check in pfs_write and pfs_ftruncate (#326) 

Write and truncate operations tested, work correctly
This commit is contained in:
Levi Neely 2026-03-03 16:05:28 +01:00 committed by GitHub
parent c03a37527f
commit 07cbef9b88
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GPG Key ID: B5690EEEBB952194
2 changed files with 14 additions and 0 deletions
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13
pclsync/pfs.c
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@ -1324,6 +1324,7 @@ static int pfs_open(const char *path, struct fuse_file_info *fi) {
of = pfs_create_file(fileid, 0, 0, 0, 1, writeid,
pfs_task_get_ref_locked(folder),
fpath->name, encoder);
of->canmodify = (fpath->permissions & PSYNC_PERM_MODIFY) != 0;
pfs_task_release_folder_tasks_locked(folder);
psql_unlock();
pdbg_logf(D_NOTICE, "opening new file %ld %s", (long)fileid, fpath->name);
@ -1378,6 +1379,7 @@ static int pfs_open(const char *path, struct fuse_file_info *fi) {
of = pfs_create_file(cr->fileid, fileid, size, hash, 1, writeid,
pfs_task_get_ref_locked(folder),
fpath->name, encoder);
of->canmodify = (fpath->permissions & PSYNC_PERM_MODIFY) != 0;
pfs_task_release_folder_tasks_locked(folder);
psql_unlock();
free(fpath);
@ -1401,6 +1403,7 @@ static int pfs_open(const char *path, struct fuse_file_info *fi) {
lc->datalen, 0, 1, 0,
pfs_task_get_ref_locked(folder),
fpath->name, PSYNC_CRYPTO_INVALID_ENCODER);
of->canmodify = (fpath->permissions & PSYNC_PERM_MODIFY) != 0;
pfs_task_release_folder_tasks_locked(folder);
psql_unlock();
free(fpath);
@ -1481,6 +1484,7 @@ static int pfs_open(const char *path, struct fuse_file_info *fi) {
of = pfs_create_file(cr->fileid, 0, 0, 0, 1, 0,
pfs_task_get_ref_locked(folder), fpath->name,
encoder);
of->canmodify = (fpath->permissions & PSYNC_PERM_MODIFY) != 0;
pfs_task_release_folder_tasks_locked(folder);
psql_unlock();
of->newfile = 1;
@ -1506,6 +1510,7 @@ static int pfs_open(const char *path, struct fuse_file_info *fi) {
of = pfs_create_file(fileid, fileid, size, hash, 0, 0,
pfs_task_get_ref_locked(folder), fpath->name,
encoder);
of->canmodify = (fpath->permissions & PSYNC_PERM_MODIFY) != 0;
of->origctime = ctime;
fi->fh = openfile_to_fh(of);
ret = 0;
@ -2452,6 +2457,10 @@ static int pfs_write(const char *path, const char *buf, size_t size,
// (unsigned long)offset);
of = fh_to_openfile(fi->fh);
pfs_lock_file(of);
if (!of->canmodify) {
pthread_mutex_unlock(&of->mutex);
return -EACCES;
}
ret = pfs_check_write_space(of, size, offset);
if (pdbg_unlikely(ret <= 0))
return ret;
@ -3238,6 +3247,10 @@ static int pfs_ftruncate(const char *path, fuse_off_t size,
pdbg_logf(D_NOTICE, "ftruncate %s %lu", path, (unsigned long)size);
of = fh_to_openfile(fi->fh);
pfs_lock_file(of);
if (!of->canmodify) {
pthread_mutex_unlock(&of->mutex);
return -EACCES;
}
ret = pfs_ftruncate_of_locked(of, size);
pthread_mutex_unlock(&of->mutex);
return pdbg_returnf(ret, " for ftruncate of %s to %lu", path,

1
pclsync/pfs.h
View File

@ -108,6 +108,7 @@ typedef struct {
unsigned char encrypted;
unsigned char throttle;
unsigned char staticfile;
unsigned char canmodify;
#if IS_DEBUG
const char *lockfile;
const char *lockthread;