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Kernel+LibC+LibCore+UserspaceEmulator: Implement faccessat(2)

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Co-Authored-By: Daniel Bertalan <dani@danielbertalan.dev>
This commit is contained in:
sin-ack 2022-10-01 12:24:56 +00:00 • committed by Andrew Kaster
parent fa692e13f9
commit 2a502fe232
13 changed files with 89 additions and 39 deletions
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12
Kernel/FileSystem/VirtualFileSystem.cpp
View file

@ -523,24 +523,26 @@ ErrorOr<void> VirtualFileSystem::mkdir(Credentials const& credentials, StringVie
return {};
}
ErrorOr<void> VirtualFileSystem::access(Credentials const& credentials, StringView path, int mode, Custody& base)
ErrorOr<void> VirtualFileSystem::access(Credentials const& credentials, StringView path, int mode, Custody& base, AccessFlags access_flags)
{
auto custody = TRY(resolve_path(credentials, path, base));
auto should_follow_symlinks = !has_flag(access_flags, AccessFlags::DoNotFollowSymlinks);
auto custody = TRY(resolve_path(credentials, path, base, nullptr, should_follow_symlinks ? 0 : O_NOFOLLOW_NOERROR));
auto& inode = custody->inode();
auto metadata = inode.metadata();
auto use_effective_ids = has_flag(access_flags, AccessFlags::EffectiveAccess) ? UseEffectiveIDs::Yes : UseEffectiveIDs::No;
if (mode & R_OK) {
if (!metadata.may_read(credentials, UseEffectiveIDs::No))
if (!metadata.may_read(credentials, use_effective_ids))
return EACCES;
}
if (mode & W_OK) {
if (!metadata.may_write(credentials, UseEffectiveIDs::No))
if (!metadata.may_write(credentials, use_effective_ids))
return EACCES;
if (custody->is_readonly())
return EROFS;
}
if (mode & X_OK) {
if (!metadata.may_execute(credentials, UseEffectiveIDs::No))
if (!metadata.may_execute(credentials, use_effective_ids))
return EACCES;
}
return {};

10
Kernel/FileSystem/VirtualFileSystem.h
View file

@ -34,6 +34,14 @@ struct UidAndGid {
GroupID gid;
};
enum class AccessFlags {
None = 0,
EffectiveAccess = 1 << 0,
DoNotFollowSymlinks = 1 << 1,
};
AK_ENUM_BITWISE_OPERATORS(AccessFlags);
class VirtualFileSystem {
public:
// Required to be at least 8 by POSIX
@ -63,7 +71,7 @@ public:
ErrorOr<void> chmod(Credentials const&, Custody&, mode_t);
ErrorOr<void> chown(Credentials const&, StringView path, UserID, GroupID, Custody& base, int options);
ErrorOr<void> chown(Credentials const&, Custody&, UserID, GroupID);
ErrorOr<void> access(Credentials const&, StringView path, int mode, Custody& base);
ErrorOr<void> access(Credentials const&, StringView path, int mode, Custody& base, AccessFlags);
ErrorOr<InodeMetadata> lookup_metadata(Credentials const&, StringView path, Custody& base, int options = 0);
ErrorOr<void> utime(Credentials const&, StringView path, Custody& base, time_t atime, time_t mtime);
ErrorOr<void> utimensat(Credentials const&, StringView path, Custody& base, timespec const& atime, timespec const& mtime, int options = 0);